Department of Biology, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway.
J Fish Biol. 2009 May;74(7):1383-93. doi: 10.1111/j.1095-8649.2009.02193.x.
The pre-winter lipid stores of young-of-the-year (YOY, age 0 year) Atlantic salmon Salmo salar were analysed along a north-south gradient from c. 71 to 58 degrees N, with winter conditions ranging from >200 days of ice cover to no ice. The rivers sampled in Northern Norway represent some of the most northerly S. salar rivers. There was an increase in lipid content with increasing latitude, and mean lipid content (size adjusted to common mass) for YOY in northern rivers were almost three times higher: 0.035 g compared to 0.013 g in southern rivers. The relationship was not sensitive to variation in sampling time or variation in YOY body size. The lipid stores, however, varied markedly between rivers and also between neighbouring rivers, indicating different strategies or opportunities for pre-winter lipid storage both at latitudinal and local scales.
我们分析了沿北纬 71 度至 58 度的一个南北梯度上，当年幼的大西洋鲑（Salmo salar，年龄为 0 龄）的越冬前脂肪储备，这些鲑鱼来自冬季冰期超过 200 天到无冰期的各种水域。在挪威北部采集样本的河流是最靠北的鲑鱼洄游河流之一。脂肪含量随着纬度的增加而增加，北方河流中当年幼鲑鱼的平均脂肪含量（按常见质量调整大小）几乎是南方河流的三倍：北方为 0.035 克，南方为 0.013 克。这种关系不受采样时间变化或当年幼鲑鱼体型变化的影响。然而，脂肪储备在河流之间以及相邻河流之间差异显著，这表明在纬度和局部尺度上越冬前脂肪储存存在不同的策略或机会。
