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14 results for “ground-nesting birds”
Habitat geometry rather than visual acuity limits the visibility of a ground-nesting bird's clutch to terrestrial predators
<p><span>The nests of ground-nesting birds rely heavily on camouflage for their survival, and predation risk, often linked to ecological changes from human activity, is a major source of mortality. </span>Numerous ground-nesting bird populations are in decline, so understanding the effects of camouflage on their nesting behaviour is of relevance to their conservation concern. Habitat three-dimensional (3D) geometry together with predator visual abilities, viewing distance, and viewing angle determine whether a nest is either visible, occluded or too far away to detect. While this link is intuitive, few studies have investigated how fine-scale geometry is likely to help defend nests from different predator guilds. We quantified nest visibility based on 3D occlusion, camouflage, and predator visual modelling in northern lapwing, <em>Vanellus vanellus</em>, on different land management regimes. <span>Lapwings selected local backgrounds that had a higher 3D complexity at a spatial scale greater than their entire clutches compared to local control sites. Importantly, our findings show that habitat geometry – rather than predator visual acuity – restricts nest visibility to terrestrial predators, and that their field habitats perceived by humans as open are functionally closed with respect to a terrestrial predator searching for nests on the ground. </span>Taken together with lapwings' careful nest site selection, our findings highlight the importance of considering habitat geometry for understanding the evolutionary ecology and management of conservation sites for ground-nesting birds.</p>
Habitat geometry rather than visual acuity limits the visibility of a ground-nesting bird's clutch to terrestrial predators
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The decline of ground-nesting birds in Europe: do we need to manage predation in addition to habitat?
<p>Bird populations are declining globally with losses recorded in many European breeding birds. Habitat management measures have not resulted in a widespread reversal of these declines. We analysed national bird population trends from ten European countries (France, Hungary, Ireland, the Netherlands, Poland, Portugal, Spain, Sweden, Switzerland, and the UK) in relation to the species' nesting strategy ('ground-nesting' or 'other'), Annex I designation ('designated' or 'not designated') and association with agricultural habitats for breeding ('associated' or 'not associated'). For each country in our dataset, we also defined the following factors: farming intensity; predator community complexity; and predator control effort. Our results showed additive effects of nesting strategy, designation, and breeding habitats on the likelihood of population decline. Ground-nesting birds were 86% more likely to decline than birds with other nesting strategies. Annex I designated species of the Birds Directive were 50% less likely to decline than non-designated birds. Birds breeding primarily in agricultural habitats were more likely to decline than birds breeding in other habitats, interactively with farming intensity. Homogenous trends across Europe (i.e., trends in two or more countries that were either not declining in all countries or declining in all countries) indicate that the probability of population decline was related to nesting strategy and breeding habitat, with ground-nesting birds being 15.6 times more likely than other birds to have a declining trend across Europe, and birds nesting in agricultural habitat being 17.8 times more likely than birds nesting in other habitats to have a declining trend across Europe. Our results highlight a widespread challenge, therefore widespread instruments (e.g. legislation, economic policies, agri-environment schemes) will be required to reserve these declines. Ground-nesting species requirements can be complex and multiple strategies will be needed to restore populations including the development of predation management tools.</p>
Subarctic afforestation: effects of forest plantations on ground-nesting birds in lowland Iceland
<p>Planting forests is a commonly suggested measure to mitigate climate change. The resulting changes in habitat structure can greatly influence the diversity and abundance of pre-existing wildlife. Understanding these consequences is key for avoiding unintended impacts of afforestation on habitats and populations of conservation concern. Afforestation in lowland Iceland has been gaining momentum in recent years and further increases are planned. Iceland supports internationally important breeding populations of several ground-nesting, migratory bird species that mostly breed in open habitats. If afforestation impacts the distribution and abundance of these species, the consequences may be apparent throughout their non-breeding ranges across Europe and Africa. To quantify the effects of plantation forests on the abundance and distribution of ground-nesting birds (in particular waders, Charadriiformes), surveys were conducted on 161 transects (surrounding 118 plantations) perpendicular to forest edges throughout Iceland. The resulting variation in density with distance from plantation was used to estimate the likely changes in bird numbers resulting from future afforestation plans, and to explore the potential effects of different planting configuration (size and number of forest patches) scenarios. Of seven wader species, densities of five (golden plover (Pluvialis apricaria), whimbrel (Numenius phaeopus), oystercatcher (Haematopus ostralegus), dunlin (Calidris alpina) and black-tailed godwit (Limosa limosa)) in the 200 m surrounding plantations were just over half of those further away (up to 700 m). Redshank (Tringa totanus) densities were lowest <150 m from the plantation edge while snipe (Gallinago gallinago) densities were 50% higher close to plantations (0-50 m) than further away (51-700 m), and no consistent effects of plantation height, diameter, density or type were identified. Plantations are typically small and widespread, and simulated scenarios indicated that total declines in bird abundance resulting from planting trees in one large block (1000 ha) could result in only ~11% of the declines predicted from planting multiple small blocks (1 ha) in similar habitats. Synthesis and application: The severe impact that planting forests in open landscapes can have on populations of ground-nesting birds emphasises the need for strategic planning of tree-planting schemes. Given Iceland's statutory commitments to species protection and the huge contribution of Iceland to global migratory bird flyways, these are challenges that must be addressed quickly, before population-level impacts are observed across migratory ranges.</p>
Subarctic afforestation: effects of forest plantations on ground-nesting birds in lowland Iceland
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Data for: Effect of low-traffic roads on abundance of ground-nesting birds in sub-Arctic habitats
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Data from: Reproductive plasticity and landscape heterogeneity benefit a ground-nesting bird in a fire-prone ecosystem
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The decline of ground-nesting birds in Europe: do we need to manage predation in addition to habitat?
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Data from: Habitat structure and an introduced predator limit the abundance of an endangered ground-nesting bird
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Data from: Deceiving predators: linking distraction behavior with nest survival in a ground-nesting bird
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Data from: Cover, not caging, influences chronic physiological stress in a ground-nesting bird
Predator exclosures ('nest cages') around nests are increasingly used to enhance hatching success of declining ground-nesting birds. However, such exclosures are contentious and have been suggested to have detrimental effects on the species which they aim to protect. This study examines whether exclosures increase physiological stress of incubating birds, a hitherto unrecognised and untested potential drawback of exclosures. Red-capped plover Charadrius ruficapillus hatching success was radically altered and significantly higher for nests with exclosures (96.2%) compared with those without (6.8%). Chronic physiological stress in parents (as measured by the heterophil/lymphocyte [H/L] ratio in blood) did not vary between nests with and without exclosures, or between the sexes. However the absence of vegetative cover at the nest site was associated with a 62.7% elevation in H/L ratio, indicating that incubating birds which place their nests in the open are subject to increased levels of chronic stress. The results from this study demonstrate the fundamental importance of predation for the nesting success of this species and confirm that chronic stress levels are not a detrimental side effect of exclosure use.
Data from: Cover, not caging, influences chronic physiological stress in a ground-nesting bird
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Data from: A ground-nesting Galliform’s response to thermal heterogeneity: Implications for ground-dwelling birds
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Data from: Escape distance in ground-nesting birds differs with individual level of camouflage
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International Brain Laboratory public data
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OpenNeuro
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