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Journal articles on the topic 'Bird density'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

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1

Iffiong, S. A., I. J. Fulani, and J. M. Olomu. "THE EFFECTS OF STOCKING DENSITY ON THE PERFORMANCE OF BROILER CHICKENS." Nigerian Journal of Animal Production 6 (January 19, 2021): 21–25. http://dx.doi.org/10.51791/njap.v6i.2652.

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THREE trials were conducted to determine the optimum stocking density for broiler chickens raised in a tropical environment In Trial 1, 100,67, 50,40, 34 and 29 birds were placed in duplicates in each pen with an area of 3.72 M2 to give stocking densities of 0.037, 0.056, 0.074, 0.093, 0.10 and 0 128 M2 per bird respectively. In Trial 2, stocking densities of 0.046, 0056, 0.064, 0.074, 0.083 and 0.093 M2 per bird were compared. Trial 3 involved studying the effects of providing equal feeder space (5cm/bird) or equal number of similar sized feeders (2 feeders per pen) when birds were stocked at

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Loe, Leif Egil, Atle Mysterud, Audun Stien, Harald Steen, Darren M. Evans, and Gunnar Austrheim. "Positive short-term effects of sheep grazing on the alpine avifauna." Biology Letters 3, no. 1 (2006): 110–12. http://dx.doi.org/10.1098/rsbl.2006.0571.

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Abstract Grazing by large herbivores may negatively affect bird populations. This is of great conservation concern in areas with intensive sheep grazing. Sheep management varies substantially between regions, but no study has been performed in less intensively grazed systems. In a fully replicated, landscape scale experiment with three levels of sheep grazing, we tested whether the abundance and diversity of an assemblage of mountain birds were negatively affected by grazing or if grazing facilitated the bird assemblage. Density of birds was higher at high sheep density compared with low sheep

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Perkins, Genevieve C., Amanda E. Martin, Adam C. Smith, and Lenore Fahrig. "Weak Effects of Owned Outdoor Cat Density on Urban Bird Richness and Abundance." Land 10, no. 5 (2021): 507. http://dx.doi.org/10.3390/land10050507.

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Domestic cats (Felis catus) are ubiquitous predators of birds in urban areas. In addition to the lethal effect of predation, there can also be sublethal, negative effects of domestic cats on individual birds. These effects have led to the inference that reducing outdoor cat densities would benefit urban bird communities. Here we estimate the likely result of policies/programs designed to reduce densities of owned outdoor cats in urban areas, estimating relationships between bird richness/abundance and cat densities across 58 landscapes in Ottawa, Ontario, Canada. We estimate that we would most

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Shao, Quan, Yan Zhou, Pei Zhu, Yan Ma, and Mengxue Shao. "Key Factors Assessment on Bird Strike Density Distribution in Airport Habitats: Spatial Heterogeneity and Geographically Weighted Regression Model." Sustainability 12, no. 18 (2020): 7235. http://dx.doi.org/10.3390/su12187235.

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Although the factors influencing bird strikes have been studied extensively, few works focused on the spatial variations in bird strikes affected by factors due to the difference in the geographical environment around the airport. In this paper, the bird strike density distribution of different seasons affected by factors in a rectangular region of 800 square kilometers centered on the Xi’an Airport runway was investigated based on collected bird strike data. The ordinary least square (OLS) model was used to analyze the global effects of different factors, and the Geographically Weighted Regre

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Lovász, Lilla, Fränzi Korner-Nievergelt, and Valentin Amrhein. "Grazer density and songbird counts in a restored conservation area." PeerJ 9 (January 5, 2021): e10657. http://dx.doi.org/10.7717/peerj.10657.

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Grazing by large herbivores is increasingly used as a management tool in European nature reserves. The aim is usually to support an open but heterogeneous habitat and its corresponding plant and animal communities. Previous studies showed that birds may profit from grazing but that the effect varies among bird species. Such studies often compared bird counts among grazed areas with different stocking rates of herbivores. Here, we investigated how space use of Konik horses and Highland cattle is related to bird counts in a recently restored conservation area with a year-round natural grazing ma

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Hager, Stephen B., Heidi Trudell, Kelly J. McKay, Stephanie M. Crandall, and Lance Mayer. "Bird density and mortality at windows." Wilson Journal of Ornithology 120, no. 3 (2008): 550–64. http://dx.doi.org/10.1676/07-075.1.

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Omotoriogun, Taiwo Crossby, Joseph Daniel Onoja, Talatu Tende, Shiiwua Manu, and Ulf Ottosson. "Density and diversity of birds in the wetlands of Yankari Game Reserve Bauchi Nigeria." Journal of Wetlands Ecology 5 (December 28, 2011): 48–58. http://dx.doi.org/10.3126/jowe.v5i0.4778.

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The biological, chemical, and physical operations and attributes of wetlands are vital in facilitating food resources, water, and shelter, which many terrestrial bird and waterbird species rely on for their daily requirments. Wetlands in Yankari Game Reserve, Nigeria are key stone ecosystem that provides a stopover, breeding and/or foraging platform for migratory and resident birds. This study determined the density and diversity of birds in the wetlands of Yankari Game Reserve. Ten wetlands within the reserve were identified and surveyed. The sizes (kilometer square) and isolation distances (

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8

Asaniyan, E. K., and V. O. Akinduro. "Impact of stocking density on the rearing environment and growth performance of broiler chicken." Nigerian Journal of Animal Production 47, no. 6 (2021): 65–81. http://dx.doi.org/10.51791/njap.v47i6.2875.

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The consequence of high stocking density in commercial production of broiler chickens under the changing climate could predispose the chickens to adverse conditions. Therefore, this study was conducted to investigate the influence of stocking density on the rearing environment and performance of broiler chicken. Ninety (90) one day-old chicks of Arbor acre breed were used as experimental units in the trial that lasted eight (8) weeks. The bird were randomly assigned to three treatments of stocking densities 5, 10 and 15 birds/m2 with three replicates per treatment. The birds were raised in dee

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Manhães, MA, and MM Dias. "Spatial dynamics of understorey insectivorous birds and arthropods in a southeastern Brazilian Atlantic woodlot." Brazilian Journal of Biology 71, no. 1 (2011): 1–7. http://dx.doi.org/10.1590/s1519-69842011000100003.

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Spatial distribution and spatial relationships in capture rates of understorey insectivorous birds and density of arthropods were investigated in a patch of upper montane rain forest in Minas Gerais state, southeastern Brazil, from January to December 2004. The composition of the arthropod fauna collected was similar to that reported for other tropical forests, with predominance of Araneae, Coleoptera, Hymenoptera and Hemiptera non-Heteroptera. A total of 26 bird species were captured, among which the more common were Dysithamnus mentalis, Conopophaga lineata, Platyrinchus mystaceus, Basileute

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10

Aronson, Myla F. J., Frank A. La Sorte, Charles H. Nilon, et al. "A global analysis of the impacts of urbanization on bird and plant diversity reveals key anthropogenic drivers." Proceedings of the Royal Society B: Biological Sciences 281, no. 1780 (2014): 20133330. http://dx.doi.org/10.1098/rspb.2013.3330.

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Urbanization contributes to the loss of the world's biodiversity and the homogenization of its biota. However, comparative studies of urban biodiversity leading to robust generalities of the status and drivers of biodiversity in cities at the global scale are lacking. Here, we compiled the largest global dataset to date of two diverse taxa in cities: birds (54 cities) and plants (110 cities). We found that the majority of urban bird and plant species are native in the world's cities. Few plants and birds are cosmopolitan, the most common being Columba livia and Poa annua . The density of bird

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11

Sacchi, Roberto, Augusto Gentilli, Edoardo Razzetti, and Francesco Barbieri. "Effects of building features on density and flock distribution of feral pigeons Columba livia var. domestica in an urban environment." Canadian Journal of Zoology 80, no. 1 (2002): 48–54. http://dx.doi.org/10.1139/z01-202.

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We censused feral pigeons (Columba livia) living in Milan, Italy (a 181-km2 area), between July 1999 and February 2000 by means of linear transects to examine population densities in different urban habitats and the relationships between population density and structural features of buildings. The pigeon population of Milan was 103 650 birds, with an average density of 570/km2. Population density increased significantly from farmland (434 birds/km2) to the suburbs (604 birds/km2) and from the suburbs to the centre of the city (2083 birds/km2). There was a positive relationship between both bir

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Benoy, Glenn A. "Variation in tiger salamander density within prairie potholes affects aquatic bird foraging behaviour." Canadian Journal of Zoology 83, no. 7 (2005): 926–34. http://dx.doi.org/10.1139/z05-081.

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Through competitive asymmetry, coexisting fish populations can alter aquatic bird distributions and reduce the reproductive success of their offspring. Gray tiger salamanders (Ambystoma mavortium diaboli Dunn, 1940) may function similarly in fishless prairie potholes. To test the hypothesis that tiger salamanders compete with aquatic birds (including ducks, grebes, and American Coot (Fulica americana J.F. Gmelin, 1789)) for prey resources during the breeding season, 16 potholes were divided into halves by an impermeable plastic barrier and tiger salamander densities were increased or decreased

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13

Moyers, Sahnzi C., James S. Adelman, Damien R. Farine, Courtney A. Thomason, and Dana M. Hawley. "Feeder density enhances house finch disease transmission in experimental epidemics." Philosophical Transactions of the Royal Society B: Biological Sciences 373, no. 1745 (2018): 20170090. http://dx.doi.org/10.1098/rstb.2017.0090.

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Anthropogenic food provisioning of wildlife can alter the frequency of contacts among hosts and between hosts and environmental sources of pathogens. Despite the popularity of garden bird feeding, few studies have addressed how feeders influence host contact rates and disease dynamics. We experimentally manipulated feeder density in replicate aviaries containing captive, pathogen-naive, groups of house finches ( Haemorhous mexicanus ) and continuously tracked behaviours at feeders using radio-frequency identification devices. We then inoculated one bird per group with Mycoplasma gallisepticum

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14

Woinarski, JCZ, SC Tidemann, and S. Kerin. "Birds in a Tropical Mosaic - the Distribution of Bird Species in Relation to Vegetation Patterns." Wildlife Research 15, no. 2 (1988): 171. http://dx.doi.org/10.1071/wr9880171.

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Wilson and Bowman (1986) classified and mapped vegetation in a complex mosaic at Howard's Peninsula, Northern Territory. The relationship of bird distribution to this vegetation classification was considered through 10 repeat censuses of 5 replicate quadrats in each of 20 vegetation units. Censusing period was April-May. 118 bird species were recorded. Closed forests (3 units), mangroves (2 units) and swamplands (3 units) all had distinctive bird species compositions, but bird species showed a relatively poor relationship with the classification of woodland and grassland units. Eucalyptus wood

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15

Pyke, GH, and HF Recher. "Estimated Forest Bird Densities by Variable Distance Point Counts." Wildlife Research 12, no. 2 (1985): 307. http://dx.doi.org/10.1071/wr9850307.

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During variable distance point counts a stationary observer records the species and distance for all birds detected during a fixed time interval. Such counts, repeated throughout the area of interest, can be used to estimate bird density so long as the following assumptions are made: (1) the distribution of birds is unaffected by the observer; (2) observers are certain of detecting near birds; (3) there is no error in measurement or estimation of distances; and (4) birds are stationary. Data collected during the present study indicated that at least two of these assumptions are not satisfied:

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16

Kim, Jin-Yong, Sanghun Lee, Man-Seok Shin, Chang-Hoon Lee, Changwan Seo, and Soo Hyung Eo. "Altitudinal patterns in breeding bird species richness and density in relation to climate, habitat heterogeneity, and migration influence in a temperate montane forest (South Korea)." PeerJ 6 (May 23, 2018): e4857. http://dx.doi.org/10.7717/peerj.4857.

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Altitudinal patterns in the population ecology of mountain bird species are useful for predicting species occurrence and behavior. Numerous hypotheses about the complex interactions among environmental factors have been proposed; however, these still remain controversial. This study aimed to identify the altitudinal patterns in breeding bird species richness or density and to test the hypotheses that climate, habitat heterogeneity (horizontal and vertical), and heterospecific attraction in a temperate forest, South Korea. We conducted a field survey of 142 plots at altitudes between 200 and 1,

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17

Cody, Martin. "Breeding Bird Popluations in Grand Teton National Park: Density and Distribution." UW National Parks Service Research Station Annual Reports 19 (January 1, 1995): 19–23. http://dx.doi.org/10.13001/uwnpsrc.1995.3233.

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GTNP (Grand Teton National Park) recently initiated a breeding bird monitoring program, with a view toward assessing population densities of breeding birds and their potential changes, both of residents and neotropical migrants; the 1995 season was the first in which the monitoring protocols of the program were fully instigated. The program goals are the monitoring of both species and densities over a broad range of habitats within the park, with a view to detecting changes over time in these variables, in year-to-year "background" variation and in possible long-term trends. Site selection, ma

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18

Lima, L. R. De, J. A. D. Barbosa Filho, E. R. Freitas, et al. "Effect of Different Breeding Densities and Inclusion of Soybean Oil on Performance, Carcass Trait and Heat Loss in Meat Quails." Journal of Agricultural Science 11, no. 7 (2019): 130. http://dx.doi.org/10.5539/jas.v11n7p130.

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Quails are homeothermic animals, in countries with a tropical climate, such as Brazil, birds face great difficulties in controlling body temperature inside the sheds. Several practices are being studied in order to keep these animals within the thermal comfort zone, and thus, to minimize the effects of thermal stress, partial substitution of carbohydrates by oils and changes in density are some of them. The objective of this study was to evaluate the different breeding densities and inclusion levels of soybean oil in performance, carcass characteristics and heat loss in quail. 450 quails, seve

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19

Carrascal, L. M., and J. L. Telleria. "Bird Size and Density: A Regional Approach." American Naturalist 138, no. 3 (1991): 777–84. http://dx.doi.org/10.1086/285250.

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20

Dawson, Deanna K., and Murray G. Efford. "Bird population density estimated from acoustic signals." Journal of Applied Ecology 46, no. 6 (2009): 1201–9. http://dx.doi.org/10.1111/j.1365-2664.2009.01731.x.

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21

Grundel, Ralph, and Noel B. Pavlovic. "Response of Bird Species Densities to Habitat Structure and Fire History Along a Midwestern Open–Forest Gradient." Condor 109, no. 4 (2007): 734–49. http://dx.doi.org/10.1093/condor/109.4.734.

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Abstract Oak savannas were historically common but are currently rare in the Midwestern United States. We assessed possible associations of bird species with savannas and other threatened habitats in the region by relating fire frequency and vegetation characteristics to seasonal densities of 72 bird species distributed across an open–forest gradient in northwestern Indiana. About one-third of the species did not exhibit statistically significant relationships with any combination of seven vegetation characteristics that included vegetation cover in five vertical strata, dead tree density, and

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22

Srivastava, U. C., Durgesh Singh, Prashant Kumar, and Sippy Singh. "Neuronal diversity and their spine density in the hippocampal complex of the House Crow (Corvus splendens), a food-storing bird." Canadian Journal of Zoology 94, no. 8 (2016): 541–53. http://dx.doi.org/10.1139/cjz-2015-0260.

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Hippocampus, one of the parts included in the limbic system, is involved in various functions such as learning, memory, food-storing behavior, and sexual discrimination. Neuronal classes of the hippocampal complex in food-storing birds have been also reported, but the study lacks details pertaining to neuronal characteristics and the spine density of the neurons in different subfields of the hippocampus. Hence, the present study was undertaken with the aim to explore the morphology of neurons and the spines present on their dendrites within the hippocampal complex of the House Crow (Corvus spl

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Schieck, Jim, Marie Nietfeid, and J. Brad Stelfox. "Differences in bird species richness and abundance among three successional stages of aspen-dominated boreal forests." Canadian Journal of Zoology 73, no. 8 (1995): 1417–31. http://dx.doi.org/10.1139/z95-167.

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Birds and vegetation were surveyed in young, mature, and old aspen-dominated boreal forests in Alberta. Height and size of live trees, density of large dead trees, and volume of downed woody material increased during succession, whereas density of live trees decreased. Canopy heterogeneity had a bimodal relationship with succession: old forests had the highest, mature forests the lowest, and young forests an intermediate canopy heterogeneity. Old forests had greater bird species richness than young forests, which in turn had greater richness than mature forests. Twenty-seven, 3, and 10 bird sp

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Adams, Heidi L., L. Wes Burger, and Sam Riffell. "Edge Effects on Avian Diversity and Density of Native Grass Conservation Buffers." Open Ornithology Journal 8, no. 1 (2015): 1–9. http://dx.doi.org/10.2174/1874453201508010001.

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Conservation Reserve Program Conservation Practice 33 (CP33: Conservation Buffers for Upland Birds) provides habitat for grassland birds in agriculture-dominated landscapes. However, landscape context and adjacency of other land covers may influence colonization, occupancy, and reproductive performance of breeding grassland birds in buffers. Our objective was to determine how edge effects influence diversity and density of breeding grassland birds in CP33 buffers. Data collected during transect surveys in CP33 buffers at a privately-owned farm in Clay County, Mississippi, USA during the 2007􀀁2

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Persulessy, Yan Eliazer, and J. D. Putuhena. "A Keragaman dan Populasi Burung Endemik pada Hotspot Kesatuan Pengelolaan Hutan Produksi Wae Sapalewa Seram Utara." MAKILA 14, no. 2 (2020): 99–113. http://dx.doi.org/10.30598/makila.v14i2.2930.

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Endemic bird species have a high conservation value concentrated in a critical location for conservation with an exciting value in endemic bird species groups. The site of concentration of endemic bird species can be referred to as Endemic Bird Diversity Hotspot. There are seven bird diversity hotspot locations identified in the KPHP Wae Sapalewa region in North Seram, with a good bird species diversity, including endemic bird species. The study aimed to examine the variety and population of endemic bird species at seven hotspot locations within kphp Wae Sapalewa. The research method uses Poin

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Glatz, P. C., and Z. H. Miao. "Husbandry of ratites and potential welfare issues: a review." Australian Journal of Experimental Agriculture 48, no. 10 (2008): 1257. http://dx.doi.org/10.1071/ea08136.

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Since the mid-1980s, there has been worldwide farming of ratites, particularly with ostriches, emus and rheas for feathers, meat, skin and oil. Most of these ratites are produced commercially outside their native habitat. This has raised concerns about welfare, particularly whether birds are provided the five freedoms: food and water; shelter; health care; alleviation of pain and suffering; and the freedom of movement. This paper reviews the factors that influence bird welfare before hatch with breeder, egg and hatchery management and after hatch with brooding and rearing systems, stocking den

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Ali, A. A., N. H. Idris, and M. H. I. Ishak. "THE INFLUENCE OF LAND-USE LAND-COVER CHANGES ON URBAN BIRD COMMUNITIES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-4/W16 (October 1, 2019): 93–100. http://dx.doi.org/10.5194/isprs-archives-xlii-4-w16-93-2019.

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Abstract. City development changes the landscape and has been claimed to pose threat to the survival of birds that heavily relies on healthy forest ecosystem. As such, this study assessed the effect of land-use land-cover (LULC) changes due to sub-urbanisation on birds’ community using geostatistical method. In this study, geostatistical analyses, namely Kernel Density and Ordinary Least Square (OLS), were executed to identify the dominant factors that affected the birds’ community in the Johor Bahru region. The birding data were obtained from eBird, an online crowd source database of bird dis

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Herbers, Jim R., Robert Serrouya, and Katherine A. Maxcy. "Effects of elevation and forest cover on winter birds in mature forest ecosystems of southern British Columbia." Canadian Journal of Zoology 82, no. 11 (2004): 1720–30. http://dx.doi.org/10.1139/z04-151.

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Winter diversity, distribution, and density of nonmigratory birds were examined in six mature forest ecosystems from two study areas in southern British Columbia. Forest age ranged from 91 to 150 years and the ecosystems ranged from 500 to 2100 m above sea level. Sampled forest stands had no previous history of logging and were a minimum 30 ha in size. The main objectives of this study were to measure nonmigratory birds in relation to elevation and to percentage of stand-level lodgepole pine composition. Twenty-one nonmigratory bird species totaling 2747 observations were detected at 775 point

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Marques, Tiago A., Len Thomas, Steven G. Fancy, and Stephen T. Buckland. "Improving Estimates of Bird Density Using Multiple- Covariate Distance Sampling." Auk 124, no. 4 (2007): 1229–43. http://dx.doi.org/10.1093/auk/124.4.1229.

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Abstract Inferences based on counts adjusted for detectability represent a marked improvement over unadjusted counts, which provide no information about true population density and rely on untestable and unrealistic assumptions about constant detectability for inferring differences in density over time or space. Distance sampling is a widely used method to estimate detectability and therefore density. In the standard method, we model the probability of detecting a bird as a function of distance alone. Here, we describe methods that allow us to model probability of detection as a function of ad

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Leavesley, Adam J., and Geofferey J. Cary. "The effect of patch area on birds in central Australian mulga (Acacia aneura) woodland of different times-since-fire." Pacific Conservation Biology 19, no. 1 (2013): 28. http://dx.doi.org/10.1071/pc130028.

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It is often assumed that a fine-scaled mosaic of different times-since-fire supports greater biodiversity than a coarsescaled mosaic — the fire mosaic hypothesis. A potential mechanism of the fire mosaic hypothesis is the effect of area on species diversity. We investigated the effect of patch area on bird communities in mulga (Acacia aneura) woodland in central Australia. The study was conducted at Uluru Kata-Tjuta National Park using 55 fixed-area sites classified to the time since last fire: burnt 2002; burnt 1976 and long unburnt. Birds were surveyed in the winter and spring of 2005 and 20

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Blumstein, Daniel T., Douglas R. Mcclain, Carrie De Jesus, and Gustavo Alarcón-Nieto. "Breeding bird density does not drive vocal individuality." Current Zoology 58, no. 5 (2012): 765–72. http://dx.doi.org/10.1093/czoolo/58.5.765.

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Abstract Many species produce individually specific vocalizations and sociality is a hypothesized driver of such individuality. Previous studies of how social variation influenced individuality focused on colonial or non-colonial avian species, and how social group size influenced individuality in sciurid rodents. Since sociality is an important driver of individuality, we expected that bird species that defend nesting territories in higher density neighborhoods should have more individually-distinctive calls than those that defend nesting territories in lower-density neighborhoods. We used Be

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Aberle, M. A., K. E. Langwig, J. S. Adelman, and D. M. Hawley. "Effects of bird feeder density on the foraging behaviors of a backyard songbird (the House Finch, Haemorhous mexicanus) subject to seasonal disease outbreaks." Canadian Journal of Zoology 98, no. 9 (2020): 611–21. http://dx.doi.org/10.1139/cjz-2019-0282.

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Provisioning of wildlife, such as backyard bird feeding, can alter animal behavior and ecology in diverse ways. For species that are highly dependent on supplemental resources, it is critical to understand how variation in the degree of provisioning, as occurs naturally across backyards, alters wildlife behavior and ecology in ways potentially relevant to disease spread. We experimentally manipulated feeder density at suburban sites and tracked local abundance, foraging behaviors, body mass, and movement in House Finches (Haemorhous mexicanus (P.L. Statius Müller, 1776)), the primary host of a

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Schuler, Carol A., William H. Rickard, and Glen A. Sargeant. "Conservation of Habitats for Shrubsteppe Birds." Environmental Conservation 20, no. 1 (1993): 57–64. http://dx.doi.org/10.1017/s037689290003722x.

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Extending over a year, all the birds that could be detected were counted on two transects which together sampled an area of 1.39 km2. Only 37 species were recorded during 82 surveys. Total bird density during the spring (March–June) was 43.0 birds/km2, and the density for the entire year was 26.7 birds/km2. The characteristic nesting birds were Western Meadowlark, Sage Sparrow, Burrowing Owl, Mourning Dove, Horned Lark, Long-billed Curlew, Lark Sparrow, and Loggerhead Shrike. Western Meadow-larks and Sage Sparrows were the most abundant nesting birds, having an average density of 11.2 and 7.8

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Das, Delip K., Mohammad Mostafa Feeroz, and Sajeda Begum. "Diversity and population density of birds at the Jahangirnagar University campus, Bangladesh." Bangladesh Journal of Zoology 48, no. 2 (2021): 289–300. http://dx.doi.org/10.3329/bjz.v48i2.52369.

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Rapid urbanization is changing the habitats of many wildlife species. Even so, certain species appear to adapt and now have thriving populations within cities. To look at the capacity for these spaces to provide “habitat” we examined population density of bird species using Jahangirnagar University campus close to the Dhaka mega city, Bangladesh. Four strip transects were surveyed from March 2008 to February 2009 (12 times/transect). A total of 101 species were found along the transect areas. The density of Lesser Whistling Duck (Dendrocygna javanica) was the highest 107.02indiv. /ha while Lar

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Dokter, Adriaan M., Felix Liechti, Herbert Stark, Laurent Delobbe, Pierre Tabary, and Iwan Holleman. "Bird migration flight altitudes studied by a network of operational weather radars." Journal of The Royal Society Interface 8, no. 54 (2010): 30–43. http://dx.doi.org/10.1098/rsif.2010.0116.

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A fully automated method for the detection and quantification of bird migration was developed for operational C-band weather radar, measuring bird density, speed and direction as a function of altitude. These weather radar bird observations have been validated with data from a high-accuracy dedicated bird radar, which was stationed in the measurement volume of weather radar sites in The Netherlands, Belgium and France for a full migration season during autumn 2007 and spring 2008. We show that weather radar can extract near real-time bird density altitude profiles that closely correspond to th

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Putri, Indra A. S. L. P., Bayu Wisnu Broto, and Fajri Ansari. "Bird responses to habitat change in the karst area of Bantimurung Bulusaraung National Park." Jurnal Penelitian Kehutanan Wallacea 6, no. 2 (2017): 101. http://dx.doi.org/10.18330/jwallacea.2017.vol6iss2pp101-112.

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Birds are useful bioindicators to habitat changes. This study aims to determine the responses of birds to habitat change at Maros-Pangkep karst area, Bantimurung-Bulusaraung National Park. The research was carried out in three disturbance degrees (core-zone, wilderness-zone, and the community-gardens), which represents minimal, middle, and high interference level. A modified square-line method was used to observe vegetation of bird habitat. Point count method was used to observe bird population. Data of the bird habitat vegetation was analyzed using vegetation density. The difference of vegeta

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Sasvári, L., J. Török, and L. Tóth. "Density dependent effects between three competitive bird species." Oecologia 72, no. 1 (1987): 127–30. http://dx.doi.org/10.1007/bf00385056.

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Solomou, Alexandra, and Athanassios Sfougaris. "Comparing conventional and organic olive groves in central Greece: plant and bird diversity and abundance." Renewable Agriculture and Food Systems 26, no. 4 (2011): 297–316. http://dx.doi.org/10.1017/s1742170511000111.

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AbstractThe present study was conducted in Magnesia Prefecture, central Greece, during the period May–June 2007. It aimed at the comparison between conventional and certified organic olive groves with regard to olive and olive oil production, diversity of plants (herbaceous and woody) and diversity and abundance of avifauna. Correlations between variables within herbaceous plants (linear regression) and woody plants (Principal Component Analysis), and the role of integration time of olive groves to the organic system were investigated. Also, finding easily measurable parameters indicating high

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Monroe, Adrian P., David R. Edmunds, Cameron L. Aldridge, Matthew J. Holloran, Timothy J. Assal, and Alison G. Holloran. "Prioritizing landscapes for grassland bird conservation with hierarchical community models." Landscape Ecology 36, no. 4 (2021): 1023–38. http://dx.doi.org/10.1007/s10980-021-01211-z.

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Abstract Context Given widespread population declines of birds breeding in North American grasslands, management that sustains wildlife while supporting rancher livelihoods is needed. However, management effects vary across landscapes, and identifying areas with the greatest potential bird response to conservation is a pressing research need. Objectives We developed a hierarchical modeling approach to study grassland bird response to habitat factors at multiple scales and levels. We then identified areas to prioritize for implementing a bird-friendly ranching program. Methods Using bird survey

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Michel, Nicole L., Thomas W. Sherry, and Walter P. Carson. "The omnivorous collared peccary negates an insectivore-generated trophic cascade in Costa Rican wet tropical forest understorey." Journal of Tropical Ecology 30, no. 1 (2013): 1–11. http://dx.doi.org/10.1017/s0266467413000709.

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Abstract:Insectivorous birds and bats often protect plants through density- and trait-mediated cascades, but the degree to which insectivores reduce herbivorous arthropods and leaf damage varies among systems. Top-down interaction strength may be influenced by the biotic and abiotic context, including the presence of vegetation-disturbing animals. We tested two hypotheses: (1) insectivorous birds and bats initiate trophic cascades in tropical rain-forest understorey; and (2) the native, omnivorous collared peccary (Pecari tajacu) negates these cascades via non-trophic effects. We studied the t

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Yackel Adams, Amy A., Melia G. Nafus, Page E. Klug, et al. "Contact rates with nesting birds before and after invasive snake removal: estimating the effects of trap-based control." NeoBiota 49 (July 22, 2019): 1–17. http://dx.doi.org/10.3897/neobiota.49.35592.

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Invasive predators are responsible for almost 60% of all vertebrate extinctions worldwide with the most vulnerable faunas occurring on islands. The brown treesnake (Boigairregularis) is a notorious invasive predator that caused the extirpation or extinction of most native forest birds on Guam. The success of avian reintroduction efforts on Guam will depend on whether snake-control techniques sufficiently reduce contact rates between brown treesnakes and reintroduced birds. Mouse-lure traps can successfully reduce brown treesnake populations at local scales. Over a 22-week period both with and

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Régnière, Jacques, Lisa Venier, and Dan Welsh. "Avian Predation in a Declining Outbreak Population of the Spruce Budworm, Choristoneura fumiferana (Lepidoptera: Tortricidae)." Insects 12, no. 8 (2021): 720. http://dx.doi.org/10.3390/insects12080720.

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The impact of avian predation on a declining population of the spruce budworm, Choristoneura fumifereana (Clem.), was measured using single-tree exclosure cages in a mature stand of balsam fir, Abies balsamea (L.), and white spruce, Picea glauca (Moench.) Voss. Bird population censuses and observations of foraging and nest-feeding activity were also made to determine the response of budworm-linked warblers to decreasing food availability. Seasonal patterns of foraging. as well as foraging success in the declining prey population was compared to similar information from birds observed in anothe

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Simon, N. PP, F. E. Schwab, and R. D. Otto. "Songbird abundance in clear-cut and burned stands: a comparison of natural disturbance and forest management." Canadian Journal of Forest Research 32, no. 8 (2002): 1343–50. http://dx.doi.org/10.1139/x02-057.

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To evaluate the efficacy of forest management to emulate natural disturbance, we compared bird abundances among burned and clear-cut, former black spruce (Picea mariana (Mill.) BSP) sites, after 5, 14, and 27 years of succession. Total bird density was lower in clear-cut sites resulting from fewer hermit thrushes, yellow warblers, Swainson's thrushes, and fox sparrows. Hermit thrushes were positively correlated with snag density while yellow warblers and Swainson's thrushes were positively associated with deciduous tree cover and negatively correlated with conifer cover. Only yellow-rumped war

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Hoefer, Christopher J. "Marine Bird Attraction to Thermal Fronts in the California Current System." Condor 102, no. 2 (2000): 423–27. http://dx.doi.org/10.1093/condor/102.2.423.

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AbstractI relate marine bird density to the 55 strongest thermal fronts encountered during a survey of much of the eastern portion of the California Current and the adjacent coastal upwelling region. Elevated densities were recorded for all marine bird taxa except the Leach's Storm-Petrel (Oceanodroma leucorhoa). The variance explained by the regression models ranged from 3% for the Leach's Storm-Petrel to 85% for all marine birds. The response observed is notably stronger than previous analyses with similar data.

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L. Oliver, Damon, Andrew J. Ley, Hugh A. Ford, and Beth Williams. "Habitat of the Regent Honeyeater Xanthomyza phrygia and the value of the Bundarra-Barraba region for the conservation of avifauna." Pacific Conservation Biology 5, no. 3 (1999): 224. http://dx.doi.org/10.1071/pc990224.

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Five types of woodland and forest in the Bundarra-Barraba region of northern New South Wales were surveyed for Regent Honeyeaters Xanthomyza phrygia and other birds over two years. Regent Honeyeaters were found in 24 of the 93 transects, at a density of 0.09 birds/ha. Most were found in box-ironbark woodland (34% of 62 sites), with single records from box-gum woodland, box-stringybark woodland and dry plateau complex woodland. No Regent Honeyeaters were found in riparian gallery forest during censuses, but they were found breeding there at other times. All habitats contained a high density of

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Wang, F. S., Z. F. Yue, and W. Z. Yan. "Factors Study Influencing on Numerical Simulation of Aircraft Windshield against Bird Strike." Shock and Vibration 18, no. 3 (2011): 407–24. http://dx.doi.org/10.1155/2011/304541.

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The combined model of UniGraphics(UG) and ANSYS-LS-DYNA software and finite element (FE) model of aircraft windshield and windshield structure for bird strike were built. The windshield structure is composed of windshield, framework, arc-frame and gasket. The factors influencing on dynamic response for bird strike were analyzed such as bird velocity, mesh density of windshield, mesh density of bird, boundary condition, material model of windshield, analytic methods and components of windshield structure. The results showed that these factors must be taken into account when FE analysis method i

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Tassicker, A. L., A. S. Kutt, E. Vanderduys, and S. Mangru. "The effects of vegetation structure on the birds in a tropical savanna woodland in north-eastern Australia." Rangeland Journal 28, no. 2 (2006): 139. http://dx.doi.org/10.1071/rj05029.

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Management of the dynamics of woody vegetation in Australia’s tropical savannas is a vexing issue for both pastoralists and conservation biologists. In savanna regions around the world, increasing density of woody vegetation contributes to declines in pastoral productivity, but its effects on native fauna are largely unknown. In this paper we examine the avifauna in savanna woodlands of varying structure in the Desert Uplands bioregion, Queensland. Vegetation cover maps derived from aerial photographs were used to choose 60 sites, across 4 cattle stations. We sampled sites mapped at 30–45% and

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Rajpar, Muhammad Nawaz, and Mohamed Zakaria. "Bird Species Abundance and Their Correlationship with Microclimate and Habitat Variables at Natural Wetland Reserve, Peninsular Malaysia." International Journal of Zoology 2011 (2011): 1–17. http://dx.doi.org/10.1155/2011/758573.

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Birds are the most conspicuous and significant component of freshwater wetland ecosystem. Presence or absence of birds may indicate the ecological conditions of the wetland area. The objectives of this study were to determine bird species abundance and their relationship with microclimate and habitat variables. Distance sampling point count method was applied for determining species abundance and multiple regressions was used for finding relationship between bird species abundance, microclimate and habitat variables. Bird species were monitored during November, 2007 to January, 2009. A total o

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Phillips, Hannah N., and Bradley J. Heins. "Effects of Outdoor Stocking Density on Growth, Feather Damage and Behavior of Slow-Growing Free-Range Broilers." Animals 11, no. 3 (2021): 688. http://dx.doi.org/10.3390/ani11030688.

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Access to pasture is a main benefit of free-range broiler housing systems, yet the level of outdoor stocking density on broiler animal welfare remains unsettled. The growth, feather damage, pasture ranging and behaviors were assessed for 150 mixed-sex, slow-growing Freedom Rangers from 5 to 11 weeks of age of with free access to either a high outdoor stocking density pasture (0.5 m2 per bird) or a low outdoor stocking density pasture (2.5 m2 per bird). The probability (mean, 95% CI) of tail feather damage was greater for the high-density (23.1%, 16.3 to 31.7%) compared to the low-density group

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Nussbaumer, Raphaël, Baptiste Schmid, Silke Bauer, and Felix Liechti. "A Gaussian Mixture Model to Separate Birds and Insects in Single-Polarization Weather Radar Data." Remote Sensing 13, no. 10 (2021): 1989. http://dx.doi.org/10.3390/rs13101989.

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Recent and archived data from weather radar networks are extensively used for the quantification of continent-wide bird migration patterns. While the process of discriminating birds from weather signals is well established, insect contamination is still a problem. We present a simple method combining two Doppler radar products within a Gaussian mixture model to estimate the proportions of birds and insects within a single measurement volume, as well as the density and speed of birds and insects. This method can be applied to any existing archives of vertical bird profiles, such as the European

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