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Effects of El Niño/Southern Oscillation on the population dynamics of a Gari solida population (Bivalvia: Psammobiidae) from Bahía Independencia, Peru

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Abstract

Population dynamics of a Gari solida (Gray, 1828) population from Bahía Independencia, Peru (14°S) was studied between November 1989 and February 1995 (except for 1991) in order to investigate the effects of the climate phenomenon El Niño/Southern Oscillation (ENSO) which occurred in 1992/93. Results indicate that ENSO had negative effects on gonad production in 1992, when temperatures were very high, and positive effects in 1993, when temperatures were lower, but the warm period lasted longer than in 1992. Higher reproductive output in 1993 was achieved by several spawning events in addition to the normal pattern. Growth rate in 1990 was higher (K=0.495) than in 1993/94 (K=0.346). A possible explanation could be that more energy was allocated to reproduction, and thus less surplus energy remained for growth. The negative effect of ENSO on production in 1992 is indicated by the low P/B ratio (0.298); in all other years P/B was consistently higher (1990: 0.570; 1993: 0.597; 1994: 0.597). From 1990 to 1994 a reduction of mean annual biomass from 189.3 to 14.4 g ash-free dry weight m-2 was also observed which may be related to fishery activities. The consistency of P/B ratio is best explained by the higher somatic production of the smaller individuals remaining after the larger individuals had been removed selectively by fishermen. Based on the results presented in this study and from the literature, a model is proposed depicting how ENSO may negatively affect bivalve populations. Two main factors are mentioned, increased temperature and reduction of assimilated energy.

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Authors and Affiliations

  1. Alfred-Wegener-Institut für Polar- und Meeresforschung, Columbusstr., D-27568, Bremerhaven, Germany

    H. -J. Urban

  2. Universidad Nacional de San Marcos, Casilla 1898, 100, Lima, Peru

    J. Tarazona

Authors
  1. H. -J. Urban
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  2. J. Tarazona
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Communicated by O. Kinne, Oldendorf/Luhe

Contribution No. 991 of the Alfred-Wegener-Institut für Polar- und Meeresforschung, Germany

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Urban, H.J., Tarazona, J. Effects of El Niño/Southern Oscillation on the population dynamics of a Gari solida population (Bivalvia: Psammobiidae) from Bahía Independencia, Peru. Marine Biology 125, 725–734 (1996). https://doi.org/10.1007/BF00349255

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  • DOI: https://doi.org/10.1007/BF00349255

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