The Piitaistakis (South Livingstone Ridge)and Mt. Lorette Raptor Counts for the spring migration of 2010 are underway. Follow the daily movement of raptors in these field notes by Research Director Peter Sherrington and his citizen scientist colleagues.

Sunday, March 7, 2010

March 7 [Day 20] (Valley View site) For the 7th straight day the temperature reached 10C, from a low of 2C. Ground winds started N-NNW and gradually backed to NW at 1400 then W after 1700 gusting 20-25 km/h throughout the day. Ridge winds similarly backed from WNW to W and were moderate to noon after which they were moderate to strong. Cloud cover was 0-70% altocumulus all day, with considerable periods of pure blue sky over the Livingstone Ridge in the afternoon which made observation challenging. The first migrant was an adult Golden Eagle at the remarkably early time of 0710, with the 2nd, 3rd and 4th birds at 0928, 1009 and 1130 respectively, but subsequent movement was fairly sustained, with a slowdown only between 1400 and 1600, and the last Golden Eagle went high to the south at 1820 which is the latest bird so far this season. The total of 50 migrants is the highest daily count so far this season, as is the total of 45 Golden Eagles (42a,2sa,1j). The only other migrant raptors were 3 Bald Eagles (2a,1j) and 2 adult Northern Goshawks. After moving strongly for much of the season, Bald Eagles have been scarce in the last couple of days coincident with a marked increase in Golden Eagle numbers. 11.58 hours (222.3) BAEA 3 (132), NOGO 2 (14), GOEA 45 (212) TOTAL 50 (374)

Mount Lorette [Day 7] (Bill Wilson) The temperature reached a season high 13C from a low of -8C, ground winds were light SW occasionally gusting 20 km/h and ridge winds were probably moderate W. It was cloudless in the morning, but cirrus and then altostratus cloud developed throughout the afternoon reaching 80-100% and provided good observing conditions. The numbers of migrating raptors and the flight dynamic was remarkably close to that at Piitaistakis-South Livingstone with 43 birds counted between 0912 and 1822 with fairly steady movement between those times. The flight comprised 3 adult Bald Eagles, 1 unaged Northern Goshawk that mobbed a Golden Eagle over a considerable distance as they moved to the NW together, and 39 Golden Eagles (31a,1sa,7u). Both the combined species and Golden Eagle totals are season high counts for the site. 12 hours (7.33) BAEA 3 (18), NOGO 1 (6), GOEA 39 (76) TOTAL 43 (107)

No comments:

Post a Comment

Blog Archive