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25 results for “woodland birds”
Comparative Bird Community Assessments in Grassland, Shrubland, and Woodland Habitats at the Sevilleta National Wildlife Refuge, New Mexico (1991-1997 and 2022-2023)
Across North America, avifauna abundance has declined by 30% since 1970 (Rosenberg, K.V. et al. 2019). Direct mortality from anthropogenic sources (pets, cars, collisions with building, power lines, wind turbines, etc.) and indirect mortality (habitat loss, disturbance, climate change, etc.) have both been major contributors to these declines (Loss, S.R. et al. 2015 and Calvert, A.M. et al. 2013). Variables such as migration patterns, family, breeding and non-breeding biomes show differing rates of decline (Rosenberg, K.V. et al. 2019). In New Mexico, there are three breeding biomes all classified with declining avian abundance. Avian abundance in grasslands has declined by 53.3% since 1970, western forests by 29.5% and arid lands by 17.0% (Rosenberg, K.V. et al. 2019). All three of these biomes also occur at the Sevilleta National Wildlife Refuge thus temporal declines in species richness and abundance are expected. This project was originally designed to sample the species richness and abundance of birds on the Sevilleta National Wildlife Refuge in three types of habitat: grassland, creosote shrubland and pinyon-juniper woodland. Surveys were conducted between January 1991 and May 1997 (Parmenter, R. 2016). Surveys were re-established in 2022 to document current species richness and abundance and to capture any temporal changes from the 90s data. Avian point count survey stations in grassland, creosote and pinyon-juniper habitats run through existing study sites which have all been subjected to intense research activity. Literature Cited A. M. Calvert, C. A. Bishop, R. D. Elliot, E. A. Krebs, T. M. Kydd, C. S. Machtans, G. J. Robertson, A synthesis of human-related avian mortality in Canada. Avian Conserv. Ecol. 8, art11 (2013). https://www.ace-eco.org/vol8/iss2/art11/ Loss, S. R., Will, T., Marra, P. P. 2015. Direct Mortality of Birds from Anthropogenic causes. Annu. Rev. Ecol. Evol. Syst. 46, 99–120. https://www.annualreviews.org/doi/10.1146/annurev-ecolsys-1124
Multi‐marker DNA metabarcoding reveals spatial and sexual variation in the diet of a scarce woodland bird
<p>Avian diet can be affected by site‐specific variables, such as habitat, as well as intrinsic factors such as sex. This can lead to dietary niche separation, which reduces competition between individuals, as well as impacting how well avian species can adapt to environmental variation. Estimating dietary niche separation is challenging, due largely to difficulties in accurately identifying food taxa consumed. Consequently, there is limited knowledge of the diets of woodland bird species, many of which are undergoing serious population declines. Here, we show the effectiveness of multi‐marker fecal metabarcoding to provide in‐depth dietary analysis of a declining passerine in the UK, the Hawfinch (Coccothraustes coccothraustes). We collected fecal samples from (n = 262) UK Hawfinches prior to, and during, the breeding seasons in 2016–2019. We detected 49 and 90 plant and invertebrate taxa, respectively. We found Hawfinch diet varied spatially, as well as between sexes, indicating broad dietary plasticity and the ability of Hawfinches to utilize multiple resources within their foraging environments.</p>
Multi‐marker DNA metabarcoding reveals spatial and sexual variation in the diet of a scarce woodland bird
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Fig. 1 in Effect Of Farming And Rainfall On The Species Diversity, Population Density And Community Structure Of Birds Breeding In The Kalahari Woodland, Ne Namibia
Fig. 1. The location of the transect (indicated with red arrow).
Fig. 2 in Effect Of Farming And Rainfall On The Species Diversity, Population Density And Community Structure Of Birds Breeding In The Kalahari Woodland, Ne Namibia
Fig. 2. Monthly rainfall in Katima Mulilo in 2014 and 2015.
Fig. 4 in Effect Of Farming And Rainfall On The Species Diversity, Population Density And Community Structure Of Birds Breeding In The Kalahari Woodland, Ne Namibia
Fig. 4. Percentage of main nesting guilds in 2014 and 2015.
Mistletoes could moderate drought impacts on woodland birds, but are themselves susceptible to drought-induced dieback
<p>Mistletoes are hemiparasitic plants and keystone species in many ecosystems globally. Given predicted increases in drought frequency and intensity, mistletoes may be crucial for moderating drought impacts on community structure. Dependent on host vascular flows, mistletoes can succumb to stress when water availability falls, making them susceptible to mortality during drought. We counted mistletoe across >350,000 km<sup>2</sup> of south-eastern Australia and conducted standardised bird surveys between 2016 and 2021, spanning a major drought event in 2018-19. We aimed to identify predictors of mistletoe abundance and mortality and determine whether mistletoes might moderate drought impacts on woodland birds. Live mistletoe abundance varied with tree species composition, land use and presence of mistletoebirds. Mistletoe mortality was widespread, consistent with high 2018/19 summer temperatures, low 2019/20 summer rainfall and the interaction between summer temperatures and rainfall in 2019/20. The positive association between surviving mistletoes and woodland birds was greatest in the peak drought breeding seasons of 2018/19 and 2019/20, particularly for small residents and insectivores. Paradoxically, mistletoes could moderate drought impacts on birds, but are themselves vulnerable to drought-induced mortality. An improved understanding of the drivers and dynamics of mistletoe mortality is needed to address potential cascading trophic impacts associated with mistletoe die-off.</p>
Data for: Context dependency in interference competition among birds in an endangered woodland ecosystem
<p><strong>Aim</strong></p> <p>Much research has quantified species responses to human-modified ecosystems. However, there has been relatively limited work on how human-modified ecosystems may reshape competitive interactions between species. Using extensive data gathered over 19 years across an area exceeding three million ha, we asked: <em>Are levels of interference competition between bird species context-dependent and influenced by habitat structure and productivity</em>? We focussed on the hyper-aggressive behaviour of the Noisy Miner, which has been recognised as a Key Threatening Process for other woodland bird species.</p> <p><strong>Location</strong></p> <p>Temperate woodlands of south-eastern Australia</p> <p><strong>Methods </strong></p> <p>We constructed Bayesian multi-species occupancy/detection models of bird species in woodland patches and tested the fixed and interactive effects of Noisy Miner presence, the amount of tree cover, net primary productivity, and time. We quantified the responses of 31 species, many with known interactions with the Noisy Miner documented in previous studies at fine spatial scales. However, whether environmental conditions such as amount of forest cover and net primary productivity mediate the impact of Noisy Miners remains untested at large spatial scales and over decadal time scales.</p> <p><strong>Results</strong></p> <p>We identified negative associations between the Noisy Miner and 18 bird species, including, unexpectedly, both small- and large-bodied taxa. Site occupancy in some species was influenced by interactions between Noisy Miner presence and increasing amounts of tree cover or productivity. Our results suggest that for some species, interference competition by the Noisy Miner is context-dependent and mitigated by increasing tree cover and/or increasing net primary productivity</p> <p><strong>Main</strong> <strong>conclusions</strong></p> <p>Areas of high productivity or tree cover may be important refugia for some species of woodland birds. Vegetation clearing that reduces tree cover could likely strengthen interference competition by the Noisy Miner on parts of the remaining woodland bird community, including species of conservation concern.</p>
Mistletoes could moderate drought impacts on woodland birds, but are themselves susceptible to drought-induced dieback
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Data for: Context dependency in interference competition among birds in an endangered woodland ecosystem
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Data from: Optimising monitoring for trend detection after 16 years of woodland-bird surveys
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Changing food availability and its effect on the heritability of offspring size in woodland passerine birds
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Bird Community Assessment in Grassland, Shrubland, and Woodland Habitats at the Sevilleta National Wildlife Refuge, New Mexico (1991-1997)
This project was designed to sample the richness and abundance of birds on the Sevilleta National Wildlife Refuge. Three types of habitat were surveyed: grassland, creosote shrubland and pinyon-juniper woodland.
Long-term monitoring in endangered woodlands shows effects of multi-scale drivers on bird occupancy
<p>Occupancy predictor data, detection predictor data, and species detections from sites in remnant Box Gum Grassy Woodland patches in south-eastern Australia. Only sites, species, and predictors used in our statistical analysises included. For privacy, predictors have been standardised (mean = 0, standard deviation = 1) and latitude and longitude have been offset by random vectors.</p>
Data on bird abundance in urban woodlands in 32 Swedish cities
<p>The expansion of urban areas is increasingly contributing to biodiversity declines. Several studies have analyzed the effect of increasing urbanization on bird diversity, but few have differentiated effects of urban landscapes (matrix) from changes in focal habitat quality at multiple spatial scales. In this study we analyzed the effect of urbanization on bird communities in individual (local scale) and across multiple (regional scale) cities while controlling for the quality of sampled natural habitats. We conducted bird point counts and habitat quality mapping of trees, dead wood and shrubs in 459 forest remnants along an urbanization gradient in 32 cities in Sweden. We then analyzed how the degree of urbanization affected species richness of woodland-breeding bird and red-listed bird species at a regional and local scale. We also analyzed how urbanization affected beta-diversity and dissimilarity between communities at the different spatial scales, and if dissimilarities in species communities along the urbanization gradient were driven by species nestedness or turnover. We found that urbanization decreased species richness, and the number of red-listed species, at both the regional and local scale. Dissimilarities in woodland-breeding bird communities among urban, semi-urban and peri-urban areas at the local scale were particularly due to turnover, and at the regional scale to nestedness. Since there was no difference in habitat quality among woodlands across the urbanization gradient, we conclude that landscape urbanization systematically causes poorer and more homogeneous bird communities. However, despite that natural habitats in cities contribute less to the regional diversity, they are critical to maintain the local bird communities of individual cities and their surroundings.</p>
FIGURE 2 in Birds From Cerradão Woodland, An Overlooked Forest Of The Cerrado Region, Brazil
FIGURE 2: Accumulation curve for number of bird species in relation to sample effort from a cerradão fragment in the municipality of Bauru, São Paulo State, Brazil. Sample accumulation order was randomized 50 times.
FIGURE 1 in Birds From Cerradão Woodland, An Overlooked Forest Of The Cerrado Region, Brazil
FIGURE 1: Locations (n = 49) where cerradão bird surveys have been conducted. An arrow indicates the region of Bauru, São Paulo State, southern Brazil. Cerrado is represented by light gray, while Pantanal is represented by dark gray.
Data on bird abundance in urban woodlands in 32 Swedish cities
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Woodland birds benefit from suppression of a despotic competitor following creation of an artificial ‘sink’ habitat through culling
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Data from: Short-term response of a declining woodland bird assemblage to the removal of a despotic competitor
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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