Stable isotopes and diet uncover trophic-niche divergence and ecological diversification processes of endemic reptiles on Socotra Island
The isotope data used in this article is available in Dryad (http://dx.doi.org/10.5061/dryad.p53b1).
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| Language: | English |
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Elsevier
2017-03
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| Subjects: | Ecological diversification, Endemism, Reptiles, Socotra, Stable isotopes, Trophic niche, |
| Online Access: | http://hdl.handle.net/10261/152646 http://dx.doi.org/10.13039/501100004630 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100001871 http://dx.doi.org/10.13039/501100003176 |
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dig-ibe-es-10261-1526462018-09-27T07:34:35Z Stable isotopes and diet uncover trophic-niche divergence and ecological diversification processes of endemic reptiles on Socotra Island Martín, Natalia Martínez, Sergi Pujol-Buxó, Eudald Viñolas, Amador Llorente, Gustavo A. Sanpera, Carolina Vasconcelos, Raquel Carranza, Salvador Santos, Xavier Mohamed bin Zayed Species Conservation Fund Ministerio de Economía y Competitividad (España) European Commission Fundação para a Ciência e a Tecnologia (Portugal) Ministerio de Educación, Cultura y Deporte (España) Ecological diversification Endemism Reptiles Socotra Stable isotopes Trophic niche The isotope data used in this article is available in Dryad (http://dx.doi.org/10.5061/dryad.p53b1). Ecological diversification on islands typically results in divergence of ecological niches. As diet is a major component of species niches, we hypothesize that sister species within island monophyletic groups diversify in their dietary preferences. We have examined this hypothesis in two Haemodracon and four Hemidactylus species endemic reptiles of from Socotra Island (Yemen), corresponding to two independent colonization events. Convergence i.e., similar dietary patterns of phylogenetically unrelated species, was also examined. Trophic niches were studied by the analysis of carbon and nitrogen stable isotopes combined with faecal samples. We collected tail tips (for isotopes) and faecal pellets during two visits in 2013 and 2014 to Socotra. Specific trophic niche widths inferred from stable isotopes were estimated from ellipse-based metrics, whereas interspecific differences were compared by linear mixed models and examined in a phylogenetic framework. From faecal samples, diet variation among species was quantified by the Bray-Curtis index. Isotope and dietary interspecific divergence was compared with Mantel tests. For both isotopes, models detected interspecific differences between sister species i.e., trophic niche divergence and also interspecific similarities of distant lineages that use similar microhabitats i.e., ecological convergence. We did not find any phylogenetic signal neither in the interspecific differences in δ13C nor in δ15N isotopic values; thus species phylogenetically more closely related did not have more similar isotopic niches. The Mantel test demonstrated similar interspecific divergence using isotopes and faecal samples. In a phylogenetic context, trophic-niche interspecific comparisons highlight some mechanisms that are driving ecological diversification and speciation of Socotra Island. This article is an output of project 13055714 financed by the Mohamed bin Zayed Species Conservation Fund, and grant CGL2012-36970 from the Ministerio de Economía y Competitividad, Spain (co-funded by FEDER). XS and RV are supported by Postdoctoral grants from the Fundação para a Ciência e Tecnologia (FCT) (SFRH/BPD/73176/2010 and SFRH/BPD/79913/2011 respectively). EPB is in receipt of an FPU grant (AP2010-5563) from the Spanish Government. Peer reviewed 2017-07-12T07:20:52Z 2017-07-12T07:20:52Z 2017-03 artículo http://purl.org/coar/resource_type/c_6501 Zoologischer Anzeiger 267: 69- 81 (2017) 0044-5231 http://hdl.handle.net/10261/152646 10.1016/j.jcz.2017.01.005 http://dx.doi.org/10.13039/501100004630 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100001871 http://dx.doi.org/10.13039/501100003176 en https://doi.org/10.1016/j.jcz.2017.01.005 Sí none Elsevier |
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| language |
English |
| topic |
Ecological diversification Endemism Reptiles Socotra Stable isotopes Trophic niche Ecological diversification Endemism Reptiles Socotra Stable isotopes Trophic niche |
| spellingShingle |
Ecological diversification Endemism Reptiles Socotra Stable isotopes Trophic niche Ecological diversification Endemism Reptiles Socotra Stable isotopes Trophic niche Martín, Natalia Martínez, Sergi Pujol-Buxó, Eudald Viñolas, Amador Llorente, Gustavo A. Sanpera, Carolina Vasconcelos, Raquel Carranza, Salvador Santos, Xavier Stable isotopes and diet uncover trophic-niche divergence and ecological diversification processes of endemic reptiles on Socotra Island |
| description |
The isotope data used in this article is available in Dryad (http://dx.doi.org/10.5061/dryad.p53b1). |
| author2 |
Mohamed bin Zayed Species Conservation Fund |
| author_facet |
Mohamed bin Zayed Species Conservation Fund Martín, Natalia Martínez, Sergi Pujol-Buxó, Eudald Viñolas, Amador Llorente, Gustavo A. Sanpera, Carolina Vasconcelos, Raquel Carranza, Salvador Santos, Xavier |
| format |
artículo |
| topic_facet |
Ecological diversification Endemism Reptiles Socotra Stable isotopes Trophic niche |
| author |
Martín, Natalia Martínez, Sergi Pujol-Buxó, Eudald Viñolas, Amador Llorente, Gustavo A. Sanpera, Carolina Vasconcelos, Raquel Carranza, Salvador Santos, Xavier |
| author_sort |
Martín, Natalia |
| title |
Stable isotopes and diet uncover trophic-niche divergence and ecological diversification processes of endemic reptiles on Socotra Island |
| title_short |
Stable isotopes and diet uncover trophic-niche divergence and ecological diversification processes of endemic reptiles on Socotra Island |
| title_full |
Stable isotopes and diet uncover trophic-niche divergence and ecological diversification processes of endemic reptiles on Socotra Island |
| title_fullStr |
Stable isotopes and diet uncover trophic-niche divergence and ecological diversification processes of endemic reptiles on Socotra Island |
| title_full_unstemmed |
Stable isotopes and diet uncover trophic-niche divergence and ecological diversification processes of endemic reptiles on Socotra Island |
| title_sort |
stable isotopes and diet uncover trophic-niche divergence and ecological diversification processes of endemic reptiles on socotra island |
| publisher |
Elsevier |
| publishDate |
2017-03 |
| url |
http://hdl.handle.net/10261/152646 http://dx.doi.org/10.13039/501100004630 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100001871 http://dx.doi.org/10.13039/501100003176 |
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