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Leif Nilsson Lund University Ecology Building S-223 62 Lund Sweden [email protected]
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Population estimates and trends
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Staging Population & Trend
0
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1977 1980 1983 1986 1989 1992 1995 1998 2001 2004 2007 2010
Rossicus
Fabalis
TOT
Bean Goose October Sweden
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How to separate tundra and taiga Beans in dense flocks ??
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• True Taiga Bean Goose numbers during counts
• Training of observers to separate tundra/taiga geese
• Coordinated counts over the entire distribution area
• Standard protocol for monitoring
• Unknown staging/wintering sites (especially for the eastern populations)
• Standardized counting procedures for coordinated counts over the entire area to establish trends
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Spring staging areas
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• What characterizes a good spring staging area
• Pre-breeding staging sites: locations, requirements, threats and management with special emphasis to sites close to the actual breeding grounds
• Where are the main staging areas found for the different populations.
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Breeding areas
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Lack of detailled information about breeding distribution Lack of accurate information about population size in the breeding areas
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• Current distribution and size of the breeding populations in different areas
• Possible fabalis/rossicus hybridization zone in Nordkalotten (N/FI/SE/RU)
• Factors of importance for the selection of breeding habitats and for the selection of nest sites.
• Definition of the main breeding habitats in different regions.
• Possible factors affecting the availability of good breeding habitats.
• Densities of breeding populations in different regions/habitat types
• Competition from e.g. Whooper Swans in breeding areas
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• Studies on population dynamics
• Modern analysis of survival rates for different populations and cohorts within population
• Solid data on reproduction rates
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Moulting
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Where are the main moulting areas to be found??
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• Locate moulting sites
• Factors affecting the selection of moulting sites for Taiga Bean Geese.
• The connectivity between breeding and moulting areas
• Dynamics of site use by moulting geese.
• Moulting site bonding processes
• Predation on moulting sites
• Competition from other goose species on moulting sites (e.g. vegetation degradation)
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Migration
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• The connectivity between breeding and moulting areas
• Migration patterns for different populations (especially for the eastern populations and Karelia)
• The connectivity between breeding areas, staging areas and wintering areas.
• Marking programs to elucidate migration patterns of the birds from Karelia and the eastern area (GPS/GSM)
• Study the origin of geese in different wintering/staging areas with stable isotope techniques.
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Staging/wintering areas
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• Unknown staging/wintering sites
• Landscape-level approaches to roost-foraging area management
• Sub-population structure: movements, numbers and management
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Hunting
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• “True” bag-sizes – for the different management units and countries
• Injures caused by hunting and their population-level impact
• Disturbance from hunting
• Influence of spring hunting
• Which harvest levels are sustainable??
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