Quantifying environmental heterogenety: habitat size necessary for successful development of cod Gadus morhua eggs in the Baltic Sea.

MacKenzie, B.R., Hinrichsen, Hans-Harald, Plikshs, M., Wieland, K. and Zezera, A.S. (2000) Quantifying environmental heterogenety: habitat size necessary for successful development of cod Gadus morhua eggs in the Baltic Sea. Open Access Marine Ecology Progress Series, 193 . pp. 143-156. DOI 10.3354/meps193143.

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Abstract

Spatial and temporal variability in environmental factors can exert major influences on survival and growth of living organisms. However, in many key areas of fisheries science (e.g. growth, survival and recruitment determination), environmental heterogeneity is usually ignored because of insufficient environmental or fisheries data or lack of evidence that such heterogeneity impacts response variables. For the eastern Baltic Sea (ICES Subdivisions 25 to 32), we evaluated spatial and temporal differences in conditions affecting the survival of cod Gadus morhua L. eggs at survival on four distinct spawning sites within the assessment area. We intercalibrated ways of quantifying the volume of water ('reproductive volume') at each site where salinity, oxygen and temperature conditions permitted successful egg development. We have developed and compared a time series (1952 to 1996) of reproductive volumes among the areas to identify spatial differences. The results of 2 independent volume-estimation methods are comparable, indicating that highly significant differences exist among the sites, and that the westernmost spawning ground, Bornholm Basin, has on average the highest reproductive volume and the lowest variability among the 4 sites. These findings may be useful in evaluating how spatial and temporal variability in environmental conditions affect egg hatching success and possibly recruitment in the Baltic stock.

Document Type: Article
Keywords: Baltic Sea; Cod eggs; Environmental heterogeneity; Oxygen; Survival; Spatial distributions
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.3354/meps193143
ISSN: 0171-8630
Projects: Baltic Cod Recruitement Project
Date Deposited: 18 Feb 2008 17:24
Last Modified: 08 May 2018 13:30
URI: http://oceanrep.geomar.de/id/eprint/4649

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