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Quantifying life history demographics of the scleractinian coral genus Pocillopora at Palmyra Atoll
Coral Reefs ( IF 2.7 ) Pub Date : 2020-05-02 , DOI: 10.1007/s00338-020-01940-8
Sho M. Kodera , Clinton B. Edwards , Vid Petrovic , Nicole E. Pedersen , Yoan Eynaud , Stuart A. Sandin

Characterizations of colony-specific fate are necessary to predict trajectories of coral population change accurately, and a research challenge exists to collect more robust data describing coral demographic rates and the factors that influence them. Colonial, reef-building corals present challenges to the study of demography, given that the size of individual colonies can be decoupled from age, and rates of colony growth and shrinkage can be effectively indeterminate. In this study, we use a large-area imaging approach to quantify demographic rates of the coral genus Pocillopora and test for the influence of colony-specific predictors on net change in live tissue area (labeled growth and shrinkage) and whole-colony mortality. We found that a colony’s fate was linked to its initial size, with larger colonies experiencing far lower probability of mortality, but higher probability of shrinkage, than smaller colonies. Historical effects also significantly affected colony fate, as colonies with a recent history of tissue loss experienced a higher probability of subsequent shrinkage and mortality the following year. Finally, significant variability in growth and mortality rates was linked to intra-island site differences, which we hypothesize may be driven by differences in food availability and heterotrophic feeding rates. Our work highlights the importance of colony-specific characteristics, including size and historical effects, in influencing demographic fates of corals.

中文翻译:

量化帕尔米拉环礁石珊瑚属 Pocillopora 的生活史人口统计

特定群体命运的特征对于准确预测珊瑚种群变化的轨迹是必要的,并且存在一项研究挑战,即收集更可靠的数据来描述珊瑚人口统计率及其影响因素。鉴于个体殖民地的大小可以与年龄脱钩,并且殖民地的生长和收缩率可能实际上是不确定的,因此殖民地的造礁珊瑚对人口学研究提出了挑战。在这项研究中,我们使用大面积成像方法来量化珊瑚属 Pocillopora 的人口统计率,并测试群落特异性预测因子对活组织面积(标记的生长和收缩)和整个群落死亡率的净变化的影响。我们发现一个殖民地的命运与其最初的规模有关,与较小的菌落相比,较大的菌落的死亡概率要低得多,但收缩的概率更高。历史影响也显着影响了菌落的命运,因为最近有组织丢失史的菌落在接下来的一年中出现萎缩和死亡的可能性更高。最后,生长率和死亡率的显着变化与岛内地点差异有关,我们假设这可能是由食物供应和异养喂养率的差异驱动的。我们的工作强调了群体特定特征的重要性,包括大小和历史影响,在影响珊瑚的人口命运方面。因为最近有组织丢失史的菌落在接下来的一年中出现萎缩和死亡的可能性更高。最后,生长率和死亡率的显着变化与岛内地点差异有关,我们假设这可能是由食物供应和异养喂养率的差异驱动的。我们的工作强调了群体特定特征的重要性,包括大小和历史影响,在影响珊瑚的人口命运方面。因为最近有组织丢失史的菌落在接下来的一年中出现萎缩和死亡的可能性更高。最后,生长率和死亡率的显着变化与岛内地点差异有关,我们假设这可能是由食物供应和异养喂养率的差异驱动的。我们的工作强调了群体特定特征的重要性,包括大小和历史影响,在影响珊瑚的人口命运方面。
更新日期:2020-05-02
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