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首页> 外文期刊>Marine ecology progress series >Tissue loss rather than colony size determines the demographic fate of the branching coral Acropora cervicornis
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Tissue loss rather than colony size determines the demographic fate of the branching coral Acropora cervicornis

机译：组织损失而不是菌落大小决定了分支珊瑚Acropora cervicornis的人口统计学命运

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Partial mortality is a common process affecting coral colonies. Yet, the impact of tissue loss on the demography of the threatened reef-building coral Acropora cervicornis has been poorly investigated. This limits our understanding of how this species will fare under unfavorable environmental conditions. In this study, we examined the growth and survival of colonies with varying degrees of partial mortality, indicated by tissue loss, for 2 yr at 2 reefs in Puerto Rico. We found that irrespective of colony size, rates of coral growth and survival declined significantly once the proportion of dead tissue exceeded 20% of the total colony size. Projections of state matrix population models indicated that partial mortality could also have a negative impact at the population level. For instance, a 25% increase in the number of colonies with 20% tissue loss would reduce the time in which 75% of the population is lost by 3 to 4 yr. Our results provide a new perspective on the effect of partial mortality on the demography and population dynamics of A. cervicornis. First, 20% of tissue loss can be considered a threshold value in which colony fate and population growth are compromised. Second, colony size is not the most important determinant of a colony's demographic performance; instead, the surface area lost to partial mortality is a better predictor of colony growth and survivorship. Taking into consideration the relationship between partial mortality and the demographic fate of A. cervicornis can aid in the development of stronger conservation and restoration programs.
机译：部分死亡是影响珊瑚群落的常见过程。但是，组织损失对濒临灭绝的造礁珊瑚鹿角珊瑚（Acropora cervicornis）的人口统计的影响尚未得到充分研究。这限制了我们对这个物种在不利的环境条件下如何生存的理解。在这项研究中，我们检查了波多黎各在2个礁石上具有2年不同部分死亡率（以组织损失表示）的菌落的生长和存活情况。我们发现，无论死菌大小如何，一旦死亡组织的比例超过总菌落大小的20％，珊瑚的生长和存活率就会明显下降。对州矩阵人口模型的预测表明，部分死亡率也可能对人口水平产生负面影响。例如，菌落数量增加25％，组织损失> 20％，将使75％的人口丧失3至4年的时间减少。我们的研究结果为部分死亡对宫颈癌的人口统计学和种群动态的影响提供了新的视角。首先，可以将20％的组织损失视为阈值，在该阈值中会影响菌落的命运和种群增长。其次，殖民地的规模并不是决定殖民地人口统计学表现的最重要因素。取而代之的是，由于部分死亡而损失的表面积更好地预测了菌落的生长和存活。考虑到部分死亡与宫颈曲霉的人口命运之间的关系，可以帮助制定更强有力的保护和恢复计划。

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