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37 results for “Wintering grounds”
Data from: Disentangling the effects of environmental conditions on wintering and breeding grounds on age-specific survival rates in a trans-Saharan migratory raptor
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Data from: Carry-over effects of conditions at the wintering grounds on breeding plumage signals in a migratory bird: roles of phenotypic plasticity and selection
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Data from: Identifying the African wintering grounds of hybrid flycatchers using a multi–isotope (δ2H, δ13C, δ15N) assignment approach
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Data from: Linking the wintering and breeding grounds of warblers along the Pacific Flyway
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Data from: Subarctic singers: Humpback whale (Megaptera novaeangliae) song structure and progression from an Icelandic feeding ground during winter
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Data from: Wintering grounds, population size and evolutionary history of a cryptic passerine species from isotopic and genetic data
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Data from: Genetic variation in blue whales in the eastern Pacific: implication for taxonomy and use of common wintering grounds
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Data from: Cyprus wheatears Oenanthe cypriaca likely reach sub-Saharan African wintering grounds in a single migratory flight
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Data from: February precipitation in the wintering grounds of the lesser whitethroat, Sylvia curruca: is it a cue for migration onset?
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Data from: A rare study from the wintering grounds provides insight into the costs of malaria infection for migratory birds
Malaria parasites can have strong effects on the population dynamics and evolution of migratory bird species. In many species, parasite transmission occurs on the wintering grounds, but studies to determine the consequences of infection have taken place during the breeding season, when malaria parasites circulate at chronic levels. We examined the predictors of malarial infections for great reed warblers during the northern winter in Africa, where active parasite transmission is thought to occur and naïve individuals experience acute infections. Counter to expectations, we found that winter infection intensities were lower than those encountered on the breeding grounds. One potential explanation is that reduced immune function during breeding allows parasites to persist at higher chronic intensities. We found no relationships between the incidence or intensity of infection on condition (as measured by scaled mass index, plasma metabolites, and feather corticosterone), spring migration departure dates, or home range sizes. We also tested a prediction of the Hamilton–Zuk hypothesis and found that male ornament (song) quality was unrelated to parasitic infection status. Overall, our results provide the first evidence that long-distance migrants captured on their wintering grounds are in the chronic stage of infection, and suggest that winter studies may fare no better than breeding studies at determining the costs of acute malarial infection for great reed warblers.
Effect of wind farms on wintering ducks at an important wintering ground in China along the East Asian-Australasian Flyway
<p>Wind farms offer a cleaner alternative to fossil fuels and can mitigate their negative effects on climate change. However, wind farms may have negative impacts on birds. The East China Coast forms a key part of the East Asian-Australasian Flyway and it is a crucial region for wind energy development in China. However, despite ducks being the dominant animal taxon along the East China Coast in winter and considered as particularly vulnerable to the effects of wind farms, the potential negative impacts of wind farms on duck populations remain unclear. We therefore assessed the effects of wind farms on duck abundance, distribution, and habitat use at Chongming Dongtan, which is a major wintering site for ducks along the East Asian-Australasian Flyway, using field surveys and satellite tracking. We conducted seven paired field surveys of ducks inside (IWF) and outside wind farm (OWF) sites in artificial brackish marsh, paddy fields, and aquaculture ponds. Duck abundance was significantly higher in OWF compared with IWF sites, and significantly higher in artificial brackish marsh than in aquaculture ponds and paddy fields. Based on 1,918 high-resolution satellite tracking records, the main habitat types of ducks during the day and at night were artificial brackish marsh and paddy fields, respectively. Furthermore, grid-based analysis showed overlaps between ducks and wind farms, with greater overlap at night than during the day. According to resource selection functions, habitat use by wintering ducks was impacted by distance to water, land cover, human activity, and wind-farm effects, and the variables predicted to have significant impacts on duck habitat use differed between day and night. Our study suggests that wintering ducks tend to avoid wind turbines at Chongming Dongtan, and landscape of paddy fields and artificial wetlands adjoining natural wetlands is crucial for wintering ducks</p>
Supplementary material for "Habitat preferences of the Ortolan bunting (Emberiza hortulana) in its prime wintering grounds, the cereal-dominated Ethiopian Highlands"
<p><strong>Abstract</strong></p> <p>Agricultural intensification and land-use changes are major factors impacting farmland biodiversity<strong>. </strong>The Ortolan Bunting <em>Emberiza hortulana</em> is the long-distance trans-Saharan migratory passerine that has undergone the most dramatic decline among all European farmland birds. Factors responsible for this decline may originate from the breeding grounds, migration stopovers and/or overwintering quarters. Very little is known about conditions on winter grounds, but a recent study has highlighted the utmost importance of the traditionally-managed agroecosystems in the Ethiopian Highlands as a key wintering area, apparently harbouring as much as 90% of the Ortolan Bunting’s world population. Using radiotracking and line transect surveys, this study aimed to provide fine-grained information about species-habitat relationships in the Ortolan Bunting’s overwintering quarters. Our results showed the importance, at the landscape scale, of small-scale agriculture, notably of traditionally-managed, cereal-dominated fields interspersed with semi-natural structures. At a foraging-site scale, on the other hand, patches of bare ground in combination with high amounts of post-harvesting stubble represented key habitat features. Stubbles provide an essential food resource, whereas bare ground promotes ground foraging by enhancing food accessibility. The maintenance of a traditional agricultural economy will be essential to maintain the habitat potential for the Ortolan Buntings overwintering in the Ethiopian Highlands, and will be instrumental in preserving its world population from further decline.</p>
Figure 2 from: Jaskula R, Soszyńska-Maj A (2011) What do we know about winter active ground beetles (Coleoptera, Carabidae) in Central and Northern Europe? ZooKeys 100: 517-532. https://doi.org/10.3897/zookeys.100.1543
Figure 2 - The relative zoogeographical structure of winter active Carabidae (based on Leśniak 1988).
Figure 1 from: Jaskula R, Soszyńska-Maj A (2011) What do we know about winter active ground beetles (Coleoptera, Carabidae) in Central and Northern Europe? ZooKeys 100: 517-532. https://doi.org/10.3897/zookeys.100.1543
Figure 1 - Comparision of subnivean, supranivean and tree trunk fauna of Carabidae from Central and Northern Europe during the winter season (based on different sources).
Data from: Why do migratory birds sing on their tropical wintering grounds?
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Data from: A rare study from the wintering grounds provides insight into the costs of malaria infection for migratory birds
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Effect of wind farms on wintering ducks at an important wintering ground in China along the East Asian-Australasian Flyway
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OpenNeuro
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