Changes in fish condition and mercury vary by region, not Bythotrephes invasion: a result of climate change?
Changes in fish condition and mercury vary by region, not Bythotrephes invasion: a result of climate change?
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鱼类状况和汞含量的变化因地区而异，而不是水螅入侵：气候变化的结果？
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
A. Vaillancourt
中科院分区：
文献类型：
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作者：
M. Rennie;W. G. Sprules;A. Vaillancourt
本文比较了两种白鲑（湖鲱鱼Coregonus artedi，湖白鲑C. clupeaformis）在1967年至2006年之间在安大略的离散种群中。种群间的时间比较，以确定是否1）的建立Bythotrephes longimanus已影响coregonid种群，或2）如果身体状况或[汞]的变化与区域差异的气候变化程度在调查期间。来自西北部、东北部和安大略南部的气候数据显示，在研究期间，所有地区都有普遍变暖的趋势。然而，在西北部观察到更大的气候时间变化，在研究期间，生长度日> 5°C（GDD）增加，降水减少，而安大略南部或东北部的变化相对较小。相应地，西北部的安大略白鲑种群表现出显着更大的下降，相对于那些从东北部或南部安大略的身体状况。下降[汞]这两个物种也更大的西北人口相比，东北部或南部安大略，但只有显着湖鲱鱼。这些下降是独立的非本地Bythotrephes的入侵，[汞]的下降是相反的预测的基础上的假设，Bythotrephes入侵延长水生食物链。根据我们的研究结果和进一步的证据，从文献中，我们提出，变暖的区域气候能够促进鱼类的条件和[汞]的下降。由于鱼类状况影响繁殖成功和越冬生存，观察到的条件下降的幅度在这里报告可能有深远的影响，未来的水生生态系统的结构在气候变暖。
We compared changes in body condition (relative weight) and mercury concentrations ([Hg]) in two species of coregonid fish (lake herring Coregonus artedi, lake whitefish C. clupeaformis) among discrete populations in Ontario between 1967 and 2006. Temporal comparisons among populations were made to determine whether 1) the establishment of Bythotrephes longimanus had affected coregonid populations, or 2) if changes in body condition or [Hg] were related to regional differences in the degree of climate change during the time period investigated. Climate data from northwestern, northeastern and southern Ontario showed a general warming trend in all regions over the period of study. However, greater temporal changes in climate were observed in the northwest where growing degree days > 5°C (GDD) increased and precipitation declined over the study period compared with relatively little change in southern or northeastern Ontario. Correspondingly, northwestern Ontario coregonid populations demonstrated significantly greater declines in body condition relative to those from northeastern or southern Ontario. Declines in [Hg] of both species were also greater among northwestern populations compared with those from northeastern or southern Ontario but only significantly so for lake herring. These declines were independent of the invasion of non-native Bythotrephes, and declines in [Hg] were opposite predictions based on the hypothesis that Bythotrephes invasion lengthened aquatic food chains. Based on our findings and further evidence from the literature, we propose that warming regional climates are capable of contributing to declines in both condition and [Hg] of fishes. Because fish condition affects both reproductive success and overwinter survival, observed condition declines of the magnitude reported here could have profound implications for the structure of future aquatic ecosystems in a warming climate.
影响因子：
11.4
作者：
Pickhardt, Paul C.;Fisher, Nicholas S.
通讯作者：
Fisher, Nicholas S.