Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13875 |
Tracing biogeochemical subsidies from glacier runoff into Alaska's coastal marine food webs | |
Arimitsu, Mayumi L.1; 39;Arcy N.2 | |
2018 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2018 |
卷号 | 24期号:1页码:387-398 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Canada; New Zealand |
英文摘要 | Nearly half of the freshwater discharge into the Gulf of Alaska originates from landscapes draining glacier runoff, but the influence of the influx of riverine organic matter on the trophodynamics of coastal marine food webs is not well understood. We quantified the ecological impact of riverine organic matter subsidies to glaciermarine habitats by developing a multi-trophic level Bayesian three-isotope mixing model. We utilized large gradients in stable (delta C-13, delta N-15, delta H-2) and radiogenic (Delta C-14) isotopes that trace riverine and marine organic matter sources as they are passed from lower to higher trophic levels in glacial-marine habitats. We also compared isotope ratios between glacial-marine and more oceanic habitats. Based on isotopic measurements of potential baseline sources, ambient water and tissues of marine consumers, estimates of the riverine organic matter source contribution to upper trophic-level species including fish and seabirds ranged from 12% to 44%. Variability in resource use among similar taxa corresponded to variation in species distribution and life histories. For example, riverine organic matter assimilation by the glacier-nesting seabirds Kittlitz's murrelet (Brachyramphus brevirostris) was greater than that of the forest-nesting marbled murrelet (B. marmoratus). The particulate and dissolved organic carbon in glacial runoff and near surface coastal waters was aged (12100-1500 years BP C-14-age) but dissolved inorganic carbon and biota in coastal waters were young (530 years BP C-14-age to modern). Thus terrestrial-derived subsidies in marine food webs were primarily composed of young organic matter sources released from glacier ecosystems and their surrounding watersheds. Stable isotope compositions also revealed a divergence in food web structure between glacial-marine and oceanic sites. This work demonstrates linkages between terrestrial and marine ecosystems, and facilitates a greater understanding of how climate-driven changes in freshwater runoff have the potential to alter food web dynamics within coastal marine ecosystems in Alaska. |
英文关键词 | delta C-13 delta N-15 Delta C-14 delta H-2 Bayesian isotope mixing model glacier runoff marine ecosystem marine food web |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000426506100060 |
WOS关键词 | PRINCE-WILLIAM-SOUND ; ORGANIC-MATTER ; STABLE-ISOTOPES ; TROPHIC RELATIONSHIPS ; ENVIRONMENTAL WATER ; HYDROGEN ; CARBON ; ZOOPLANKTON ; TERRESTRIAL ; NITROGEN |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/16941 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.US Geol Survey, Alaska Sci Ctr, Juneau, AK 99801 USA; 2.Environm & Climate Change Canada, Saskatoon, SK, Canada; 3.Quantifish, Hairini, Tauranga, New Zealand; 4.US Geol Survey, Alaska Sci Ctr, Anchorage, AK USA; 5.Univ Alaska Southeast, Juneau, AK USA |
推荐引用方式 GB/T 7714 | Arimitsu, Mayumi L.,39;Arcy N.. Tracing biogeochemical subsidies from glacier runoff into Alaska's coastal marine food webs[J]. GLOBAL CHANGE BIOLOGY,2018,24(1):387-398. |
APA | Arimitsu, Mayumi L.,&39;Arcy N..(2018).Tracing biogeochemical subsidies from glacier runoff into Alaska's coastal marine food webs.GLOBAL CHANGE BIOLOGY,24(1),387-398. |
MLA | Arimitsu, Mayumi L.,et al."Tracing biogeochemical subsidies from glacier runoff into Alaska's coastal marine food webs".GLOBAL CHANGE BIOLOGY 24.1(2018):387-398. |
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