CEF - Forest Research Centre, Instituto Superior de Agronomia, Universidade de Lisboa, Lisboa, Portugal; CEris - Civil Engineering for Research and Innovation for Sustainability, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal.
CEF - Forest Research Centre, Instituto Superior de Agronomia, Universidade de Lisboa, Lisboa, Portugal.
Sci Total Environ. 2017 Mar 1;581-582:486-494. doi: 10.1016/j.scitotenv.2016.12.156. Epub 2017 Jan 10.
River fragmentation due to artificial barriers directly impacts fish communities by limiting migratory movements. This work aims to understand how small barriers affect the movements of a potamodromous cyprinid species - the Iberian barbel (Luciobarbus bocagei (Steindachner, 1864)) - in a 5.6km upstream segment of a stream impacted only by the presence of physical barriers. Fish were marked with Visible Implant Elastomer tags (VIE), and barriers were seasonally characterized. A total of 683 fish were tagged, with 104 recaptures, during five sampling seasons (spring 2012 - early summer 2013). Eleven of the recaptured fish moved past a barrier, without any preference in terms of direction of movement. There were no differences in length, either between migrants and residents, or between upstream and downstream migrants. The results show that although barbel are able to negotiate small barriers, part of the population did not move between fragmented reaches - an indication that under such conditions, fish species populations may adjust their life-history strategy to augment residency as it was hypothesized from the results.
由于人工障碍物导致的河流破碎化直接影响鱼类群落，限制了洄游运动。本研究旨在了解小障碍物如何影响一种洄游性鲤科鱼类——伊比利亚巴贝鱼（Luciobarbus bocagei (Steindachner, 1864)）——在一条仅受物理障碍物影响的溪流上游 5.6 公里的河段中的运动。研究人员使用可见植入弹性体标签（VIE）对鱼类进行标记，并对障碍物进行季节性特征描述。在五个采样季节（2012 年春季至初夏 2013 年）中，共标记了 683 条鱼，并进行了 104 次回捕。11 条回捕的鱼游过了一个障碍物，没有表现出任何对运动方向的偏好。在洄游者和居民之间，或者在上游和下游洄游者之间，长度都没有差异。结果表明，尽管巴贝鱼能够通过小障碍物，但部分鱼类没有在破碎化的河段之间移动，这表明在这种情况下，鱼类种群可能会调整其生活史策略，增加其居留性，这与研究结果假设的情况一致。
