Náttúrufræðingurinn - 2010, Síða 123

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Tímarit Hins íslenska náttúrufræðifélags
similar to those of other European popu-
lations (55–60% males). Winter sex ratios
of these species were similar to those of
breeding birds, which indicates that the
sexes do not segregate in residential
duck populations in Iceland. The dis-
tance to the mainland probably explains
why these populations are residential in
Iceland. However, all three species pair
relatively early, which in turn precludes
males from excluding females from pre-
ferred wintering areas for longer than
1–2 months. Residential populations of
Icelandic ducks, all of which pair early in
winter, may have taken the first evolu-
tionary steps towards speciation similar
to the “Island waterfowl” in the Southern
Hemisphere.
Þakkir
Kveikjan að þessari grein varð til þegar ég var meistaranemi á árunum
1997–2000, undir leiðsögn Arnþórs Garðarssonar. Er Arnþóri þökkuð leiðsögn
og hvatning, hér eftir sem hingað til. Erpur Snær Hansen las yfir handritið og
færði ýmislegt til betri vegar.
Heim ild ir
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