Density-associated recruitment mediates coral population dynamics on a coral reef
Density-associated recruitment mediates coral population dynamics on a coral reef
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DOI：
10.1007/s00338-016-1413-4
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发表时间：
2016-06-01
期刊：
影响因子：
3.5
通讯作者：
Edmunds, Peter J.
中科院分区：
文献类型：
--
作者：
Bramanti, Lorenzo;Edmunds, Peter J.
理论表明，密度相关的过程可以调节人口规模下降后的社区弹性。在这里，我们展示了密度相关的过程中的两个石珊瑚种群的外礁的莫雷阿，法属波利尼西亚，这是迅速增加的规模以下两个灾难性的干扰的影响。2006年至2010年，珊瑚虫棘冠海星星的捕食使珊瑚覆盖率下降了93%; 2010年，死亡的珊瑚骨骼被飓风带走，2011年和2012年，珊瑚的大量补充使珊瑚数量开始恢复。珊瑚招聘与珊瑚覆盖，但两个珊瑚属，几乎完全广播产卵在莫雷阿岛之间的关系不同。Acroporids在低密度下招募，招募密度与Acropora的覆盖呈正相关，而Pocilloporids在高密度下招募，其招募密度与Pocillopora的覆盖呈负相关。总之，我们的研究结果表明，成年覆盖和密度的青少年和新兵之间的关联可以调解珊瑚群落的快速恢复后，大的干扰。招聘密度和珊瑚覆盖之间的关系的标志分类群之间的差异表明，它们反映了对比机制，有可能调解珊瑚群落的分类组成的时间变化。
Theory suggests that density-associated processes can modulate community resilience following declines in population size. Here, we demonstrate density-associated processes in two scleractinian populations on the outer reef of Moorea, French Polynesia, that are rapidly increasing in size following the effects of two catastrophic disturbances. Between 2006 and 2010, predation by the corallivorous crown-of-thorns sea star reduced coral cover by 93 %; in 2010, the dead coral skeletons were removed by a cyclone, and in 2011 and 2012, high coral recruitment initiated population recovery. Coral recruitment was associated with coral cover, but the relationship differed between two coral genera that are almost exclusively broadcast spawners in Moorea. Acroporids recruited at low densities, and the density of recruits was positively associated with cover of Acropora, whereas pocilloporids recruited at high densities, and densities of their recruits were negatively associated with cover of Pocillopora. Together, our results suggest that associations between adult cover and density of both juveniles and recruits can mediate rapid coral community recovery after large disturbances. The difference between taxa in sign of the relationships between recruit density and coral cover indicate that they reflect contrasting mechanisms with the potential to mediate temporal shifts in taxonomic composition of coral communities.