A juvenile recruitment prediction model for Ruditapes decussatus (L.) (Bivalvia : Mollusca)

Chícharo, Luís; Chicharo, Maria Alexandra Teodosio

http://hdl.handle.net/10400.1/2386

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Authors

Chícharo, Luís

Chicharo, Maria Alexandra Teodosio

Abstract(s)

Despite the importance of larval abundance in determining the recruitment of benthic marine invertebrates and as a major factor in marine benthic community structure, relating planktonic larval abundance with post-settlement post-larvae and juveniles in the benthos is difficult. It is hampered by several methodological difficulties, including sampling frequency, ability to follow larval and post-larval or juvenile cohorts, and ability to calculate growth and mortality rates. In our work, an intensive sampling strategy was used. Larvae in the plankton were collected at weekly intervals, while post-larvae that settled into collectors were analysed fortnightly. Planktonic larval and benthic post-larval/juvenile cohorts were determined, and growth and mortality rates calculated. Integration of all equations allowed the development of a theoretical formulation that, based on the abundance and planktonic larval duration, permits an estimation of the future abundance of post-larvae/juveniles during the first year of benthic life. The model can be applied to a sample in which it was necessary only to measure larval length.

Keywords

Ruditapes decussatus Bivalve larvae Larval recruitment Growth Mortality Recruitment model

URI

http://hdl.handle.net/10400.1/2386

Citation

Chicharo, L. M. Z.; Chicharo, M. A. A juvenile recruitment prediction model for Ruditapes decussatus (L.) (Bivalvia : Mollusca), Fisheries Research, 53, 3, 219-233, 2001.