Growth, sexual maturity and sexual dimorphism of Aegla georginae (Decapoda: Anomura: Aeglidae) in a tributary of the Ibicuí River in southern Brazil

Abstract

Species of Aegla Leach, have a lifecycle that is entirely restricted to freshwater environments and is the only taxon of Anomura with this profile (Bond-Buckup et al. 2008, Fernandes et al. 2013). This genus is composed of over 70 described species with distributions restricted to subtropical South America (santos et al. 2013). Previous studies have contributed to the understanding of the population dynamics (i.e., longevity, recruitment, allometry, growth rates, juvenile cohort) in species such as Aegla platensis

Abundance and spatio-temporal distribution of the amphidromous shrimp Macrobrachium olfersii (Caridea: Palaemonidae) along the Ribeira de Iguape River (São Paulo, Brazil)

“…On the other hand, females and juveniles inhabit the marginal vegetation where they find shelter and food (Pyron et al, 1999;Montoya, 2003;Almeida et al, 2008), and are more likely to be caught by sieving. Similar behaviors that can lead to a higher capture of males by traps, have also been demonstrated in the mud shrimp Neotrypaea uncinata (H. Milne Edwards, 1837) (Garcia et al, 2003), in the crayfish Cherax cainii (Beatty et al, 2011) and many aeglids (Bueno et al, 2007;Teodósio and Masunari, 2009;Grabowski et al, 2013;Dalosto et al, 2014;Copatti et al, 2016).…”

“…For example, Rocha (2010) mentioned this issue when studying M. olfersii and M. acanthurus in a river within the Juréia-Itatins Ecological Station (in the same basin of Ribeira de Iguape). Differences in body size depending on the sampling methods have also been observed in other decapods, such as aeglids (Dalosto et al, 2014;Copatti et al, 2016).…”

“…We analyzed the abundance and spatio-temporal distribution using two capture methods. Due to the high habitat heterogeneity found in freshwater environments, there are many different methods that can be used to capture shrimps, such as traps, sieves, nets, electrofishing, and manual capture (Abele and Blum, 1977;Fièvet et al, 1996;Garcia et al, 2003;Rocha and Bueno, 2004;Rocha, 2010;Copatti et al, 2016). We also analyzed differences in the size and proportion of each sex in the samples, depending on the capture method.…”

“…Therefore, the sampling method influences the composition of the collected shrimps, because if the biased sex ratio was a true characteristic of the population, it would have been detected by both methods (Rocha, 2010). Thus, the combined use of both methods helps to cover all microhabitats occupied by the different demographic groups, as discussed by Copatti et al (2016) for Aegla georginae Santos and Jara, 2013.…”

Population and reproductive structure in the endangered and highly endemic freshwater crab Aegla concepcionensis (Decapoda:Pleocyemata:Aeglidae) from Chile

“…Gray bars correspond to Chilean species. (a) Bueno & Shimizu, 2008, 2009; (b) Bueno et al, 2014; (c) Fransozo et al., 2003; Marçal et al, 2018; (d) Chaves et al., 2019; (e) Cohen et al., 2013; (f) da Silva et al., 2016; (g) Rocha et al., 2010; (h) Teodósio and Masunari, 2009; (i) Grabowski et al, 2013, (j) Oliveira & Santos, 2011; (k) Noro & Buckup, 2002, 2003; (l) Colpo et al., 2005; (m) Gonçalves et al, 2006; (n) Copatti et al., 2016a; Copatti et al., 2016b; (o) Trevisan & Santos, 2012, 2014; (p) Catchpole, 2019; (q) Bahamonde and López, 1961; (r) Viau et al., 2006; (s) This study; (t) Jara, 1989…”