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首页> 外文期刊>oecologia >Multiple density dependence in two sub-populations of the amphipodMonoporeia affinis: a potential for alternative equilibria
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Multiple density dependence in two sub-populations of the amphipodMonoporeia affinis: a potential for alternative equilibria

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Possible mechanisms for differences in population densities and dynamics were investigated in the amphipodMonoporeia affinisat two deep sites in the northern Bothnian Sea. The two sites were sampled yearly for 10 years. Average sizes, growth and mortality of the different age-classes were estimated from the cohort structure of the two populations. Laboratory experiments also investigated the ability of the common predatory isopodSaduria entomonto cause densitydependent (DD) mortality of the preyM. affinis. At site A, 43 m depth, the average density ofM. affiniswas twice as high as at site B, 81 m depth. The fluctuations in density were asynchronous between the two sites. Recruitment and subadult sizes ofMonoporeia affiniswere density dependent at both sites. The main functional difference between the two populations seemed to be the DD mortality of the 1 + cohort that occurred only at the low-density site B. A corresponding DD mortality was found in the predation experiments at densities of 1 +m. affiniscorresponding to those found at site B. The potential importance of the predator was also indicated by a significant negative correlation between the biomass ofS. entomonand the rate of change inM. affinisdensity in the field. The similarities in the abiotic factors between the two sites suggested that differences in carrying capacity should be small. The results could be explained by the predation regulation hypothesis for the low-density population at site B, while at site AM. affinisseemed to be regulated by intra-specific competition and limited by predation. It is suggested that in this simple predator-prey system there is potential for the existence of alternative equilibria.

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    《oecologia》 |1994年第1期|26-34|共页
  • 作者

    KjellLeonardsson;

  • 作者单位

    University of Umeå;

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