Demographic analysis of scalloped hammerhead, Sphyrna lewini
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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=7·571 a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。
Abstract: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.
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Keywords:
- demographic analysis /
- Sphyrna lewini /
- scalloped hammerhead
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表 1 未开发状态下各种自然死亡对种群统计参数的影响
Table 1 Demographic parameters influenced by different natural mortality under unexploited
编号
no.tα/a tλ/a b/a-1 M0/a-1 M1~M15/a-1 r0/a-1 R0 G/a tx2/a I/% 1 5 15 6.4 0.279 0.279 0.265 6.212 7.571 2.616 30.3 2 5 15 6.4 0.349 0.279 0.254 5.792 7.571 2.729 28.9 3 5 15 6.4 0.419 0.279 0.243 5.401 7.571 2.852 27.5 4 5 15 6.4 0.488 0.279 0.233 5.041 7.571 2.975 26.2 5 5 15 6.4 0.558 0.279 0.221 4.700 7.571 3.136 24.7 6 5 15 6.4 0.349 0.349 0.195 3.712 7.152 3.555 21.5 7 5 15 6.4 0.436 0.349 0.182 3.403 7.152 3.809 20.0 8 5 15 6.4 0.524 0.349 0.168 3.116 7.152 4.126 18.3 9 5 15 6.4 0.611 0.349 0.154 2.857 7.152 4.501 16.6 10 5 15 6.4 0.698 0.349 0.141 2.619 7.152 4.916 15.1 
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