Growth and spatial distribution of Cassidulus mitis (Echinodermata: Echinoidea) on a sandy beach in Southeastern Brazil
| Autor: | R. A. O. Magalhaes, Paulo J. P. Santos, Nelson Ferreira Fontoura, P. A. Grohmann, C. A. Freire |
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| Rok vydání: | 1992 |
| Předmět: |
chemistry.chemical_classification
Hydrology education.field_of_study Ecology biology Population Aquatic Science Von bertalanffy biology.organism_classification Spatial distribution Population density chemistry Dominance (ecology) Organic matter Cassidulus mitis education Ecology Evolution Behavior and Systematics Sex ratio |
| Zdroj: | Marine Biology. 112:625-630 |
| ISSN: | 1432-1793 0025-3162 |
| DOI: | 10.1007/bf00346180 |
| Popis: | Using a hand dredge, a population of Cassidulus mitis Krau, 1954 was sampled monthly from February 1986 to January 1987 at 15 stations offshore from Vermelha Beach (22°57′18″ S; 43°9′48″ W), in water depths ranging from 0 to 6 m. The sex ratio indicated a slight numerical dominance of females for adults and a larger numerical female dominance for juveniles. A von Bertalanffy growth curve was estimated as L=71.00 (1-e(-0.390t)), where L=length (mm) and t=time (yr). The instantaneous natural mortality rate (M) was estimated as 0.812. The population occupies a zone parallel to the beach, and displays a spatially aggregated pattern, with higher densities in areas characterized by coarse and very well sorted sand containing low amounts of organic matter. |
| Databáze: | OpenAIRE |
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