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Endangered globose cactus Melocactus lanssensianus P. J. Braun depends on lizards for effective seed dispersal in the Brazilian Caatinga

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Abstract

Effective seed dispersal is essential to plant reproductive success. In this study, we evaluated the fruiting phenology, fruit traits, and seed dispersal of the endangered globose cactus Melocactus lanssensianus in the Brazilian Caatinga over 1-year period. We carried out monthly phenological monitoring, focal observations, and germination experiments, to identify the effective seed dispersers of this cactus. M. lanssensianus exhibited a continuous, non-seasonal fruiting pattern, with peaks during both the dry and rainy seasons. We observed seed dispersal by Tropidurus semitaeniatus and T. hispidus lizards. In 116 h of focal observations, lizards made 76 visits during different times of day, with a mean dispersal distance of 5 m. Both lizard species showed more frugivory interactions in the dry season, with peak visits in water-stressed months. We collected 132 intact and viable seeds from 29 fecal samples, specifically from T. semitaeniatus (N = 20 scats; 122 seeds) and from T. hispidus (N = 9 scats; 10 seeds). Germination experiments with seeds consumed by T. semitaeniatus, washed seeds and control seeds revealed that 85% of seeds found in T. semitaeniatus feces germinated compared to 41% of the control seeds. Frequency, pattern of visits and germination rates indicate T. semitaeniatus is an effective seed disperser of M. lanssensianus. Continuous production of fleshy fruits and environmental conditions of the Caatinga ecosystem favor the close dependent mutualistic interaction reported here.

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Acknowledgements

Thanks to Daniela Zappi and Nigel Taylor for identification of the cactus. Zaia’s family, Tarcizinho and Manoel for permission to work at Pão de Açúcar Ranch. Jocelino T. Lima for his support and opportunity to speak on the local radio program. Pollyana K. Silva to in vitro seed germination of M. lanssensianus. We also acknowledge the Associação Plantas do Nordeste (APNE) for logistic support, Rufford Foundation (RSGF nº 29813-2) for the grant to VGNG and Conselho Nacional de Desenvolvimento Científico e Tecnológico (Cnpq) for the scholarship to VGNG [300761/2021-0] and CALC [300750/2021-8].

Funding

VGNG was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) [300761/2021–0]. CALC was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) [300750/2021–8]. This work was financed in part by Rufford Foundation for the Grant to VGNG (RSGF No 29813–2).

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VGNG Substantial contribution in the concept and design of the study. VGNG, RK, and CALC Contribution to data collection, data analysis and interpretation. VGNG, RK, CALC, and FRCB Contribution to manuscript preparation. VGNG, RK, and FRCB Contribution to critical revision, adding intellectual content.

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Correspondence to Vanessa Gabrielle Nóbrega Gomes.

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Gomes, V.G.N., Koroiva, R., Cassimiro, C.A.L. et al. Endangered globose cactus Melocactus lanssensianus P. J. Braun depends on lizards for effective seed dispersal in the Brazilian Caatinga. Plant Ecol 222, 1375–1387 (2021). https://doi.org/10.1007/s11258-021-01185-7

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