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Sammanfattning

We analyse trends and dynamics in time-series of recruitment in Smelt and Vendace in the Swedish large Lakes Vanern and Vattern, with particular emphasis on the importance of climate variability. Climate-related predictor variables in our analyses were air temperature, water temperature, ice coverage and duration of ice winters. The variation between years with successful recruitment and years with low recruitment was considerable in both species and especially for Vendace. Ultra-oligotrophic Lake Vattern was characterized by strong pulses in Vendace recruitment, occurring mainly in four year intervals. Smelt recruitment was positively related to recruitment pulses of Vendace. In meso-oligotrophic Lake Vanern, Vendace pursuit was more successful in years with long ice winters that lasted until the middle of March or longer. Smelt recruitment in Lake Vanern was positively correlated to the air temperature in April. There was no obvious synchrony in recruitment patterns between the two lakes. Recruitment of Smelt in Lake Vanern's two main basins was, however, positively correlated. The results indicated that climate factors may influence the recruitment of important pelagic species, but that the effects may differ between lakes, even though the systems are adjacent and situated at the same latitude.

Nyckelord

large lakes; recruitment; Vendace; Smelt

Publicerad i

Aquatic Ecosystem Health and Management
2014, volym: 17, nummer: 4, sidor: 349-356

SLU författare

Associerade SLU-program

Sjöar och vattendrag

UKÄ forskningsämne

Klimatvetenskap
Miljövetenskap
Ekologi

Publikationens identifierare

  • DOI: https://doi.org/10.1080/14634988.2014.975668

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/63851