Towards the understanding of genetic and morphological variations of a highly abundant seaweed-associated marine invertebrate

Autor(es)

Longo, Pedro Augusto dos Santos ; Azevedo-Silva, Marianne ; Mansur, Karine Ferreira Ribeiro ; Marinho, Thais Aparecida ; Madeira, Andre Guilherme ; de Souza, Anete Pereira ; Hirota, Shun K. ; Suyama, Yoshihisa ; Mori, Gustavo Maruyama ; Leite, Fosca Pedini Pereira

• Tipo de documento: Artigo Científico
• Fonte: ESTUARINE COASTAL AND SHELF SCIENCE; v. 309, p. 16-pg., 2024-10-07.

Resumo

Unraveling the patterns of genetic structure and demographic history of marine species, as well as the factors that shape their genetic variations, is fundamental for informing conservation strategies for species and their environments. In this work, we investigate the current population structure and historical demographic patterns of the conspicuous seaweed-associated amphipod Hyale niger at a fine spatial scale in the subtropical SW Atlantic coast, in Brazil, by using both genome-wide and mitochondrial DNA markers. We also investigate how geographic distance, current oceanographic conditions, and variations in a key morphological trait contribute to the genetic variability of the amphipod. We observed an evident population genetic structure, even at a fine spatial scale, although genetic differentiation was lower than our expectations for a benthic direct brooder. Demographic history inferences were consistent across populations and showed two major demographic expansions on interglacial periods during the late Pleiostocene, before and after the last glacial maximum. We also demonstrated that isolation-by-environment (IBE) was the main driver of genetic differentiation, although we could not separate it from the effects of isolation-by-distance (IBD). Among environmental factors, nutrient concentrations in seawater were most relevant for explaining genetic structure. In addition, our data suggest that morphological variation in gnathopod 2 structure of males were not genetic-related and were probably plastic as a response to variations in macroalgae frond size. Our study reinforces the importance of using multiple molecular markers and analytical approaches to unveil patterns and processes generating genetic variation in natural populations. (AU)

• Processo FAPESP: 22/02804-9 - Avaliando adaptação, variação epigenética e dispersão para entender a resposta de mangues em um mundo em mudanças
• Beneficiário: Gustavo Maruyama Mori
• Modalidade de apoio: Auxílio à Pesquisa - Projeto Inicial
• Processo FAPESP: 20/07967-8 - Integração de genômica de populações e modelagem biofísica de dispersão por correntes oceânicas para inferência da conectividade de árvores de mangue do litoral brasileiro
• Beneficiário: Andre Guilherme Madeira
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 17/16837-8 - A eficiência da proteção de habitats costeiros: uma abordagem integrada no estudo da diversidade de macrófitas e invertebrados associados em áreas com diferentes status de conservação
• Beneficiário: Fosca Pedini Pereira Leite
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular
• Processo FAPESP: 23/03810-5 - Adaptação, plasticidade fenotípica e variação epigenética na persistência de mangues em novas condições ambientais
• Beneficiário: Andre Guilherme Madeira
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/10313-0 - Consolidação de coleções científicas de invertebrados marinhos: estratégias para conservação da biodiversidade
• Beneficiário: Antonia Cecília Zacagnini Amaral
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático