Is premigratory gill Na+/K+-ATPase activity related to migratory behaviour?
In the two tributaries, no relationship between future migratory strategy (i.e. whether individuals became migrants or residents) and gill Na+/K+-ATPase activity was found in late February early March (P>0.05, N=188=163 migrants + 25 residents; Fig. 1A). By contrast, in mid-April, a highly significant logistic regression equation was obtained (P<0.000001, r2=0.64, a=1.573, b= 6.009, N=75=60 migrants + 15 residents; Fig. 1B). Based on the single mid-April measurement of gill Na+/K+-ATPase activity of individual fish, the fitted regression equation correctly identified 97% of the 60 future migrants, meaning individuals that actually migrated 1 42 days (median 13 days) after the gill biopsies were taken in mid-April. Of the 15 future residents, meaning individuals that remained resident 56 57 days after the mid-April sampling, 80% were correctly identified. Hence, the regression equation correctly identified the migratory strategy in 93% of the 75 individuals studied.
In the two tributaries, no relationship between future migratory strategy (i.e. whether individuals became migrants or residents) and gill Na+/K+-ATPase activity was found in late February–early March (P>0.05, N=188=163 migrants + 25 residents; Fig. 1A). By contrast, in mid-April, a highly significant logistic regression equation was obtained (P<0.000001, r2=0.64, a=1.573, b=–6.009, N=75=60 migrants + 15 residents; Fig. 1B). Based on the single mid-April measurement of gill Na+/K+-ATPase activity of individual fish, the fitted regression equation correctly identified 97% of the 60 future migrants, meaning individuals that actually migrated 1–42 days (median 13 days) after the gill biopsies were taken in mid-April. Of the 15 future residents, meaning individuals that remained resident 56–57 days after the mid-April sampling, 80% were correctly identified. Hence, the regression equation correctly identified the migratory strategy in 93% of the 75 individuals studied.
Related Questions
- I have taken Organizational Behaviour and Marketing courses at another post secondary institution. How do I find out if I qualify for an exemption from Organizational Behaviour and Marketing?
- If a Hopkins physician earns credit elsewhere by attending or participating in a CME activity, is Hopkins going to track these credits for him/her?
- Can the regression model for trout from the tributaries predict future migratory behaviour of trout from the mainstream?
