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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/36654

Title: Demographic analysis of the shortfin mako shark, Isurus oxyrinchus, in the Northwestern Pacific using a two-sex stage-based matrix model.
Authors: Tsai W. P.;C. L. Sun.;A. E. Punt;K. M. Liu.
Contributors: NTOU:Institute of Marine Affairs and Resource Managemen
Keywords: Monte Carlo simulation;population growth rate;sexual dimorphism;stock assessment
Date: 2014
Issue Date: 2015-05-19T06:43:48Z
Publisher: ICES Journal of Marine Science
Abstract: Most demographic models are single sex, and assume both sexes have the same vital rates. However, many species, including the shortfin mako shark, are sexually dimorphic in vital rates, which suggests the need for two-sex models. In this study, a two-sex stage-structured matrix model was constructed to estimate shortfin mako shark demography and population dynamics. Monte Carlo simulations were used to evaluate the impact of uncertainties on the estimate of population growth rate. The number of shortfin mako sharks is found to be dropping under current conditions, but will stabilize if size-limit management is implemented. The simulations indicated that population growth rate estimates are mainly influenced by the uncertainty related to survival rate and fecundity. The effects of uncertainty regarding the age at maturity and longevity were found to be relatively minor. Future research should focus on obtaining estimates of natural mortality and reproductive traits for this species to improve the accuracy of demographic estimates.
Relation: 71(7), pp.1604-1618
URI: http://ntour.ntou.edu.tw/handle/987654321/36654
Appears in Collections:[海洋事務與資源管理研究所] 期刊論文

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