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First published online December 22, 2003
Journal of Experimental Biology 207, 527-533 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00783

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Future migratory behaviour predicted from premigratory levels of gill Na⁺/K⁺-ATPase activity in individual wild brown trout (Salmo trutta)

Christian Nielsen^1,*, Kim Aarestrup², Ulrik Nørum¹ and Steffen S. Madsen¹

¹ Institute of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
² Danish Institute for Fisheries Research, Vejlsøvej 39, 8600 Silkeborg, Denmark

View larger version (12K): [in a new window]   Fig. 1. Premigratory gill Na+/K+-ATPase activity and future migratory behaviour in wild brown trout from the two tributaries (River Granslev Aa and Haldum Brook) in (A) late February–early March (163 future migrants and 25 future residents) and (B) mid-April (60 future migrants and 15 future residents). The solid line in B indicates the probability of future migration as a function of premigratory gill Na+/K+-ATPase activity, as determined by logistic regression analysis.

View larger version (20K): [in a new window]   Fig. 2. Premigratory gill Na+/K+-ATPase activity and future migratory behaviour in wild brown trout from the mainstream (River Lille Aa) in early April (88 future migrants and 16 future residents). The solid line indicates the probability of future migration as a function of premigratory gill Na+/K+-ATPase activity, as determined by logistic regression analysis on mainstream data. For comparison, the broken line indicates the logistic regression curve for mid-April in the tributaries.

View larger version (25K): [in a new window]   Fig. 3. Premigratory gill Na+/K+-ATPase activity and number of days from April sampling to migration (147 migrants in total from tributaries, River Granslev Aa and Haldum Brook, and mainstream, River Lille Aa). The solid line indicates the non-significant (P=0.31) linear regression curve.

View larger version (20K): [in a new window]   Fig. 4. Predicting migratory behaviour in wild brown trout in the mainstream (River Lille Aa). Numbers of predicted (broken lines) and actual (solid lines) future migrants and residents in the mainstream (River Lille Aa) as a function of threshold probability of migration (or threshold gill Na+/K+-ATPase activity), as predicted from the logistic regression equation relating premigratory gill Na+/K+-ATPase activity in mid-April and future migratory behaviour of wild brown trout from the two tributaries (Haldum Brook and River Granslev Aa).