Are culvert assessment scores an indicator of Brook Trout Salvelinus fontinalis population fragmentation
Are culvert assessment scores an indicator of Brook Trout Salvelinus fontinalis population fragmentation
复制标题
涵洞评估分数是否是布鲁克鳟鱼种群破碎化的指标
DOI：
10.1016/j.ecolind.2017.08.033
复制
发表时间：
2018
影响因子：
6.9
通讯作者：
J. Vokoun
中科院分区：
文献类型：
--
作者：
L. Nathan;A. Smith;A. Welsh;J. Vokoun
碎片化是对河流生态系统完整性的主要威胁，保持连通性是保护以促进自然系统功能的主要目标。在人类主导的具有广泛人为碎片化的系统中，资源管理者面临着确定恢复行动的优先顺序，以提供最具成本效益的保护战略。人行横道，特别是设计糟糕的涵洞，限制了鱼类通过，从而限制了种群的连通性和获得季节性重要资源的机会。涵洞评估协议，例如由北大西洋水生连通性合作组织(NAACC)开发的协议，是管理人员评估涵洞通过性和确定广泛空间范围内修复行动优先顺序的有用工具，但此类协议的合理性需要基于经验的现场调查。在这项研究中，我们收集了28条溪流源头的遗传样本，其中17条是通过涵洞交叉路口分离出来的，11条是与自然遗传结构相比较的。这项研究的目的是1)确定涵洞对小溪鲑鱼种群遗传的影响，2)评估NAACC涵洞评估协议预测遗传模式的能力，3)确定最能解释遗传变异的涵洞特征。我们发现，与没有涵洞的地点相比，有涵洞的地点的遗传分化显著增加，但遗传多样性指标没有差异。尽管NAACC分类没有预测遗传分化的程度，但涵洞的开放比率(横截面面积/长度)显著相关，这表明它可能需要在评估方案中获得更高的权重。我们的结果强调了将适当的优先战略与预期的管理目标相匹配的必要性，以便设计最有效的保护行动。
Fragmentation is a major threat to the integrity of stream ecosystems and maintaining connectivity is a primary goal for conservation to promote natural system functioning. In human dominated systems with extensive anthropogenic fragmentation, resource managers are faced with prioritizing restoration actions to provide the most cost-effective conservation strategies. Road crossings, particularly poorly designed culverts, limit fish passage and thus population connectivity and access to seasonally important resources. Culvert assessment protocols, such as the one developed by the North Atlantic Aquatic Connectivity Collaborative (NAACC), are useful tools for managers to evaluate culvert passability and prioritize restoration actions across broad spatial extents, however the justification of such protocols requires empirical field based investigations. In this study we collected Brook Trout genetic samples from 28 headwater streams, of which 17 were separated by a culverted road crossing and 11 were included as a comparison to natural genetic structuring. The objectives of this research were to 1) determine what effect culverts had on the genetics of Brook Trout populations, 2) evaluate the ability of the NAACC culvert assessment protocol to predict genetic patterns and 3) identify the culvert characteristics that best explained genetic variability. We found significant increases in genetic differentiation at sites with culverts compared to those without, but no differences in genetic diversity metrics. Although the NAACC classifications did not predict the extent of genetic differentiation, the openness ratio of culverts (cross sectional area/length) was significantly correlated, suggesting it may need to receive a higher weighting in assessment protocols. Our results highlight the necessity to match appropriate prioritization strategies with desired management objectives in order to design the most effective conservation actions.
DOI：
10.1111/j.1471-8286.2004.00845.x
发表时间：
2005-03-01
期刊：
MOLECULAR ECOLOGY NOTES
影响因子：
--
作者：
Kalinowski, ST
通讯作者：
Kalinowski, ST