I did a long stint at the nest site today timing the birds brooding sessions. The female is still staying away from the nest for longer than the male, with the female appearing to average about 2 hours, while the male seems to return after about an hour and a quarter. Although she does shorter sessions, the female does seem to be more settled while brooding. The male will often leave the nest briefly during his brooding stint and catch a fish before returning to the nest, while so far I’ve never seen the female leave the nest before being relieved.
During one of the handovers the male seemed to get spooked just after arriving at the site and calling to the female. He flew off upstream, and the female exited the nest a few seconds later and left to hunt. Throughout the following 2 hours the male returned to the nest but wouldn’t settle in the burrow. Despite entering the nest several times he immediately came out and hovered near the nest bank calling. It seemed to me that whatever disrupted the changeover had completely thrown him, and without seeing the female exiting the burrow he seemed unwilling to enter it. Eventually the female returned, entered the burrow and settled immediately, while the male left the site without having done any brooding. I stayed to watch the next changeover and this time everything went smoothly with the male entering the burrow immediately and settling, after the female had exited it.
Hopefully, this little blip won’t have any ill effects on the young which should be ready to emerge from the eggs within the next few days.