Community dynamics of Pleistocene coral reefs during alternative climatic regimes.
Community dynamics of Pleistocene coral reefs during alternative climatic regimes.
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不同气候条件下更新世珊瑚礁的群落动态。
DOI：
10.1890/08-0422.1
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发表时间：
2010
期刊：
影响因子：
4.8
通讯作者：
J. Pandolfi
中科院分区：
文献类型：
--
作者：
Danika Tager;J. Webster;D. Potts;W. Renema;J. Braga;J. Pandolfi
在更新世海平面上升的连续时期建立的珊瑚礁生态系统中，珊瑚群落结构表现出显着的持久性，但鲜为人知的是，在低海平面或海平面福尔斯下降期间的珊瑚礁群落的生态特征。我们采样的珊瑚，底栖有孔虫，和石灰质红藻群落的相对物种丰度从8个淹没在休恩湾，巴布亚新几内亚，在连续海平面下降和低水位期间在过去的约kyr。我们发现，珊瑚物种组成的差异显着增加，随着时间的推移，建礁事件。然而，无论是珊瑚的多样性，也没有底栖有孔虫和钙质红藻组合的分类组成随时间变化显着。珊瑚群落的分类组成从低位礁是显着不同的高位礁以前报道从附近的休恩半岛。我们解释的社区组成和时间动态的低水位珊瑚礁的结果，在休恩湾能源制度的转变，和低和高水位珊瑚礁之间的差异，由于休恩湾和休恩半岛之间的生物和环境因素之间的相互作用的差异。无论驱动这些趋势的确切过程，我们的研究代表了第一次瞥见珊瑚礁的生态动态在低海平面的立场时，珊瑚礁生长的气候条件是非常不同的，不如以前研究的高水位时期。
Reef ecosystems built during successive periods of Pleistocene sea level rise have shown remarkable persistence in coral community structure, but little is known of the ecological characteristics of reef communities during periods of low sea stands or sea level falls. We sampled the relative species abundance of coral, benthic foraminifera, and calcareous red algae communities from eight submerged coral reefs in the Huon Gulf, Papua New Guinea, which formed during successive sea level fall and lowstand periods over the past approximately kyr. We found that dissimilarity in coral species composition increased significantly with increasing time between reef-building events. However, neither coral diversity nor the taxonomic composition of benthic foraminifera and calcareous red algae assemblages varied significantly over time. The taxonomic composition of coral communities from lowstand reefs was significantly different from that of highstand reefs previously reported from the nearby Huon Peninsula. We interpret the community composition and temporal dynamics of lowstand reefs as a result of shifting energy regimes in the Huon Gulf, and differences between low and highstand reefs as a result of differences in the interaction between biotic and environmental factors between the Huon Gulf and Huon Peninsula. Regardless of the exact processes driving these trends, our study represents the first glimpse into the ecological dynamics of coral reefs during low sea level stands when climatic conditions for reef growth were much different and less optimal than during previously studied highstand periods.