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首页> 外文期刊>Marine ecology progress series >Immediate and delayed effects of a mass mortality event on gorgonian population dynamics and benthic community structure in the NW Mediterranean Sea
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Immediate and delayed effects of a mass mortality event on gorgonian population dynamics and benthic community structure in the NW Mediterranean Sea

机译：大规模死亡事件对西北地中海沿岸种群动态和底栖生物群落结构的即时和延迟影响

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In the boreal summer of 1999, many invertebrates of hard-bottom communities in the NW Mediterranean Sea suffered mass mortality. Our study assessed the population of the temperate octocoral Paramuricea clavata before the event and monitored the population over the following 4 yr. Spatial patterns showed decreasing mortality with increasing depth between 0 and 50 m, as well as high local variability. The temporal pattern was characterized by a sharp decrease in biomass (58%) shortly after the event caused by the combined effect of colony death (9% of the population) and an increase in the extent of colony injury (from 9% before the event to 52% shortly after it). After 4 yr of monitoring, our results indicated a large delayed effect of the event. Population density decreased continuously after November 1999, and by the completion of the study in November 2003 the accumulated density decrease was 48% of the initial population. This decrease was mainly due to the death of colonies subjected to extensive injury, and because recruitment did not offset mortality. After November 1999, biomass continued to decrease at a slow rate, becoming almost constant after November 2001. Overall, the delayed effect of the event accounted for a 70% loss in P. clavata biomass. The fact that a stabilization of the density and biomass of this species was observed during the last year of our study suggests that the delayed impact of the 1999 mass mortality event may be near-ing its end. Nevertheless, given the low dynamics of P. clavata and its role as a habitat former, the delayed effect of the mass mortality event indicates the relevant role that disturbance can play on the population dynamics of this species and as a community structuring force on the coralligenous community.
机译：在1999年的夏季，西北地中海地区许多无底栖动物的无脊椎动物遭受大规模杀害。我们的研究在事件发生之前评估了温带八角副腔蛤lava的种群，并在接下来的4年中监测了种群。空间模式显示死亡率随着0至50 m之间深度的增加而降低，并且局部变异性较高。时间格局的特征是，在事件发生后不久，由于菌落死亡（占人口的9％）的综合影响，生物量急剧下降（58％），而菌落损伤的程度有所增加（从事件发生前的9％）到紧随其后的52％）。经过4年的监测，我们的结果表明该事件的延迟较大。人口密度在1999年11月之后持续下降，到2003年11月研究结束，累积密度下降了初始人口的48％。减少的主要原因是遭受严重伤害的菌落死亡，以及募集并不能抵消死亡率。 1999年11月之后，生物量继续以缓慢的速度减少，到2001年11月之后几乎保持不变。总体而言，该事件的延迟影响造成了C. clavata生物量损失70％。在我们研究的最后一年中观察到该物种的密度和生物量稳定的事实表明，1999年大规模死亡事件的延迟影响可能即将结束。然而，鉴于P. clavata的低动态性及其作为生境形成者的作用，大规模死亡事件的延迟影响表明扰动可对该物种的种群动态以及作为对珊瑚源性的群落结构作用的相关作用。社区。

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