Banca de DEFESA: MATEUS GERMANO SOUZA LIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : MATEUS GERMANO SOUZA LIRA
DATE: 05/09/2023
TIME: 14:00
LOCAL: Google meet: meet.google.com/nay-abwi-zbx
TITLE:

Phylogeography and Ecological Niche Modeling of non-annual rivulids of the genus Kryptolebias Costa (Cyprinodontiformes) in neotropical mangroves

KEY WORDS:

self-fertilization, hermaphroditism, paleoclimate, climate change, geographic distribution, deglaciation

PAGES: 140
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUBÁREA: Ecologia Aplicada
SUMMARY:

Kryptolebias is a genus of non-annual fish of the Rivulidae family, its representatives inhabiting diverse microhabitats, ranging from small streams and coastal freshwater marshes to mangroves. Freshwater species that are endemic to South America have a restricted geographic distribution, including critically endangered species. On the other hand, estuarine representatives have a wide geographic distribution, with the species of the K. marmoratus complex (K. marmoratus and K. hermaphroditus) occurring from Florida, in the United States, to São Paulo in Brazil and K. ocellatus occurring from Rio from January to Santa Catarina. These species overlap throughout their total range with K. marmoratus overlapping with K. hermaphroditus in the western North Atlantic in localities of San Salvador and Cuba, just as K. ocellatus overlaps with K. hermaphroditus in areas of mangroves in Rio de Janeiro, Brazil. Historically, mangrove Kryptolebias faced taxonomic problems, with inconsistencies between molecular and morphological data. However, with advances in genetic studies with the group, a greater understanding of the limits of distribution between lineages and genetic structure has emerged. In Brazil, initially the species of the genus Kryptolebias were only known from the southeast region, having purely descriptive works. However, records in the north and northeast, which included the first male of K. hermaphroditus in a Brazilian locality, in addition to the possible occurrence of K. marmoratus in the northeast, raised questions about the real distribution of the genus in the mangroves of the Western Atlantic. Phylogeographic studies suggested different lineages occurring in the K. marmoratus complex, but with large gaps in genetic information and distribution throughout South America. Therefore, a project with national and international partnerships was necessary, in order to investigate the distribution and history natural species of the genus Kryptolebias. Based on this, the objectives of this work are to indicate the current distribution for Kryptolebias species from mangroves on the Brazilian coast, with a phylogeographic approach, indicating the genetic structure along the distribution. In addition to testing, based on ecological niche models, whether climate changes after the last glacial maximum, mainly the increase in temperature, promoted the expansion of the distribution of K. hermaphroditus. The results indicate 14 new records covering 5,434 km of the braziliam coast, expanding the limits of distribution of the Central and Southern clade clade (K. hermaphroditus). An evident genetic structure is observed in the populations of the Caribbean, Bonaire and Aruba, with the population of northeastern Brazil demonstrating a probable population expansion. In contrast, the southeastern population of K. hermaphroditus shares a single mitochondrial haplotype, an indication of recent colonization. The distribution models of indicate a probable expansion of K. hermaphroditus, where the Middle Holocene demonstrated a larger area of habitat suitability than the current scenario. The same is observed in K. ocellatus appears to have a loss of suitability at present, in relation to paleoclimatic scenarios. Despite the overlapping distribution between K. hermaphroditus and K. ocellatus in southeastern Brazil, the results of environmental niche overlap did not show significant values.

COMMITTEE MEMBERS:
Presidente - 1865104 - SERGIO MAIA QUEIROZ LIMA
Externo à Instituição - PABLO RIUL - UFPB
Externo à Instituição - ALEX BARBOSA DE MORAES - UFES
Externo à Instituição - ANDERSON VILASBOAS DE VASCONCELLOS - UERJ
Externa à Instituição - FLÁVIA DE FIGUEIREDO PETEAN