Slow developers risk all for a meal

日期:2017-11-08 04:33:16 作者:司城尾 阅读:

UNDERSIZED salmon try to catch up with well-grown rivals by taking more risks when feeding. Neil Metcalfe and his team at the University of Glasgow attached electronic tags to salmon that were all the same age, but different sizes. They could then monitor when the fish emerged from hiding places to feed (Proceedings of the Royal Society, vol 265 p 1503). Larger salmon were nocturnal feeders, but smaller fish were more active during the day. Salmon can spot food more easily in daylight, but risk being caught by predators. Metcalfe suggests that larger fish, which are in better condition,