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Getting cosy in freshwater: Assumed to be brackish pike are not so brackish after all
- Source :
- Birnie-Gauvin, K, Højrup, L B, Kragh, T, Jacobsen, L & Aarestrup, K 2019, ' Getting cosy in freshwater : assumed to be brackish pike are not so brackish after all ', Ecology of Freshwater Fish, vol. 28, no. 3, pp. 376-384 . https://doi.org/10.1111/eff.12460, Birnie-Gauvin, K, Højrup, L B, Kragh, T, Jacobsen, L & Aarestrup, K 2018, ' Getting cosy in freshwater: assumed-to-be brackish pike are not so brackish after all ', Ecology of Freshwater Fish, vol. 28, no. 3, pp. 376-384 . https://doi.org/10.1111/eff.12460
- Publication Year :
- 2018
- Publisher :
- Wiley, 2018.
-
Abstract
- Pike (Esox lucius) occupy coastal streams and rivers of the Baltic Sea, where they attain large sizes (>5 kg). These large sizes are perhaps due to the fact that they can tolerate relatively high salinities and can thus forage in the nearby more productive brackish environments. In an attempt to quantify the extent to which pike utilise brackish environments, and to provide some insight into the underlying causes for brackish water migrations, we tagged 30 pike from a western Baltic river with acoustic transmitters and were able to track 21 individuals for 1 year. Based on experienced from local anglers, this population was assumed to be brackish in nature, where individuals underwent freshwater migrations to spawn. Our findings however suggest that the smallest and most active individuals make short exits into brackish waters and do so on rare occasions. Our results further indicate that neither sex nor size is related to activity level. We suggest that these patterns reflect two distinct behaviours—active and passive—and that large pike can be supported by the food availability in the river, without the need to venture into coastal zones, thus defying the conventional view that Baltic pike are all brackish in nature.
- Subjects :
- 0106 biological sciences
Population
reproductive migrations
STREAMS
Aquatic Science
010603 evolutionary biology
01 natural sciences
Ecosystem
freshwater
education
Ecology, Evolution, Behavior and Systematics
Esox
SDG 15 - Life on Land
Pike
computer.programming_language
education.field_of_study
Ecology
biology
Brackish water
010604 marine biology & hydrobiology
Aquatic animal
biology.organism_classification
Spawn (biology)
Esox lucius
Geography
ecosystem functioning
brackish
computer
Subjects
Details
- ISSN :
- 16000633 and 09066691
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Ecology of Freshwater Fish
- Accession number :
- edsair.doi.dedup.....530601a591a2334a5a869813c1d19d05