Duiktijden van enkele vogels op binnenlandse wateren

Mainly during the winters 1983/84 till 1985/86 diving times were recorded of some birds on inland waters in the surroundings of Nijmegen. Diving times were recorded for 24 species diving in rivers, pools, ditches (Little Grebe), fens (Tufted Duck). In observing the diving birds the author became aware of influences on the diving times. Those influences can maybe made clear by systematic recordings in which diving time recording can be useful and this is further discussed.