Egg mortality: predation and hydrography in the central Baltic

R. Voss, H.-H. Hinrichsen, D. Stepputtis, M. Bernreuther, Bastian Huwer, Viola Neumann, J.O. Schmidt

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Abstract

Cod and sprat are the dominant fish species in the Baltic pelagic ecosystem, both of great economic importance and ecologically strongly interlinked. Management of both species is challenged by highly variable recruitment success. Recent studies have identified predation and hydrographic conditions during the egg phase to be of critical importance. Two years of extensive field investigations in the Bornholm Basin, central Baltic Sea, were undertaken. In 2002, a typical stagnation situation characterized by low salinity and poor oxygen conditions was investigated, and in early 2003, a major inflow of North Sea water completely changed the hydrographic conditions by increasing salinity and oxygen content, thereby altering ecological conditions. The goal was to quantify egg mortality caused by predation and hydrography, and to compare these estimates with independent estimates based on cohort analysis. Results indicated high intra-annual variability in egg mortality. Cod and sprat egg mortality responded differently to the major Baltic inflow: mortality related to hydrographic conditions increased for sprat and decreased for cod. On the other hand, predation mortality during peak spawning decreased for sprat and increased for cod.
Original languageEnglish
JournalICES Journal of Marine Science
Volume68
Issue number7
Pages (from-to)1379-1390
ISSN1054-3139
DOIs
Publication statusPublished - 2011

Cite this

Voss, R., Hinrichsen, H-H., Stepputtis, D., Bernreuther, M., Huwer, B., Neumann, V., & Schmidt, J. O. (2011). Egg mortality: predation and hydrography in the central Baltic. ICES Journal of Marine Science, 68(7), 1379-1390. https://doi.org/10.1093/icesjms/fsr061
Voss, R. ; Hinrichsen, H.-H. ; Stepputtis, D. ; Bernreuther, M. ; Huwer, Bastian ; Neumann, Viola ; Schmidt, J.O. / Egg mortality: predation and hydrography in the central Baltic. In: ICES Journal of Marine Science. 2011 ; Vol. 68, No. 7. pp. 1379-1390.
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abstract = "Cod and sprat are the dominant fish species in the Baltic pelagic ecosystem, both of great economic importance and ecologically strongly interlinked. Management of both species is challenged by highly variable recruitment success. Recent studies have identified predation and hydrographic conditions during the egg phase to be of critical importance. Two years of extensive field investigations in the Bornholm Basin, central Baltic Sea, were undertaken. In 2002, a typical stagnation situation characterized by low salinity and poor oxygen conditions was investigated, and in early 2003, a major inflow of North Sea water completely changed the hydrographic conditions by increasing salinity and oxygen content, thereby altering ecological conditions. The goal was to quantify egg mortality caused by predation and hydrography, and to compare these estimates with independent estimates based on cohort analysis. Results indicated high intra-annual variability in egg mortality. Cod and sprat egg mortality responded differently to the major Baltic inflow: mortality related to hydrographic conditions increased for sprat and decreased for cod. On the other hand, predation mortality during peak spawning decreased for sprat and increased for cod.",
author = "R. Voss and H.-H. Hinrichsen and D. Stepputtis and M. Bernreuther and Bastian Huwer and Viola Neumann and J.O. Schmidt",
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Voss, R, Hinrichsen, H-H, Stepputtis, D, Bernreuther, M, Huwer, B, Neumann, V & Schmidt, JO 2011, 'Egg mortality: predation and hydrography in the central Baltic', ICES Journal of Marine Science, vol. 68, no. 7, pp. 1379-1390. https://doi.org/10.1093/icesjms/fsr061

Egg mortality: predation and hydrography in the central Baltic. / Voss, R.; Hinrichsen, H.-H.; Stepputtis, D.; Bernreuther, M.; Huwer, Bastian; Neumann, Viola; Schmidt, J.O.

In: ICES Journal of Marine Science, Vol. 68, No. 7, 2011, p. 1379-1390.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Egg mortality: predation and hydrography in the central Baltic

AU - Voss, R.

AU - Hinrichsen, H.-H.

AU - Stepputtis, D.

AU - Bernreuther, M.

AU - Huwer, Bastian

AU - Neumann, Viola

AU - Schmidt, J.O.

PY - 2011

Y1 - 2011

N2 - Cod and sprat are the dominant fish species in the Baltic pelagic ecosystem, both of great economic importance and ecologically strongly interlinked. Management of both species is challenged by highly variable recruitment success. Recent studies have identified predation and hydrographic conditions during the egg phase to be of critical importance. Two years of extensive field investigations in the Bornholm Basin, central Baltic Sea, were undertaken. In 2002, a typical stagnation situation characterized by low salinity and poor oxygen conditions was investigated, and in early 2003, a major inflow of North Sea water completely changed the hydrographic conditions by increasing salinity and oxygen content, thereby altering ecological conditions. The goal was to quantify egg mortality caused by predation and hydrography, and to compare these estimates with independent estimates based on cohort analysis. Results indicated high intra-annual variability in egg mortality. Cod and sprat egg mortality responded differently to the major Baltic inflow: mortality related to hydrographic conditions increased for sprat and decreased for cod. On the other hand, predation mortality during peak spawning decreased for sprat and increased for cod.

AB - Cod and sprat are the dominant fish species in the Baltic pelagic ecosystem, both of great economic importance and ecologically strongly interlinked. Management of both species is challenged by highly variable recruitment success. Recent studies have identified predation and hydrographic conditions during the egg phase to be of critical importance. Two years of extensive field investigations in the Bornholm Basin, central Baltic Sea, were undertaken. In 2002, a typical stagnation situation characterized by low salinity and poor oxygen conditions was investigated, and in early 2003, a major inflow of North Sea water completely changed the hydrographic conditions by increasing salinity and oxygen content, thereby altering ecological conditions. The goal was to quantify egg mortality caused by predation and hydrography, and to compare these estimates with independent estimates based on cohort analysis. Results indicated high intra-annual variability in egg mortality. Cod and sprat egg mortality responded differently to the major Baltic inflow: mortality related to hydrographic conditions increased for sprat and decreased for cod. On the other hand, predation mortality during peak spawning decreased for sprat and increased for cod.

U2 - 10.1093/icesjms/fsr061

DO - 10.1093/icesjms/fsr061

M3 - Journal article

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JO - I C E S Journal of Marine Science

JF - I C E S Journal of Marine Science

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Voss R, Hinrichsen H-H, Stepputtis D, Bernreuther M, Huwer B, Neumann V et al. Egg mortality: predation and hydrography in the central Baltic. ICES Journal of Marine Science. 2011;68(7):1379-1390. https://doi.org/10.1093/icesjms/fsr061