Characteristics of juvenile survivors reveal spatio-temporal differences in early life stage survival of Baltic cod.

Huwer, B., Hinrichsen, Hans-Harald, Böttcher, U., Voss, Rüdiger and Köster, F (2014) Characteristics of juvenile survivors reveal spatio-temporal differences in early life stage survival of Baltic cod. Marine Ecology Progress Series, 511 . pp. 165-180. DOI 10.3354/meps10875.

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Abstract

The spatio-temporal origin of surviving juvenile Baltic cod Gadus morhua was investigated by coupling age information from otolith microstructure analysis and hydrodynamic modeling, which allowed backtracking of drift routes in time and space. The suitability of hydrodynamic modeling for drift simulations of early life stages of Baltic cod up to the pelagic juvenile stage was validated by comparing model simulations with the catch distribution from a survey targeting pelagic juveniles, and mortality rates and hatch date distributions of pelagic and demersal juveniles were estimated. Hatch dates and hatch locations of juvenile survivors showed distinct patterns which did not agree well with the abundance and spatial distribution of eggs, suggesting marked spatio-temporal differences in larval survival. The good agreement of the spatio-temporal origin of survivors from this field investigation with previous modeling studies on the survival chances of early-stage larvae and with general spatio-temporal patterns of larval prey availability suggests that differences in survival are related to food availability during the early larval stage. Results are discussed in relation to the recruitment process of Baltic cod, in particular with respect to the critical period and match-mismatch hypotheses, and to possible implications for the placement of a Marine Protected Area which was established to ensure undisturbed spawning of Baltic cod.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/266445
Additional Information: WOS:000342924200014
Keywords: Recruitment; Critical period hypothesis; Match-mismatch hypothesis; Mortality rate; Hydrodynamic modeling; Otolith; Hatch date; Marine Protected Area; Gadus morhua; ALKOR
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Evolutionary Ecology of Marine Fishes
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.3354/meps10875
ISSN: 0171-8630
Projects: BONUS BIO-C3, EUR-OCEANS, VECTORS, Future Ocean
Expeditions/Models/Experiments:
Date Deposited: 31 Oct 2014 10:55
Last Modified: 25 Jun 2018 10:57
URI: http://oceanrep.geomar.de/id/eprint/25671

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