Habitat-dependent niche partitioning between colour morphs of the algal-dwelling shrimp Hippolyte obliquimanus

Autor(es)

Duarte, Rafael C. ^{[1, 2]} ; Flores, Augusto A. V. ^[1] ; Vinagre, Catarina ^[3] ; Leal, Miguel C. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Biol Marinha, Sao Sebastiao - Brazil

^[2] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Programa Posgrad Biol Comparada, Ribeirao Preto - Brazil

^[3] Univ Lisbon, Fac Ciencias, MARE Marine & Environm Sci Ctr, Lisbon - Portugal

^[4] Eawag Swiss Fed Inst Aquat Sci & Technol, Ctr Ecol Evolut & Biogeochem, Dept Fish Ecol & Evolut, Kastanienbaum - Switzerland

• Tipo de documento: Artigo Científico
• Fonte: Marine Biology; v. 164, n. 11 NOV 2017.
• Citações Web of Science: 7

Resumo

Trait-based differences among individuals are common and particularly important for polymorphic species in which alternative morphs exploit the same habitat types but occupy different trophic niches. The shrimp Hippolyte obliquimanus inhabits shallow-water vegetated habitats, particularly the seasonal and physically complex brown alga Sargassum furcatum and the less-structured but temporally stable red weed Galaxaura marginata. Two main colour morphs can be found in these habitats: homogeneous colour-changing shrimp that are able to match to their background and show little mobility, and transparent shrimp with coloured stripes, which cannot match their background, show lower habitat fidelity and are more evenly distributed between algal habitats. We used carbon and nitrogen stable isotopes and Bayesian mixing models to test whether morphspecific patterns of habitat use observed for H. obliquimanus living in Sargassum and Galaxaura meadows also influence trophic niche segregation. We observed morph-specific trophic differences that varied with habitat, with narrower niche space and lower niche overlap between morphs in Galaxaura meadows, and broader niche space and higher niche overlap between morphs in Sargassum habitat. Niche segregation between morphs occurred only in Galaxaura, where available resources are presumably less abundant than in Sargassum and the strength of competition between morphs is higher. Resource availability and habitat stability are likely driving dietary niche segregation between shrimp morphs, which can ultimately affect population dynamics and community composition in a spatially heterogeneous and seasonal habitat. (AU)

• Processo FAPESP: 12/17003-0 - Polimorfismo e sua função em camarões carídeos: uso de habitat e táticas reprodutivas em Hippolyte obliquimanus
• Beneficiário: Rafael Campos Duarte
• Modalidade de apoio: Bolsas no Brasil - Doutorado