Oxygen depletion in coastal seas and the effective spawning stock biomass of an exploited fish species

Hinrichsen, Hans-Harald, von Dewitz, Burkhard, Dierking, Jan, Haslob, Holger, Makarchouk, A., Petereit, Christoph and Voss, Rüdiger (2016) Oxygen depletion in coastal seas and the effective spawning stock biomass of an exploited fish species Royal Society Open Science, 3 (1). p. 150338. DOI 10.1098/rsos.150338.

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Environmental conditions may have previously underappreciated effects on the reproductive processes of commercially exploited fish populations, for example eastern Baltic cod, that are living at the physiological limits of their distribution. In the Baltic Sea, salinity affects neutral egg buoyancy, which is positively correlated with egg survival, as only water layers away from the oxygen consumption-dominated sea bottom contain sufficient oxygen. Egg buoyancy is positively correlated to female spawner age/size. From observations in the Baltic Sea, a field-based relationship between egg diameter and buoyancy (floating depth) could be established. Hence, based on the age structure of the spawning stock, we quantify the number of effective spawners, which are able to reproduce under ambient hydrographic conditions. For the time period 1993–2010, our results revealed large variations in the horizontal extent of spawning habitat (1000–20 000 km2) and oxygen-dependent egg survival (10–80%). The novel concept of an effective spawning stock biomass takes into account offspring that survive depending on the spawning stock age/size structure, if reproductive success is related to egg buoyancy and the extent of hypoxic areas. Effective spawning stock biomass reflected the role of environmental conditions for Baltic cod recruitment better than the spawning stock biomass alone, highlighting the importance of including environmental information in ecosystem-based management approaches.

Document Type: Article
Keywords: neutral egg buoyancy; Bornholm Basin; habitat suitability; oxygen-related cod egg survival; recruitment
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Evolutionary Ecology of Marine Fishes
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > The Future Ocean - Cluster of Excellence > FO-R03
Refereed: Yes
DOI etc.: 10.1098/rsos.150338
ISSN: 2054-5703
Related URLs:
Projects: BONUS BIO-C3, INSPIRE, Future Ocean
Date Deposited: 14 Jan 2016 09:30
Last Modified: 19 Dec 2017 12:49
URI: http://eprints.uni-kiel.de/id/eprint/30972

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