Quantifying predation on Baltic cod early life stages
| Autor: | U. Böttcher, Margit Eero, Viola Neumann, Matthias Schaber, Friedrich W. Köster |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
biology Sprattus sprattus Reproductive success Ecology 010604 marine biology & hydrobiology Sprat Clupea Aquatic Science biology.organism_classification 010603 evolutionary biology 01 natural sciences Predation Fishery Herring Gadus Predator Ecology Evolution Behavior and Systematics |
| Zdroj: | Neumann, V, Schaber, M, Eero, M, Böttcher, U & Köster, F 2017, ' Quantifying predation on Baltic cod early life stages ', Canadian Journal of Fisheries and Aquatic Sciences, vol. 74, no. 6, pp. 833-842 . https://doi.org/10.1139/cjfas-2016-0215 |
| ISSN: | 1205-7533 0706-652X |
| DOI: | 10.1139/cjfas-2016-0215 |
| Popis: | Predation on cod (Gadus morhua) eggs by sprat (Sprattus sprattus) and herring (Clupea harengus) is known to be one of the processes influencing reproductive success of the eastern Baltic cod and has been reported to have contributed to lack of recovery of the stock in the 1990s. This study quantifies the predation on cod eggs in the Bornholm Basin, the major spawning area of cod in the central Baltic Sea, in the 1990s in comparison with the second half of the 2000s. The analyses involve estimating daily consumption rates of predator populations, which are then compared with corresponding daily egg production rates. As a methodological advancement compared with earlier studies, spatially resolved information on predator distribution and abundance is utilized in quantifying predator stock size. This resulted in more realistic consumption estimates in relation to overall egg production compared with earlier studies that consistently overestimated predation pressure by clupeids. Our results suggest a generally lower predation pressure on cod eggs in the mid- to late 2000s, due to a combination of reduced predator abundance and lower daily rations by individual predators. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|