新奇事件簿 全球變暖縮減魚類體積

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The size of fish in the oceans is shrinking. A new report from the University of British Columbia in Canada states fish may shrink by as much as a quarter in the coming decades because of global warming. The research team conducted extensive tests on the effect of rising ocean temperatures on the size and number of over 600 species of fish around the world. They concluded that most fish are likely to shrink in size by 14-24 per cent by the year 2050. The biggest changes will be seen in tropical regions. The scientists said there is less oxygen in warmer water so fish cannot grow at the rate they should. They added that many fish will migrate to cooler waters outside the tropics.

魚類體積正在逐漸變小。加拿大英屬哥倫比亞大學(xué)的最新報(bào)告稱，未來幾十年內(nèi)，魚類體積會(huì)因全球變暖而縮減四分之一。就水溫升高對(duì)魚類體積和數(shù)量的影響，研究小組對(duì)全球600多種魚類進(jìn)行了研究。他們推斷稱到2050年，多數(shù)魚類體積或?qū)⒖s減14-24%。熱帶魚的變化最為顯著?？茖W(xué)家認(rèn)為由于水溫升高，氧氣減少，導(dǎo)致魚類無法按照正常速度生長。他們補(bǔ)充道魚類將遠(yuǎn)離熱帶水域，游往冷水域。

Lead researcher Professor William Cheung said: "We were surprised to see such a large decrease in fish size. Marine fish are generally known to respond to climate change through changing distribution and seasonality. But the unexpectedly big effect that climate change could have on body size suggests that we may be missing a big piece of the puzzle of understanding climate change effects in the ocean." He added that human activities such as overfishing and pollution will worsen the problem. "Our work shows a very concerning future for the oceans and so it is very important to reduce greenhouse gas emissions and develop better fish management policies to adapt to these changes, he said.

研究主任威廉·張教授稱：“魚類體積的大幅度縮減讓我們非常吃驚。我們通常會(huì)認(rèn)為海魚會(huì)通過改變棲息地，或是改變水溫的方式來應(yīng)對(duì)氣候變化。但氣候變化卻對(duì)魚類體積產(chǎn)生了這么大的影響，這就意味著我們或無從得知?dú)夂蜃兓绊懞Ｑ蟮姆绞?。他還稱如過度捕撈，污染等人類活動(dòng)會(huì)讓事情進(jìn)一步惡化。他稱：“這項(xiàng)研究讓我們對(duì)未來海洋業(yè)憂心忡忡，減少溫室氣體排放，制定能夠適應(yīng)諸多變化的魚類管理政策，這至關(guān)重要。