7 A Deglacial Cold-Water Coral Boom in the Alborán Sea: From Coral Mounds and Species Dominance

7 A Deglacial Cold-Water Coral Boom in the Alborán Sea: From Coral Mounds and Species Dominance
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7 阿尔沃兰海的冰消期冷水珊瑚繁荣:来自珊瑚丘和物种优势

DOI:
10.1007/978-3-319-91608-8_7
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发表时间:
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期刊:
Mediterranean Cold-Water Corals: Past, Present and Future
影响因子:
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通讯作者:
Wienberg C
Wienberg C
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作者:
Wienberg C

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两种硬壳纲的冷水珊瑚——白桦珊瑚(slophelia pertusand)和珊瑚珊瑚(madrepora culatata)广泛分布于Alborán海。它们在海底山、火山脊和泥火山上被发现(活的和化石的),它们在过去的地质时期形成了珊瑚丘。而冷水珊瑚减少发生在上次冰河时代,他们经历了繁荣自上次冰川的消失,直到全新世早期。在此期间,冷水珊瑚的增殖表现为非常高的垂直丘堆积率,达到100 - 400 cm kyr−1。自中全新世以来,珊瑚丘的沉积明显减缓,这可能是由于冷水珊瑚的减少,可能是由于沉积物供应的减少。在全新世期间,珊瑚物种优势向aM转移。以眼珊瑚为主的冷水珊瑚群落变得明显。据推测,与l。pertusa, M。尤卡塔对不断上升的全新世海底水温具有更高的耐受性,但由于其分支结构薄,在堆积土墩方面效率不高。
The two scleractinian cold-water coralsLophelia pertusaandMadrepora oculataare widely distributed in the Alborán Sea. They have been found (alive and fossil) on seamounts, volcanic ridges and mud volcanoes, and they formed coral mounds in the geological past. While the cold-water corals show a reduced occurrence during the last glacial period, they experienced a boom since the last deglaciation until the Early Holocene. The proliferation of cold-water corals during this time is expressed in very high vertical mound aggradation rates of >400 cm kyr−1. Since the mid-Holocene coral mound aggradation significantly slowed-down, which is ascribed to the reduced occurrence of cold-water corals likely supplemented by a reduced sediment supply. During the Holocene, a shift in coral species dominance towards aM. oculata-dominated cold-water coral community becomes apparent. It is speculated that in comparison toL. pertusa,M. oculatahas a higher tolerance against the increasing Holocene bottom water temperatures, but is not efficient in building-up mounds likely attributed to its thinly branching framework.
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发表时间: 2016
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