Ten-year variations in population structure of pink-shrimp in a southwestern Atlantic Bay affected by highway construction

Abstract

OBJECTIVES: Population structures of Farfantepenaeus brasiliensis and F. paulensis, consisting mainly of juveniles, were evaluated during the construction of an expressway along a mangrove area. Estuarine regions in southern Brazil function as sites for reproduction, nursery and growth of a variety of organisms, including two of the most important species of shrimp for fisheries in the southwestern Atlantic. Shrimps were collected in Saco dos Limões creek, Baía-Sul, Florianópolis, State of Santa Catarina, four times a year, by day and night, between 1997 and 2006. Fluctuations in the abundances of shrimp appear to be related to their life cycles, with largest abundances in Summer and Spring, rather than to impacts promoted by dredging activities during the expressway construction.

Biometric relationships and sex ratio for red-spotted shrimp Farfantepenaeus brasiliensis (Latreille, 1817) (Decapoda, Penaeidae) from the coast of Sergipe, northeastern Brazil

“…The sex ratio of 1:1 observed here is very common in penaeids (Dall et al, 1990), especially for populations occupying relatively constant environments (Geisel, 1972). Likewise, sexual dimorphism is a very common trait in penaeids, with females being larger than males, which has also been observed for F. brasiliensis in our study, and also by Mello (1973), Arreguín-Sánchez (1981), Rabelo-Neto (1985), Leite-Jr and Petrere-Jr (2006), Freitas-Jr et al (2011), and Souza et al (2019). This dimorphism ref lects a reproductive strategy, as larger size for females allows for larger gonads and higher fertility and, thus, maximizes egg production (Gab-Alla et al, 1990).…”

“…Morphometric relationships vary according to the length/age, with younger, smaller individuals having higher slopes than older, larger individuals requiring different equations for conversions (Arreguín-Sánchez, 1981;Primavera et al, 1998;Reis-Jr et al, 2019). Most of the morphometric data available for F. brasiliensis are from juveniles/subadults inhabiting coastal habitats such as estuaries and coastal lagoons (Villela et al, 1997;Branco and Verani, 1998;Pérez-Castañeda and Defeo, 2002;Albertoni et al, 2003;May-Kú et al, 2006;Freitas-Jr et al, 2011;Carvalho et al, 2019), which differ from the equations for adults such as the ones obtained here in the coast of Sergipe. Table 2.…”

Morphometric variation in pink shrimp populations at Rio de Janeiro coast (SE Brazil): are they really similar in closer areas?

“…On the other hand, the dominance of F. paulensis can be observed only in very shallow estuarine areas from 27º30'S (Table IX). Freitas et al (2011) also found a large variation of the Fb/Fp ratio (1.39-7.70) during the study period (1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006) in Saco dos limões, Southern Bay, Santa Catarina, Brazil (Table IX). The authors suggested that this variation was associated with interannual mortality and recruitment variability of F. brasiliensis, since F. paulensis populations remained stable over time.…”

“…It has been reported that F. brasiliensis and F. paulensis shrimps present considerable intraspecific and interspecific variability (Teodoro et al 2016). The morphometry of pink shrimps have already been investigated in continental shelf of the Southeast-South of Brazil (eg, Neto 1985, leite Jr andPetrere Jr 2006) and in estuarine systems (eg, Branco and Verani 1998a, 1998b, Albertoni et al 2003, Freitas Jr et al 2011, but none of them with a comparative approach between geographically close areas. Most of the studies investigated differences in their spatial distribution and abundance without regarding morphological differences (eg, Costa et al 2008(eg, Costa et al , 2016(eg, Costa et al , lüchmann et al 2008.…”