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What is the impact of trawling on shrimp assembly in marine coastal areas? A temporal analysis of populations at ecosystem level on the North Coast of São Paulo

Grant number: 19/01308-5
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): June 01, 2020
Effective date (End): May 31, 2023
Field of knowledge:Biological Sciences - Zoology - Morphology of Recent Groups
Principal researcher:Rogério Caetano da Costa
Grantee:Júlia Fernandes Perroca
Home Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil
Associated research grant:18/13685-5 - Integrative analysis of the Brazilian fauna of decapod crustaceans: taxonomy, phylogenetic systematics, spermiotaxonomy, morphology of post-embryonic development, ecology and conservation, AP.BTA.TEM

Abstract

Shrimps are highly exploited resources in marine ecosystems because of their high commercial value and are a source of income for numerous fishermen on the southeastern coast of Brazil. Despite its social and economic importance, shrimp fishing is recognized as an activity that generates impacts, some of which are the disruption of the marine substratum and the high catch of non-target organisms from the fishing, due to the low selectivity of the trawl. Currently, these impacts are serious concerns of conservation agencies and the fishing industry worldwide, making ecological analyzes of exploited populations and ecosystems important demands for the management and sustainability of the activity. Long-term population analysis allows the identification of the absence or presence of variations in life-cycle, spatial-temporal distribution and ecosystem diversity patterns and whether these are due to such activity. Thus, in the present study the long-term variability of the abundance and biomass of the crustaceans X. kroyeri, A. longinaris, L. schmitti, P. muelleri, R. constrictus, F. paulensis, F. brasiliensis, S. dorsalis, N. schmitti and E. oplophoroides, species caught in trawling at the Ubatuba Cove, off the coast of São Paulo. In addition, the species diversity of crustaceans will be estimated in the study ecosystem and, later on, the temporal trends of these metrics will be evaluated. The data used will come from 30-minute monthly trawls at 4 sampling points, to be carried out from July 2019 to August 2020, together with data previously obtained at the same points (1995 - 2017) and with the same effort sample. The environmental data available for the whole sampling period and which will continue to be monitored are surface and bottom water temperature and salinity, organic matter content and sediment granulometry. The collected shrimp were and will be identified for the species, weighed (G), measured on carapace length (CCmm) and separated by sex. According to the obtained results, the statistical analyzes pertinent to each proposed objective will be carried out, trying to interpret possible population variations in function of the environmental factors and the effects of the fishing in the diversity. (AU)

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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SALVATI, DALILLA DA SILVA; PERROCA, JULIA FERNANDES; SIMOES, SABRINA MORILHAS; CASTILHO, ANTONIO LEAO; DA COSTA, ROGERIO CAETANO. Variation in size distribution of juvenile pink shrimps Farfantepenaeus brasiliensis and F. paulensis in the estuarine-adjacent ocean area of Cananeia, south-eastern coast of Brazil. Journal of the Marine Biological Association of the United Kingdom, v. 101, n. 1, p. 117-129, . (10/50188-8, 18/13685-5, 19/01308-5, 15/15210-6)
NOGUEIRA, CAIO S.; PERROCA, JULIA F.; BATISTA, ABNER C.; COSTA, ROGERIO C.. Reproductive traits of the freshwater prawn Macrobrachium amazonicum (Decapoda: Palaemonidae) in an isolated water reservoir. Revista Mexicana de Biodiversidad, v. 91, . (19/00661-3, 18/13685-5, 19/01308-5)
PERROCA, JULIA FERNANDES; NOGUEIRA, CAIO SANTOS; CARVALHO-BATISTA, ABNER; COSTA, ROGERIO CAETANO. opulation dynamics of a hololimnetic population of the freshwater prawn Macrobrachium amazonicum (Heller, 1862) (Decapoda, Palaemonidae) in southeastern Brazi. AQUATIC ECOLOGY, v. 56, n. 1, . (18/13685-5, 19/01308-5, 19/00661-3)
AZEVEDO-SANTOS, VALTER M.; BRITO, MARCELO F. G.; MANOEL, PEDRO S.; PERROCA, JULIA F.; RODRIGUES-FILHO, JORGE LUIZ; PASCHOAL, LUCAS R. P.; GONCALVES, GESLAINE R. L.; WOLF, MILENA R.; BLETTLER, MARTIN C. M.; ANDRADE, MARCELO C.; et al. Plastic pollution: A focus on freshwater biodiversity. AMBIO, v. 50, n. 7, SI, p. 1313-1324, . (19/01308-5)

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