Continent-island boundary and environment-shaped evolution in the marine amphipod Ampithoe marcuzzii complex (Crustacea: Eumalacostraca: Ampithoidae)

Autor(es)

Iwasa-Arai, Tammy ; Siqueira, Silvana G. L. ; Sobral-Souza, Thadeu ; Leite, Fosca P. P. ; Andrade, Sonia C. S.

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 14, n. 1, p. 18-pg., 2024-01-05.

Resumo

Marine amphipods are crustaceans that lack a larval phase and consequently have low dispersion rates. Despite that, these crustaceans present a remarkable ability to be transported by rafting on natural floating substrata, especially macroalgae, where they find shelter, food and a mating ground. The species Ampithoe marcuzzii is widely distributed throughout the western Atlantic Ocean. Here, it was used as a model to study seascape genomics and phylogeography in invertebrates with low dispersion capacities. We anticipated that the lineages would present isolation-by-distance patterns. However, surface currents and other abiotic variables could facilitate connectivity among distant sites. Based on mitochondrial and nuclear genes, SNPs, and environmental associations, we observed the presence of a species complex within A. marcuzzii, separating mainland and insular populations. Each species showed an independent evolutionary history, with a strong latitudinal population structure and evidence of isolation-by-distance and isolation-by-environment, characterizing the 'continent' species. Historical expansion and environmental variables were observed associated with the southeastern population, and ecological niche modeling corroborated the region as a paleorefuge. Conversely, populations from 'islands' presented complicated evolutionary histories, with closer localities genetically isolated and distant localities connected. These findings indicate that insular populations with low dispersion capacity might be more susceptible to spatial connectivity by floating substrata and to changes in surface currents. In contrast, mainland populations might be more vulnerable to local climate changes due to lack of gene flow. (AU)

• Processo FAPESP: 18/00488-7 - Delimitação de espécies, filogeografia comparativa e conectividade de Peracarida (Crustacea: Eumalacostraca) associados a Sargassum no Brasil com ênfase em populações insulares
• Beneficiário: Tammy Iwasa Arai
• 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
• Processo FAPESP: 15/20139-9 - Genética de paisagens marinha e avaliação de perfis de expressão em invertebrados marinhos na costa sudeste brasileira
• Beneficiário: Sónia Cristina da Silva Andrade
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• 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