Monday, October 17, 2011

Four-spotted Skimmer

On 21 July 2011, I found this Four-spotted Skimmer defending territory atop a large brush pile at the Northfield compost center. Males defend territories against other males and even other species. This skimmer has a holarctic distribution--it is found throughout Europe, Asia, and North America. The Four-spotted Skimmer is Alaska's state insect.

Unlike the sedentary North American populations, European Four-spotted Skimmers migrate (usually in 10 to 15 year cycles). These migrations, which are in unpredictable directions, may be triggered by parasitic trematodes. Possibly the migrations serve to disperse the parasites (Wikipedia).

No comments:

Post a Comment