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首页> 外文期刊>ICES Journal of Marine Science >Shifts in spawning phenology of cod linked to rising sea temperatures
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Shifts in spawning phenology of cod linked to rising sea temperatures

机译：鳕鱼产卵物候变化与海水温度上升有关

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摘要

Warming temperatures caused by climate change have the potential to impact spawning phenology of temperate marine fish as some species have temperature-dependent gonadal development. Inter-annual variation in the timing of Atlantic cod (Gadus morhua) spawning in the northern North Sea, central North Sea and Irish Sea was estimated by calculating an annual peak roe month (PRM) from records of roe landings spanning the last three decades. A trend towards earlier PRM was found in all three regions, with estimates of shifts in PRM ranging from 0.9 to 2.4 weeks per decade. Temperatures experienced by cod during early vitellogenesis correlated negatively with PRM, suggesting that rising sea temperatures have contributed to a shift in spawning phenology. A concurrent reduction in the mean size of spawning females excluded the possibility that earlier spawning was due to a shift in size structure towards larger individuals, as large cod spawn earlier than smaller-sized individuals in the North Sea. Further research into the effects of climate change on the phenology of different trophic levels within the North Sea ecosystem should be undertaken to determine whether climate change-induced shifts in spawning phenology will result in a temporal mismatch between cod larvae and their planktonic prey.
机译：由气候变化引起的升温可能会影响温带海鱼的产卵物候，因为某些物种的性腺发育与温度有关。通过计算过去三十年来鱼卵着陆的年度峰值鱼卵月份（PRM），可以估算出北北海，北海中部和爱尔兰海产的鳕鱼（加德斯·摩尔瓦）产卵时间的年际变化。在所有三个地区都发现了更早的PRM趋势，估计PRM的变化范围为每十年0.9到2.4周。鳕鱼卵黄体发生早期所经历的温度与PRM呈负相关，表明海水温度升高导致产卵物候发生变化。产卵雌虾平均大小的同时减少，排除了早期产卵的可能性是由于大小结构向较大个体的转移，因为大型鳕鱼的产卵早于北海较小个体的产卵。应进一步研究气候变化对北海生态系统中不同营养水平的物候的影响，以确定气候变化引起的产卵物候变化是否会导致鳕鱼幼虫与其浮游生物之间的时间失配。

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