Evolutionary consequences of age-specific harvesting: age at first reproduction

Advances in Difference Equations

Wichuta Sae-jie¹  Kornkanok Bunwong² 

[1] Centre of Excellence in Mathematics, CHE, Bangkok, Thailand;Department of Mathematics, Faculty of Science, Mahidol University, Bangkok, Thailand

关键词: age at first reproduction;    age-selective harvesting;    age-structured model;    harvesting;    invasion fitness;    life-history evolution;    39A30;    92B05;   

DOI  :  10.1186/s13662-017-1214-2

学科分类：数学（综合）

来源: SpringerOpen

【 摘 要 】

The aim of this paper is to investigate harvest-induced evolution in life-history strategies of a harvested single-species population. In particular, we analyze evolution of the trait age at first reproduction. The population is grouped into four age classes, namely, zero-year-olds (newborns), one-year-olds (juveniles), two-year-olds (small adults), and individuals aged three years or older (large adults). The population is assumed to consist of a ‘resident’ group and a ‘variant’ group that are identical except that the resident group usually first reproduces as a large adult and the variant group usually first reproduces as a small adult. The effect of various age-dependent harvesting strategies on the dynamics is studied both analytically and numerically. It is shown that age-dependent harvesting strategies can cause evolution from the resident group to the variant group. In addition, we show that a limit on the harvesting of the resident group can yield a sustainable fishery of the commercially preferred resident group.

【 授权许可】

CC BY