北极峡湾中受季节和空间环境梯度影响的底栖有孔虫群落生态模式

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Corentin Guilhermic, Maria Pia Nardelli, Aurélia Mouret, Antonio Pusceddu, Agnès Baltzer, Hélène Howa
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引用次数: 0

摘要

北极峡湾是冰川覆盖的陆地与海洋之间的过渡区域,具有强烈的环境梯度。冰川的季节性融化会产生强烈的浊度和初级生产拮抗梯度,从而影响底栖生物的栖息地。2021 年 5 月和 8 月,在康斯峡湾(斯瓦尔巴群岛,北冰洋)进行了两次取样活动,以研究距克罗尼布林潮汐冰川前沿 10 公里的纵向横断面上底栖有孔虫空间分布和生态系统功能的季节性变化。与此同时,还对有机质数量和生化组成、沉积物粒度以及水团物理参数进行了调查,以了解底栖生态系统反应的可能驱动因素。在之前的研究中,根据距冰川前沿最近 10 公里范围内的有孔虫物种含量,统计确定了三个有孔虫生物区系(冰川近端、中端和远端),这三个区系在两个季节都呈现出相似的组合。我们的研究结果表明,有孔虫在局部尺度上的分布主要受夏季潮水冰川融水和沉积物排放所引起的物理和地球化学梯度的驱动。由于气候变化,预计融化季节将持续更长的时间,全球温度的升高很可能会加速融化过程。我们的研究结果有力地支持了将有孔虫作为生物指标来监测正在发生的气候变化对北极峡湾底栖生态系统的影响,并作为近代重建冰川前沿位置的代用指标。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ecological patterns of benthic foraminiferal communities driven by seasonal and spatial environmental gradients in an Arctic fjord
Arctic fjords, being transitional areas between glacier‐covered land and the ocean, are characterized by strong environmental gradients. The seasonal melting of glaciers generates strong turbidity and primary production antagonist gradients, which can affect benthic habitats. Two sampling campaigns were carried out in Kongsfjorden (Svalbard, Arctic Ocean) in May and August 2021 to investigate seasonal changes in benthic foraminifera spatial distribution and ecosystem functioning along a longitudinal transect of 10 km from the Kronebreen tidewater glacier front. Concurrently, organic matter quantity and biochemical composition, sediment grain size, and physical parameters of the water masses were investigated as possible driving factors of benthic ecosystem responses. In a previous study, three statistically determined foraminiferal biozonations (glacier proximal, medial, and distal) were observed on the basis of their species content within the closest 10 km from the glacier front, presenting similar assemblages in both seasons. Our results indicate that foraminiferal distribution at the local scale is mainly driven by physical and geochemical gradients induced by melting waters and sediment discharges from the tidewater glacier occurring during summer. Due to the climate change, the melting season is expected to last longer and increasing global temperature will much probably accelerate the melting processes. Our findings strongly support the use of foraminifera as bioindicators to monitor the effects of ongoing climate change on the benthic ecosystems of Arctic fjords and, accessorily, as proxies for reconstructing glacier front positions in the recent past.
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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