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首页> 外文会议>Symposium Managing Centrarchid Fisheries in Rivers and Streams >Changes in Body Condition and Diet of Lotic Smallmouth Bass across Two Flow Regimes during Summer Months at the Southern Extent of Their Native Range
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Changes in Body Condition and Diet of Lotic Smallmouth Bass across Two Flow Regimes during Summer Months at the Southern Extent of Their Native Range

机译：在夏季地区的夏季地区的两个流动制度跨越夏季地区的身体状况和饮食的变化

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摘要

The Ozark Plateau is located at the southern extent of native Smallmouth Bass Micropterus dolomieu range and water temperature and drought conditions during summer months may potentially affect growth of Smallmouth Bass in this region. Groundwater streams in the region do not warm to the same extent as runoff streams during summer months and could provide a thermal refuge habitat for Smallmouth Bass from high summer temperatures and drought conditions. Our study objective was to examine differences in body condition and diet of Smallmouth Bass through summer months between groundwater and runoff streams. We sampled Smallmouth Bass from eight streams across two flow regimes monthly from June-September from 2014 to 2016 in the Ozark Plateau of Arkansas and Missouri. Relative weights were calculated and diet contents were examined for each fish. Linear mixed model analyses indicated that relative weights declined in both stream types in 2014 and 2015, but not in 2016. Surprisingly, there was no significant difference in change in relative weights between runoff and groundwater streams in any year. No diet shifts over the course of the summer were noted in any year, and no differences were seen betweenstream types. Our results suggest that further work should investigate the refuge qualities of groundwater streams for Smallmouth Bass in this region as Smallmouth Bass from both stream types may currently respond similarly to summer conditions.
机译：Ozark Plateau位于南部的天然小型鲈鱼Micropterus Dolomieu系列，水温和夏季的干旱条件可能会影响该地区的小型鲈鱼的增长。该地区的地下水流在夏季，该地区的地下水在与径流流相同的程度上，可以为来自高夏季气温和干旱条件的小型鲈鱼提供热避难栖息地。我们的研究目标是通过地下水和径流流之间的夏季来检查小型鲈鱼身体状况和饮食的差异。我们在2014年6月至2016年在阿肯色州和密苏里州的欧扎克高原起，每月从两次流动制造商中排除八个溪流的Smallmouth Bass。计算相对重量，检查每条鱼的饮食内容物。线性混合模型分析表明，2014年和2015年的流类型中的相对重量下降，但在2016年，令人惊讶的是，任何一年的径流和地下水流之间的相对重量变化没有显着差异。在任何一年都注意到夏季的饮食转移，并且在体类型之间没有看到差异。我们的研究结果表明，进一步的工作应调查在这一地区的小型鲈鱼地下水流的地下水流避难所，因为来自两个流类型的小鲈鱼当前可能与夏季条件相似。

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