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首页> 外文期刊>Southeastern naturalist >Nest Association and Reproductive Microhabitat of the Threatened Blackside Dace, Chrosomus cumberlandensis
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Nest Association and Reproductive Microhabitat of the Threatened Blackside Dace, Chrosomus cumberlandensis

机译：受威胁的黑面ace（Chrosomus cumberlandensis）的巢联和生殖微生境

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Chrosomus cumberlandensis (Blackside Dace) is a federally protected cyprinid fish found in small tributaries of the upper Cumberland River system in southeastern Kentucky and northeastern Tennessee. Relatively little is known about the species' reproductive ecology and early life history. From a small number of field observations, the species is known to spawn as an associate with other cyprinid nest-building hosts, namely Campostoma anomalum (Central Stoneroller) and Semotilus atromaculatus (Creek Chub). In the present study, we first analyzed Blackside Dace co-occurrence patterns with other cyprinids to predict the relative importance of each species to Blackside Dace nest-association behavior. We next studied Blackside Dace spawning activities in seven 200-m reaches in five Kentucky streams during May-July 2006 to document nest associations and measure microhabitat conditions at spawning and non-spawning locations. Three of the seven study reaches were impacted by active logging operations. We observed 25 Blackside Dace spawning events, and all 25 were associated with Creek Chub nests, consistent with predictions from our species co-occurrence analysis. Spawning microhabitats were located in areas with significantly greater mean wetted-channel widths, slower column and bottom velocities, lower silt levels, lower substrate embeddedness, and larger subdominant substrate particles compared to non-spawning microhabitats. Study reaches with adjacent active logging had significantly greater mean silt levels, substrate embeddedness, water temperature, and conductivity values compared to reaches with no active logging, although 4 of the 25 spawning events occurred in reaches with active logging. Our results highlight the importance of cyprinid nest-building hosts (especially Creek Chub) to Blackside Dace reproductive ecology, and they also reinforce the need to maintain the integrity of Blackside Dace streams at the whole-community level.
机译：Chrosomus cumberlandensis（Blackside Dace）是一种受联邦政府保护的鲤科鱼类，在肯塔基州东南部和田纳西州东北部的坎伯兰河系小支流中发现。关于该物种的生殖生态学和早期生活史知之甚少。从少数实地观察中，已知该物种与其他鲤科巢筑巢宿主（即Camtopoma anomalum（中央滚石）和Semotilus atromaculatus（小溪））一起产卵。在本研究中，我们首先分析了Blackside Dace与其他鲤科鱼共生的模式，以预测每种物种对Blackside Dace巢关联行为的相对重要性。接下来，我们研究了2006年5月至7月在肯塔基州的五个溪流中七个200米河段的Blackside Dace产卵活动，以记录巢的关联并测量产卵和非产卵位置的微生境条件。七个测井研究中的三个受到主动采伐作业的影响。我们观察到25个Blackside Dace产卵事件，所有25个事件均与Creek Chub巢有关，这与我们物种共现分析的预测一致。与非产卵的微生境相比，产卵的微生境位于平均润湿通道宽度明显较大，柱和谷底速度较慢，淤泥含量较低，底物嵌入度较低以及较大的主要底物颗粒的区域。与25个产卵事件中有4个发生在主动采伐的河段相比，与相邻主动采伐的河段相比，未进行主动采伐的河段具有更高的平均泥沙水平，基质嵌入度，水温和电导率值。我们的研究结果凸显了塞浦路斯筑巢宿主（特别是Creek Chub）对Blackside Dace生殖生态的重要性，并且他们也强调了在整个社区一级维护Blackside Dace流的完整性的必要性。

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