Nowhere to swim: interspecific responses of prairie stream fishes in isolated pools during severe drought
Nowhere to swim: interspecific responses of prairie stream fishes in isolated pools during severe drought
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无处可游：严重干旱期间孤立水池中草原溪流鱼类的种间反应
DOI：
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发表时间：
2020
期刊：
影响因子：
2.4
通讯作者：
L. Bruckerhoff
中科院分区：
文献类型：
--
作者：
Garrett W. Hopper;K. Gido;C. Pennock;S. Hedden;Bryan D. Frenette;N. Barts;C. Hedden;L. Bruckerhoff
极端干旱可以极大地改变溪流的非生物特征，物种对条件变化的反应也不同。我们修改了一个概念模型描述的水生无脊椎动物组合流干燥的响应，以方便预测的鱼类组合的变化，其中阈值的物理化学梯度导致间断性损失的鱼类多样性流连接减少。我们测试了这个模型的适用性，在一个破纪录的干旱，减少了一个常年达到的源头草原流到一系列的12个孤立的游泳池与可变水平的潜流连接，与池量。我们跟踪了七个多星期的游泳池中的鱼类组合结构，并测量了非生物条件。在实验室中测试了抗旱性状的种间差异（即，耐热和耐缺氧）对于经历干旱条件的常见物种来说。物种丰富度下降迅速与池量与潜流连接。在干旱前最常见的物种，红腹鱼（南方红腹？尽管是最不耐缺氧，Campostoma candelum（中央stoneroller）人口坚持在大多数池。其余的游泳池成为占主导地位的非本地极端嗜鱼，食蚊鱼（西部食蚊鱼）和丰度较低的抵抗本地物种下降。我们的研究表明，丰富的干燥池是由与池体积相关的因素驱动，组合组成从本地物种适应可变的水文条件，能够抵抗温度升高和缺氧的非本地物种的优势。突然的物种损失与减少流连接可以改变丰富的草原溪流鱼类群落的模式，对人口和社区动态的潜在滞后影响。
Extreme drying can dramatically shift abiotic characteristics of streams and species respond differently as conditions change. We modified a conceptual model describing responses of aquatic invertebrate assemblages to stream drying to facilitate predictions of fish assemblage shifts in which thresholds of physiochemical gradients lead to punctuated losses of fish diversity as stream connectivity diminishes. We tested the applicability of this model during a record-breaking drought that reduced a perennial reach of a headwater prairie stream to a series of 12 isolated pools with variable levels of hyporheic connectivity that was associated with pool volume. We tracked fish assemblage structure in pools over seven weeks and measured abiotic conditions. Inter-specific differences in drought resistance traits were tested in the lab (i.e., thermal and hypoxia tolerance) for common species experiencing drought conditions. Species richness declined rapidly with pool volume associated with hyporheic connectivity. Abundance of the most common species prior to drought, Chrosomus erythrogaster (southern redbelly dace) declined 95% and was extirpated from five pools during drought due to its low thermal tolerance. Despite being the least tolerant to hypoxia, Campostoma anomalum (central stoneroller) populations persisted in most pools. The remaining pools became dominated by a non-native extremophile fish, Gambusia affinis (western mosquitofish) and abundances of less resistant native species declined. Our study demonstrates that richness in drying pools is driven by factors associated with pool volume, and assemblage composition shifts from dominance by native species adapted to variable hydrological conditions to non-native species able to resist increasing temperatures and hypoxia. Sudden species loss associated with reduced stream connectivity can shift abundance patterns of prairie stream fish communities with potentially lagged effects on population and community dynamics.
严重干旱期间生物量损失和物种优势的变化改变了河流群落排泄化学计量
影响因子：
2.7
作者：
Hopper, Garrett W.;Gido, Keith B.;Pennock, Casey A.;Hedden, Skyler C.;Guinnip, James P.;Fisher, Molly A.;Tobler, Courtney M.;Hedden, Crosby K.;Bruckerhoff, Lindsey A.
通讯作者：
Bruckerhoff, Lindsey A.