Life history and production of Capitella capitata (Polychaeta: Capitellidae) in Río de la Plata Estuary (Argentina)

Martin, J.P. and Bastida, R. (2006) Life history and production of Capitella capitata (Polychaeta: Capitellidae) in Río de la Plata Estuary (Argentina). Thalassas, 22(2), pp. 25-38.

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Abstract

A benthic survey was carried out from November 1998 to December 1999 in the tidal flats of Bahía Samborombón (Río de la Plata estuary, Argentina), in order to study the population structure, reproductive aspects, growth and secondary production of Capitella capitata (Fabricius, 1780). Growth was analyzed using ELEFAN routine, and the secondary production was estimated by Hynes and Coleman's method (1968). C. capitata did not present periods of very important recruitments throughout the year; however, the abundance of smallest size classes was higher during summer and autumn. The summer cohort showed a growth rate (K) of 2.05 and a seasonal growth oscillation (C) of 0.6, pointing out that worms grew very slowly during winter months. The life span of this cohort was 13 months. The autumn cohort showed a lower growth rate (K= 1.5) and its growth was lowest during winter. The life span was 15 months for this cohort. C. capitata in Punta Rasa presented an extended reproductive period, with absence of activity during winter months. The type of eggs and larvae suggest that C. capitata has benthic larval development in the study area, destining its reproductive effort to the production of a low number of eggs, and assuring larvae survival through incubation in brooding tubes. The annual mean biomass in Punta Rasa was 0.117 g m-2 (AFDW), with a mean secondary production of 0.23 g m-2 y-1 and a P/B ratio of 1.96 y-1. The relatively low density, biomass production and P/B ratio of C. capitata in Punta Rasa can be considered as reference values for this species inhabiting undisturbed or moderately disturbed areas.

Item Type: Article
Title: Life history and production of Capitella capitata (Polychaeta: Capitellidae) in Río de la Plata Estuary (Argentina)
Personal Creator/Author:
CreatorsEmail
Martin, J.P.martin_jpablo@yahoo.com.ar
Bastida, R.
Refereed: Yes
Journal or Publication Title: Thalassas
Volume: 22
Number: 2
Page Range: pp. 25-38
Date: 2006
Issuing Agency: Universidad Nacional de Mar del Plata
Subjects: Aquaculture
Biology
Oceanography
Item ID: 10032
Depositing User: Michelle Leonard
Date Deposited: 25 Sep 2012 19:07
Last Modified: 03 Apr 2014 02:31
URI: http://aquaticcommons.org/id/eprint/10032

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