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| DOI | 10.1002/ece3.11034 |
| Assessing long-term diatom changes in sub-Arctic ponds receiving high fluxes of seabird nutrients | |
| 发表日期 | 2024 |
| ISSN | 2045-7758 |
| 起始页码 | 14 |
| 结束页码 | 2 |
| 卷号 | 14期号:2 |
| 英文摘要 | Algal bioindicators, such as diatoms, often show subdued responses to eutrophication in Arctic lakes because climate-related changes (e.g., ice cover) tend to be the overriding factors influencing assemblage composition. Here, we examined how sub-Arctic ponds historically receiving high nutrient inputs from nesting seabirds have responded to recent climate change. We present diatom data obtained from 12 sediment cores in seaduck-affected ponds located on islands through Hudson Strait, Canada. All study cores show consistently elevated values of sedimentary delta N-5, an established proxy for tracking marine-derived nutrients, indicating seabirds have been present on these islands for at least the duration of the sediment records (similar to 100 to 400 years). We document diverse epiphytic diatom assemblages to the base of all sediment cores, which is in marked contrast to seabird-free Arctic ponds-these oligotrophic sites typically record epilithic diatom flora prior to recent warming. Diatoms are likely responding indirectly to seabird nutrients via habitat as nutrients promote the growth of mosses supporting epiphytic diatom communities. This masks the typical diatom response to increased warming in the Arctic, which also results in habitat changes and the growth of mosses around the pond edges. Changes in sedimentary chlorophyll a were not consistently synchronous with large changes in delta N-15 values, suggesting that primary production in ponds is not responding linearly to changes in seabird-derived nitrogen. Across all ponds, we recorded shifts in diatom epiphytic assemblages (e.g., increases in % relative abundance of many Nitzschia species) that often align with increases in chlorophyll a. The changes in diatoms and chlorophyll a, although variable, are most likely driven by climate change as they are generally consistent with longer ice-free conditions and growing seasons. Together, our results show that to effectively use diatoms in animal population reconstructions across the sub-Arctic and Arctic, a strong understanding of eutrophication and climate change, based on supplementary proxies, is also required. |
| 英文关键词 | Arctic; diatoms; environmental change; freshwater ponds; paleolimnology; primary production; seaducks |
| 语种 | 英语 |
| WOS研究方向 | Environmental Sciences & Ecology ; Evolutionary Biology |
| WOS类目 | Ecology ; Evolutionary Biology |
| WOS记录号 | WOS:001163398500001 |
| 来源期刊 | ECOLOGY AND EVOLUTION
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/287515 |
| 作者单位 | University of Ottawa; Queens University - Canada |
| 推荐引用方式 GB/T 7714 | . Assessing long-term diatom changes in sub-Arctic ponds receiving high fluxes of seabird nutrients[J],2024,14(2). |
| APA | (2024).Assessing long-term diatom changes in sub-Arctic ponds receiving high fluxes of seabird nutrients.ECOLOGY AND EVOLUTION,14(2). |
| MLA | "Assessing long-term diatom changes in sub-Arctic ponds receiving high fluxes of seabird nutrients".ECOLOGY AND EVOLUTION 14.2(2024). |
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