Disturbance, nutrients, and antecedent flow conditions affect macroinvertebrate community structure and productivity in an Arctic river
Disturbance, nutrients, and antecedent flow conditions affect macroinvertebrate community structure and productivity in an Arctic river
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干扰、营养物和先前的水流条件影响北极河流大型无脊椎动物群落结构和生产力
DOI：
10.1002/lno.10942
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发表时间：
2018
影响因子：
4.5
通讯作者：
Huryn, Alexander D.
中科院分区：
文献类型：
--
作者：
Kendrick, Michael R.;Hershey, Anne E.;Huryn, Alexander D.
预计气候变化将改变作为全球生态系统结构和功能基础的扰动机制和生物地球化学循环。在北极，快速变暖已经通过降水量的变化和永久冻土的融化影响了这些过程。我们评估了如何预期的变化，干扰制度和营养物质的可用性可能会影响北极河流生态系统（Kuparuk河，阿拉斯加）通过分析生物膜叶绿素质量和大型无脊椎动物群落结构和生产力的时间模式。我们的研究包括上游河段（2001-2012年采样）和下游河段（2011-2012年采样），其中添加了磷（P）以模拟随着冻土融化而预期的营养供应增加。在开放水域季节，更大的水文扰动与次年春季和夏季藻类生物量和无脊椎动物次级生产量的减少（范围为2.2 -7 g DM m− 2 yr −1）相关。床干扰流也改变了大型无脊椎动物群落结构与不同的“高流量”和“基流”组合记录。叶绿素质量和大型底栖动物生产的恢复时间（101年）比群落结构（103年）短。实验P-除了增加藻类生物量和无脊椎动物的生产，但也导致了第三个大型无脊椎动物组合占主导地位的移动的食草动物，而不是滤食性动物。我们的研究结果表明，减少床干扰洪水的返回间隔< 4年将导致大型无脊椎动物群落结构的持续变化和食物网的根本改变。这些结果还表明，随着气候变暖，预计河流排放量和营养物供应量的增加和变化可能会影响北极河流群落。
Climate change is expected to alter disturbance regimes and biogeochemical cycles that underlie the structure and function of ecosystems worldwide. In the Arctic, rapid warming is already affecting these processes via changes in precipitation and thawing permafrost. We assessed how anticipated changes in disturbance regimes and nutrient availability may affect an arctic river ecosystem (Kuparuk River, Alaska) by analyzing temporal patterns of biofilm chlorophyll mass and macroinvertebrate community structure and productivity. Our study incorporated an upstream reach (sampled 2001–2012) and a downstream reach (sampled 2011–2012) to which phosphorus (P) was added to simulate increases in nutrient supply that are anticipated as permafrost thaws. Greater hydrologic disturbance during the open‐water season correlated with reduced algal biomass and invertebrate secondary production (range ∼ 2–7 g DM m−2yr−1) in the following spring and summer. Bed disturbing flows also altered macroinvertebrate community structure with distinct “high‐flow” and “base‐flow” assemblages documented. Recovery time was shorter for chlorophyll mass and macroinvertebrate production (∼ 1 yr) than community structure (∼ 3 yr). Experimental P‐addition increased algal biomass and invertebrate production, but also resulted in a third macroinvertebrate assemblage dominated by mobile grazers rather than filter‐feeders. Our results suggest that a decrease in the return interval for bed disturbing floods to < 4 yr will result in persistent changes in macroinvertebrate community structure and fundamental alterations to the food web. These results also demonstrate how arctic river communities may be affected by increases in the magnitude and variability of river discharge and nutrient supplies that are anticipated as the climate warms.
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DOI：
10.1890/12-0316.1
发表时间：
2013
期刊：
Ecological applications : a publication of the Ecological Society of America
影响因子：
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作者：
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作者：
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影响因子：
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作者：
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影响因子：
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作者：
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影响因子：
4.8
作者：
G. Minshall;Bahman Shafii;W. Price;Charlie Holderman;P. Anders;G. Lester;Pat Barrett
通讯作者：
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