Larsson, Stig
- Institutionen för vattenbruk, Sveriges lantbruksuniversitet
Sammanfattning
1. Experimental growth data for Arctic charr (Salvelinus alpinus L.), all fed on excess rations, from 11 European watercourses between 54 and 70degreesN were analysed and fitted to a new general growth model for fish. The model was validated by comparing its predictions with the growth rate of charr in the wild. 2. Growth performance varied among populations, mainly because of variation in the maximum growth potential, whereas the thermal response curves were similar. The estimated lower and upper temperatures for growth varied between -1.7 to 5.3 and 20.8-23.2degreesC, respectively, while maximum growth occurred between 14.4 and 17.2degreesC. 3. There was no geographical or climatic trend in growth performance among populations and therefore no indication of thermal adaptation. The growth potential of charr from different populations correlated positively with fish body length at maturity and maximum weight in the wild. Charr from populations including large piscivorous fish had higher growth rates under standardised conditions than those from populations feeding on zoobenthos or zooplankton. Therefore, the adaptive variation in growth potential was related to life-history characteristics and diet, rather than to thermal conditions.
Nyckelord
adaptive variation; countergradient variation; food consumption; models; optimum temperature
Publicerad i
Freshwater Biology
2005, volym: 50, nummer: 2, sidor: 353-368
Utgivare: BLACKWELL PUBLISHING LTD
SLU författare
Berglund, I
- Institutionen för vattenbruk, Sveriges lantbruksuniversitet
- Institutionen för vattenbruk, Sveriges lantbruksuniversitet
UKÄ forskningsämne
Fisk- och akvakulturforskning
Publikationens identifierare
- DOI: https://doi.org/10.1111/j.1365-2427.2004.01326.x
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/6170