Journal of Biogeography (J. Biogeogr.) (2006) 33, 1266–1278
ORIGINAL
ARTICLE
Areas of endemism and distribution
patterns for Neotropical Piper species
(Piperaceae)
Mario Alberto Quijano-Abril1, Ricardo Callejas-Posada2* and Daniel Rafael
Miranda-Esquivel1
1
Laboratorio de Sistemática y Biogeografı́a,
Escuela de Biologı́a, Universidad Industrial de
Santander, Bucaramanga, Colombia and
2
Facultad de Ciencias Exactas y Naturales,
Instituto de Biologı́a, Universidad de
Antioquia, Medellı́n, Colombia
ABSTRACT
Aim The study aimed to establish areas of endemism and distribution patterns
for Neotropical species of the genus Piper in the Neotropical and Andean regions
by means of parsimony analysis of endemicity (PAE) and track-compatibility
analysis.
Location The study area includes the Neotropical region and the Northern
Andean region (Páramo-Punan subregion).
Methods We used distribution information from herbarium specimens and
recent monographic revisions for 1152 species of Piper from the Neotropics. First,
a PAE was attempted in order to delimit the areas of endemism. Second, we
performed a track-compatibility analysis to establish distribution patterns for
Neotropical species of Piper. Terminology for grouping Piper is based on recent
phylogenetic analyses.
Results The PAE yielded 104 small endemic areas for the genus Piper, 80 of
which are in the Caribbean, Amazonian and Paranensis subregions of the
Neotropical region, and 24 in the Páramo-Punan subregion of the Andean region.
Track-compatibility analysis revealed 26 generalized tracks, one in the PáramoPunan subregion (Andean region), 19 in the Neotropical region, and six
connecting the Andean and Neotropical regions. Both the generalized tracks and
endemic areas indicate that distribution of Piper species is restricted to forest
areas in the Andes, Amazonia, Chocó, Central America, the Guayana Shield and
the Brazilian Atlantic coast.
*Correspondence: Ricardo Callejas-Posada,
Facultad de Ciencias Exactas y Naturales,
Instituto de Biologı́a, Universidad de Antioquia,
Apartado postal 1226, Medellı́n, Colombia.
E-mail: callejas@matematicas.udea.edu.co
Main conclusions Piper should not be considered an Andean-centred group as
it represents two large species components with distributions centred in the
Amazonian and Andean regions. Furthermore, areas of greater species richness
and/or endemism are restricted to lowland habitats belonging to the Neotropical
region. The distribution patterns of Neotropical species of Piper could be
explained by recent events in the Neotropical region, as is the case for the track
connecting Chocó and Central America, where most of the species rich groups of
the genus are found. Two kinds of event could explain the biogeography of a large
part of the Piper taxa with Andean–Amazonian distribution: pre-Andean and
post-Andean events.
Keywords
Andean region, biogeography, distribution patterns, Neotropical region, parsimony analysis of endemicity, Piper clades, track analysis.
INTRODUCTION
Piper (Piperaceae) is a Pantropical group with nearly 2000
species, constituting an important element of montane and
lowland forests. It is one of the 10 most speciose genera of basal
Angiosperms found in the tropics (Gentry & Dodson, 1987).
Most species of Piper appear to be restricted to altitudes ranging
from 0 to 2500 m, and few occur above 3000 m. According to
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Journal compilation ª 2006 Blackwell Publishing Ltd
Distribution of Neotropical Piper
Gentry (1990), Piper reaches its highest diversity in the lowlands
of the Neotropical region. Here, most species have restricted
distributions, and it is quite common to find numerous related
endemic taxa occurring in small areas (Callejas, 1986). There is
also a relatively small number of species with wide distributions.
The Andean slopes, the Central American lowlands and Central
Amazonia have been considered as centres of high species
richness for Piper in the Neotropics (Callejas, 1986; Soltis et al.,
1999; Jaramillo & Manos, 2001).
A recent phylogenetic analysis for the genus suggests three
major clades in Piper (Jaramillo & Manos, 2001), representing
three large geographical regions: America (1300 sp.), Asia (600
sp.) and the South Pacific (100 sp.). Recent updates in Piper
taxonomy and phylogeny, and the fact that the genus Piper in
the Neotropics exhibits a wide distribution throughout most of
the region, allow a new analysis of the group with regard to the
history of the biota that shaped the Neotropical region.
Studies on the global distribution of Piper and its relationship
to other genera in the Piperaceae were first conducted by Miquel
(1844). Later, Trelease (1930) briefly summarized the geography
of American pipers and indicated the distribution and abundance of major groups of the genus and related genera. He
concluded that the origin of Piperaceae is rather obscure and
that, according to fossil data, the group might have its origins in
the Quaternary period. Raven & Axelrod (1974) suggested a
Laurasian origin for the group, while Gentry (1982) and Graham
(1995) proposed a Gondwanan origin, emphasizing that the
genus was already established in South America by the
Cretaceous period and extended into Central America via
Panama. Callejas (1986), in his taxonomic revision of the
subgenus Ottonia, analysed the distribution of the entire group
and showed that Ottonia distribution patterns were related to
‘Pleistocene refugia and isolated dispersal events’. Recently, a
phylogenetic analysis by Jaramillo & Manos (2001) suggested
that the presence of the genus in the Southern Hemisphere was a
result of vicariance rather than dispersal.
The distribution patterns of Piper have not been studied in
detail due to inadequate and often scarce sampling of some
areas (e.g. Northern Andean region of Colombia, southern
Guayana Shield, eastern Colombian Amazon, southern Bolivian Amazon) and to poor species descriptions. Therefore it
was not known how each clade was distributed, and what the
most important areas were in terms of endemism and for
species richness.
The first step in a modern biogeographical study is
delimitation of the study units or comparison areas (Nelson
& Platnick, 1981). Morrone (1994) proposed that parsimony
analysis of endemicity (PAE) (Rosen, 1988) may be used to
identify areas of endemism. Using Morrone’s (1994) gridbased PAE approach, the congruence between distribution
patterns of many different taxa can be optimized by employing
quadrants of arbitrary size as operative units in relation to the
prospective degree of resolution.
Our viewpoint is that the results obtained by using gridbased PAE do not allow us to distinguish the origin of spatial
congruence among taxa, that is, these results fail to uncover the
extent of both historical and ecological influences (Posadas &
Miranda-Esquivel, 1999; Brooks & Van Veller, 2003). When
using PAE, we focus strictly on the demarcation of endemic
areas, which accounts for the lack of an ‘area cladogram’
(which would assume historical or ecological relationships
based on the distribution of the Piper species) in our results.
An area of endemism is therefore defined as the area where the
distribution patterns of at least two taxa overlap. These taxa
may or may not be related phylogenetically.
Due to the large number of Piper species, and the lack of
taxonomic resolution for some groups to date, it has been
impossible to carry out a reliable and detailed analysis of current
Piper distributions in order to postulate a hypothesis for their
current distribution pattern in the Neotropical region. We used
a panbiogeographical analysis as a first step to find distribution
patterns that allow primary biogeographical homologies to be
established, recognizing groups of organisms with currently
disjunct distributions. These particular distributions might be
part of one biota now fragmented by events of climatic or
tectonic change (Craw, 1988; Craw et al., 1999; Morrone, 2001).
Several authors have already recognized two stages in the
proposition of homologies in systematics (Nelson, 1994),
denominated ‘primary’ and ‘secondary’ homologies (de Pinna,
1991). Primary homology refers to the stage of hypothesis
generation; secondary homology to the stage of evaluation. A
primary homology statement is conjectural, reflecting an
expectation of correspondence between parts of different
organisms (in morphological characteristics, topological correspondence is the basic criterion of primary homology).
Primary biogeographical homology refers to a common
biogeographical history, which means that different taxa are
spatio-temporally integrated into a single biota (Craw, 1988;
Craw et al., 1999; Morrone, 2001).
A panbiogeographical analysis allows comparison of individual tracks in order to detect generalized tracks (Craw et al.,
1999), and emphasizes the importance of spatial information,
locality and position in life history as relevant factors for any
evolutionary analysis (Craw, 1988; Craw et al., 1999; Morrone,
2001). To improve our panbiogeographical analysis, we
compiled a database of the largest available number of
distribution records for the genus, covering 90% of Neotropical Piper species for which the taxonomy was carefully checked.
We used PAE and the panbiogeographical approach as two
independent methods with two different purposes. The results of
these analyses are complementary when analysing the distributions of Neotropical Piper, as both represent tools to postulate a
hypothesis of primary biogeographical homology (Morrone,
2001); nonetheless, each employs a distinct method of data
analysis.
MATERIALS AND METHODS
Study area
In this study we employed the biogeographical province scheme
of Morrone (2002), based on the analysis of distribution
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M. A. Quijano-Abril, R. Callejas-Posada and D. R. Miranda-Esquivel
patterns of different taxa (fauna and flora). This allowed us to
apply the primary biogeographical homology concept when
establishing ‘natural biogeographical areas’, defined as areas
supported by shared endemic species (Morrone, 2002). The
study areas used in the analysis were the Neotropical region and
the Páramo-Punan subregion belonging to the Andean region.
The Neotropical region extends into the tropics from the north
of Mexico to the centre of Argentina, and belongs to the
Holotropical Kingdom. The Neotropical region is made up of
the Caribbean, Amazonian, Chocoan and Paraná subregions.
The Andean region belongs to the Austral Kingdom, and
includes the Páramo-Punan, Central Chilean, Subantarctic and
Patagonian subregions. The Andean area, where Piper is present,
is part of the Páramo-Punan subregion, which extends from the
Northern Cordilleras of Venezuela to Colombia, Ecuador and
along the Puna of Perú and Bolivia.
Taxa
Despite the lack of a formal classification scheme for Piper, we
opted to follow the cladistic analysis of Jaramillo & Manos
(2001). In this study, a single unrooted parsimony network
suggested that taxa representing major geographical areas
could potentially form three monophyletic groups: Asia, the
South Pacific and the Neotropics. Most clade names
recognized by Jaramillo & Manos (2001) correspond to formal
groups at generic or subgeneric levels previously identified by
other authors, particularly Miquel (1844) and de Candolle
(1923). Our sampling is more extensive than that of Jaramillo
& Manos, as we include groupings not covered by them. Thus
we include species belonging to Peltobryon (a clade of the
Schilleria group); Isophyllon (a group first recognized by
Miquel and belonging to Schilleria); and the Carpunya group.
Following Jaramillo & Callejas (2004), the Trianaeopiper group
was split into three distinct clades, named temporarily as
Trianaeopiper-trianae, Trianaeopiper-filistylum and Trianaeopiper-confertinodum groups.
We mapped the distributions of 1152 species of Piper. Our
primary sources came from the collection housed at the
Herbario Universidad de Antioquia, which has the most
complete holdings of Neotropical pipers, as well as specimens
stored at the Botanical Institute of the Aarhus University
(Denmark); Herbario Nacional Colombiano (Colombia);
Herbario del Instituto Nacional de Biodiversidad (Costa Rica);
Herbarium of the University of Texas (USA); Missouri
Botanical Garden (USA); National Herbarium of the Netherlands (Netherlands); New York Botanical Garden (USA); and
the United States National Herbarium (USA). As secondary
sources, we employed the latest and most up-to-date taxonomic treatments of Piper for specific geographical areas
(Yuncker, 1972, 1973; Steyermark, 1984; Callejas, 1986, 1999;
Steyermark & Callejas, 2003) and revisions of specific clades
(Burger, 1971; Callejas, 1986; Bornstein, 1989; Tebbs, 1993).
Sampling of Piper in the Neotropics has not been uniform
across the region (many species are only found in single
locations). We attempted to assemble the most complete data
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base possible for Neotropical species, including almost 90% of
all Neotropical species and 7500 records for the genus.
Parsimony analysis of endemicity
Once taxa had been chosen and their taxonomy carefully
checked, we proceeded to perform a PAE analysis (Morrone,
1994) using a sectoral search as well as a tree-drifting/tree-fusing
strategy. For this analysis, we chose the relatively coarse 1°
latitude, 1° longitude grid size, partly for the sake of data
manipulation and partly to reduce the effects of sampling
artefacts such as mapping errors and unsampled grids in
sparsely inhabited areas (Crisp et al., 2001; Morrone &
Escalante, 2002). It is known that patterns of endemism are
scale-dependent (Major, 1988; Anderson, 1994; Ruggiero &
Lawton, 1998; Vilkenkin & Chikatunov, 1998; Crisp et al.,
2001). For this reason, it is important to clarify that the size of
the square is totally operational. The size used in this study was
chosen as a compromise between resolution and computational
effort. Therefore an analysis using a different scale, with a higher
number of records placed in a larger number of areas, could
incorporate more functional square sizes than those used here.
All quadrants were numbered and a presence/absence matrix
was constructed. A hypothetical taxon with 0 for all species (all
species absent in that grid) was added to root the resulting tree
(Morrone, 1994; Morrone & Crisci, 1995; Posadas & MirandaEsquivel, 1999). A parsimony analysis was carried out using
tnt ver. 1.0 (Goloboff et al., 2004).
The trees were examined with winclada 1.0 (Nixon, 2002).
Groups of quadrants sharing at least two species were
considered to represent an area of endemism (Platnick, 1991;
Morrone, 1994). As the results consisted of multiple equally
parsimonious solutions, these were summarized using strict
consensus. Subsequently, the endemic areas were delineated
and mapped.
Track analysis
The matrix used in the PAE analysis was subjected to a
compatibility analysis (Craw, 1988, 1989) applying the same
search as used for PAE. The cliques were examined using
winclada 1.0 (Nixon, 2002). The generalized tracks were
detected and mapped according to the species distributions. In
the resulting cliques, we searched for groups of species that
supported particular generalized tracks. Each supporting
species was revised to determine the group to which it
belonged according to those proposed by de Candolle (1923),
Callejas (1986), Bornstein (1989) and Jaramillo & Manos
(2001).
RESULTS
A total of 661 quadrants out of 2000 were occupied by two
or more species. Piper is found in almost all available
habitats within its range. In the Neotropical region, two
subregions contained areas with the highest species richness:
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Distribution of Neotropical Piper
the Caribbean subregion in the provinces of Western
Panamanian Isthmus (408 spp.), Chocó (378 spp.) and
Eastern Central America (87 spp.); and the Amazonian
subregion in the provinces of Ucayalı́ (116 spp.) and Napo
(69 spp.). In the Andean Region, the subregion with the
highest number of species was the Páramo Punan in the
provinces of Norandean Páramo and Puna (291 and
115 species, respectively).
The PAE analysis revealed 104 endemic areas (Fig. 1). It is
interesting to observe that, since most of the species analysed
exhibited a distribution restricted to specific areas such as
Central America, the Andes and the Amazon, generalized
tracks of great length were not established in the study area. A
total of 24 (23.07%) areas correspond to the Andean region,
distributed in the Páramo-Punan subregion: 16 areas in the
provinces of Norandean Páramo and eight in Puna. In
contrast, there are 80 (76.91%) areas corresponding to the
Neotropical region: 48 distributed in the Caribbean, 28 in the
Amazon and four in the Paranaense subregion (Table 1).
Eighty per cent of the endemic areas and of the generalized
tracks are present in the subregions with the highest number of
species per grid, while the remaining 20% of the endemic areas
and tracks occur in zones with a small number of species (the
Antilles, the Guayana shield and Manaus).
Twenty-six generalized tracks were obtained in the panbiogeographical analysis (Fig. 2). One generalized track was
located in the Andean region, and 19 were restricted to the
Neotropical region. Of these tracks, six were distributed in the
Caribbean, 12 in the Amazon and one in the Paraná
subregions. Finally, we found six generalized tracks that
connect the Andean and Neotropical regions (Table 2).
Of the 1152 species examined, only 327 were informative.
These species belong to the clades Churumayu (five spp.), Enckea
(five spp.), Isophyllon (15 spp.), Macrostachys (45 spp.), Ottonia
(five spp.), Peltobryon (63 spp.), Radula (127 spp.) and Schilleria
(18 spp.). Three clades without formal ranking, and previously
placed in the non-natural genus Trianaeopiper (polyphyletic
according to Jaramillo & Manos, 2001; Jaramillo & Callejas,
2004), were informative and supported generalized tracks.
DISCUSSION
Endemic areas
Caribbean subregion, Magdalena and Chocó provinces
Our data indicate that Piper displays the highest number of
species in the Neotropical region. This region, which presents 80
endemic areas as revealed by the endemicity analysis, accounts
for 77.44% of the endemic taxa. The Andean region exhibits a
comparatively low level of endemism, with only 24 endemic
areas, which represent 22.56% of the endemic species (Table 1).
In the province of Magdalena, only one area of endemism
was detected, in the Sierra Nevada de Santa Marta (Fig. 1), a
massif located in the north of Colombia and isolated from the
Andean region (Harrington, 1962; Alemán & Ramos, 2000).
This area is home to nearly 50 species of Piper (Trelease &
Yuncker, 1950), four of them endemic and the remainder
mostly widespread taxa that are distributed in the Caribbean
region, the Northern Andes or the Antilles.
The endemic areas with the highest number of known Piper
species in the Neotropics were encountered in the very humid
forests of the Chocó and Costa Rica provinces. Piper is not the
only group that exhibits such a pattern; it is also seen in the
family Ericaceae (Luteyn, 2002) and in the genus Anthurium
(Araceae) (Croat, 1992). These results are congruent with the
analysis of Marquis (2004), who found a high correlation
between the number of species of Piper and annual precipitation in some Central American areas. We agree with the
overall conclusion of Gentry (1982) that forested areas in
lowland regions of the Neotropics with high precipitation hold
the largest number of endemics for herbaceous genera.
Although the Colombian Pacific slope area of the Chocó
province is characterized by high rainfall, this region should
not be considered an independent unit distinct from the
neighbouring forests (Croizat, 1976; Gentry, 1982). Our track
analysis supports the idea that the Chocó ‘province’ is rather a
confluence area among different biogeographical elements,
showing marked affinities with the lowland forests of Central
America and the western slopes of the Western Cordillera.
It should be clarified that the western slopes of the Western
Cordillera (up to 1000 m altitude) are not included in the
Andean region; instead, they are an extension of the lowland
biota of the Chocó and Cauca provinces. A mixed zone was
delimited among these biotas, with species groups that occur
within an altitudinal gradient between 0 and 1000 m.
Provinces of Chiapas, Eastern Central America and Western
Panama
In the Neotropical region, the Caribbean subregion exhibits a
great number of species of Piper and high levels of endemism
for the Central American provinces of Chiapas, Eastern Central
America (Costa Rica and Nicaragua) and the Western
Panamanian Isthmus. With respect to the province of the
Western Panamanian Isthmus, the lowland areas of Limón in
Costa Rica and the Zelaya department of Nicaragua are well
known for their high levels of endemism. Such differences are
unlikely to be missed due to lack of sampling, since both
provinces include areas with a long, continuous history of
intensive collecting (Croat, 1997; Hammel et al., 2003). The
province of Western Panama shows a large number of species,
but low endemism due to the fact that many species in the
province cross over to the neighbouring areas of northern
Chocó, or extend into southern Costa Rica. Despite the fact
that Chiapas is an endemic area for Piper, it presents a small
number of species. Some 80% of the endemic species belong to
subgenus Arctottonia, a clade of Piper almost entirely restricted
to Mesoamerica (Bornstein, 1989). This province has been
previously recognized as an endemic area for various plant and
animal taxa (Croizat, 1976; Halffter, 1978, 1987; Morrone,
1999; Luna-Vega et al., 2001).
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M. A. Quijano-Abril, R. Callejas-Posada and D. R. Miranda-Esquivel
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
Figure 1 Endemic areas (104) delimited by
parsimony analysis of endemicity (PAE) for
the genus Piper in the Neotropics. The analysis using PAE is based on distribution data
extracted from 7500 records (1152 species).
Of the total species examined, 718 were
endemic. The levels of saturation (increasing
darkness) follow the scale: (2–10 endemic
species), (10–20 endemic species) and (21–30
endemic species). (a–d) Endemism areas for
Central America and the Caribbean, with the
areas exhibiting the highest number of
endemics located in: (a) Guatemala and
north-eastern Nicaragua (prov. Chiapas);
(b) north-eastern Panamá and Darien (prov.
Chocó); (c) western Costa Rica (prov.
Western Panamanian isthmus); (d) northern
Panamá (prov. Eastern-Central America).
(e–h) Endemism areas for South America,
with areas exhibiting the highest number of
endemics, located in: (e,f) north-western
Colombia (prov. Cauca); (g) north-western
Ecuador (prov. Chocó); north-eastern Ecuador (prov. Napo); southern Perú (prov.
Puna); (h) northern Ecuador (prov. Norandean páramo) and north-eastern Perú (prov.
Napo). (i) Endemism areas for western South
America in Guianas (prov. humid Guyana)
and south-eastern Brazil (prov. Brazilian
Atlantic forest). Biogeographical scheme for
Latin America and the Caribbean follows
Morrone (2002).
(i)
Provinces of Antilles, Guayana Shield and the Atlantic forest
of Brazil
Despite the low species count (Table 1) for the provinces of
Chiapas, the Mexican Pacific coast, the Venezuelan coast,
Cuba, arid Ecuador, the Mexican Gulf, Hispaniola, Magdalena,
western Ecuador, Amapá, Imeri, Roraima, Ucayali, Antilles,
Guayana Shield and the Atlantic forest of Brazil, the species
here make up 15% of all endemic species. This figure indicates
that areas can still have a high proportion of flora with
restricted distribution ranges, despite species richness not
being high (Crisp et al., 2001).
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There are relatively few species of Piper with Guayanan
distribution, but three endemic areas were detected, two
in Venezuela (in the states of Amazonas and Bolivar)
and the third in Saramacca (Surinam). This is congruent
with previous observations that such areas tend to have
high values of endemism but low species richness (Steyermark, 1966, 1974, 1979, 1984; Maguire, 1970, 1979; Huber,
1988, 1990, 1992; Brako & Zarucchi, 1993; Cortés, 1996). It
is likely that the extreme habitats often found in such
areas, including rocky outcrops, dry forests, savannas, etc.,
tend to exclude most species of Piper which, in general,
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Distribution of Neotropical Piper
Table 1 Summary of the results obtained by PAE
Region
Subregion
Province
Andean Region
Páramo Punan
Neotropical
Region
Caribbean
Norandean Páramo
Puna
Cauca
Chiapas
Chocó
Mexican Pacific Coast
Venezuelan Coast
Cuba
Arid Ecuador
Mexican Gulf
Hispaniola
Magdalena
Western Ecuador
Western Panamanian Isthmus
Eastern Central America
Amapá
Guyana
Humid Guyana
Imeri
Madeira
Napo
Roraima
Ucayali
Brazilian Atlantic Forest
Parana Forest
Amazonian
Paraná
Number
of endemic
areas
16
8
4
2
13
3
2
1
2
2
3
2
1
5
8
1
4
2
3
1
15
1
1
3
1
Percentage of
endemic areas
for subregion
23.07
46.15
26.92
3.84
Number
of species
75
87
32
10
72
13
6
2
5
8
13
7
2
52
159
2
11
5
8
2
127
2
3
10
5
Number
of species
for subregion
Percentage of
endemic species
for subregion
162
22.56
381
53.08
160
22.28
15
2.08
Endemic areas for the genus Piper in the Neotropics obtained by parsimony analysis of endemicity. Areas are listed according to the biogeographical
scheme for Latin America and the Caribbean proposed by Morrone (2002).
display a preference for humid and shady places (Marquis,
2004).
The Atlantic forest of Brazil, a belt of tropical rain forests
along the coast of Brazil, has few species of Piper, comparable
to the Antilles and the Guyana Shield, which is interesting if
one considers the type of vegetation found in that area. It is
well known that the area is home to a biota with a large
endemic component, exhibiting close relationships with the
Amazonian biota (Amorim, 2001; da Silva et al., 2004). In the
case of Piper, the Atlantic forests hold a lower number of taxa
than the Amazon, but the Atlantic forests include all
Neotropical clades of Piper (except Arctottonia and Trianaeopiper). For this reason, the Atlantic forest has a high
phylogenetic information content.
Páramo-Punan Subregion, Norandean Páramo and Puna
provinces
In the Andean region, the PAE analysis detected 24 endemic
areas, 16 in the Páramo province and eight in the Puna
province. In the Páramo province, six endemic areas are
restricted to the North-eastern Cordillera of Colombia and to
the neighbouring Andean zone in Venezuela, including two
areas along the slopes of the Eastern Cordillera towards the
Magdalena Valley. The latter is an area with a high number of
species in many groups of angiosperms, and close affinities
with Amazonia (Croizat, 1976; Gentry, 1982, 1990; Gentry &
Dodson, 1987). Two endemic areas were found, one in the
Northern Central Cordillera in Antioquia, the other in the
Central Andean region of the neighbouring departments of
Tolima, Quindio and Caldas. Another two areas were located
in the south of Colombia in the Central-Eastern Cordillera
massif. In Ecuador the endemic areas are restricted to the
Northern Andean zone, one close to the Colombian Massif in
the state of Carchi, and the other two located on the eastern
slopes, facing the Amazon, in the departments of Chimborazo
and Morona-Santiago.
The eight endemic areas found in the Puna province are all
restricted to Peru (provinces of Junı́n and Huánuco). They
show 20 or more species per grid, richness values that are also
evident for some plant groups in this province (Brako &
Zarucchi, 1993).
The distribution patterns of Piper in the provinces of
Norandean Páramo and Puna are congruent with the proposal
of a transition area (Ruggiero & Ezcurra, 2003), which has
been labelled by Morrone (2004) as ‘The South American
Transition Zone’. In these areas it was possible to identify
distribution patterns in which some Neotropical Piper species
presented distributions outside the Neotropical region. Similarly, some species of Andean Piper showed an extended
distribution outside the limits demarcated by the Cordillera, as
is the case of the western slopes of the Western Cordillera in
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M. A. Quijano-Abril, R. Callejas-Posada and D. R. Miranda-Esquivel
(a)
(b)
(c)
Figure 2 Generalized tracks for the Neotropical species of the
genus Piper. Twenty-six tracks obtained in the panbiogeographical
analysis are shown (a–c). One single track (track 1) is located in
the Andean region; 19 tracks in the neotropical region (tracks 4, 6–
8, 10, 12–15, 17, 19–25, 27, 28); and six tracks in the AndeanNeotropical regions (2, 5, 9, 16, 18, 26) (tracks connecting both
regions). Biogeographical provinces scheme follows Morrone
(2002).
Colombia and Ecuador. More than one static line among the
Neotropical and Andean regions or ‘Subtropical Line’ (Rapoport, 1968), the transition zone, could be an area where
historical and ecological processes have allowed the evolution
of a mixed biota. As the ‘Subtropical Line’ could vary
according to the taxa analysed, we follow Morrone’s (2004)
proposal of the recognition of a wider transition area.
Generalized tracks
The distribution patterns of Piper were congruent with several
panbiogeographical analyses of the Neotropical region (Cortés
& Franco, 1997; Contreras-Medina & Eliosa-Leon, 2001; LunaVega et al., 2001). For instance, studies by Franco & Berg
(1997) for the genus Cecropia revealed, among other aspects,
generalized tracks in the slopes of the Northern Andean region
of Colombia, Central America and the Atlantic forests of
1272
south-eastern Brazil, all of which were also detected in our
analysis. The coincidence in the distribution patterns established by the generalized tracks for these two genera could
indicate that the current distributions of the species of these
genera were influenced by shared vicariant events. This can be
seen readily in areas such as southern Central America
(Panama and Costa Rica), the slopes of the Andean region
(Colombia, Ecuador, and Peru), the Guayana Shield (Guianas), Chocó (Colombia, Ecuador), and the Atlantic forest of
Brazil (Rio de Janeiro and São Paulo), which in our analysis
were areas of distributional congruence and high endemism.
Moreover, there seems to be a close agreement between our
analysis and those using plants and animals to determine the
nature of the Mexican Biota (Halffter, 1964; Rzedowski, 1978,
1991; Fa & Morales, 1998; Contreras-Medina & Eliosa-Leon,
2001; Morrone & Marquez, 2003). Our results include a
generalized track that relates Central and South America,
crossing the provinces of the Mexican Pacific Coast, the
Mexican Gulf, the eastern region of Central America, the
western Panamanian Isthmus, Magdalena, Cauca and Norandean Páramo. This track underlies a pattern first proposed by
Gentry (1982), which connected the floras of the lowland forests
of Central America with those of northern South America.
The Neotropical region hosts the largest concentration of
generalized tracks, corresponding to 73.07% of the total
(Table 2). The presence of four tracks along the Chocó
province is notable, suggesting a mixture of elements representing an apparently uniform biota (Fig. 2). One track
extends from Darien province in Panama along the northern
Pacific coast of Chocó, which includes sister taxa occurring on
both sides of Darién Province and restricted to northern
Colombia. A second track goes from the north-western slopes
of the Western Cordillera in Colombia (Antioquia), to
southern Calima, on the southern Pacific coast of the Chocó
lowlands. This track includes taxa of Piper with restricted
distributions in Chocó and affinities with Andean elements in
northern Colombia. A third track, from southern Calima to
the western slopes of the Western Cordillera, is supported by
several endemic taxa with sister species in northern Chocó or
neighbouring Andean slopes of the Western Cordillera in
Colombia. Finally, there is a fourth track, extending from the
northern Pacific coast of Chocó in Colombia to the province of
Pichincha in Ecuador, which comprises a widespread presence
of all Piper species with strong affinities for the Andean slopes
of Ecuador and Colombia. Thus, based on the sampling of
Piper for Chocó, we believe that the area should be considered
not as a single unit, but rather as a compound biota with
distinctive elements between north and south, bounded at
Calima along the Pacific coast. Croat (1992) has detected
similar discontinuous distributions in Chocó for Anthurium
(Araceae).
The generalized tracks found in this study provide evidence
for the composite nature of the Andean biota (Crisci et al.,
1991; Amorim & Tozoni, 1994; Katinas et al., 1999). Three
types of biogeographical pattern involving the Andean region
are seen in Neotropical pipers. Firstly, there are areas in the
Journal of Biogeography 33, 1266–1278
ª 2006 The Authors. Journal compilation ª 2006 Blackwell Publishing Ltd
Distribution of Neotropical Piper
Table 2 Generalized tracks with their respective supporting species
Region
Subregion
Province
Number of
generalized
tracks for
subregion
Andean
Páramo
Punan
Puna
1
1
Neotropical
Caribbean
Mexican Pacific Coast
Venezuelan Coast
6
19
15
Amazonian
Track
code
Eastern Central
America
10
Mexican Pacific Coast,
Eastern Central America,
Western Panamanian
Isthmus
14
Chocó, Eastern
Central America
21
Western Panamanian
Isthmus, Mexican Gulf,
Eastern Central America
27
Guyana
12
12
Humid Guyana
20
8
Imerı́
4
Napo
6
Pantanal
Imeri
Imeri, Napo
Imeri, Napo
Imeri, Pantanal, Amapá
Amapá, Roraima
17
7
13
23
22
24
Journal of Biogeography 33, 1266–1278
ª 2006 The Authors. Journal compilation ª 2006 Blackwell Publishing Ltd
Species support
Piper carrapanum, P. brevestrigillosum, P. brevipedunculum, P. cispontinum, P. edurumglaberimicaule,
P. huantanum, P. perenense, P. planipes, P. pontis,
P. scabricaule, P. serotinum, P. sidipilum, P. tardum
Piper brachypus, P. cihuatlanense, P. mcvaughii
Piper schlimii, P. cumbotianum, P. nobile, P. marturense,
P. sierra-aroense
Piper canaliculum, P. acutissimum, P. alstonii,
P. amphibium, P. barbinerve, P. breve, P. cativalense,
P. chagresianum, P. culebranum, P. diazanum,
P. frijolesanum-grandifolium, P. gatunense,
P. gonocarpum, P. humorigaudens, P. luciguadens,
P. minute-scabiosum, P. non-retrorsum, P. panamense,
P. persubulatum, P. portobellense, P. pseudocativalense,
P. salamancanum, P. tabernillanum, P. tapianum,
P. tecumense
Piper affectans, P. agellifolium, P. altevaginans, P. amphoricarpum, P. arcte-acuminatum, P. barbirostre,
P. biauritum, P. biseriatum, P. callibracteum, P. carminis,
P. carpinteranum, P. casitense, P. chiriquinum, P. ciliatifolium, P. coronatibracteum, P. corrugatum, P. davidianum, P. davidsonii, P. fluvii-initii, P. fortunaensis,
P. fusco-granulatum, P. glabrescens, P. goergeri, P. jubatum, P. magnilimbum, P. subfuscum
Piper daguanum, P. gamboanum-yapense, P. latibracteum,
P. laxispicum, P. magnantherum, P. obaldianum,
P. pallidibracteum, P. pervenosum, P. pinoganense,
P. polyneurum, P. pseudohodgei, P. pseudoviridicaule,
P. sambuanum, P. scabrilimbum, P. sperdinum,
P. subcaudatum, P. turbense, P. viridicaule
Piper barbulatum, P. donnell-smithi, P. flavidum,
P. lanosibracteum, P. leptoneuron, P. luxii,
P. matinanum, P. santa-rosanum, P. subcitrifolium,
P. uspantanense, P. variabile
Piper bolivarianum, P. sabanaense, P. tamayoanum,
P. kegelianum, P. cernuum-perlongispicum, P. venamoense, P. hippocrepiforme, P. politii-toronoense
Piper schwackei, P. substilosum, P. glandulosissimum
Piper nematanthera, P. gleasonii, P. paramaribense,
P. poiteanum, P. regelianum, P. adenandrum,
P. regelii, P. romboutsii, P. rudgeanum, P. insigne,
P. saramaccanum, P. pulleanum
Piper perciliatum, P. javitense, P. cililimbum,
P. pubivaginatum, P. liesneri, P. mosaicum
Piper corpuientispicum, P. calanyanum, P. florencianum,
P. peculiare, P. statum, P. sucreense, P. purulentum
Piper moense, P. udisilvestre
Piper otto-huberi, P. para-peltobryumbryon
Piper japurence, P. maranyonense
Piper froesii, P. silvigaudens, P. uapesense
Piper purusanum, P. coariense, P. limosum, P. subcostatum
Piper carniconectivum, P. gurupanum, P. rupunianum,
P. striatipetiolum, P. subglabrifolium
1273
M. A. Quijano-Abril, R. Callejas-Posada and D. R. Miranda-Esquivel
Table 2 continued
Region
Subregion
Province
Number of
generalized
tracks for Track
subregion code
Madeira, Pantanal
Parana
AndeanNeotro
Brazilian
Atlantic
Forest
Paramo
Punan,
Caribbean
North Andean Páramo,
Cauca, Chocó,
Arid Ecuador, Western
Ecuador
North Andean Páramo,
Venezuelan Llanos
North Andean Páramo,
Chocó
Paramo
Punan,
Amazonian
1274
28
1
25
6
9
2
5
North Andean Páramo,
Chocó, Cauca
16
North Andean Páramo,
Eastern Central
America,
Western Panamanian
Isthmus, Mexican
Pacific Coast,
Magdalena, Cauca
18
Puna, Pantanal,
Napo, Ucayali
26
Species support
Piper brachypetiolatum,
P. madeiranum,
P. tridentiphilum
Piper hayneanum,
P. permucronatum,
P. guimaraesianum
Piper regale, P. bullosum, P. filistylum, P. killipii, P. pubestilis, P. bellowi, P. villosum, P. anisatum, P. peñasblancas,
P. ambiguum, P. acaule, P. obovatilimbum, P. altaqueriano, P. barbacoense, P. alejandrinum, P. cyphophyllopse,
P. cyphophyllopse-brevipes, P. debilicaule, P. entradense,
P. ignacioanum, P. parcum, P. poscitum, P. supernum,
P. townsendii, P. mexiae, P. catripense, P madisonii,
P. cangapianum, P. arobense, P. tobarensis
Piper deliciasanum, P. viridistachyum, P. pendentispicium
Piper pseudoshupii, P. montanum, P. aguadulcense,
P. veneralense, P. golondrinum, P. alwini,
P. foreroi
Piper atrobaccum, P. bahiasolano, P. barklegi,
P. basilobatum, P. blanquita, P. bolivar,
P. brachypodon, P. caudefactum, P. certeguiense,
P. condotoense, P. contraverrugosum, P. cordilimbum,
P. cristalinanum, P. diguaense, P. enganyanum,
P. espejuelanum, P. espoliatum, P. exserens,
P. fructescens, P. gesneroides, P. heterolrichum,
P. ledezmae, P. lellingeri, P. lloro,
P. mandinganum, P. monsalvianum, P. patoense,
P. pedunculatum, P. pendulirameum, P. pilibracteum,
P. pseudo oxistachium, P. pseudocordi, P. ramosense,
P. roblalense, P. roldani, P. silvaticum, P. subconcinum,
P. subnitidum, P. tutunendó, P. umbriculum, P. urrao,
P. yatoensis, P. zingara
Piper amphioxys, P. annulatispicum, P. augustum-andino,
P. betanii, P. borucanum, P. bullulaefolium,
P. caeruleifolium, P. campamento, P. churruyacoanum,
P. cocornanum, P. copacabanense, P. cyprium, P. divortans,
P. domingense, P. dumeticola, P. el-bancoanum,
P. epyginium, P. escobinifolium, P. falanense, P. fatoanum,
P. fonnegrae, P. hermosanum, P. intersitum, P. jericoense,
P. la-doradense, P. miramarense, P. multiforme,
P. nigricaule, P. nodosum, P. nudifolium, P. pennellii,
P. perpusillum, P. pseudo lagunaense, P. pseudovariabile,
P. raizudoanum, P. scobinifolium, P. semitarium,
P. semperflorens, P. sneidernii, P. soejartoi, P. subdilatatum,
P. subnudispicum, P. subtrinerve, P. taboganum, P. tolimae,
P. vargasis, P. virgatum, P. zacatense
Piper adreptum, P. albogranulatum, P. apodum,
P. asclepiadifolium, P. barbicuspe, P. celer,
P. circumspectantis, P. cupreatum, P. claudicans,
P. epunctatum, P. ferruginispicum, P. indianonum,
P. interitum, P. klugianum, P. mishuyacuense,
P. paganicum, P. papillipetiolatum,
P. pernigricans, P. pervulgatum, P. rugosilimbum,
P. sanguineispicum, P. scapispicum, P. scapispicum,
P. subsilvestre, P. villosispicum, P. vitaceum
Journal of Biogeography 33, 1266–1278
ª 2006 The Authors. Journal compilation ª 2006 Blackwell Publishing Ltd
Distribution of Neotropical Piper
Andean region that show no relationship with any other areas,
and that comprise the endemic Andean species of Piper, as is
the case for species of the Churumayu clade, almost restricted
to the Puna province. Second, there is a close relationship
between areas of the Andean region and the Caribbean
subregion (North Andean slopes/Chocó/Cauca/Magdalena/
western Ecuador/eastern Central America/western Panama/
Mexican Pacific Coast) (species of the Radula, Macrostachys,
Peltobryon and Trianaeopiper groups). Third, there is a
relationship between the Andean region and the Amazonian
subregion (Andean slopes, Napo, Ucayali and Pantanal), which
include a large number of species of Isophyllon, Peltobryon and
Radula. These three patterns suggest a hybrid origin for
Andean pipers.
Three altitudinal zones can be recognized for species of Piper
in the Andes: the premontane-lower montane zone
(0–1000 m); the sub-Andean montane zone (1000–2300 m);
and the high Andean montane zone (2300–2800 m), with
species richness diminishing at altitudes over 2000 m (Marquis, 2004). According to the scheme proposed by Van der
Hammen (2000) to explain the history of Andean biodiversity,
those species of Piper with Andean distribution originated in
the tropical lowlands, probably during the Cretaceous and
Palaeogene, reaching their full diversification by the Miocene
and Pliocene. In this regard, it is relevant to cite the study by
Wijninga (1996) on the Neogene sediments from the Bogotá
Plains (2400 m present elevation), from which he reports (in
his atlas of fossil plants from the Neogene) a set of unidentified
seeds. Some of the seeds found by Wijninga (1996: plates 47,
48, 249, 285a and 285b) correspond, according to seed studies
in Piper (Callejas, 1986, 2002), to species of subgenus Ottonia,
a clade that is nowadays almost entirely restricted to the
Atlantic forests of Brazil and the Central Amazon, with a single
species on the western side of the Andes (Piper darienese). This
suggests that Amazonian species of Ottonia (and probably of
other clades) had a widespread distribution by the Pliocene in
today’s Andean region.
Distribution patterns such as those exhibited by Piper are
difficult to treat using a dispersalist approach. We interpret these
distributions based on our results, and on the ideas proposed by
Croizat (1976), in terms of two types of vicariance event: PreAndean and Post-Andean events. The Andean uplift could have
affected the distribution of Piper in various ways, as follows:
1. Certain species did not survive the alteration of their
habitats and became extinct, leaving fossil evidence of their
presence, or surviving only on the slopes of mountain ranges.
This is the case for the species belonging to Ottonia, which
support an endemism area in the western slopes of the Western
Cordillera near the border between Colombia and Panama;
and the generalized track in the Atlantic forests of Brazil.
2. Other species were able to adapt to environmental
conditions produced by the Andean uplift, giving origin to
groups that today are denominated Andean (such as the
Churumayu clade, with endemic areas distributed in the
Andes, which supports the only Andean generalized track
demarcated in our analysis).
3. Some other species might have been able to survive with
disjunct distributions in the intra-Andean valleys, but with
Amazon affinities (such as the Schilleria and Macrostachys
clades, both sustaining endemic areas in the Amazonian
province of Napo, and a generalized track that connects the
Andean slopes with the north of the Amazonian subregion).
With the formation of the Andes by the end of the Neogene,
the vegetation of the Amazonian subregion was split into
eastern and western elements, resulting in the formation of
several areas currently recognized as centres of endemism for
large portions of the Neotropical flora (Van der Hammen,
1960, 1961, 1974; Croizat, 1976; Callejas, 1999; Van der
Hammen, 2000; Jaramillo & Callejas, 2004). Both the
formation of the Andes and the relationship of a large part
of its flora with the Amazon are revealed by generalized tracks
that connect sub-Andean areas with the Amazonian provinces
of Napo, Ucayali and Pantanal, and with the province of
Chocó. Despite the fact that numerous elements of the flora in
the north of Rio Magdalena valley in Colombia are related to
species living in eastern Amazonia or the Guayana Shield
(Gentry, 1982; Cortés & Franco, 1997), and that this sector is
classified as one of the main biogeographical nodes of South
America (Croizat, 1976), which made up part of a fluvial
system that crossed over the Central Cordillera to Guayana
Shield (Croizat, 1976; Alemán & Ramos, 2000), we did not
detect a generalized track connecting the two areas. Moreover,
there is no generalized track connecting the Andean areas in
Colombia with the east Amazonian subregion because
sampling in the area of Magdalena is incomplete, because
Piper species are not informative on such connections, or
because Piper species in the Magdalena Valley represent
relictual distributions.
Just as the distribution patterns for species of Piper in the
north of the Neotropical region are closely linked to the rising
of the Andes, several different tectonic events in the southern
portion of the Neotropical region (province of Paraná) could
explain the current distribution patterns for the southern
Neotropical species of Piper. One of these is the isolation of
southern Amazonia from the Atlantic forest by the formation
of a large, lacustrine area along the Paranaı́ba, São Francisco
and Paraná rivers, (Petri & Fulfaro, 1983; Marroig &
Cerqueira, 1997; Amorim, 2001) and the rise of Serra do
Mar and Serra do Mantiqueira, producing several endemic
areas along the Atlantic forests. For this zone, a single
generalized track is revealed and supported by endemic species
of the subgenus Ottonia, a group previously mentioned as
having Amazonian and western Andean elements.
The distribution patterns and endemism areas of Piper
species suggest that Piper should not be denominated an
Andean-centred group, because the highest number of areas of
endemism and species richness are located in the Neotropical
region. In the present analysis, important areas in the
distribution of the genus are the Atlantic forests of Brazil
and the western Amazon, because they exhibit the vast
majority of Neotropical Piper clades. It is also noteworthy
that distributions of most Piper species are limited to small
Journal of Biogeography 33, 1266–1278
ª 2006 The Authors. Journal compilation ª 2006 Blackwell Publishing Ltd
1275
M. A. Quijano-Abril, R. Callejas-Posada and D. R. Miranda-Esquivel
areas or single sites, with a minority of widespread species,
suggesting a distribution pattern fragmented through history
by tectonic events.
ACKNOWLEDGEMENTS
The authors wish to express their gratitude to the herbarium of
the Universidad de Antioquia (HUA) and all the team for
making its collection of Neotropical pipers available. We thank
Juan Jose Morrone, Isolda Luna Vega, Tania Escalante and
Enrique Garcia Barros for their constructive comments on the
manuscript. We are particularly grateful to the editor, Douglas
Daly and Christopher Stobar for their help with the final
English revision. We also thank the curators of the following
Herbaria for kindly lending us material for this project: AAU,
COL, F, INBIO, L, MO, NY, TEX, US, U. The first author would
like to thank the staff of the Laboratorio de Sistemática y
Biogeografı́a UIS for their invaluable comments on this article.
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BIOSKETCHES
Mario Alberto Quijano Abril has a BSc in biology, and is
interested in the biogeography of Neotropical flora and in
historical biogeography methods, systematics and taxonomy of
Piperaceae. This study corresponds to his bachelor’s degree
project at Universidad Industrial de Santander, Colombia.
Ricardo Callejas Posada (PhD in biology) specializes in the
taxonomy and systematics of Piperaceae with special emphasis
on Neotropical species. His theoretical interests include plant
biogeography in the Americas and comparative plant evolution of palaeoherbs. He is currently a full-time lecturer at the
Instituto de Biologı́a, Universidad de Antioquia, Colombia.
Daniel Rafael Miranda-Esquivel is an Assistant Lecturer at
the Escuela de Biologı́a, Universidad Industrial de Santander,
Colombia. He is the founder and director of the Laboratorio
de Sistemática & Biogeografı́a. His research interests include
the phylogenetic history within Neotropical black flies
(Simuliidae) and horse flies (Tabanidae), the biogeographical
origin of the Neotropics, the development of quantitative
approaches to identify areas of endemism, and weighting
schemes in cladistic analysis.
Editor: Malte Ebach
Journal of Biogeography 33, 1266–1278
ª 2006 The Authors. Journal compilation ª 2006 Blackwell Publishing Ltd