Responses of macroinvertebrate communities to long-term flow variability in a Sonoran Desert stream
Responses of macroinvertebrate communities to long-term flow variability in a Sonoran Desert stream
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DOI：
10.1111/j.1365-2486.2010.02200.x
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发表时间：
2010-10-01
影响因子：
11.6
通讯作者：
Sabo, John L.
中科院分区：
文献类型：
--
作者：
Sponseller, Ryan A.;Grimm, Nancy B.;Sabo, John L.
目前的全球模型预测，美国西南部的气候将更加炎热和干燥，干旱频率和严重程度预计将增加，同时山洪暴发状况也将发生变化。这种变化可能会产生重要的生态后果，特别是对已经经常受到水文干扰的河流和河岸生态系统。本研究评估了水生大型无脊椎动物在空间上间歇性的沙漠流（西卡莫尔溪，亚利桑那州）水文年际变化的潜在响应。我们汇编了春季洪水后大型无脊椎动物群落恢复的数据，在16年的时间内（1983-1999年）捕获了11次演替序列。这一时期包括从常年到间歇性流在这个系统的过渡，并包括在1989年至1990年创纪录的干旱。结果表明，虽然洪水引发序列的大小有很小的解释力，在洪水后的演替过程中大型无脊椎动物群落结构的变化与前期洪水和干旱密切相关。年与年的差异，底栖生物群落综合分类特定的反应，前期的干扰，包括差异阻力通道干燥，使用hyporheic避难所，和变量恢复率一旦流恢复。干旱对群落结构的长期影响仅在洪水后演替的后期阶段才明显，说明了该系统中洪水和干旱恢复过程之间的相互作用。我们的观测结果突出表明，该地区预测的气候变化可能对沙漠溪流中的底栖生物群落产生显著和持久的影响。
Current global models predict a hotter and drier climate in the southwestern United States with anticipated increases in drought frequency and severity coupled with changes in flash flood regimes. Such changes would likely have important ecological consequences, particularly for stream and riparian ecosystems already subject to frequent hydrologic disturbance. This study assessed the potential response of aquatic macroinvertebrates to interannual variation in hydrology in a spatially intermittent desert stream (Sycamore Creek, AZ). We compiled data on the recovery of macroinvertebrate communities following spring floods, with successional sequences captured 11 times over a 16-year period (1983-1999). This period encompassed a transition from perennial to intermittent flow in this system, and included a record drought in 1989-1990. Results show that while the size of floods initiating sequences had little explanatory power, changes in macroinvertebrate community structure during postflood succession were closely associated with antecedent flooding and drought. Year-to-year differences in benthic communities integrated taxon-specific responses to antecedent disturbance, including differential resistance to channel drying, use of hyporheic refugia, and variable rates of recovery once stream flow resumed. The long-term consequences of drying on community structure were only evident during later stages of postflood succession, illustrating an interaction between flood and drought recovery processes in this system. Our observations highlight the potential for predicted climate changes in this region to have marked and long-lasting consequences for benthic communities in desert streams.