全球智库信息集成服务系统(G2TT): Temporal trends in probabilistic maturation reaction norms and growth of Atlantic cod (Gadus morhua) on the Icelandic shelf.

G2TT

来源类型	Article
规范类型	其他
DOI	10.1139/F09-132
	Temporal trends in probabilistic maturation reaction norms and growth of Atlantic cod (Gadus morhua) on the Icelandic shelf.
	Pardoe H; Vainikka A; Thordarson G; Marteinsdottir G; Heino M
发表日期	2009
出处	Canadian Journal of Fisheries and Aquatic Sciences 66 (10): 1719-1733
出版年	2009
语种	英语
摘要	Decreasing temporal trends in probabilistic maturation reaction norm (PMRN) midpoints, symptomatic of earlier maturation despite environmentally induced variation in growth, have been observed in many exploited fish stocks. Here, we studied the growth and maturation trends of female and male Icelandic cod (Gadus morhua) by estimating PMRN midpoints for cohorts 1964-1999 and found evidence that a shift towards maturation at smaller sizes and younger ages has occurred independently of changes in growth, condition, and temperature. Weighting the data with regional survey abundance estimates to account for spatial heterogeneity in maturity status and sampling intensity did not qualitatively affect the temporal trends. Length-at-age also decreased through the study period, which, through simulations, could be attributed to the energetic costs of earlier maturity at maturing age groups but not at younger ages. These findings support the hypothesis that such changes in maturation schedules are not caused by environmental factors alone but could also reflect a genetic change, potentially in response to intensive fishing.
主题	Evolution and Ecology (EEP)
URL	http://pure.iiasa.ac.at/id/eprint/8801/
来源智库	International Institute for Applied Systems Analysis (Austria)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/128945
推荐引用方式 GB/T 7714	Pardoe H,Vainikka A,Thordarson G,et al. Temporal trends in probabilistic maturation reaction norms and growth of Atlantic cod (Gadus morhua) on the Icelandic shelf.. 2009.