Northern conditions ok for some birds

Bird biologists Ron Pittaway and Jean Iron from Ontario recently compiled this excellent summary of reports about conditions in the Far North for birds that gives a more hopeful scenario for nesting success of many birds in the region. They graciously allowed me to reprint it below. Thanks Ron and Jean!

Jeff  

 ”Several people asked us to comment about recent reports of a “Disastrous breeding season in the Arctic”. The Arctic is huge; it is 3500 km from southern James Bay (subarctic) to northern Ellesmere Island. Most shorebirds have large breeding ranges and even in late years many birds breed successfully and rarely does the entire Arctic experience the same climatic conditions. We checked with northern researchers and summarized their comments below. Shorebird nesting in> 2009 is poor in some regions but normal to good elsewhere.

Ontario: Ken Abraham reports that conditions in the Hudson Bay Lowlands were about 10 days late from Attawapiskat south on James Bay, including Akimiski Island, with Canada Geese and Snow Geese hatching in mid June, more like the 1990s average than the 2000s average and within the overall norms. Other species on Akimiski Island were correspondingly late. His guess is that for those species that require shorter time there will be some reduction but not huge. Perhaps the predation effect will be somewhat greater if alternate species are less available. Because coastal snow, ice and water inundation conditions were similar from Cape Henrietta Maria to the Manitoba border, Ken expects that for Canada Geese nesting within 40-60 km from the coast, a much reduced effort and productivity will be the norm. Snow Geese at Cape Henrietta Maria were greatly down and the suggestion of a 90% reduction seems to fit what they saw on their survey. However, beyond 40-60 km inland, he thinks conditions will be different. Mark Peck said that species nesting away from the Hudson Bay Coast in boreal bogs and fens such as yellowlegs should not be severely impacted because much of the freeze took place near the coast.

Manitoba: The situation is worse in northern Manitoba at Churchill where temperatures were well below normal until recently and the snow cover melted late. However, Erica Nol reports that birds have started to nest, just very late, and it won’t be a complete bust for shorebirds if there are enough bare spots. Whimbrels and Hudsonian Godwits are nesting, but overall nesting success should be below average for most shorebirds in northern Manitoba.

Nunavut: Snow melt was up to three weeks late in mainland Nunavut north of Manitoba. Recent temperatures have been close to normal.  Much of Baffin Island is now snow free and conditions there and on Bylot Island are about normal. High Arctic breeders should have a good breeding year.

Northwest Territories: Vicky Johnston suspects it will be a poor breeding year in parts of the Western Arctic. Spring was roughly three weeks late in Yellowknife on Great Slave Lake based on leaf-out. The Mackenzie Valley and Delta warmed early but then cooled off again. The Delta flooded slowly and the water receded slowly, so some prime shorebird breeding areas were subject to heavy predation.

Yukon: Cameron Eckert reports a late spring, but once the heat came, everything shifted into high gear.

Alaska: Declan Troy reports from the North Slope that the snow on the tundra is long gone. It was much warmer earlier in the month and his guess is that the breeding season has been early there. 

Acknowledgements: We thank Ken Abraham, Bruce Di Labio, Cameron Eckert, Michel Gosselin, Vicky Johnston, Erica Nol, Mark Peck, Ken Ross, Don Sutherland, and Declan Troy. “

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>