Kristensen David M, Jørgensen Thomas R, Larsen Rasmus K, Forchhammer Mads C, Christoffersen Kirsten S
Dept. of Medical Biochemistry and Genetics A, Panum Institute, University of Copenhagen, Blegdamsvej 3, DK-2200 Copenhagen, Denmark.
BMC Ecol. 2006 Aug 27;6:10. doi: 10.1186/1472-6785-6-10.
Major changes in climate have been observed in the Arctic and climate models predict further amplification of the enhanced greenhouse effect at high-latitudes leading to increased warming. We propose that warming in the Arctic may affect the annual growth conditions of the cold adapted Arctic charr and that such effects can already be detected retrospectrally using otolith data.
Inter-annual growth of the circumpolar Arctic charr (Salvelinus alpinus, L.) was analysed in relation to climatic changes observed in the Arctic during the last two decades. Arctic charr were sampled from six locations at Qeqertarsuaq in West Greenland, where climate data have been recorded since 1990. Two fish populations met the criteria of homogeny and, consequently, only these were used in further analyses. The results demonstrate a complex coupling between annual growth rates and fluctuations in annual mean temperatures and precipitation. Significant changes in temporal patterns of growth were observed between cohorts of 1990 and 2004.
Differences in pattern of growth appear to be a consequence of climatic changes over the last two decades and we thereby conclude that climatic affects short term and inter-annual growth as well as influencing long term shifts in age-specific growth patterns in population of Arctic charr.
北极地区已观测到气候发生重大变化，气候模型预测高纬度地区增强的温室效应将进一步加剧，导致气温上升。我们认为，北极地区的变暖可能会影响适应寒冷环境的北极红点鲑的年度生长条件，并且利用耳石数据进行回顾性分析已经可以检测到这种影响。
分析了过去二十年间北极地区观测到的气候变化与环北极北极红点鲑（Salvelinus alpinus, L.）的年际生长情况之间的关系。北极红点鲑样本采自西格陵兰Qeqertarsuaq的六个地点，自1990年起该地区就有气候数据记录。两个鱼群符合同质性标准，因此仅将这两个鱼群用于进一步分析。结果表明，年增长率与年平均温度和降水量的波动之间存在复杂的耦合关系。在1990年和2004年的鱼群之间观察到生长时间模式的显著变化。
生长模式的差异似乎是过去二十年气候变化的结果，因此我们得出结论，气候影响北极红点鲑种群的短期和年际生长，以及特定年龄生长模式的长期变化。
