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Ecological specialization and macroevolutionary patterns: First test of resource-use hypothesis in marine vertebrates (Cetacea, Mammalia)

AuthorsBlanco, Fernando; Gamboa, Sara; Pelegrín-Ramírez, Jonathan S. ; Cantalapiedra, Juan L. ; Menéndez, Iris; Gómez Cano, Ana R. ; Hernández Fernández, M.
Issue Date19-Aug-2018
CitationEvolution (2018)
AbstractThe resource-use hypothesis developed by Vrba predicts that specialist species have higher speciation and extinction rates than generalist ones, due to their higher susceptibility to resource restriction, which makes them more sensitive to environmental change, vicariance and directional selection. Here, we present the first test of the resource-use hypothesis in marine organisms (Cetacea). We identified 6 different marine biomes, based on biotic and abiotic variables. Using distribution data, we estimated the occupation of biomes for each species and the total number of occupied biomes (the biome specialization index, BSI). To test the resource-use hypothesis, we run 10,000 Montecarlo randomizations of the observed data, and compare the randomized distribution of BSI values with the observed ones. Besides, we developed a phylogenetic likelihood-based method (QuaSSE) for testing whether the degree of biomic specialization affects speciation rates in Cetacean lineages. Results are consequent with the hypothesis predictions: 1) we found more specialists than expected by chance, 2) higher proportions of specialists than expected by chance were associated to biomes at the extreme of the primary production gradient, and 3) there were differences in the biome occupancies between Odotoceti and Mysticeti. These results reveal the relevance of the diverse ecological and physiological requirements among species and between the two big groups of Cetacea for their evolution.
DescriptionTrabajo presentado en II Joint Congress on Evolutionary Biology (Evolution), celebrado en Montpellier (Francia), del 19 al 22 de agosto de 2018
Appears in Collections:(MNCN) Comunicaciones congresos
(IGEO) Comunicaciones congresos
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