Intra-specific competition drives variation in the fundamental and realized niches of the hermit crab, Pagurus criniticornis

Autor(es)

de Souza, Estevao C. F. ^[1] ; Turra, Alexander ^[2] ; Leite, Fosca P. P. ^[3] ; Gorman, Daniel ^[2]

Afiliação do(s) autor(es)

^[1] Inst Chico Mendes Conservacao Biodiversidade ICMB, Reserva Biol Atol Rocas, Natal, RN - Brazil

^[2] Univ Sao Paulo, Inst Oceanog, Sao Paulo, SP - Brazil

^[3] Univ Estadual Campinas, Inst Biol, Dept Biol Anim, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BULLETIN OF MARINE SCIENCE; v. 91, n. 3, p. 343-361, JUL 2015.
• Citações Web of Science: 3

Resumo

The difference between preferred and available resources within natural environments can be viewed as the disparity between fundamental and realized niches. We employ this concept to examine intra-specific sexual variation in the shell-size relationships of the hermit crab Pagurus criniticornis (Dana, 1852) from two treatments: (1) a natural unbiased population (i.e., realized niche); and (2) a group subjected to free-choice experiments that were able to select a preferred shell from a selection of high-quality shells (i.e., fundamental niche). Crab-shell relationships for both treatments suggest that males and females select shells proportional to their size. The relationships between crab size and preferred shell weight (i.e., fundamental niche) derived from free-choice experiments enabled the calculation of a shell adequacy index (SAI) for all individuals from both treatments. A strong interaction between SAI values across sex and treatment (male Free choice = female Free choice = male Population > female Population) suggested that non-ovigerous females may experience a considerable niche disparity in their natural habitats while ovigerous females tend to inhabit shells with a greater prevalence of damaged shell apices. Results suggest a competitive hierarchy whereby males out-compete females for access to high-quality shells. Despite niche disparities, P. criniticornis typically occupied shells of good condition (low damage and encrustation), suggesting that resource limitation may not be as severe as that reported for other hermit crab populations. Our data provide insights into intra-specific competition that reflect the ability of individuals to win and hold high-quality resources within resource-limiting environments. (AU)

• Processo FAPESP: 13/07576-5 - Ecologia populacional de invertebrados bentônicos na baía do Araçá, Litoral Norte do Estado de São Paulo
• Beneficiário: Daniel Gorman
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 99/11233-7 - Atração de Pagurus criniticornis (Dana, 1852)(Decapoda, Anomura) por eventos de predação simulada
• Beneficiário: Estevão Carino Fernandes de Souza
• Modalidade de apoio: Bolsas no Brasil - Mestrado