2020-01-102020-01-102016LEITE, Alysson Antônio da Costa. Ecologia reprodutiva de Periclimenes paivai (Decapoda: Palaemonidae) e sua associação com a medusa Lychnorhiza lucerna (Scyphozoa: Shizostomeae). 2016. 35 f. Trabalho de Curso (Bacharelado em Oceanografia) - Faculdade de Oceanografia, Instituto de Geociências, Universidade Federal do Pará, Belém, 2016. Disponível em: https://bdm.ufpa.br/jspui/handle/prefix/2743. Acesso em:.https://bdm.ufpa.br/jspui/handle/prefix/2743Marine crustaceans are invertebrates with high diversity and many life style strategies, like the symbiotic association with other organisms, in search for protection, shelter, and better feeding and reproductive conditions. The reproductive parameters are important tools to elucidate ecological and evolutionary significance of inter-specific associations. This study focused on the symbiotic relationship between Periclimenes paivai, the facultative commensal partner-shrimp from the scyphozoan jellyfish Lychnorhiza lucerna, by population structure and reproductive parameters of the associated shrimps, as well as the correlation between these variables and the host’s size. The jellyfish and its associated shrimp were collected at the coast of São Paulo (Cananéia, Guarujá and Ubatuba) and Paraná (Paranaguá) states, Brazilian southern coast and in different occasions between 2008 to 2011. The sex and morphological parameters like the wet weight, total and carapace length were determined. Reproductive parameters were also analyzed like the sex ratio, fecundity and egg mass wet weight. The jellyfish bell diameter was obtained to test the correlation between host’s size and symbiont variables like the number of associated shrimp. From the 29 sampled jellyfish, 356 partner-shrimps were accounted (11 ± 10 / jellyfish), being Cananéia the locality with the highest number of shrimps per host (p < 0.001). No correlation was found between the size and of the host and number of symbionts. However, the shrimps collected at Cananéia and Paranaguá were bigger and showed higher fecundity than those at Ubatuba, which in contrast showed the highest reproductive output. Periclimenes paivai revealed higher values for fecundity and other reproductive parameters than the other species of the genus. The reproductive efficiency of P. paivai may be linked to its commensal life strategy and to host characteristics like the large volume of the jellyfish in relation to the shrimps, shelter, and probably abundant food resources. The pelagic environment was a possible evolutionary pressure resulting in high fecundity and the need to produce a high number of planktonic larvae to compensate the losses at the initial developmental stages.Acesso AbertoCamarão - Atlântico Sul, OceanoDecápode (Crustáceo) - Atlântico Sul, OceanoCNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIA::OCEANOGRAFIA BIOLOGICATrabalho de Curso - Graduação - Monografia