The role of the hyporheic zone for a benthic fish in an intermittent river: a refuge, not a graveyard
The role of the hyporheic zone for a benthic fish in an intermittent river: a refuge, not a graveyard
复制标题
DOI：
10.1007/s00027-013-0289-4
复制
发表时间：
2013-03
期刊：
影响因子：
2.4
通讯作者：
R. Kawanishi;Mikio Inoue;R. Dohi;A. Fujii;Y. Miyake
中科院分区：
文献类型：
--
作者：
R. Kawanishi;Mikio Inoue;R. Dohi;A. Fujii;Y. Miyake
在流水系统中，潜流带被认为是水生生物在扰动期间的潜在避难所（潜流避难所假说）。然而，支持证据尚不清楚，特别是关于低流难民的生存及其对动乱后人口恢复的贡献。此外，很少有研究关注潜流避难所对于鱼类等水生脊椎动物的重要性。在这项研究中，我们提供的证据表明，在间歇性河流的表面干燥后，潜流带成为小型底栖鱼类（Cobitis shikokuensis）的避难所。我们通过直接潜流取样和标记再捕获调查来检查其在干旱期期间的存活率以及干旱期后的重新定殖情况。河床干涸后，在断续河段的33个地点进行了58次潜流取样，从抽取的潜流水中捕获了四国鲳鱼31尾。标记和重新捕获调查显示，重新湿润后的重新殖民者包括在潜流保护区的干旱期中幸存下来的 C.shikokuensis 个体。四国 C.shikokuensis 的状况因子在干旱期后显着下降，这表明大多数重新殖民者遭受了生理应激，可能是在潜流避难所内。这些结果清楚地支持了长期争论的潜流避难所假说，并提供了一个引人注目的例子，说明潜流区在流质生物种群维持中的关键作用。
In lotic systems, the hyporheic zone has been suggested as a potential refuge for aquatic organisms during disturbances (hyporheic refuge hypothesis). However, the supporting evidence is unclear, especially regarding the survival of hyporheic refugees and their contribution to the recovery of post-disturbance populations. Moreover, few studies have focused on the importance of the hyporheic refuge for aquatic vertebrates such as fish. In this study, we present evidence that the hyporheic zone acts as a refuge for a small benthic fish (Cobitis shikokuensis) following surface drying in an intermittent river. We examined its survival during and recolonization after dry periods by direct hyporheic sampling and mark-and-recapture surveys. When the streambed dried, hyporheic sampling was conducted 58 times across 33 locations in the intermittent reach and 31 individuals ofC.shikokuensiswere captured from extracted hyporheic water. Mark-and-recapture surveys revealed that recolonizers after re-wetting includedC.shikokuensisindividuals that had survived dry periods in the hyporheic refuge. The condition factor ofC.shikokuensissignificantly declined after dry periods, suggesting that most recolonizers suffered from physiological stress, probably within the hyporheic refuge. These results clearly support the long-debated, hyporheic refuge hypothesis, and provide a striking example of the critical role of the hyporheic zone in population maintenance of lotic organisms.