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首页> 外文期刊>Marine ecology progress series >Recruitment failure and shifts in community structure following mass mortality limit recovery prospects of black abalone
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Recruitment failure and shifts in community structure following mass mortality limit recovery prospects of black abalone

机译：大规模死亡后的招聘失败和社区结构转变限制了黑鲍鱼的恢复前景

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ABSTRACT: Mass mortalities of species can fundamentally alter the structure of natural communities, which can in turn negatively impact species’ recovery. Beginning in 1994, some of the largest remaining populations of black abalone Haliotis cracherodii on the mainland coast of California, experienced mass mortalities due to the fatal disease called ‘withering syndrome’, which led to its listing as a species of concern by the USA National Marine Fisheries Service. We have been monitoring black abalone populations along the coast of southern and central California since 1992, and detection of withering syndrome at our southernmost site prompted us to investigate how the impending decline of this dominant grazer might correlate with changes in black abalone recruitment and the rocky intertidal community in which it lives. Quantitative surveys before and after mass mortalities revealed that, after black abalone declined, there was a shift in the composition of the intertidal species assemblage from one dominated by bare rock and crustose coralline algae (good quality abalone habitat) to one with increased cover of sessile invertebrates and sea urchins. Declines in abalone abundance were also correlated with a lack of recruitment to areas affected by withering syndrome, despite the presence of healthy adult populations only tens of kilometers away. This suggests that abalone recruitment might be limited by dispersal, a lack of quality habitat for settlement and early survival, or the continued presence of the disease agent. Recruitment failure and these dramatic shifts in habitat quality indicate that the outlook for recovery of black abalone is poor.
机译：摘要：物种的大量死亡可以从根本上改变自然群落的结构，进而对物种的恢复产生负面影响。从1994年开始，加利福尼亚大陆沿海剩余的最大数量的黑鲍鱼（I> Haliotis cracherodii ）因致命疾病“枯萎综合征”而致死，这使其被列为美国国家海洋渔业局关注的物种。自1992年以来，我们一直在监视加利福尼亚南部和中部沿海地区的黑鲍鱼种群，在我们最南端的地点检测到枯萎综合症，促使我们调查了这种优势食草动物即将到来的衰落可能与黑鲍鱼招募和岩石变化有关它所生活的潮间带社区。大规模死亡前后的定量调查显示，在黑鲍鱼数量下降之后，潮间带物种组合的组成发生了变化，从一种以裸露的岩石和甲壳类珊瑚藻为主的高质量的鲍鱼栖息地（一种优质的鲍鱼栖息地）转变为一种无柄覆盖的物种。无脊椎动物和海胆。尽管只有数十公里之遥的健康成年人口，但鲍鱼丰度的下降也与缺乏受枯萎综合征影响的地区有关。这表明鲍鱼的招募可能受到散布，缺乏定居和早期生存的优质生境或疾病因子持续存在的限制。招聘失败和栖息地质量的这些巨大变化表明，黑鲍鱼的恢复前景不佳。

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