Aspectos ecológicos e biologia reprodutiva de dois bivalves invasores em habitats costeiros no Nordeste brasileiro

• Ano de defesa: 2019
• Autor(a) principal: Queiroz, Romilda Narciza Mendonça de
• Tipo de documento: Tese
• Tipo de acesso: Acesso embargado
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraíba; Brasil; Zoologia; Programa de Pós-Graduação em Ciências Biológicas; UFPB
• Palavras-chave em Português: Espécies invasoras; Distribuição; Biologia reprodutiva; Costa Nordeste; Invasive species; Distribution; Reproductive biology; Northeastern coast; CNPQ::CIENCIAS BIOLOGICAS::ZOOLOGIA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/123456789/18704

The bioinvasões has caused great economic impacts and in ecosystems, harming native species and altering the food chain. Given this, it is important to know better the ecology, biology and factors that favor these invasive species. In this sense, this study aimed to analyze the ecological aspects and the reproductive cycle of the invasive bivalves Mytilopsis sallei and Isognomon bicolor, in addition to assessing environmental factors that may be favoring their establishment and growth in coastal ecosystems in Northeastern Brazil. The first chapter presents a study in which the abundance and distribution of M. sallei in the Paraíba River estuary, located in Paraíba, was evaluated. Sampling was conducted in six sampling stations along the estuary, covering a wide range of salinities, from upstream to downstream of the river. The results showed that M. sallei was the most abundant benthic species in this estuary, although it does not have a wide distribution, occurring only in one season, the furthest from the river mouth and the most polluted. This station was also the one with the lowest salinities, which was an abiotic factor that prevented the distribution of M. sallei in the estuary. The main microhabitat for M. sallei was the pneumatophore type roots of mangrove trees and decomposing wood, which were shared by other species with similar behaviors and tolerance profiles. In the second chapter, the study of the reproductive biology of the invasive bivalves Mytilopsis sallei and Isognomon bicolor is presented. For this purpose, the bivalves were collected monthly from June 2016 to May 2017, with M. sallei obtained from the estuary of the Rio Sanhauá and I. bicolor at Jacarapé beach, also located in Paraíba. The collected bivalves were submitted to histological slide preparation procedures to identify the stages of development of the gonad and analyze various reproductive parameters. In both species, spawning and mature individuals predominated in the 12 months studied. Mytilopsis sallei presented more than 50% of the spawning individuals in most months, with gametogenesis mainly in the period of greatest average precipitation. Isognomon bicolor had mature (about 40%) and spawning (more than 40%) individuals in all months of the year, but had the highest concentration of mature individuals in the months of greatest precipitation. The results obtained from the reproductive aspects studied confirm the great invasive potential of the two species.