Literature type: Report
Language: Swedish In Swedish with English summary.
Download:Full reference: Willebrand, T. & Willebrand, S. 2018. Utvärdering av Åtgärdsprogrammet för fjällgås 2011–2017. [Evaluation of the 2011–2017 Action Program for the Lesser White-fronted Goose (Anser erythropus).] , Naturvårdsverket Rapport 6836. 26. pp
Keywords: captive breeding, reintroduction, red fox culling, monitoring, Sweden
Abstract:
This report is an external evaluation of the current Swedish Action Plan for the Lesser White-Fronted Goose (2011-2015, extended until 2017) and parts of the Lesser White-Fronted Goose Project, commissioned by the Swedish Environmental Protection Agency (SEPA). The evaluation has come to the following conclusions: 1. The Lesser White-fronted Goose in Sweden is critically endangered and immigration from other populations, like the small Norwegian population, is not very probable. To secure the species from becoming extinct in in Sweden, larger resources are required than what is currently available in the system for action plans at SEPA. 2. An increased focus on breeding areas is recommended to obtain more data on predator activity, human disturbance and recruitment of released birds from the breeding program. 3. An increased control of the red fox (Vulpes vulpes) population in the breeding area during late winter, and an evaluation of the optimal ratio of released to wild birds in the population, are two highly prioritized actions. 4. Establishing a systematic monitoring program including quality control will make estimates on population development more reliable. 5. Potential breeding areas, with special emphasize on the extent of grazing fields, should be surveyed in the proximity of the present breeding area to estimate the possibility of natural expansion into new areas. 6. The captive breeding and release is well organized and of high quality. (However, as stressed above, an estimate of the optimal numbers of released birds into the wild should be evaluated.)
Literature type: Report
Language:
English
Full reference: Lee, R., Cranswick, P.A. Hilton, G.M. & Jarrett, N.S. 2010. Feasibility study for a re-introduction/supplementation programme for the Lesser White-fronted Goose Anser erythropus in Norway. , WWT Report to the Directorate for Nature Management, Norway. 130pp.
Keywords: reintroduction, translocation, population, mortality, feasibility, re-introduction, supplementation, Norway, Fennoscandia, life-history, captive breeding, zoo,
Literature type: Scientific
Journal: Conservation Genetics
Volume: 1 , Pages: 277-283.
Language:
English
Full reference: Ruokonen, M., Kvist, L., Tegelström, H., Lumme, J. 2000. Goose hybrids, captive breeding and restocking of the Fennoscandian populations of the Lesser White-fronted goose (Anser erythropus). Conservation Genetics 1: 277-283. https://www.dx.doi.org/10.1023/A:1011509922762
Keywords: captive stock, hybrids, mitochondrial DNA, reintroduction
Abstract:
The lesser white-fronted goose (Anser erythropus) is the most threatened of the Palearctic goose species with a declining population trend throughout its distributional range. The current estimate of the Fennoscandian subpopulation size is 30–50 breeding pairs, whereas it still numbered more than 10 000 individuals at the beginning of the last century. Reintroduction and restocking have been carried out in Sweden and Finland using captive lesser white-fronted goose stock with unknown origins. We have carried out a study of the genetic composition of captive-bred stock by sequencing a 221 bp hypervariable fragment of the mitochondrial DNA (mtDNA) control region from 15 individuals from the Hailuoto farm, Finland. Two out of the three maternal lineages detected in the captive stock are also present in wild populations. The third maternal lineage among the captive lesser white-fronted geese originates from the closely related greater white-fronted goose (Anser albifrons). None of the investigated wild lesser white-fronted goose individuals carried themtDNA of the greater white-fronted goose. The presence of greater white-fronted goose mtDNA in the lesser white-fronted goose captive stock suggests that hybridization has occurred during captive propagation.
Literature type: Scientific
Journal: Biochem. Genet.
Volume: 34 , Pages: 287-296.
DOI: 10.1007/PL00020578
Language:
English
External Link:
Full reference: Tegelström, H. & von Essen, L. 1996. DNA fingerprinting of captive breeding pairs of lesser white-fronted geese (Anser erythropus) with unknown pedigrees. Biochem. Genet. 34: 287-296. https://www.dx.doi.org/10.1007/PL00020578
Keywords: genetics, reintroduction
Abstract:
For a number of decades, the lesser white-fronted goose (Anser erythropus) has been almost-absent from the Fennoscandian fauna and has a current population size of only about 60 breeding pairs, with fewer than 10 pairs in Sweden. During the period 1981–1991 more than 200 young have been reintroduced in northern Sweden. However, the origin and possible relatedness of lesser white-fronted individuals were unknown when the breeding program started. We have used DNA fingerprinting to assess the similarity of 18 individuals, i.e., the entire captive population used for breeding in 1991 and about 60% of the captive population used in 1981–1991. Minisatellite probe 33.15 provided an index for an average similarity of 0.39 between the mates of the 12 breeding pairs used for producing offspring for reintroduction. This is a higher similarity than in natural populations of birds in general but lower than in populations that have passed through serious population bottlenecks. Individuals originating from different breeders are more dissimilar than those from the same breeder. However, the close relationships (similarity, 0.5–0.6) found in a group of five individuals from different breeders show that selecting individuals from different breeding groups is not sufficient to prevent mating between closely related individuals.
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