DOI: https://doi.org/10.51189/rema/1113May 5, 2021Proceedings Paper

MATURIDADE SEXUAL FISIOLÓGICA DAS FÊMEAS DO CARANGUEJO-TERRESTRE JOHNGARTHIA LAGOSTOMA (H. MILNE EDWARDS, 1837) (CRUSTACEA: BRACHYURA: GECARCINIDAE), NA ILHA DA TRINDADE, BRASIL

NICHOLAS KRIEGLERLETÍCIA STELA BISPO DA SILVA

Abstract

Introdução: O caranguejo-terrestre Johngarthia lagostoma é endêmico de ambientes insulares e restringe sua distribuição a quatro ilhas do Oceano Atlântico. Devido sua distribuição limitada e crescente exploração antrópica é considerada sob ameaça de extinção, o que intensifica preocupações sobre sua biologia populacional e reprodutiva. Objetivo: Com isso, o presente estudo estimou o tamanho de maturidade sexual fisiológica das fêmeas de Johngarthia lagostoma, por análise macroscópica gonadal. Materiais e métodos: Um total de 117 fêmeas foram coletadas manualmente entre os meses de fevereiro a abril/ 2019 e dezembro/2019 a fevereiro/ 2020. Cada indivíduo foi individualizado em embalagens plásticas e crioanestesiados em freezer para posterior análise. Em laboratório os exemplares tiveram seu tamanho corpóreo medido (LC, largura cefalotorácica, em mm) com paquímetro de precisão (0,05 mm) e dissecadas para avaliação do estágio de maturação macroscópica das gônadas (maturidade fisiológica), quando foram categorizados como imaturos (IM), em maturação (EM) e maturos (MA). Os exemplares jovens foram considerados com as gônadas IM, enquanto os adultos foram aqueles com gônadas EM e MA. A proporção entre estas categorias foi calculada em...Continue Reading

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