Abstract
Abstract Atya gabonensis Giebel, 1875 and Atya scabra (Leach, 1816) are amphidromous shrimps. In some areas, these species populations are vulnerable due to the anthropogenic impact on their habitats and commercial exploitation. However, basic morphometric data is still lacking. This study provides morphometric data on both species in the Fluvial Island Domain of Paraiba do Sul River basin, Brazil. Sampling was performed bimonthly from January 2013 to March 2014. Individuals were analysed according to sex, weight, carapace length and width, abdomen length, second abdominal pleura height and width, length of third pereopod articles, and length and width of the male appendix interna. We sampled 42 individuals of A. gabonensis and 16 individuals of A. scabra. In both species, females showed abdomen and second abdominal pleura larger than males, while males showed third pereopod articles larger than females, both related to sexual dimorphism. We detected differences in the carapace length × carapace width relationship and in the growth pattern of the male appendix interna between species, with A. gabonensis presenting the carapace and the male appendix interna wider than A. scabra. Morphometric aspects of both species are unpublished for this region, and this data is valuable for A. gabonensis in the western Atlantic and for A. scabra from Rio de Janeiro state. Such information is essential for future systematic assessment and establishment of conservation management policies.
Highlights
Atya gabonensis Giebel, 1875 and Atya scabra (Leach, 1816) are phylogenetically close species of the family Atyidae De Haan, 1849 (Page et al, 2008; von Rintelen et al, 2012; Oliveira et al, 2019) with an amphidromous life cycle: their larvae are dependent on estuarine or marine environments (McDowall, 2007; Bauer, 2013)
The relationship between carapace length and individual weight was described by the potential equation y = 0.0002CL3.1895, where y is the weight and Carapace length (CL) is the carapace length in mm, with a determination coefficient (R2) of 97 %
As far as we know, the present study provides unique biological information about A. gabonensis on the American continent, allowing comparisons with population data from the African continent for the first time
Summary
Atya gabonensis Giebel, 1875 and Atya scabra (Leach, 1816) are phylogenetically close species of the family Atyidae De Haan, 1849 (Page et al, 2008; von Rintelen et al, 2012; Oliveira et al, 2019) with an amphidromous life cycle: their larvae are dependent on estuarine or marine environments (McDowall, 2007; Bauer, 2013). Atya gabonensis and A. scabra are target species of artisanal fishing at different intensities, both in Brazil and Africa (Oliveira, 1945; Motoh and Murai, 2006; Kadjo et al, 2016), and present significant interest in the aquarium trade (Werner, 2003; Lipták and Vitázková, 2015; Weiperth et al, 2019). Despite the wide geographic distribution and commercial interest, there are still few studies on the population biology of these two species. In Brazil, so far, there are mainly studies focusing on the diagnosis of the species and reporting its occurrence (Hobbs, 1980; Fonseca et al, 1994; Ramos-Porto and Coelho, 1998; Melo, 2003). In Brazil, so far, there are mainly studies focusing on the diagnosis of the species and reporting its occurrence (Hobbs, 1980; Fonseca et al, 1994; Ramos-Porto and Coelho, 1998; Melo, 2003). Galvão and Bueno (2000) studied the population structure of A. scabra and its reproductive biology in the Guaecá River, in the city of São Sebastião, while Herrera-Correal et al (2013) studied the fecundity and reproductive output at São Sebastião
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