Literature type: Scientific
Journal: Ornis svecica
Volume: 31 , Pages: 125–138
Language:
English
Full reference: Liljebäck, N., Koffijberg, K., Kowallik, C., Månsson, J. & Andersson, Å. 2021. Use of foster parents in species conservation may cause conflicting objectives: Hybridization between Lesser White-fronted Goose Anser erythropus and Barnacle Goose Branta leucopsis. Ornis svecica 31: 125–138 https://www.dx.doi.org/10.34080/OS.V31.22430
Keywords: reintroduction, foster parents, Sweden, hybridization
Abstract:
Following the use of Barnacle Geese Branta leucopsis as foster parents in a conservation program for the endangered Lesser White-fronted Goose Anser erythropus in Sweden 1981–1999, mixed breeding pairs of the two species were established in the wild. We find indications that this was related to shared moulting habits of the two species in the Bothnian Sea during late 1990s. Starting in 2003, five mixed pairs produced at least 49 free-flying hybrid offspring until 2013, when the last breeding was confirmed. Reported numbers of hybrids did not increase in parallel to the production of young hybrids over time. After 2013, the number of hybrids started to decrease in Sweden and the Netherlands. Lower numbers of hybrids than expected can partly be explained by management actions taken, but may also be associated with low survival due to genetic outbreeding. Mixed pairs and their offspring entirely adopted the migratory habits of Barnacle Geese, overlapping very little with sites used by Lesser White-fronted Geese. We find no evidence that the hybrids ever posed a serious threat to Lesser White-fronted Geese breeding in Fennoscandia.
Literature type: Scientific
Journal: Wildfowl
Volume: 68 , Pages: 44-69.
Language:
English
Full reference: Cuthbert, R.J., Aarvak, T., Boros, E., Eskelin, T., Fedorenko, V., Karvonen, R., Kovalenko, A., Lehikoinen, S., Petkov, N., Szilágy, A., Tar, J., Timonen, S., Timoshenko, A., Zhadan, K. & Zuban, I. 2018. Estimating the autumn staging abundance of migratory goose species in northern Kazakhstan. Wildfowl 68: 44-69.
Keywords: Anser erythropus, Branta ruficollis, flyway population estimates, sampling methodology.
Abstract:
Northern Kazakhstan and adjoining areas of Russia have vitally important autumn staging sites for arctic breeding geese, especially for the globally threatened Lesser White-fronted Goose Anser erythropus (LWfG) and Red-breasted Goose Branta ruficollis (RbG). Part of the Fennoscandian and the entire Western Main subpopulations of LWfG and the global population of RbGs are believed to stage there, which facilitates obtaining up-to-date population estimates for these species. A total of 80 lakes were surveyed across four survey areas in autumn 2016, recording more than 1.2 million geese in the region. Greater White-fronted Geese Anser albifrons (GWfG) were the most abundant with an estimated c. 890,000 birds, with counts of c. 250,000 Greylag Geese Anser anser, c. 53,000 Ruddy Shelduck Tadorna ferruginea, c. 39,100 RbG and c. 32,000 LWfG also recorded during the surveys. Based on a priori lake classification for both LWfG and RbG, to stratify survey lakes in order to generate total population estimates, survey teams visited a sample of different lake types. After removing lakes smaller than the observed minimum lake size used by each species, the total number of potential lakes available within the core staging areas of each species (335 lakes of > 320 ha for LWfG; 361 lakes of > 100 ha for RbG) was calculated. Bootstrapping procedures, with replacement, were then used to estimate the total numbers likely to be present in the region. These calculations produced total estimates of 34,250 birds (95% confidence intervals = 28,500–40,100 birds) for the Western Main population of LWfG (well in excess of current population estimates of 8,000–13,000 individuals) and an estimated population of 50,100 RbG (95% CI = 28,100–72,600 birds), broadly similar to recent population estimates of 55,000–57,000. We recommend that future surveys continue to monitor as large a region and as many lakes as possible in order to capture inter-annual variation in the distribution of birds and to provide more reliable assessments of population size and trends of these migratory species.
Literature type: General
Journal: Branta
Volume: 2 , Pages: 15.
Language:
Bulgarian
(In French)
Full reference: Simeonov, P.,Zehtindjiev, P. & Dilchev, N. 1998. Recensement hivernal d'oiseaux d'eau en Dobrudja Bulgare (janvier 1997). [Winter count of waterfowl birds in Dobrugea, Bulgaria (January 1997)..], Branta: 2, 15.
Keywords: Bulgaria
Literature type: Scientific
Journal: International Journal of Osteoarchaeology
Volume: 8 , Pages: 280-287.
DOI: 10.1002/(SICI)1099-1212(199807/08)8:4<280::AID-OA428>3.0.CO;2-J
Language:
English
Full reference: Barnes, I., Dobney, K.M. & Young, P.W. 1998. The Molecular Palaeoecology of Geese: Identification of Archaeological Goose Remains using Ancient DNA Analysis. International Journal of Osteoarchaeology 8: 280-287. https://www.dx.doi.org/10.1002/(SICI)1099-1212(199807/08)8:4<280::AID-OA428>3.0.CO;2-J
Keywords: ancient DNA, anser, Branta, geese, mitochondrial DNA, polymerase chain reaction
Abstract:
The remains of six species of geese are commonly recovered from archaeological sites in Britain dating from the Saxon and later periods. However, identification of this material to species level is hampered by a lack of morphological variation and a large overlap in size. To address this issue we obtained DNA sequence data for a section of the mitochondrial cytochrome b gene from modern samples of each species, and successfully identified several DNA markers for Branta species. No markers were found within the cytochrome b gene for the genus Anser. Ancient DNA techniques were then used to recover DNA from goose bones excavated from two archaeological sites. The DNA sequences enabled identification of Barnacle goose (Branta leucopsis) from one site and confirmed the presence of Anser species at another.
Literature type: General
Journal: Branta
Volume: 3 , Pages: 24-25.
Language:
Bulgarian
(In French)
Full reference: Anonymous 1998. Quand les shasseurs de "l'Uest" ravagent les sites protégés de "l'Est". [When hunters of the West devastate protected areas of the East.], Branta: 3, 24-25.
Keywords: Bulgaria
Literature type: Scientific
Journal: Biochemical Genetics
Volume: 33 , Pages: 123-135.
DOI: 10.1007/BF00557950
Language:
English
Full reference: Kuznetsov, S.B. 1995. Polymorphism of blood plasma proteins in the Anser and Branta genera. Biochemical Genetics 33: 123-135. https://www.dx.doi.org/10.1007/BF00557950
Keywords: genetics
Abstract:
An electrophoretical analysis of blood plasma proteins of eightAnser and twoBranta species was performed. Ten polymorphic proteins in blood plasma pattern were distinguished and described: four prealbumin proteins, albumin, three postalbumin proteins, transferrin, and a single posttransferrin protein. Genus-specific and species-specific variants of Pr-1, Al, Pa-3, Pa-X, and Tf proteins were found. The species ofBranta differed inPr-1,Pa-3,Pa-X, andTf loci. TheAnser species differed, apparently, in allele frequencies of described gene loci. A single species-specific protein marker was found in swan geese only. The electrophoretic mobilities of Pr-1, TfB, and PtfA, B, and C were similar for several species ofAnser andBranta genera.
Number of results: 6