Growth and maturation of Korean chum salmon under changing environmental conditions

Urbach, D., Kang, M., Kang, S., Seong, K.B., Kim, S., Dieckmann, U. ORCID: https://orcid.org/0000-0001-7089-0393, & Heino, M. ORCID: https://orcid.org/0000-0003-2928-3940 (2012). Growth and maturation of Korean chum salmon under changing environmental conditions. Fisheries Research 104-112. 10.1016/j.fishres.2012.08.008.

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Abstract

Salmon populations in the North Pacific have been subject to major changes in environmental and fishing pressure since the early 1980s, including a climate regime shift in 1988-1989, the closure of the high-seas fisheries in 1993, and a subsequent climatic event in 1998. In the present work, we evaluate whether any of these three events has triggered changes in the life-history traits of chum salmon (Oncorhynchus keta) from the Namdae River, on the eastern coast of South Korea, using data collected on females and males from 1984 to 2008. We find that the 1988-1989 regime shift had the most pervasive effects on female and male maturation schedule and growth. We also demonstrate sex-specific responses: whereas growth showed similar patterns of variation in both sexes, age and length at maturation behaved differently in males and females. Our findings contribute to growing evidence that abrupt transitions in climatic conditions can trigger detectable changes in life-history traits. They also strengthen the observation that biological records of salmon populations of the North Pacific carry a stronger signal for the effects of the 1988-1989 regime shift than for the effects of the subsequent environmental changes.

Item Type:	Article
Uncontrolled Keywords:	Fishing moratorium; Growth; Korean chum salmon; Maturation; Namdae River; Regime shift
Research Programs:	Evolution and Ecology (EEP)
Bibliographic Reference:	Fisheries Research; 134-136:104-112 (December 2012)
Depositing User:	IIASA Import
Date Deposited:	15 Jan 2016 08:46
Last Modified:	27 Aug 2021 17:22
URI:	https://pure.iiasa.ac.at/9876

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