Bjarke Laubek
VisibilityWind speedBird migrationPopulationAltitude
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Publications 6
1 CitationsSource
#1Mads Bech-HansenH-Index: 1
Last. Cino PertoldiH-Index: 29
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Behavioural instability is a newly coined term used for measuring asymmetry of bilateral behavioural traits as indicators of genetic or environmental stress. However, this concept might also be useful for other types of data than bilateral traits. In this study, behavioural instability indices of expected behaviour were evaluated as an indicator for environmental stress through the application of aerial photos of foraging flocks of geese. It was presumed that geese would increase anti-predator b...
1 CitationsSource
#1Bjarke LaubekH-Index: 2
#2Preben ClausenH-Index: 3
Last. Anthony D. FoxH-Index: 29
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Internationally coordinated censuses of Whooper Swans Cygnus cygnus across continental northwest Europe were undertaken in mid-winter 1995, 2000, 2005, 2010 and 2015. The estimate of 138,500 birds in 2015, the highest to date, represented a more than doubling of the population size (at an annual increase of 4.1%) since the first census total of 59,000 swans in 1995. The largest increase was in Denmark, where numbers almost trebled from 21,740 in 1995 to 62,620 in 2015. More than 97% of all swans...
#2K. KoffijbergH-Index: 3
Last. Eileen C. ReesH-Index: 9
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Coordinated international censuses of the Northwest European Bewick’s Swan Cygnus columbianus bewickii population have been undertaken across the swans’ wintering range at c. 5-year intervals since 1984. During the early years of the study, numbers increased steadily to a peak of 29,780 individuals in January 1995, but then declined by 39.4% to 18,057 swans counted in January 2010 before showing a partial recovery to 20,149 recorded in January 2015. Changes in distribution across the wintering r...
#1Henrik SkovH-Index: 36
#2Mark DesholmH-Index: 8
Last. Bo Præstegaard JensenH-Index: 2
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Monitoring of bird migration at marine wind farms has a short history, and unsurprisingly most studies have focused on the potential for collisions. Risk for population impacts may exist to soaring...
2 CitationsSource
#1Johnny KahlertH-Index: 15
#2Aivar LeitoH-Index: 8
Last. Aarne LuudH-Index: 1
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We studied the effects of weather conditions, temporal factors and distance to coast on the flight altitude of migrating waterbirds in Western Estonia. We used a laser range finder and marine surveillance radar to measure flight altitudes, and identified significant effects on avian flight altitude by several weather components, particularly wind conditions, visibility and cloud cover. Wind components played a particularly significant role. Tailwinds were generally associated with elevated fligh...
7 Citations