After 2014’s disastrously low chick production owing to black fly infestation, I was anxious that breeding success would rebound in 2015. My concern defied reason. Loons are long-lived, of course, and a few or even several consecutive years of below-average chick production are not enough to have a lasting negative impact on the population. Still, blinded by the irrational human tendency to infer long-term impacts from short-term patterns, I wished to see our loon pairs come back and raise many chicks in 2015, just as Linda Grenzer’s pair has (see photo).
This year is shaping up to be a very good year indeed. As of this date, 31 of the 120 territories we follow (25.8%) have already hatched chicks. In contrast, only 2 breeding pairs (of 112 pairs; 1.8%) had chicks on this date in 2014. That is an unfair comparison, because the black flies devastated early nests in 2014. However, 2013 was a rather good year for chick production, and in 2013 only 20 of 108 pairs we followed (18.5%) had chicks on this date. Although these data are slightly biased because of yearly differences in nesting schedules — that is, 2013 was a slightly later year than this year — 2015 should be an awfully productive breeding season for loons in northern Wisconsin. As a scientist, I am breathing a huge, sheepish sigh of relief!