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首页> 外文期刊>Marine ecology progress series >Interactions in the canopy among Caribbean reef octocorals
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Interactions in the canopy among Caribbean reef octocorals

机译：八角珊瑚礁中冠层之间的相互作用

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摘要

The incidence of octocoral-octocoral interactions and the physical effects of the interactions were determined in surveys of 29 branching octocoral species at 2 sites in St. John, U.S. Virgin Islands. Close proximity, defined as the bases or branches of octocorals being within 5 cm of each other, creates the potential for direct competitive interactions. Cases of close proximity were common (63 and 34% of the colonies at the 2 sites), and were more abundant at the site with higher colony density and proportionately more colonies with tall, highly branched morphologies. Damaged branches associated with neighboring colonies were found in 19% of the colonies in close proximity. Eunicea flexuosa colonies exhibited less damage than the 5 most common species it interacted with (Antillogorgia americana, Eunicea mammosa, Gorgonia ventalina, Pseudoplexaura crucis, and Pseudoplexaura wagenaari). Of the colonies in close proximity, 23% featured asymmetric colony forms, representing the effects of competition through the preemption of canopy space. G. ventalina had the highest incidence of asymmetry. Nearest-neighbor analyses detected a weak but significant signal of competition in the combined sizes of neighboring colonies. Competition among octocorals in the canopy probably has limited effects on their spatial distribution, but tissue damage and altered colony form could affect growth and fitness.
机译：在美属维尔京群岛圣约翰的2个地点对29个分支的八齿物种进行了调查，确定了八齿-八齿相互作用的发生率和相互作用的物理效应。相近的距离定义为八齿形的基部或分支彼此之间在5厘米之内，这为直接竞争互动创造了潜力。紧密接近的情况很常见（在两个位置的菌落数量分别为63和34％），在该位置的菌落数量较多，菌落密度较高，并且具有较高，高度分支形态的菌落比例也更多。在邻近的19％菌落中发现了与邻近菌落相关的受损分支。屈叶Eunicea flexuosa菌落比与其相互作用的5个最常见物种（美洲Antillogorgia，Eumnica mammosa，Gorgonia ventalina，Pseudoplexaura crucis和Pseudoplexaura tennaari）受到的损害较小。在紧邻的殖民地中，有23％具有非对称的殖民地形式，这代表了通过冠层空间的抢占而产生的竞争效应。 G.ventalina不对称发生率最高。最近邻分析在相邻菌落的总大小中检测到了一个微弱但重要的竞争信号。冠层八叶虫之间的竞争对其空间分布的影响可能有限，但是组织损伤和集落形式的改变可能会影响生长和适应能力。

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