Models test in the evaluation of Cyathura carinata growth

Abstract

Previous studies on the Ria Formosa (southern Portugal) benthic communities have shown that Cyathura carinata (Krøyer, 1847) is a common and abundant species, with a key role in food web transfers as a prey for birds and fish. The aim of the present study was to describe its life cycle, population dynamics and productivity. Samples of Cyathura carinata (Isopoda), taken in 388^th days in the intertidal zone of the Ria Formosa lagoon yielded mean annual densities of 213 individuals/m². Analysis of population density values in the Ria Formosa in comparison with other estuaries indicates that this species exhibits a regular year-round distribution pattern, independent of geographic location. Using modal progression analysis of the six cohorts identified, the life span of Ria Formosa C. carinata was estimated at approximated 19 months. The recruitment period ranged from mid-April to October and three new cohorts were recognized.

Keywords: Intertidal community, dynamic mode, Cyathura carinata.