A possible adaptation of herring feeding migrations to a change in timing of the Calanus finmarchicus season in the eastern North Sea
A possible adaptation of herring feeding migrations to a change in timing of the Calanus finmarchicus season in the eastern North Sea
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鲱鱼摄食迁徙可能适应北海东部的Finmarchicus季的时间变化
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
A. Corten
中科院分区：
文献类型：
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作者：
A. Corten
在1983年北海鲱鱼渔业重新开放后的头几年里，初夏的渔获量中有相当高的比例是在北海东部捕捞的。1986年以后，北海东部渔获量所占比例逐渐下降。据推测，1980年代初北海东部的高渔获量是由于鲱鱼从北海东部向西部迁移的延迟。鲱鱼推迟离开北海东部可能是由于该地区有利的食物条件造成的。浮游生物连续记录仪（Continuous Plankton Recorder）对芬兰哲水蚤（Calanus finmarchicus）的记录表明，在1976-1984年期间，该桡足类在北海东部的季节性循环被推迟，导致该地区鲱鱼的食物供应延长。这可能是因为觅食季节的延长导致鲱鱼推迟了离开北海东部的时间。1985年后哲水蚤季节缩短，鲱鱼提前离开北海东部。在摄食季节的缩短和鲱鱼从北海东部提前离开之间，有一两年的延迟。这表明鲱鱼的迁徙中存在着某种保守性。看来，离开北海东部的时间不仅取决于当年的粮食状况，还取决于早些年粮食生产的平均时间。
During the first years after the re-opening of the North Sea herring fishery in 1983, a relatively high proportion of the catches in early summer was taken in the eastern North Sea. After 1986, the proportion of the catch in the eastern North Sea gradually declined. It is assumed that the high catches in the eastern North Sea in the early 1980s were due to a delayed migration of the herring from the eastern to the western part of the North Sea. This delayed departure of the herring from the eastern North Sea could have been caused by favourable food conditions in this area. Data on Calanus finmarchicus from the Continuous Plankton Recorder show that the seasonal cycle of this copepod in the eastern North Sea was delayed during the period 1976–1984, which resulted in an prolonged food supply for the herring in this area. It is likely that this extension of the feeding season induced the herring to delay their departures from the eastern North Sea. When the Calanus season shortened after 1985, the herring advanced their departure from the eastern North Sea. There was a delay of one or two years between the shortening of the feeding season and the earlier departure of the herring from the eastern North Sea. This suggests the existence of a certain conservatism in the migrations of the herring. It seems that the time of departure from the eastern North Sea is based not only on the food situation in the current year, but also on the average timing of food production in earlier years.