Changes after 20 years in the population structure of the South American endemic shrimp Artemesia longinaris (Crustacea, Decapoda) on the southeastern Brazilian coast

• Autor(a) principal: Bernardo, Camila Hipolito [UNESP]
• Data de Publicação: 2019
• Outros Autores: Hiroki, Kátia Aparecida Nunes [UNESP], De Almeida, Ariádine Cristine [UNESP], Taddei, Fabiano Gazzi [UNESP], De Sousa, Aline Nonato [UNESP], Teixeira, Gustavo Monteiro [UNESP], Fransozo, Adilson [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/228744
• topic: Carapace size; Endemic shrimp; Sex ratio; Southwestern Atlantic; Ubatuba

The present study compared the population structure of the shrimp A. longinaris during two distinct periods (November/1988 to October/1989 and November/2008 to October/2009) in the Fortaleza Bay. We used Pearson correlation analysis to verify a possible association between temperature and cephalothorax length (CL) of the obtained individuals. 2412 females and 676 males of A. longinaris were captured in the first period; 843 females and 409 males, in the second. The mean size of shrimp was 15.6 mm CL in the first period and 14.3 mm CL, in the second (U=1066671.0; p < 0.05). Larger individuals were sampled at lower temperatures (Pearson's correlation; r2= -0.80; p < 0.05). In both periods of sampling, we have got adult females larger (mean sizes) than adult males. In addition, for both periods the sex ratio was in favor of females (p < 0.05). The intense trawling activity as well as the water temperature may have caused a sampling of smaller individuals in the second period. The sex ratio favoring females is possibly a result of migration of females to shallower regions, just after mating. After 20 years, only the mean size of the shrimp has changed among the analyzed aspects for A. longinaris.