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Population dinamic of shrimp Rimapenaeus constrictus (Stimpson, 1874) in relation to batimetry on northern coast of State of São Paulo

Grant number: 14/00517-6
Support type:Scholarships in Brazil - Master
Effective date (Start): April 01, 2014
Effective date (End): July 31, 2014
Field of knowledge:Biological Sciences - Zoology
Principal Investigator:Adilson Fransozo
Grantee:Bárbara Araújo Martins
Home Institution: Instituto de Biociências (IBB). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil

Abstract

The shrimp Rimapenaeus constrictus is endemic specie of Occidental Atlantic. Important features of specie's differentiation are the absence of post-orbital spine and the presence of short rostrum with nine teeth distributed throughout the dorsal region. Study about R. constrictus is very important, because the specie present relevant ecological paper, being part of marine food chain, serving as food to marine invertebrate and vertebrate. Trawling, performed extensively in southern and southeastern Brazil, is one of the greatest causes of impact in the marine biodiversity of these regions, also causing huge impact on population of R. constrictus. The project was divided in two subprojects, with the goal to comprehend the ecological distribution of R. constrictus related with the environmental features as well the population dynamic, reproductive period and recruitment of juveniles for the subproject I and analyze and compare the diel variation in the abundance and size of individuals of R. constrictus correlated with the environmental features for subproject II. Samples were collected in the year 2000 by a fishing boat equipped with one double rig net in nine transects (2, 5, 10, 15, 20, 25, 30, 35 and 40 m) of the Ubatuba region, being the samples of subproject I monthly and during the day and that of the subproject II, by season and during day and night. Both sampled approximately2 km per transect. A few works about R. constrictus are found, both in the southern hemisphere as in the northern hemisphere, what makes the achievement of this project needed for a better understanding of population dynamics, structure and bathymetric distribution of the species, thus serve as a subsidy for future work related to the maintenance of marine biodiversity.