《自然》[Nature]13年2月21日出版pdf全文

nero1981

; W. x# g; v6 Q6 r8 ~
4 E# _' @: D( k' l! ^" i
( @* c, c: n* v
3 x" k; b3 {5 r! H7 V! a% S4 f) v" XThe fisheries industry around the world is in disarray. In some regions catches are stable and fishermen insist that all is well. Yet some researchers report fish numbers in dramatic decline and are calling for restrictions on fishing grounds. A central issue is the wisdom or otherwise of using estimates of the amount of fish hauled in by fishermen each year to assess the health of fisheries. In Comment this week we try to get to the facts. Daniel Pauly argues that catches, the only data available for many fisheries, are a crucial sign of the health of fish populations. Most fishermen today are catching fewer fish than their predecessors in the same waters. Catch data provide the information that researchers will need if they are to help reverse this trend. Ray Hilborn and Trevor Branch are not convinced. Many factors, not just abundance, determine the hauls of fishermen they say. Although important in terms of fisheries management, catch data alone cannot answer the question, how many fish are there in the sea? (Cover graphic: Denis Carrier).
- r! C% b  N. q0 K: |$ e' U1 W$ U# p! R2 @! r! A
[hide][/hide]

刘先生

内皮祖细胞

Kuo

这贴子你会收藏吗  

丸子

支持一下吧  

leeking

嘿...反了反了,,,,  

ladybird

顶你一下，好贴要顶！  

求索迷茫

好帖，有才  

石头111

天啊. 很好的资源

abc987

偶啥时才能熬出头啊.  

hmhy

彪悍的人生不需要解释。