Effects of stream intermittency on minnow (Leuciscidae) and darter (Percidae) trophic dynamics in an agricultural watershed
Effects of stream intermittency on minnow (Leuciscidae) and darter (Percidae) trophic dynamics in an agricultural watershed
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河流间歇性对农业流域内的米诺鱼（Leuciscidae）和鲈鱼（Percidae）营养动态的影响
DOI：
10.1111/eff.12649
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发表时间：
2022
影响因子：
1.8
通讯作者：
Golladay, Stephen W.
中科院分区：
文献类型：
--
作者：
Fallon, Christine E.;Capps, Krista A.;Freeman, Mary C.;Smith, Chelsea R.;Golladay, Stephen W.
预计在取水量和气候变暖增加的地方，河流的不透明度会增加。在鱼类多样性高的地区，了解鱼类营养生态学对生态系统功能的影响至关重要。这项研究比较了鱼类饲料跨季节的常年和间歇流，以估计即时和累积的影响流干燥鱼类觅食模式。我们使用肠道内容物分析来比较小型的二次消费鱼类的饮食，包括在格鲁吉亚西南部弗林特河流域下游发现的两种小鱼和三种镖鲈，在夏季（溪流干涸前）和秋季（水流恢复后）季节。鱼类群落在常年流有更大的饮食丰富度相比，鱼类在间歇流的两个季节。达特饮食的特点是在常年流和底栖甲壳类动物（桡足类，枝角类和等足类）和捕食性水生昆虫在间歇性流中的喜流水生昆虫。小鱼饮食的典型淡水海绵，鸡蛋和有机碎屑在间歇性流和陆生昆虫和硅藻在常年流。鱼类在间歇性流消耗更多的底栖甲壳类动物在秋季（37%的比例体积增加）相比，在夏季流停止前的条件，这表明这些生物体发挥重要的，但相对未被认可的作用，在支持鱼类群落在东南流。我们的研究结果增强了我们的理解，如何流不透明度影响的农业流域日益受到水资源短缺的影响，二次消费鱼类的营养动态。
Stream intermittency is predicted to increase where water withdrawals and climate warming are increasing. In regions coupled with high fish diversity, understanding how intermittency influences fish trophic ecology is critical for informing ecosystem function. This study compared fish diets across seasons in perennial and intermittent streams to estimate the immediate and cumulative effects of stream drying on fish foraging patterns. We used gut content analysis to compare the diets of small‐bodied, secondary consumer fishes, including two minnow and three darter species found in the lower Flint River Basin of southwestern Georgia, during both the summer (before stream dry‐down) and fall (post flow resumption) seasons. Fish communities in perennial streams had greater diet richness compared to fishes in intermittent streams for both seasons. Darter diets were characterised by rheophilic aquatic insects in perennial streams and by benthic crustaceans (copepods, cladocerans and isopods) and predatory aquatic insects in intermittent streams. Minnow diets were typified by freshwater sponges, eggs and organic detritus in intermittent streams and by terrestrial insects and diatoms in perennial streams. Fishes in intermittent streams consumed significantly more benthic crustaceans in the fall (37% increase in proportional volume) compared to preflow cessation conditions in the summer, suggesting these organisms play an important, yet relatively unrecognised role in supporting fish communities in southeastern streams. Our findings enhance our understanding of how stream intermittency influences the trophic dynamics of secondary consumer fishes in an agricultural watershed increasingly affected by water scarcity.
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