Ciclo reprodutivo e flutuação anual da população de Janaira gracilis (Crustacea, Isopoda, Asellota)

The life cycle and seasonal population changes of Janaira gracilis Moreira & Pires, is studied in detail. J. gracilis is the most common isopod of the phytal fauna of Sargasswn cymosum from Praia do Lamberto, Ubatuba, State of São Paulo (23º30'S and 45º07'W). The samples were collected...

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Bibliographic Details
Author: Pires, Ana Maria Setubal
Format: article
Status:Published version
Publication Date:1977
Country:Brasil
Institution:Instituto Oceanográfico da Universidade de São Paulo (IOUSP)
Repository:Boletim do Instituto Oceanográfico
Language:Portuguese
OAI Identifier:oai:revistas.usp.br:article/39834
Online Access:https://revistas.usp.br/biocean/article/view/39834
Access Level:Open access
Description
Summary:The life cycle and seasonal population changes of Janaira gracilis Moreira & Pires, is studied in detail. J. gracilis is the most common isopod of the phytal fauna of Sargasswn cymosum from Praia do Lamberto, Ubatuba, State of São Paulo (23º30'S and 45º07'W). The samples were collected once a month from January 1972 to January 1973. The data show a reproductive period continuous throughout the year with two peaks of major reproductive intensity. It is also discussed the populations characteristics and the sex ratio fluctuations.