Caribbean corals exhibit species-specific differences in competitive abilities with an aggressive encrusting alga, Ramicrusta textilis
Caribbean corals exhibit species-specific differences in competitive abilities with an aggressive encrusting alga, Ramicrusta textilis
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DOI：
10.1007/s00338-021-02172-0
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发表时间：
2021-08
期刊：
影响因子：
3.5
通讯作者：
Karli J. Hollister;Rosmin S. Ennis;Heather L. Spalding;P. Gabrielson;T. Smith
中科院分区：
文献类型：
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作者：
Karli J. Hollister;Rosmin S. Ennis;Heather L. Spalding;P. Gabrielson;T. Smith
近几十年来，加勒比珊瑚覆盖面大幅减少，许多活珊瑚被大型藻类取代。在整个区域内，枝壳藻属的红藻已经变得非常丰富，并且已经证明了对珊瑚的广泛伤害，因为它们过度生长的活组织，导致群体死亡，并损害珊瑚的补充。在这项研究中，Ramicrusta textiliswas确定了形态解剖学和DNA测序从周围的9个地点圣托马斯，美属维尔京群岛，和三维摄影测量被用来测量藻类生长的速度在石珊瑚。3D模型的个别珊瑚殖民地（5种加控制，N= 72）竞争与R。textilisrevealed different competitive abilities between taxa，with Siderastrea sideabeing the only species capable of inhibit overgrowth by the taxa（means linear algae growth-1.1 mm yr-1）.重要的造礁珊瑚物种，如Orbicella annulament和Orbicella faveolata是较差的竞争对手（平均线性藻类生长+ 15毫米yr-1和+ 7.7毫米yr-1，分别），表明出现的珊瑚礁可能会对加勒比海珊瑚礁物种多样性，群落组成和结构复杂性产生重大影响。
Caribbean coral cover has decreased substantially in recent decades, with much of the live coral being replaced by macroalgae. Encrusting red algae in the genusRamicrustahave become abundant throughout the region and have demonstrated widespread harm to corals by overgrowing living tissue, causing colony mortality, and impairing coral recruitment. In this research,Ramicrusta textiliswas identified by morpho-anatomy and DNA sequencing from nine sites around St. Thomas, US Virgin Islands, and 3D photogrammetry was used to measure the rate of algal growth on stony corals. 3D models of individual coral colonies (five species plus controls,N= 72) competing withR. textilisrevealed differential competitive abilities among taxa, withSiderastrea sidereabeing the only species capable of inhibiting overgrowth by the alga (mean linear algal growth − 1.1 mm yr−1). Important reef building coral species such asOrbicella annularisandOrbicella faveolatawere poor competitors (mean linear algal growth + 15 mm yr−1and + 7.7 mm yr−1, respectively), indicating that the emergence of the alga could have significant impacts on Caribbean coral reef species diversity, community composition, and structural complexity.