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首页> 外文期刊>Marine ecology progress series >Mortality rates of small juvenile crown-of-thorns starfish Acanthaster planci on the Great Barrier Reef: implications for population size and larval settlement thresholds for outbreaks
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Mortality rates of small juvenile crown-of-thorns starfish Acanthaster planci on the Great Barrier Reef: implications for population size and larval settlement thresholds for outbreaks

机译：大堡礁上小型棘刺海星棘棘海星Acanthaster planci的死亡率：对种群规模和爆发的幼体定居阈值的影响

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摘要

Crown-of-thorns starfish Acanthaster planci are a significant predator of scleractinian corals, with outbreak populations continuing to impose large-scale mortality on coral reef communities. We measured mortality rates of small post-settlement juvenile A. planci in a caging experiment on the Great Barrier Reef. Starfish 3 mm in diameter suffered mortality rates of 2.6% d(-1), of which 73.0% was attributed to mobile predators. Starfish 13 mm in diameter had a lower rate of mortality of 0.82% d(-1). There were no differences in mortality rates between sites, and localised effects, such as the presence of specific predators like the shrimp Hymenocera sp., affected within-site variability in mortality rates. The coral rubble habitat where the experiments were conducted had a large suite of generalist putative predators including both fish and invertebrates. The results from this and previously published studies were used to develop a model of size-and age-dependent mortality, which, when applied with the commonly accepted destructive outbreak threshold for adult A. planci of 10 ha(-1) at age 2.5 yr, would require larval settlement rates of 5 m(-2). Parameterising the magnitude of likely settlement rates and rates of post-settlement mortality provides a significant advance in understanding and modelling the population dynamics of this important coral predator.
机译：荆棘冠海星Acanthaster planci是scleractinian珊瑚的重要捕食者，暴发种群继续对珊瑚礁群落造成大规模死亡。我们在大堡礁的笼养实验中测量了小型定居后未成年A. planci的死亡率。直径3毫米的海星的死亡率为2.6 d（-1），其中73.0％归因于移动掠食者。直径13毫米的海星死亡率较低，为0.82％d（-1）。站点之间的死亡率没有差异，而且局部影响（例如，虾类Hymenocera sp。等特定天敌的存在）影响了站点内死亡率的变异性。进行实验的珊瑚瓦砾生境有大量的通才动物，包括鱼类和无脊椎动物。从这项研究和先前发表的研究中得出的结果用于建立一个与年龄和年龄有关的死亡率的模型，该模型与2.5岁的成年A.planci的10 ha（-1）成年人普遍接受的破坏性爆发阈值一起应用时， ，将需要5 m（-2）的幼虫沉降率。对可能的定居率和定居后死亡率的大小进行参数化设置，可以在理解和建模这一重要珊瑚捕食者种群动态方面取得重大进展。

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