| 1. |
- Díez-del-Molino, David, et al.
(author)
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Population genomics reveals lack of greater white-fronted introgression into the Swedish lesser white-fronted goose
- 2020
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In: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 10:1
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Journal article (peer-reviewed)abstract
- Interspecific introgression is considered a potential threat to endangered taxa. One example where this has had a major impact on conservation policy is the lesser white-fronted goose (LWfG). After a dramatic decline in Sweden, captive breeding birds were released between 1981–1999 with the aim to reinforce the population. However, the detection of greater white-fronted goose (GWfG) mitochondrial DNA in the LWfG breeding stock led to the release program being dismantled, even though the presence of GWfG introgression in the actual wild Swedish LWfG population was never documented. To examine this, we sequenced the complete genomes of 21 LWfG birds from the Swedish, Russian and Norwegian populations, and compared these with genomes from other goose species, including the GWfG. We found no evidence of interspecific introgression into the wild Swedish LWfG population in either nuclear genomic or mitochondrial data. Moreover, Swedish LWfG birds are genetically distinct from the Russian and Norwegian populations and display comparatively low genomic diversity and high levels of inbreeding. Our findings highlight the utility of genomic approaches in providing scientific evidence that can help improve conservation management as well as policies for breeding and reinforcement programmes.
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| 2. |
- Elmberg, Johan, et al.
(author)
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Gäss : ny kunskap krävs
- 2017
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In: Vår fågelvärld. - 0042-2649. ; :4
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Journal article (other academic/artistic)abstract
- "Dum som en gås" är ett märkligt talesätt. Gäss är tvärtom vaksamma, sociala och förnämligt anpassade till sin miljö. De hittar och väljer den föda som bäst svarar mot årstidens behov, och de fattar strategiska beslut inför flyttning och häckning. Att de också är framgångsrika visar den sentida starka ökningen av flera arter.
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| 3. |
- Elmberg, Johan, et al.
(author)
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Jagar du lokala grågäss eller flyttande fågel?
- 2023
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In: Svensk jakt: Svenska jägareförbundets tidskrift. - 0039-6583. ; :9, s. 36-38
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Journal article (other academic/artistic)abstract
- De svenska grågässen är fler än någonsin. Färsk forskning visar att de också har nya vanor. Fem forskare från Sveriges lantbruksuniversitet och Högskolan Kristianstad skriver om grågåsen och hur arten kan förvaltas tillsammans med andra länder.
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| 4. |
- Elmberg, Johan, et al.
(author)
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Vilka grågäss jagar du egentligen?
- 2023
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In: Svensk jakt: Svenska jägareförbundets tidskrift. - 0039-6583. ; 161:9, s. 36-38
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Journal article (other academic/artistic)
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| 5. |
- Eriksson, Louise, 1973-, et al.
(author)
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The importance of structural, situational, and psychological factors for involving hunters in the adaptive flyway management of geese
- 2023
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In: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 13:1
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Journal article (peer-reviewed)abstract
- Adaptive flyway management of superabundant geese is emerging as a strategy to reduce damage to agricultural crops and other ecosystem disservices, while also ensuring sustainable use and conservation objectives. Given the calls for intensified hunting as part of flyway management in Europe, we need to increase the understanding of structural, situational, and psychological factors important for goose hunting among hunters. Our survey data, retrieved in southern Sweden, showed a higher potential to intensify hunting among goose hunters than other hunters. In response to hypothetical policy instruments (including regulations, collaborative, and others), hunters declared a minor increase in their intention to hunt geese, with the greatest expected increase among goose hunters should the hunting season be extended. Situational factors (e.g., access to hunting grounds) were associated with goose hunting (frequency, bag size, and intention to increase hunting). In addition, controlled motivation (derived from external pressures or to avoid guilt) and more importantly autonomous motivation (due to hunting being enjoyable or valuable) were along with goose hunter identity positively associated with goose hunting. Hunters’ involvement in flyway management may be encouraged by using policy instruments to remove situational barriers and facilitate their autonomous motivation.
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| 6. |
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| 7. |
- Liljebäck, Niklas, et al.
(author)
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Learning from long time series of harvest and population data : Swedish lessons for European goose management
- 2021
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In: Wildlife Biology. - : Wiley. - 0909-6396 .- 1903-220X. ; 2021:1
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Research review (peer-reviewed)abstract
- Goose management in Europe is faced by multiple challenges, as some species are declining and in need of conservation actions, while other populations have become very abundant, resulting in calls for increased harvest. Sweden has long-Term series of harvest data and counts of breeding and autumn-staging geese. We used national data (indices) for greylag goose, bean goose and Canada goose to study shifts in temporal trends and correlative patterns, and to infer possible causal links between harvest and population trends. Our study provides an opportunity to guide management given the data collected within the present monitoring, as well as to suggest improvements for future data collection. The populations of greylag and Canada geese increased in Sweden 1979-2018, but this long-Term trend included a recent decrease in the latter species. Bean goose breeding index decreased, whilst staging numbers and harvest varied with no clear long-Term trend. For Canada goose, our analysis suggests that harvest may affect population growth negatively. For bean goose and greylag goose we could not detect any effect of harvest on autumn counts the following year. We find that the present data and analysis of coherence may suffice as basis for decisions for the current management situation in Sweden with its rather unspecific goals for greylag (very abundant) and Canada goose (invasive species) populations. However, for management of bean geese, with international concerns of over harvest, data lack crucial information. For future management challenges, with more explicit goals, for all goose species we advocate information that is more precise. Data such as hunting effort, age-structure of goose populations and mark-recapture data to estimate survival and population size, is needed to feed predictive population models guiding future Swedish and European goose management.
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| 8. |
- Liljebäck, Niklas
(author)
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Migration routes and stepping stones along the western flyway of Lesser White-fronted Geese (Anser erythropus)
- 2023
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In: Bird Conservation International. - 0959-2709 .- 1474-0001. ; 33
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Journal article (peer-reviewed)abstract
- In 2015 and 2016 four Lesser White-fronted Geese (Anser erythropus), a globally threatened species, were caught and tagged during spring migration representing nearly 10% of the entire Swedish breeding population at the time. Two of the birds were followed over more than one season. Tracking data revealed an unexpected wide network of migration corridors and staging sites. Autumn and spring migration differed by stepping-stone sites and migration speed. So far unknown key stopover sites were discovered in Denmark, northern Germany, and Sweden. By using dynamic Brownian bridge movement models, the potential areas that Lesser White-fronted Geese used during migration are described and conservation implications spotlighted. This study provides another important piece of the puzzle describing the migration of Lesser White-fronted Geese in Western Europe.
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| 9. |
- Liljebäck, Niklas, et al.
(author)
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Prevalence of imbedded and ingested shot gun pellets in breeding sea ducks in the Baltic Sea—possible implications for future conservation efforts
- 2023
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In: European Journal of Wildlife Research. - 1612-4642. ; 69:4
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Journal article (peer-reviewed)abstract
- Several sea duck species in Europe face dwindling population numbers with following increased conservation focus. Shot gun practices may put extra pressure on populations not only by direct hunting mortality but also crippling and lead poisoning from ingestion of pellets. In this study, we examined three sea duck species breeding in the Swedish Archipelago of the Baltic Sea by x-raying trapped incubating females to detect prevalence of imbedded and ingested shot gun pellets. The study was carried out during the 2021 and 2022 breeding seasons and designed to aid our understanding of the role of physical restraints of putative pellets to breeding performance at our study site. A total of 205 individual females of common eider (n = 113), velvet scoter (n = 57), and red-breasted merganser (n = 35) were x-rayed without finding any imbedded or ingested pellets. For this study, a combination of decreasing hunting pressure, remoteness of study site, improved hunters’ shooting performance along the flyway and depletion of crippling rates due to life-long negative effects of carrying imbedded pellets may explain our finding on non-detection. For common eider, specific interventions to reduce the negative impacts of shotgun practices have been reported successful, and our data suggest a continuing positive trend. Based on our findings, we advise future conservation efforts for the three species, breeding in this part of the flyway, to focus on other factors that may have negative impact on incubating female survival and reproduction.
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| 10. |
- Liljebäck, Niklas, et al.
(author)
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Use of foster parents in species conservation may cause conflicting objectives: Hybridization between Lesser White-fronted Goose Anser erythropus and Barnacle Goose Branta leucopsis
- 2021
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In: Ornis Svecica. - 1102-6812. ; 31, s. 125-138
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Journal article (peer-reviewed)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.
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