Identifying Life-History Traits That Promote Occurrence for Four Minnow (Leuciscidae) Species in Intermittent Gulf Coastal Plain Streams
Identifying Life-History Traits That Promote Occurrence for Four Minnow (Leuciscidae) Species in Intermittent Gulf Coastal Plain Streams
复制标题
确定促进间歇性墨西哥湾沿岸平原溪流中四种米诺鱼（雅罗鱼科）物种出现的生活史特征
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
S. Golladay
中科院分区：
文献类型：
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作者：
Jessica L. Davis;M. Freeman;S. Golladay
摘要溪流鱼类的生活史特征部分反映了对环境干扰的适应，而环境干扰又通过环境过滤器影响溪流鱼类的组合组成。在这项研究中，我们专注于生活史特征的4个形态相似leuciscid物种在沿海平原流西南GA的历史上常年间歇性流动的转变。我们评估了以下特征假设影响物种的持久性在间歇流：在生殖时间，性别比，身体大小成熟，生殖投资和饮食的差异。首先，我们整理了已发表的物种发生数据的鱼类群落的样本，在研究区域的常年和间歇性流，并确定了4个焦点类群不同，他们的协会与不稳定性。然后，我们在一年内（2016年5月至2017年4月）定期对14条溪流中的焦点类群进行采样。我们发现，Pteronotropis harvests（红眼鲢鱼），一个物种与间歇性流，生殖时间没有重叠与典型的季节性流干燥。红眼鲢鱼也有显着最小的最小长度在成熟和最大的生殖投资。与常年溪流（Pteronotropis grandipinnis [Apalachee Shiner]和Notropis texanus [Weed Shiner]）相关的鱼类，或与任何一种溪流类型（Notropis petersoni [Coastal Shiner]）无关的鱼类，其生殖时间至少有一部分与溪流可能干燥的时间重叠，并且具有相似且显着低于红眼鱼的生殖投资。红眼鲢鱼显示没有改变饮食时，溪流停止流动，而Apalachee夏纳显示陆地猎物减少。我们的研究结果表明，在成熟的大小，生殖时间，生殖投资可能会促进持久性的红眼鲢鱼流的更频繁和激烈的时期的预测。
Abstract Life-history traits of stream fishes partly reflect adaptations to disturbance regimes, which in turn shape assemblage composition via environmental filters. In this study, we focused on life-history traits of 4 morphologically similar leuciscid species in coastal plain streams of southwestern GA that are shifting from historically perennial to intermittent flow. We evaluated the following traits hypothesized to influence species persistence in intermittent streams: differences in reproductive timing, sex ratio, body size at maturity, reproductive investment, and diet. First, we ordinated published species occurrence data for samples of fish communities in perennial and intermittent streams in the study region, and identified 4 focal taxa as differing in their associations with intermittency. We then periodically sampled individuals of the focal taxa in 14 streams over a year (May 2016–April 2017). We found that for Pteronotropis harperi (Redeye Chub), a species strongly associated with intermittent streams, reproductive timing did not overlap with typical seasonal stream drying. Redeye Chub also had the significantly smallest minimum length at maturation and the greatest reproductive investment. Fishes associated with perennial streams (Pteronotropis grandipinnis [Apalachee Shiner] and Notropis texanus [Weed Shiner]), or not associated with either stream type (Notropis petersoni [Coastal Shiner]), had at least a portion of their reproductive timing overlapping with times when streams were likely to dry, and had similar and significantly lower reproductive investment than Redeye Chub. Redeye Chub displayed no shift in diet when streams ceased flowing, while Apalachee Shiner showed decreases in terrestrial prey. Our results suggest that size at maturity, reproductive timing, and reproductive investment may promote persistence by the Redeye Chub given projections of more frequent and intense periods of stream intermittency.