High mortality during settlement is a population bottleneck for a tropical surgeonfish
High mortality during settlement is a population bottleneck for a tropical surgeonfish
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DOI：
10.1890/04-0366
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发表时间：
2004-09-01
期刊：
影响因子：
4.8
通讯作者：
Planes, S
中科院分区：
文献类型：
--
作者：
Doherty, PJ;Dufour, V;Planes, S
底栖海洋种群的补充通常涉及从浮游幼体到底栖幼体生境的“定居”。死亡率在这一过渡一直是未知的，因为难以测量繁殖体供应在开放的水域。三个星期，我们比较了夜间通过的定居鱼类的堡礁包围莫雷阿岛（法属波利尼西亚）与丰富的底栖动物新兵在第二天早上回礁泻湖。在这段时间里，超过40，000只定居的独角鱼，Naso unicornis进入了我们的研究区域，大约1公里（2），其中一半在两个晚上到达。使用耦合的Beverton-Holt函数来描述每个队列的衰减，我们能够预测新兵的每日丰度和他们的最终年龄结构的预安置输入。最好的模型估计，大约61%的潜在定居者在夜间到达和第二天早上之间消失，与队列大小无关。沉降后死亡率与密度有关，每天在9%和20%之间变化。我们将所有的死亡率归因于捕食，并认为与定居相关的高风险塑造了殖民策略。由于捕捞的目标是这一人口瓶颈的幸存者，水族馆渔业可能更可持续的时候，从中上层幼鱼来源。
Replenishment of benthic marine populations typically involves "settlement" from pelagic larval to benthic juvenile habitats. Mortality during this transition has been unknown because of the difficulty of measuring propagule supply in open water. For three weeks, we compared the nocturnal passage of presettlement fishes across the barrier reef encircling Moorea Island (French Polynesia) with the abundance of benthic recruits in the back-reef lagoon on the following morning. During, this time, >40,000 presettlement unicornfish, Naso unicornis entered our study area of similar to1 km(2) with half arriving on just two nights. Using coupled Beverton-Holt functions to describe the decay of each cohort, we were able to predict the daily abundance of recruits and their final age structure from the presettlement inputs. The best model estimated that similar to61% of the potential settlers were lost between their nocturnal arrival and the following morning, independent of cohort size. Postsettlement mortality was density dependent, varying between 9% and 20% per day. We attribute all mortality to predation and suggest that high risk associated with settlement has shaped colonization strategies. Because fishing targets the survivors of this population bottleneck, aquarium fisheries may be more sustainable when sourced from pelagic juveniles.