|Distribution and production of the polychaete Nereis diversicolor in a shallow coastal lagoon in the Bay of Cadiz (SW Spain)|
Arias, A.M.; Drake, P. (1995). Distribution and production of the polychaete Nereis diversicolor in a shallow coastal lagoon in the Bay of Cadiz (SW Spain). Cah. Biol. Mar. 36(3): 201-210
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
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The temporal and spatial distribution and production of Nereis diversicolor in a semi-natural lagoon system were studied by taking monthly samples at 4 sites during two years. The numerical abundance and biomass, with mean annual estimates of 1886 ind. m super(-2) and 4.6 g AFDW. m super(-2) respectively for the whole studied system, showed considerable inter-season and intersite variations. The lowest N. diversicolor density was recorded at the most confined lagoonal area. Seasonal patterns for the numerical abundance, although showing some differences among sites, had main annual peaks in late autumn-early winter and in late spring-early summer. The studied population showed a prolonged recruitment period, with maxima in late spring and late autumn, and overlapping cohorts. The growth in width, with annual mean growth rates between 0.008 and 0.010 mm d super(-1), showed considerable seasonal oscillations. Using the size-frequency method, the mean annual production and production/biomass ratio (P/B) for the system were estimated to be 22.7 g AFDW. m super(-2).yr super(-1) and 4.9 respectively.