First glimpse of breeding conditions at Slettnes

After a very windy first few days at Slettnes (without our luggage) weather somewhat improved. For the Arctic Skuas, improvement is however not (yet) apparent when it comes to the predation compared to last year: several eggs disappeared right after laying (also nests that we did not visit). This complicates the field work considerably, because our main aim, catching as many birds with geolocators, becomes difficult if the birds have no nest.

However, the good news is that food availability seems to be somewhat better than during the previous years. We deduce this from the foraging activity out at sea, where flocks of gulls and Razorbills were actively feeding over the past days. Also, the few skua eggs that we measured are slightly larger than in the past three years. A good food situation should also be reflected in the body mass of the skuas. From the two  individuals that we recaptured (one carrying a geolocator), the female ‘EU’ was indeed heavier than ever: she weighted 508g, 466g, 455g in 2014, 2015 and 2016, respectively, and weighted 534g this Thursday! However, the other bird, ‘EY’ (a male, thus lighter anyway), had a weight similar as in the other years (391-428g in 2014-2016, and 412 this year).

DSC03178_EG
EG in windy conditions.

In the coming days, we are hoping to retrap more birds with geolocators. As the batteries of the loggers are running out (most were manufactured in 2014-2015), they will stop recording soon, if they not already did so. Over the past years, we obtained multiple years of data from quite some individuals, and now they will finally be released from their loggers!

One thought on “First glimpse of breeding conditions at Slettnes

  1. Daan June 11, 2018 / 1:31 pm

    veel succes daar Rob! Daan L

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