Banca de QUALIFICAÇÃO: RODRIGO EDUARDO ESPINOSA BARRERA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : RODRIGO EDUARDO ESPINOSA BARRERA
DATE: 25/08/2023
TIME: 14:00
LOCAL: Remota - meet.google.com/yjc-rkyk-kmk
TITLE:

Distribution of decapod crustaceans from the upper Napo river basin, Ecuador

KEY WORDS:

Distribution, Palaemonidae, Trichodactylidae, Pseudothelphusidae, Ecuador.

PAGES: 57
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Freshwater decapod crustaceans have a wide global distribution, with about 2,600 species distributed worldwide, of which shrimps are distributed in 32 families and have about 800 species, while freshwater crabs have about 1,400 species distributed in 5 families. In South America, the diversity of these groups has not yet been studied, with Colombia, Brazil and Venezuela being the richest countries in terms of diversity. Ecuador, being a small country, is considered a diversity hotspot for several other groups, such as plants and amphibians. However, the study of the diversity of decapod crustaceans is scarce and only a few efforts have been made to know their diversity. The present study focused on sampling spatial and temporal diversity in various tributaries of the upper Napo River basin (an important tributary of the Amazon River) at 38 sampling sites during two seasons (2022 dry and wet). Our results showed that three families of decapods belonging to the families Palaemonidae (shrimps) and Trichodactylidae and Pseudothelpusidae (crabs) were found. In both collection stations, we did not find a significant difference in their population structure or abundance, indicating that there is no temporal variation in their populations. The sex ratio found was in favor of females in shrimp (1:2.8) and in favor of males in crabs (1:0.3). As for the environmental variables, the only variable that showed a significant difference in the two seasons was the flow of the river, and this variable, together with dissolved oxygen, was the best fit to explain the organization of the population in the scale. non-metric multidimensional mapping (NMDS) and generalized linear models (GLM). Furthermore, the complete absence of these decapod crustaceans in 4 divers, and when compared with their anthropic pressure, indicates the real potential of their use as bioindicators of water quality and aquatic ecosystems. Although this is a first effort to characterize the population and temporal structure of these freshwater decapod crustaceans, there are still many studies to be done, especially at the level of characterization of the taxonomic diversity within each family to know their real diversity and be able to carry out studies more focused on each of these groups in this small country, and one of the most diverse in South America.

COMMITTEE MEMBERS:
Presidente - 1217728 - FABRICIO LOPES DE CARVALHO
Interno - 1956163 - NADSON RESSYE SIMOES DA SILVA
Externo à Instituição - LUCAS REZENDE PENIDO PASCHOAL
Externo à Instituição - MARIANA TEROSSI RODRIGUES
Externo à Instituição - CARLOS EDUARDO ROCHA DUARTE ALENCAR
Externo à Instituição - BRUNO GABRIEL NUNES PRALON