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Hatch or Not to Hatch
Hatch or Not to Hatch?
Data and Key Resources:
Eagles in Denali
Eagle Fact Sheet 2000. Carol McIntyre (available in PDF)
Ecosystem - Who eats what? (355K pdf)
Denali hare and ptarmigan
abundance data, pdf
- Denali golden eagle reproduction data 1988 - 2000, Carol McIntyre
data, tabular (pdf)
data, graphed (pdf)
and summary data in Excel97
Data Worksheet for Denali Golden Eagles
National Park and Preserve homepage
maps of the United States
a pair of golden eagles that are incubating eggs.
a pair of golden eagles that are occupying a nesting territory,
but have not laid eggs that year.
a nesting pair of golden eagles that has fledglings.
an area containing one or more nests that belonged to one pair of
eagles in a year. An eagle pair may have several nests in their
territory and use different nests in different years.
a nesting territory that has a nesting pair of golden eagles in
one of the nests.
chicks that are less than 51 days old.
chicks that are 51 or more days old. We assume that almost every
chick that lives to 51 days fledges.
rate - how many of the nests are being used by a territorial
pair of eagles. This is calculated by dividing the number of occupied
nesting areas (those with territorial pairs) by the number of nesting
areas that were observed during the April survey.
rate - how many pairs of eagles are breeding (as seen by nesting
behavior) - by dividing the number of nesting pairs of eagles by
the number of territorial pairs of eagles.
rate - how many of the nesting pairs have fledglings. The success
rate is calculated by dividing the number of successful pairs of
eagles (eagles that have fledglings) by the number of nesting pairs.
brood size - is the average number of fledglings per successful
pair calculated by dividing the total number of fledglings by the
number of successful pairs.
- the rate of production of golden eagles (fledglings) by the population
of golden eagles in Denali. Productivity is calculated by dividing
the number of fledglings by the number of territorial pairs. The
following table shows an example of the type of data collected by
Denali's scientists each year.
Clutch Size: the
number of eggs laid by a nesting pair
Brood Size: the
number of nestlings produced by a nesting pair
Bird Observatory (http://www.alaskabird.org)
Department of Fish and Game, natural history information (http://www.state.ak.us/local/akpages/FISH.GAME/notebook/notehome.htm)
an expert" - Science mentors to which students can address
Migration Ecology, University of Lund, Sweden. (http://orn-lab.ekol.lu.se/birdmigration)
of Denali (http://www.nps.gov/dena/home/resources/wildlife/birdweb/
index/homebirdpage.htm) Denali National Park and Preserve page
includes species, habitat, and research.
Bird Survey Homepage (http://www.mbr-pwrc.usgs.gov/bbs/)
Bird Count (http://birdsource.cornell.edu/cbc/)
Laboratory of Ornithology, Bird of the Week: (http://www.ornith.cornell.edu/BOW/)
of Avian Terms (http://www.npwrc.usgs.gov/resource/literatr/avian/avian.htm)
to the Aves, Museum of Paleontology, University of California, Berkeley
Audubon Society (http://www.audubon.org/)
Audubon Watchlist, Conservation of Birds (http://www.audubon.org/bird/watch)
history information on forest and rangeland birds (http://www.npwrc.usgs.gov/resource/1998/forest/history.htm#aegit)
of Migratory Bird Management, US Fish and Wildlife Service (http://migratorybirds.fws.gov)
Forest Albatross project (http://www.wfu.edu/albatross/activity.htm)
Wings - tracking snow geese on the net (http://north.audubon.org/how.html)
Notebook Series, Alaska Department of Fish and Game (http://www.state.ak.us/local/akpages/FISH.GAME/notebook/notehome.htm)
Alerstan, T. 1993. Bird
Migration. Cambridge University Press. 420 pp.
Anderson, C. Alaska's
Magnificent Eagles. 1997. Alaska Geographic.
Archer, P. 1995. How
Birds Migrate. Stackpole Books, Mechanicsburg PA.
Berthold, P. 1993. Bird
Migration, a general survey. Oxford University Press. 239 pp.
Cooper, A.C. 1992. Eagles,
Hunters of the Sky, A Story and Activities. Denver Museum of
Natural History. Robts. Rinehart Publishers. Niwat, CO.
Donnelly E. and J. Wiley.
1996. Journey North: A distance learning adventure. CPB Math and
Science Collection. Washington D.C.
Kerlinger, P. 1989. Flight
Strategies of Migrating Hawks. University of Chicago Press. 375
Kerlinger, P. 1995. How
Birds Migrate. Stackpole Books. 228 pp.
Uspenskii, S.M. 1984.
Life at High Latitudes, a study of bird life. U.S. Deptartment of
Interior and the National Science Foundation. Amerind Printing.
Weidensaul, S. 1999.
Living on the Wind - Across the hemisphere with migratory birds.
North Point Press.
Life of Birds.1999. David
Attenborough. BBC Video, Worldwide America.
Eagles, Masters of the
Skies. 1998. John Downer. PBS Home Video.