Modern deep-water agglutinated foraminifera from IODP Expedition 323, Bering Sea: ecological and taxonomic implications
Modern deep-water agglutinated foraminifera from IODP Expedition 323, Bering Sea: ecological and taxonomic implications
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白令海 IODP 第 323 次远征中的现代深水凝集有孔虫：生态和分类学意义
DOI：
10.1144/jmpaleo2016-026
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发表时间：
2017
影响因子：
2
通讯作者：
Kender S
中科院分区：
文献类型：
--
作者：
Kender S
尽管白令海对亚北极海洋学和气候的重要性，但对广阔的阿留申盆地的有孔虫知之甚少。我们报告的发生现代深水凝集有孔虫收集在7个站点的综合大洋钻探计划（IODP）考察323在白令海的核心。从岩心顶部采集的标本中，共鉴定出32属50种。常见的种类有典型的深水Rhizammina、Reophax、Rhabdammina、Recurvoides和Nodulina。来自北方地点的组合还包括附属的仙客来属、Eggerelloides和Glaphyrammina，而Bowers Ridge地点的组合包括其他管状属和Martinottiella。在所研究的溶解氧浓度最低的站点中，潜在的白令海特有的Eggerelloidessp。1栖息于初级生产力最高的北方山坡，以及潜在的特有种Martinottiellasp. 3栖息在鲍尔斯岭，其中有最低的氧气浓度，但相对较低的年生产力。3，在其测试表面上有开放的孔隙，以前曾在Bowers Ridge的上新世到最近的材料中报道过。尽管相对较小的样本量，生态限制可能意味着白令海经历了高生产力和减少氧气的时候，因为至少上新世。我们注意到的凝集有孔虫组合，这可能至少部分是由于盆地的限制，地质长时间的减少氧气，和高有机碳通量的部分地方性。我们的研究结果表明，从阿留申盆地收集进一步的表面样本数据的重要性。
Despite the importance of the Bering Sea for subarctic oceanography and climate, relatively little is known of the foraminifera from the extensive Aleutian Basin. We report the occurrence of modern deep-water agglutinated foraminifera collected at seven sites cored during Integrated Ocean Drilling Program (IODP) Expedition 323 in the Bering Sea. Assemblages collected from core-top samples contained 32 genera and 50 species and are described and illustrated here for the first time. Commonly occurring species include typical deep-waterRhizammina,Reophax,Rhabdammina,RecurvoidesandNodulina. Assemblages from the northern sites also consist of accessoryCyclammina,EggerelloidesandGlaphyrammina, whilst those of the Bowers Ridge sites consist of other tubular genera andMartinottiella. Of the studied stations with the lowest dissolved oxygen concentrations, the potentially Bering Sea endemicEggerelloidessp. 1 inhabits the northern slope, which has the highest primary productivity, and the potentially endemicMartinottiellasp. 3 inhabits Bowers Ridge, which has the lowest oxygen concentrations but relatively low annual productivity.Martinottiellasp. 3, with open pores on its test surface, has previously been reported in Pliocene to Recent material from Bowers Ridge. Despite relatively small sample sizes, ecological constraints may imply that the Bering Sea experienced high productivity and reduced oxygen at times since at least the Pliocene. We note the partially endemic nature of the agglutinated foraminiferal assemblages, which may at least in part be due to basin restriction, the geologically long time period of reduced oxygen, and high organic carbon flux. Our results indicate the importance of gathering further surface sample data from the Aleutian Basin.
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