Light climate and dissolved organic carbon concentration influence species-specific changes in fish zooplanktivory
Light climate and dissolved organic carbon concentration influence species-specific changes in fish zooplanktivory
复制标题
光照气候和溶解有机碳浓度影响鱼类浮游动物的物种特异性变化
DOI：
10.1080/20442041.2017.1329121
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发表时间：
2017
期刊：
影响因子：
3.1
通讯作者：
Jacob Aaron Zwart
中科院分区：
文献类型：
--
作者：
B. Weidel;Katherine Baglini;Stuart E. Jones;P. Kelly;C. Solomon;Jacob Aaron Zwart
摘要湖泊中的溶解有机碳（DOC）减少了光的穿透，限制了低营养湖泊的鱼类生产，据报道，通过减少初级和次级生产。或者，DOC和光的减少可能会影响鱼类改变他们的视觉喂养。以前的研究报告的混合效应DOC摄食率的食虫鱼类，但大多数研究人员测试的影响，单一浓度的DOC对清水，浑浊，或藻类治疗。我们使用了一个受控的实验室研究来量化DOC梯度（3-19 mg L−1）对平均光气候和3种常见的北温带鱼类的浮游动物摄食率的影响。光的可用性，这是成反比的DOC浓度，有一个积极的和线性的影响，浮游动物的消费由少年大口黑鲈（Micropterus salmoides）和蓝鳃金龟（Lepomis macrochirus），解释22%和28%的消费变化，分别。相比之下，浮游动物摄食率黑头呆鱼（黑头呆鱼）最好的预测的非线性，负面影响的光（R2 = 0.13）。在蓝鳃金龟饲养试验中，我们发现了一个总的趋势，积极选择较大的浮游动物（枝角类和Chaoboridae），然而，光气候并没有影响猎物类型的选择。大嘴鲈鱼选择较大体型的浮游动物，与弱证据表明，选择性大枝角类改变从消极到中性选择的基础上，在整个光梯度的选择性值。我们的研究结果表明，DOC对湖泊的光气候的影响可能会直接影响鱼类的食虫性，这种影响可能会因鱼类而异。
Abstract Dissolved organic carbon (DOC) in lakes reduces light penetration and limits fish production in low nutrient lakes, reportedly via reduced primary and secondary production. Alternatively, DOC and light reductions could influence fish by altering their visual feeding. Previous studies report mixed effects of DOC on feeding rates of zooplanktivorous fish, but most investigators tested effects of a single concentration of DOC against clear-water, turbid, or algal treatments. We used a controlled laboratory study to quantify the effects of a DOC gradient (3–19 mg L−1) on average light climate and the zooplankton feeding rate of 3 common, north temperate fishes. Light availability, which was inversely related to DOC concentration, had a positive and linear effect on zooplankton consumption by juvenile largemouth bass (Micropterus salmoides) and bluegill (Lepomis macrochirus), explaining 22% and 28% of the variation in consumption, respectively. By contrast, zooplankton feeding rates by fathead minnow (Pimephales promelas) were best predicted by a nonlinear, negative influence of light (R2 = 0.13). In bluegill feeding trials we found a general trend for positive selection of larger zooplankton (Cladocera and Chaoboridae); however, the light climate did not influence the selection of prey type. Largemouth bass selected for larger-bodied zooplankton, with weak evidence that selectivity for large Cladocera changed from negative to neutral selection based on electivity values across the light gradient. Our results suggest that the effect of DOC on the light climate of lakes may directly influence fish zooplanktivory and that this influence may vary among fish species.