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¡¡¡¡ ¢Û[To get a better grip on the problem]£¬marine biologist Julia Baum of Dalhousie University in Halifax£¬Canada£¬ and colleagues trawled 35 years of marine surveys and fisheries data[to document declines in large sharks off the eastern seaboard of the U£®S£®]£®
¡¡¡¡¡¾½á¹¹¡¿±¾¾äµÄÖ÷ÓïÊÇ¡°marine biologist¡±£¬Î½Óﶯ´ÊÊÇ¡°trawled¡±¡£·½À¨ºÅËù±êʾµÄÁ½¸ö¶¯´Ê²»¶¨Ê½¶ÌÓï¡°To get¡­problem¡±ºÍ¡°to document¡­the U£®S£®¡±¶¼ÊÇÄ¿µÄ×´Óï¡£
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¡¡¡¡ ¢ÜSimultaneously£¬the abundance of l2 0f the l4 species[that these sharks prey on]--including the little skate£¬the chain catshark£¬and the cownose ray increased dramatically£®
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¡¡¡¡ ¢Ý¡°The result is profound¡±because the hiigh diversity of fishes in the northwest Atlantic has been thought to mini¡ª mize catastrophic changes in the food web3£¬says marine scientist Kenneth Frank of the Bedford Institute of Ocea nography in Dartmouth£¬Canada£®
¡¡¡¡¡¾½á¹¹¡¿·½À¨ºÅËù±êʾµÄ¡°because the high diversity¡­has been thought tO minimize¡­web¡±ÊÇÔ­Òò×´Óï´Ó¾ä£»ÆäÖеÄÖ÷ÓïÊÇ¡°the high diversity¡±£¬Î½Óﶯ´ÊÊÇ¡°has been thought¡±¡£
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¡¡¡¡ 1£®¸ù¾ÝµÚÒ»¶Î×îºóÒ»¾äÖеġ°These creatures¡­may be destroying sea grass habitat£¬which serves as a nursery for many species¡±¿ÉÖª£¬Ñ¡ÏîBӦΪ´ð°¸¡£
¡¡¡¡ 2£®¸ù¾ÝµÚ¶þ¶ÎµÚ¶þ¾ä¡°Demand for their fins and meat has resulted in increasing exploitation£¬¡­¡±¿ÉÖª£¬Ñ¡ÏîCӦΪ ´ð°¸¡£
¡¡¡¡ 3£®¸ù¾ÝµÚ¶þ¶Î×îºóÒ»¾ä¡°The effect of this decline on ocean ecosystems has also proven hard tO measure¡±£¬ÒÔ¼°µÚÈý¶ÎµÚÒ»¾ä¡°To get a better grip on the problem£¬marine biologist Julia Baum¡­trawled 35 years of marine sur¡ª veys and fisheries data¡­¡±¿ÉÖª£¬Ñ¡ÏîBӦΪ´ð°¸¡£
¡¡¡¡ 4£®¸ù¾ÝµÚÒ»¶ÎµÚ¶þ¾ä¡°Plunging populations of ll large shark species have caused a spike in the numbers of their prey£¬includin9¡­rays¡­¡±£¬ÒÔ¼°µÚËĶεÚÒ»¾ä¡°¡­the abundance of¡­species that these sharks prey on¡ª includin9¡­the cownose ray--increased dramatically¡±¿ÉÖª£¬Ñ¡ÏîCӦΪ´ð°¸¡£
¡¡¡¡ 5£®¸ù¾Ý±¾ÎÄ×îºóÒ»¾ä¡°People¡¯S appetites for oysters£¬clams£¬and scallops are likely having a more direct impact on these populations£¬he says¡±¿ÉÖª£¬Ñ¡ÏîDӦΪ´ð°¸¡£

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