南极半岛西部亚极地峡湾底栖生物群落的高呼吸作用和生态系统对植物营养盐输入的反应

IF 3.8 1区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Pub Date : 2024-09-30 DOI:10.1002/lno.12688
Marta M. Cecchetto, Craig R. Smith, Clifton C. Nunnally, Andrew K. Sweetman
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引用次数: 0

摘要

冰川峡湾在南极半岛西部海岸边缘占主导地位。对北极类似生境的研究表明,由于气候变暖加剧了冰川融化,峡湾盆地内部和中部的底栖生物多样性和生态系统功能受到浊度和沉积物的干扰而减弱。相比之下,南极半岛西部沿岸的内峡湾和中峡湾盆地是生产力和生物多样性的热点地区,但底栖生态系统功能仍未得到评估。2015-2016 年,我们进行了沉积物呼吸和 13C 脉冲追逐实验,以评估从内安德沃德湾峡湾到格拉奇海峡,再到开阔大陆架的约 500-600 米深度五站横断面的底栖生态系统功能。与较偏远的站点相比,来自安德渥德湾内湾和中湾的孵化样本在海底呼吸、底栖生物量和对标记藻类生物量的吸收方面都达到了峰值;大陆架在这些变量以及溶解无机碳产量方面的水平最低。大型底栖生物群落的吸收是峡湾内部和中部大部分碳处理过程的主要原因(45%),而溶解无机碳则是峡湾口附近和大陆架上碳处理过程的主要来源(80%)。除生物多样性外,安德沃德海湾内部也是底栖生物碳循环和新陈代谢的热点地区。持续的气候变暖可能会通过增加融水输入和沉积扰动对这些内峡湾热点产生负面影响,从而导致内-中峡湾海底可溶性碎屑的输入和循环减少。
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High benthic community respiration and ecosystem response to phytodetrital input in a subpolar fjord on the West Antarctic Peninsula
Glaciomarine fjords dominate the coastal margin of the West Antarctic Peninsula. Studies in similar habitats in the Arctic have shown that benthic biodiversity and ecosystem functioning in inner and middle fjord basins are reduced by turbidity and sedimentation disturbance caused by climate warming–enhanced glacial melting. In contrast, the inner and middle fjord basins along the West Antarctic Peninsula are characterized as productivity and biodiversity hotspots, but benthic ecosystem functions remain unevaluated. In 2015–2016, we conducted sediment respiration and 13C pulse‐chase experiments to assess benthic ecosystem functions along a five‐station transect at ~ 500–600 m depths from the inner Andvord Bay fjord, through to Gerlache Strait, and onto the open continental shelf. Incubation samples from the inner and middle basins of Andvord Bay showed peaks in background seafloor respiration, benthic biomass, and uptake of labeled algal biomass compared to more outlying stations; the continental shelf exhibited the lowest levels of these variables, as well as dissolved inorganic carbon production. Macrofaunal community uptake was responsible for most of the C processing in the inner and middle parts of the fjord (> 45%) while dissolved inorganic carbon was the dominant repository of processed C near the fjord mouth and on the continental shelf (> 80%). The inner parts of Andvord Bay are hotspots of benthic C‐cycling and metabolism, in addition to biodiversity. Ongoing climate warming is likely to negatively impact these inner‐fjord hotspots by increasing meltwater input and sedimentation disturbance, yielding a reduction in the input and recycling of labile detritus at the seafloor in the inner‐middle fjord.
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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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