Illing Björn, Moyano Marta, Hufnagl Marc, Peck Myron A
Institute of Hydrobiology and Fisheries Science, University of Hamburg, Olbersweg 24, Hamburg, D-22767, Germany.
Institute of Hydrobiology and Fisheries Science, University of Hamburg, Olbersweg 24, Hamburg, D-22767, Germany.
Mar Environ Res. 2016 Feb;113:164-73. doi: 10.1016/j.marenvres.2015.12.007. Epub 2015 Dec 15.
Projected, climate-driven changes in rainfall patterns are expected to alter the salinity (S) of estuaries and larger brackish water bodies, such as the Baltic Sea. Some marine fish larvae are potentially more sensitive to low salinity than older stages, hence we compared the low salinity tolerance of Atlantic herring (Clupea harengus) larvae at the individual and population levels including four populations in the North and Baltic Seas. Acute low salinity tolerance was similar (S = 1.9-2.7) across populations and increased with increasing body size. Based on this physiological threshold and a regionally down-scaled climate model, spawning habitats in the northern and eastern Baltic Sea are projected to be largely unsuitable for herring by 2100. Although adaptive mechanisms may attenuate the effect in some species, the limited physiological tolerance of fish larvae will remain an important bottleneck for the persistence of marine fish populations in brackish waters undergoing climate-driven freshening.
预计由气候驱动的降雨模式变化将改变河口以及波罗的海等更大的咸水水体的盐度（S）。一些海洋鱼类幼体可能比成体对低盐度更敏感，因此我们在个体和种群水平上比较了大西洋鲱（Clupea harengus）幼体的低盐度耐受性，其中包括北海和波罗的海的四个种群。各群体的急性低盐度耐受性相似（盐度=1.9 - 2.7），并且随着体型增大而增强。基于这一生理阈值和区域降尺度气候模型，预计到2100年，波罗的海北部和东部的产卵栖息地将基本不适合鲱鱼生存。尽管适应机制可能会减弱对某些物种的影响，但鱼类幼体有限的生理耐受性仍将是受气候驱动而变淡的咸水海域中海洋鱼类种群持续生存的一个重要瓶颈。
