Dinâmica populacional do camarão escavador Neocallichirus maryae Karasawa, 2004 na Praia de Mangue Seco, Igarassu - PE

Abstract

The aim of this study is provide the first informations about the population structure and relative growth of the species, on a beach of north coast of Pernambuco. The samples were made with help of a “yabby pump”, between September 2018 and October 2019. The specimens were mensured about the Cephalotorax Lenght (CF), Total Length (CT), Major Propodus Cheliped Lenght (CP), Major Propodus Width (LP), Major Propodus Height (AP), Major Carpus Cheliped Lenght (CC) and Major Carpus Cheliped Height (AC). A total of 559 individuals were collected, 219 males and 358 females, where 46 were ovigerous. The sexual maturity was reached at A maturidade sexual 9mm of CF for both sexes. Only for the general population and between adults the sex ratio was significantly female-biased (p<0,0001). The smallest ovigerous female presented A 9,37 mm of CF and the biggest presented 16,48 mm of CF. The major and minor collected animal were females. The most part of ovigerous females (36 specimens) carried uneyed embryos. For both sexes, the analyses of relative growth showed positive allometry for the relationships CFxCP, CFxLP, CFxAP and CFxAC. For the relationship CFxCC, females presented negative allometry and males presented positive allometry. Both sexes presented isometry for the relationship CFxCT. The female-biased sex ratio may have been due to the fact that they are positioned in more superficial layers of sediment for oxigenation of the egg mass, corroborating with the peak of ovigerous females collected. We emphasize the uniqueness of the findings, highlighting the relevance of results to fill the large gap of knowledge about the species.