路氏双髻鲨的种群统计分析  

Demographic analysis of scalloped hammerhead, Sphyrna lewini

作　　者：陈丕茂[1] 李永振[1] 袁蔚文[1] 

机构地区：[1]中国水产科学研究院南海水产研究所,广东广州510300

出　　处：《南方水产》2006年第2期15-19,共5页South China Fisheries Science

基　　金：国家科技基础条件平台工作重点项目(2003DEA6N042);广东省海洋与渔业局重点科技项目"广东省渔业资源调查与跟踪分析"

摘　　要：根据路氏双髻鲨Sphyrnalewini的平均性成熟年龄tα=5a、寿命tλ=15a、平均出生率b=6·4·a-1和自然死亡系数M=0·279·a-1,估算在未开发状态下的内在瞬时增长率r0=0·265·a-1、世代生殖率R0=6·212、世代间期G=7·571a和种群倍增时间tx2=2·616a;探讨了M对r0等种群统计参数的影响;估算了不同开捕年龄tC时的临界捕捞死亡系数FC,拟合了FC和tC的关系式,证明FC随开捕年龄的增加而增加。当tC>5a,种群不会因捕捞而减少。Based on the mean age at first maturity tα =5 a, longevity tλ = 15 a, average natality b =6. 4·a^-1 , and natural mortality coefficient M = 0. 279·a^-1, demographic analysis was used for estimating a population intrinsic increase coefficient （ r0 ） of 0. 265 ·a^-1, a reproductive rate per generation （R0 ） of 6. 212, a generation time （G） of 7. 571 years and a population doubling time of 2. 616 years under unfished. Demographic parameters such as r0 affected by M were discussed. Fc at different first capture age were calculated, and relationship between Fc and tc was fitted. The results indicated that Fc increased with the first capture age. When tc 〉 5 a, the population will not decrease with capture.

关 键 词：种群统计分析 路氏双髻鲨 

分 类 号：S931.5[农业科学—渔业资源]