Náttúrufræðingurinn - 2009, Blaðsíða 54

Náttúrufræðingurinn
54
Þakkir
Grant Gilchrist og David Irons liðsinntu við útvegun útbreiðslukorta, sem
eru hér endurbirt með góðfúslegu leyfi CBIRD-samtakanna. Flemming
Merkel og Greg Robertson veittu góð ráð og svörðu spurningum um
verndarstöðu æðarkóngs.
Heim ild ir
Goudie, R.I., Kondratyev, A.V., Brault, S., Petersen, M.R., Conant, B. & 1.
Vermeer, K. 1994. The status of sea ducks in the North Pacific Rim.
Toward their conservation and management. Transactions of the fifty-
ninth North American Wildlife and Natural Resources Conference.
Wildlife Management Insitute, Washington DC.
Conservation of Arctic Flora and Fauna 1997. Circumpolar eider conser-2.
vation strategy and action plan. Lögð fram af Circumpolar Seabird
Working Group, júní 1997. 16 bls.
Suydam, R.S. 2000. King Eider (3. Somateria spectabilis). Í: The Birds of
North America, No. 491 (ritstj. Poole, A. & Gill, F.). The Birds of North
America, Inc., Philadelphia.
IPCC 2001. Climate Change 2001. Synthesis Report. A Contribution of 4.
Working Groups I, II, and III to the Third Assessment Report of the
Intergovernmental Panel on Climate Change [Watson, R.T. og kjarna-
teymi sérfræðinga (ritstj.)]. Cambridge University Press, Cambridge &
New York. 398 bls.
Serreze, M.C., Walsh, J.E., Chapin, F.S. o.fl. 2000. Observational evidence 5.
of recent change in the northern high-latitude environment. Climatic
Change 46. 159–207.
Lehikoinen, A., Kilpi, M. & Öst, M. 2006. Winter climate affects subse-6.
quent breeding success of common eiders. Global Change Biology 12.
1355–1365.
Newton, I. 1998. Population limitation in birds. Academic Press, San 7.
Diego.
Merkel, F.R. 2004. Evidence of population decline in common eiders 8.
breeding in Western Greenland. Arctic 57. 27–36.
Gaston, A.J. 2004. Seabirds. A Natural History. Poyser Monographs. 9.
A&C Black Publishers Ltd, London.
Hario, M. & Rintala, J. 2006. Fledgling production and population trends 10.
in Finnish common eiders (Somateria mollissima mollissima) – evidence for
density dependence. Canadian Journal of Zoology 84. 1038–1046.
Anderson, M.G., Rhymer, J.M. & Rohwer, F.C. 1992. Philopatry, dispersal, 11.
and the genetic structure of waterfowl populations. Í: Ecology and man-
agement of breeding waterfowl (ritstj. Batt, B.D.J., Afton, A.D., Anderson,
M.G., Ankney, C.D., Johnson, D.H., Kadlec, J.A. & Krapu, G.L.). Univer-
sity of Minnesota Press, Minneapolis. Bls. 365–395.
Phillips, L.M. & Powell A.N. 2006. Evidence for wing molt and breeding 12.
site fidelity in King Eiders. Waterbirds 29. 148–153.
Systad, G.H., Bustnes, J.O. & Erikstad, K.E. 2000. Behavioral responses to 13.
decreasing day length in wintering sea ducks. Auk 117. 33–40.
Livezey, B.C. 1995. Phylogeny and Evolutionary Ecology of Modern 14.
Seaducks (Anatidae. Mergini). Condor 97. 233–255.
Heath, J.P., Gilchrist, H.G. & Ydenberg, R.C. 2006. Regulation of stroke 15.
pattern and swim speed across a range of current velocities: diving by
common eiders wintering in polynyas in the Canadian Arctic. Journal of
Experimental Biology 209. 3974–3983.
Phillips, L.M, Powell, A.N. & Rexstad, E.A. 2006. Large-scale movements 16.
and habitat characteristics of King Eiders throughout the nonbreeding
period. Condor 108. 887–900.
Goudie, R.I., Robertson, G.J. & Reed, A. 2000. Common Eider (17. Somateria
mollissima). Í: The Birds of North America, No. 546 (ritstj. Poole, A. & Gill,
F.). The Birds of North America, Inc., Philadelphia.
Hipfner, J.M., Gilchrist, H.G., Gaston A.J. & Cairns, D.K. 2002. Status 18.
of common eiders, Somateria mollissima, nesting in the Digges Sound
Region, Nunavut. Canadian Field-Naturalist 116. 22–25.
Cramp, S. & Simmons, K.E.L. 1978. Handbook of the birds of Europe, the 19.
Middle East, and North Africa. Birds of the Western Palearctic. Oxford
University Press, Oxford.
Fredrickson, L.H. 2001. Steller’s Eider (20. Polysticta stelleri). Í: The Birds of
North America, No. 571 (ritstj. Poole, A. & Gill, F.). The Birds of North
America, Inc., Philadelphia.
Ævar Petersen & Karl Skírnisson 2001. Lifnaðarhættir æðarfugla á 21.
Íslandi. Bls. 13–46 í: Æðarfugl og æðarrækt á Íslandi (ritstj. Jónas Jóns-
son). Mál og mynd, Reykjavík.
Chaulk, K., Robertson, G.J., Collins, B.T., Montevecchi, W.A. & Turner, B. 22.
2005. Evidence of recent population increases in common eiders breed-
ing in Labrador. Journal of Wildlife Management 69. 750–754.
Arnþór Garðarsson 1982. Endur og aðrir vatnafuglar. Í: Fuglar. Rit Land-23.
verndar 8. Landvernd, Reykjavík. Bls. 77–111.
Jónas Jónsson 2001. Æðarfugl og æðarrækt á Íslandi. Mál og mynd, 24.
Reykjavík.
Olsson, E.G.A. & Thorvaldsen, P. 2006. The eider conservation paradox 25.
in Tautra – a new contribution to the multidimensionality of the agricul-
tural landscapes in Europe. Environmental Science & Policy 9. 343–349.
Jón Einar Jónsson, Arnþór Garðarsson, Jenny A. Gill, Ævar Petersen & 26.
Tómas G. Gunnarson 2009. Seasonal weather effects on the common
eider, a subarctic capital breeder, in Iceland over 55 years. Climate
Research 38. 237–248.
Arnþór Garðarsson í pentun. Fjöldi æðarfugls, hávellu, toppandar og 27.
stokkandar á grunnsævi að vetri. Bliki.
Robertson, G.J. & Gilchrist, H.G. 1998. Evidence of population declines 28.
among common eiders breeding in the Belcher Islands, Northwest
Territories. Arctic 51. 378–385.
Dickson, D.L. & Gilchrist, H.G. 2002. Status of marine birds of the south-29.
eastern Beaufort Sea. Arctic 55. 46–58.
JMMB 2007. Trends of migratory and wintering waterbirds in the 30.
Wadden Sea 1987/88–2005/06. www.waddensea-secretariat.org,
Wilhelmshaven (skoðað 24. nóvember 2008).
Eaton, M.A., Balmer, D., Burton, N., Grice, P.V., Musgrove, A.J., Hearn, 31.
R., Hilton, G., Leech, D., Noble, D.G., Ratcliffe, N., Rehfisch, M.M.,
Whitehead, S. & Wotton, S. 2008. The state of the UK’s birds 2007. RSPB,
BTO, WWT, CCW, EHS, NE & SNH, Sandy, Bedfordshire.
British Trust for Ornithology. 2008 The Wetland Bird Survey (WeBS). 32.
http://www.bto.org/webs/alerts/alerts2008/Results/UK9006011/
E0Trends.htm (skoðað 25. nóvember 2008.
Christensen, K.D. & Falk, K. 2001. Status of the common eider breeding 33.
in the municipality of Avanersuaq (Thule), north-west Greenland. Polar
Research 20. 109–114.
Merkel, F.R., Mosbech, A., Gilchrist, H.G. & Descamps, S. 2008. Recent 34.
population trends of common eiders nesting in Northwest Greenland as
derived from a community-based monitoring program. North American
Seaduck Conference, Quebec, nóvember 2008.
Suydam, R.S., Dickson, D.L., Fadely, J.B. & Quakenbush, L.T. 2000. Popu-35.
lation declines of King and Common Eiders of the Beaufort Sea. Condor
102. 219–222.
Mosbech, A. & Boertmann, D. 1999. Distribution, abundance and reac-36.
tion to aerial surveys of post-breeding King Eiders (Somateria spectabilis)
Summary
Population overview of
eider ducks
Seabird populations are much discussed
because of possible impacts of global
climate change. Eider ducks (Somatereae)
are a monophyletic group comprised of
four species of specialized ducks that all
live along the Arctic coastline. Most
populations are listed as of special con-
cern with a few exceptions, notably the
Common Eider (Somateria mollissima) in
Iceland. The other species are King Eider
(S. spectabilis), Spectacled Eider (S.
fischeri) and Steller’s Eider (Polysticta
stelleri). Many populations are hunted,
especially those of Common Eider and
King Eider, where over-harvest has been
implicated as the cause of population
declines. All eider duck species face dis-
turbances from human activities, i.e.
from oil spills, contaminants, and drown-
ing in gill-nets. Climate change might
increase the occurrences of inclement
weather at the highest latitudes, which is
likely to negatively impact eiders.
However, reduced sea ice near breeding
grounds could be beneficial on a local
scale. Eider duckling survival is rela-
tively low during first days of life be-
cause they are sensitive to food shortage,
weather and predators during that time.
However, there are few data that indi-
cate that production limits eider duck
populations because adult survival is
the key factor for population stability
among long-living species. Future re-
search is critical as future prospects of
eider ducks greatly depend on impend-
ing changes and human activities
throughout their range.