Alaska field notes, v4436
Page 189
Image from the Biodiversity Heritage Library. Contributed by Museum of Vertebrate Zoology, University of California, Berkeley. | www.biodiversitylibrary.org
Transcription
SP Myers 1976 Calidris melanotos GRID 2 30 June see Journal. next one met has hatched, probably today. 1 July Typical hoot today except over 4 w/ chicks ?? Ø had been harassing here, + then feeding nearby. Shot precum on mound, then took off into the wind, circled around, + looked stop here [Diagram: hand-drawn sketch with labels including "wind from W", "position of 4", "storking position of 3", "flap", "soar", "pump", "flap", "soar", "flap"] After the pumping stroke during the terminal portion of the hoot—the male soars, turning from into the wind — , often describing a large circle as reflected in the diagram above, landing very near the point of take off, occasionally frequently precisely on the same mound, but occasionally shifting this focus of attention to another area. During the soaring motion the tail is fanned and appears to function significantly in steering, as it is shifted about the bird's longitudinal axis, changes angle w.r.t. to current horizontal. 2 July Clear flight of 8 after a high bird exhibits sustained power flight — . The bird ascends up to 50–70 meter height, flies beyond the territory borders, then begins sweeping an arc about, often sliding, and returns to the territory. The 8 which I followed this a.m. is not a good hooter. Its voice is higher, unsure—missing notes when from its anatomy I would expect it to hoot. FAP would call this a 1st year bird, part of the 3rd week of June wave. But is it? The resident Ø here has been absent for several days, or at least we have not been able to find it. An equally plausible hypothesis is that the same individual has returned after a brief trip, during which its prental sac — [illegible] — began to “recede.” Ah for some banded birds. The bird is cruising over an area fairly similar to old bird i.e., here except that it is definitely expanded. This Ø’s prefrontal sac is dark + well developed — [illegible]