Environmental correlates of internal coloration in frogs vary throughout space and lineages

Autor(es)

Franco-Belussi, Lilian ^{[1, 2]} ; Provete, Diogo Borges ^{[3, 4, 5]} ; De Oliveira, Classius ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Dept Biol, Sao Paulo - Brazil

^[2] Univ Fed Sao Carlos, Grad Program Biotechnol & Environm Monitoring, CCTS, Sao Paulo - Brazil

^[3] Univ Fed Sao Carlos, Dept Environm Sci, Sao Paulo - Brazil

^[4] Gothenburg Global Biodivers Ctr, Gothenburg - Sweden

^[5] Univ Fed Mato Grosso do Sul, Inst Biociencias, Campo Grande, MS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ECOLOGY AND EVOLUTION; v. 7, n. 22, p. 9222-9233, NOV 2017.
• Citações Web of Science: 2

Resumo

Internal organs of ectotherms have melanin-containing cells that confer different degrees of coloration to them. Previous experimental studies analyzed their developmental origin, role in immunity, and hormonal regulation. For example, melanin increases with ultraviolet radiation (UV) and temperature in frogs and fish. However, little is known about how environmental variables influence the amount of coloration on organs among amphibian species over a large spatial extent. Here, we tested how climatic variables (temperature, UV, and photoperiod) influence the coloration of internal organs of anurans. We recorded the level of melanin pigmentation using four categories on 12 internal organs and structures of 388 specimens from 43 species belonging to six anuran families. Then, we tested which climatic variables had the highest covariation with the pigmentation on each organ after controlling for spatial autocorrelation in climatic variables and phylogenetic signal in organ coloration using the extended version of the RLQ ordination. Coloration in all organs was correlated with the phylogeny. However, the coloration of different organs was affected by different variables. Specifically, the coloration of the heart, kidneys, and rectum of hylids, Rhinella schneideri, some Leptodactylus, and Proceratophrys strongly covaried with temperature and photoperiod, whereas that of the testicle, lumbar parietal peritoneum, lungs, and mesenterium of Leiuperinae, Hylodidae, Adenomera, and most Leptodactylus had highest covariation with UV-B and temperature. Our results support the notion that melanin pigmentation on the surface of organs of amphibians has an adaptive function conferred by the protective functions of the pigment. But most importantly, internal melanin seems to respond differently to climatic variables depending on the lineage and locality in which species occur. (AU)

• Processo FAPESP: 16/13949-7 - Padrões e processos na origem e diversificação da biodiversidade de vertebrados terrestres na Floresta Atlântica brasileira
• Beneficiário: Diogo Borges Provete
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 05/02919-5 - Anatomia e análise comparativa do sistema pigmentar extracutâneo em anuros da família Leptodactylidae: biologia estrutural dos melanócitos associados ao sistema reprodutor masculino
• Beneficiário: Classius de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/00946-4 - Pigmentação Visceral em Animais Ectotérmicos: Imunidade Inata e Defesa contra UV
• Beneficiário: Lilian Franco Belussi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/12006-9 - Influência de contaminantes ambientais (Acetato de ciproterona e Nonilfenol) e fatores abióticos (Temperatura e Radiação UV) na Melanina interna em anfíbios anuros
• Beneficiário: Classius de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular