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首页> 外文期刊>Marine ecology progress series >Effects of thermal stress on key processes driving coral-population dynamics
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Effects of thermal stress on key processes driving coral-population dynamics

机译：热应力对驱动珊瑚种群动态的关键过程的影响

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A primary goal of ecology is to understand population dynamics by quantifying key processes that regulate population densities through time. Change to any one process may alter the population trajectory, its genetic constitution, and its size-frequency distribution. This study sought to quantify which of the 5 processes -(1) recruitment, (2) post-settlement mortality, (3) growth, (4) partial mortality and (5) total colony mortality-most influenced corymbose Acropora coral-population dynamics on reefs in southern Japan. Here we tracked coral reef colonies at a windward site and a leeward site from 1996 to 2001 through a thermal anomaly (+1.8℃ in 1998). We were particularly interested in examining which of those processes had the largest effect on population dynamics. To predict size-frequency distributions, we constructed a system of nonlinear differential equations that included those 5 processes. Recruitment at the windward site remained consistent through time, whereas the leeward site had more variable recruitment rates at all depths, and showed a considerable decrease after the 1998 thermal anomaly that remained suppressed for many years. At all depths, the proportion of colonies transitioning to a larger size class was higher during the thermal anomaly than in other years. Partial mortality was generally highest on 20 to 30 cm length colonies, but was not a good indicator of thermal stress. Total colony mortality was most evident for the smallest and largest corymbose Acropora colonies during the thermal anomaly, effectively narrowing the size-frequency distributions. Sensitivity analyses revealed that total colony mortality had the largest effect on coral-population growth rate (λ), followed by post-settlement mortality and recruitment. Quantifying the population processes that lead to state changes is a prerequisite for understanding reef dynamics in a rapidly warming ocean.
机译：生态学的主要目标是通过量化调节人口密度的关键过程来了解人口动态。改变任何一个过程都可能改变种群轨迹，其遗传构成及其大小频率分布。这项研究试图量化5个过程中的哪一个-（1）募集，（2）安置后死亡率，（3）生长，（4）部分死亡率和（5）总菌落死亡率，受影响最大的ry鱼珊瑚藻种群动态在日本南部的珊瑚礁上。在这里，我们通过温度异常（1998年为+1.8摄氏度）追踪了1996年至2001年在上风向和下风向的珊瑚礁殖民地。我们特别感兴趣的是研究哪些过程对人口动态的影响最大。为了预测尺寸-频率分布，我们构建了包含这5个过程的非线性微分方程系统。随着时间的流逝，迎风部位的招募保持一致，而背风部位的各个深度的招募率变化更大，并且在1998年热异常之后，招募率显着下降，并且多年来一直受到抑制。在所有深度，热异常期间过渡到较大尺寸类别的菌落比例均高于其他年份。通常，在20至30 cm长的菌落上，局部死亡率最高，但并不是热应激的良好指标。在热异常过程中，最小和最大的ry形棘足动物菌落的总菌落死亡率最明显，有效地缩小了大小-频率分布。敏感性分析表明，总菌落死亡率对珊瑚种群的增长率（λ）影响最大，其次是定居后的死亡率和募集。量化导致状态变化的种群过程是了解迅速变暖的海洋中珊瑚礁动态的先决条件。

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