Crustáceos no cerrito Ariano Souza, Rio Grande, Rio Grande do Sul e distribuição de Callinectes sapidus (Brachyura, Portunidae)

Abstract

ABSTRACT. Crustaceans in the archaeological site Ariano Souza, Rio Grande, Rio Grande do Sul and distribution of Callinectes sapidus (Brachyura, Portunidae). While all species of the genus Callinectes Stimpson, 1860 have a continuous distribution on the Atlantic coast of the Americas, Callinectes sapidus Rathbun, 1896 is the only one with disjunct distribution. Considering that this species was introduced in Europe and Japan, it has been suggested that the occurrence of C. sapidus on the southern coast of Brazil was due to the transport by ballast water. In the archaeological site Ariano Souza, located in the estuary of the Patos Lagoon (southern Brazil), remains of crustaceans, including claws of approximately two thousand years ago, were found. A preliminary analysis of this material showed Callinectes chelae. Because this archaeological site is located inside the estuary, it has been hypothesized that these chelae belong either to C. sapidus or to C. danae Smith, 1869. A comparison between pincers collected in the archaeological and pincers of these two species (90 dactyls, 30 of each type) was performed. The analysis (ANOVA) considered the variability of seven characters of the dactyls, and demonstrated the existence of two groups. Results showed that the measured characters suffice to separate these species, and indicated that the material found in the archaeological site belongs to C. sapidus. The hypothesis of the introduction of C. sapidus in the area is rejected. The possible biogeographic history of the species is discussed.

Population genetics and historical demographic inferences of the blue crabCallinectes sapidusin the US based on microsatellites

“…Similarly, the RAD-sequencing study of Plough (2017) found that two individuals from Porto Alegre, Brazil, within the region sampled by Lacerda et al (2016), are highly differentiated from those in the two US localities he examined. A disjunct distribution for the blue crab has been suggested (Rodrigues et al, 2017; Santos & D’Incao, 2004), with a gap in northern South America (i.e., from Guyana to northern Brazil), although this needs to be verified. Future sampling efforts are needed between the US and southern Brazil to understand the limits of the populations these two regions harbor, whether other differentiated populations are present across the blue crab range, and what factors may be associated with genetic differentiation.…”

New record of blue swimming crab Callinectes sapidus Rathbun, 1896 (Crustacea: Portunidae) for the state of Rio Grande do Norte, Northeastern Brazil

“…In addition, this is the only species of its genus which, apparently, presents a disjoint distribution pattern for the Western Atlantic, according to literature records: reports show occurrence in coastal regions from the United States to Venezuela, northern coast of South America and also along the southern South American coast, with occasional records in the states of Pernambuco and Alagoas, and a continuous band from the state of Bahia to Argentina (Williams 1974;Pereira-Barros 1981;Coelho and Santos 2004;Santos and D'Incao 2004). Recently, Rosa (2013) added a new record for C. sapidus, filling a gap in the distribution of the southern portion of South America (Alagoas to Bahia), in the Brazilian state of Sergipe, in the upper estuary of the Rio Sergipe.…”

Checklist of the marine and estuarine Brachyura (Crustacea: Decapoda) of northern and northeastern Brazil

“…Nine species are classified as disjunct (e.g., Acanthocarpus alexandri, Arenaeus cribrarius, Hexapanopeus angustifrons, and Tumidotheres maculatus). Although introduced in other parts of the world (Williams 1974), Callinectes sapidus is included within this group because this portunid shows a disjunct distribution in the western Atlantic, with a northern group occuring from Virginia to Venezuela; and a southern group ranging from Alagoas (Brazil) to Argentina (Williams 1974;Melo 1996;Santos & D'Incao 2004).…”