Population dynamics of Farfantepenaeus subtilis (Perez-Farfante, 1967) and Litopenaeus schmitti (Burkenroad, 1936) (Decapoda: Penaeidae) and evidence of habitat partitioning in the northeast of Brazil

Autor(es)

Santos, Rafael de Carvalho ^{[1, 2]} ; Perroca, Julia Fernandes ^[2] ; Costa, Rogerio Caetano ^[2] ; Hirose, Gustavo Luis ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sergipe, Dept Biol, Lab Carcinol, Av Marechal Rondon S-N, BR-49100000 Sao Cristovao, Sergipe - Brazil

^[2] Sao Paulo State Univ, Lab Biol Marine & Freshwater Shrimps LABCAM, Dept Biol Sci, UNESP, Q1 Fac Sci, Bauru, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: REGIONAL STUDIES IN MARINE SCIENCE; v. 35, MAR 2020.
• Citações Web of Science: 0

Resumo

The population structure, sex ratio, size at the onset of sexual maturity, growth rates, and longevity of Farfantepenaeus subtilis and Litopenaeus schmitti were studied in the State of Sergipe, Brazil. The distribution pattern of juveniles and reproductive females was compared to investigate whether habitat partitioning takes place between these species. The sampling occurred monthly, from September/2013 to August/2014, in nine stations of three transects (5 m, 15 m, and 30 m deep) using a shrimp fishing boat. In total, 1076 F. subtilis and 499 L. schmitti individuals were captured. The sex ratio of F. subtilis was skewed toward females, while L schmitti had a 1:1 sex ratio. Females of both species were larger than the males. The size at the onset of sexual maturity of F. subtilis females was large than that of males, while the opposite occurred in L schmitti. The estimated growth parameters of F. subtilis males were: CL infinity = 33.24 mm, k = 2.30/year and longevity = 2.0 years. For the females, they were: CL infinity = 42.49 mm, k = 2.15/year and longevity = 2.12 years. The growth parameters of L schmitti males were: CL infinity = 32.48 mm, k = 2.41/year and longevity = 1.91 years. For the females, they were: CL infinity = 38.78 mm, k = 2.01/year and longevity = 2.29 years. The distribution patterns of juveniles and reproductive females differed between species. F. subtilis females predominated in deeper waters. Juveniles of L. schmitti were aggregated in shallow waters (5 m), while F. subtilis aggregated at 15 m. Considering that (1) the relationship between the environmental factors and the abundance of juveniles and females was not evident, and (2) the reproductive and recruitment periods of these species are synchronized, our results suggest that habitat partitioning takes place to decrease the interspecific competition. (C) 2020 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 18/00739-0 - Descrição e identificação da morfologia do primeiro estágio larval dos camarões do gênero Synalpheus Spence bate, 1888 (Decapoda, Caridea, Alpheidae) do litoral do estado de São Paulo
• Beneficiário: Rafael de Carvalho Santos
• Modalidade de apoio: Bolsas no Brasil - Doutorado