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Discordance between morphological and molecular species boundaries among Caribbean species of the reef sponge Callyspongia.
DeBiasse, Melissa B; Hellberg, Michael E.
Afiliação
  • DeBiasse MB; Department of Biological Sciences, Louisiana State University 202 Life Sciences Building, Baton Rouge, Louisiana, 70803.
  • Hellberg ME; Department of Biological Sciences, Louisiana State University 202 Life Sciences Building, Baton Rouge, Louisiana, 70803.
Ecol Evol ; 5(3): 663-75, 2015 Feb.
Article em En | MEDLINE | ID: mdl-25691989
ABSTRACT
Sponges are among the most species-rich and ecologically important taxa on coral reefs, yet documenting their diversity is difficult due to the simplicity and plasticity of their morphological characters. Genetic attempts to identify species are hampered by the slow rate of mitochondrial sequence evolution characteristic of sponges and some other basal metazoans. Here we determine species boundaries of the Caribbean coral reef sponge genus Callyspongia using a multilocus, model-based approach. Based on sequence data from one mitochondrial (COI), one ribosomal (28S), and two single-copy nuclear protein-coding genes, we found evolutionarily distinct lineages were not concordant with current species designations in Callyspongia. While C. fallax,C. tenerrima, and C. plicifera were reciprocally monophyletic, four taxa with different morphologies (C. armigera,C. longissima,C. eschrichtii, and C. vaginalis) formed a monophyletic group and genetic distances among these taxa overlapped distances within them. A model-based method of species delimitation supported collapsing these four into a single evolutionary lineage. Variation in spicule size among these four taxa was partitioned geographically, not by current species designations, indicating that in Callyspongia, these key taxonomic characters are poor indicators of genetic differentiation. Taken together, our results suggest a complex relationship between morphology and species boundaries in sponges.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies Idioma: En Revista: Ecol Evol Ano de publicação: 2015 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies Idioma: En Revista: Ecol Evol Ano de publicação: 2015 Tipo de documento: Article