scholarly journals Пространственно-типологическая структура и организация населения птиц Тоболо-Иртышской лесостепи и степи Западной Сибири и Северного Казахстана во второй половине лета.

2021 ◽  
pp. 51-60
Author(s):  
S. A. Soloviev ◽  
◽  
L. G. Vartapetov ◽  
Keyword(s):  
Western Siberia ◽  
Coincidence Degree ◽  
Bird Species ◽  
Hierarchical Classification ◽  
Bird Communities ◽  
Bird Population ◽  
Bird Populations ◽  
Structural Graph ◽  
Natural Factors ◽  
The Impact

According to the results of bird counts carried out in 138 habitats over 12 years, a hierarchical classification and a structural graph of the similarity of ornithocomplexes in the plain southwestern part of Western Siberia and Northern Kazakhstan have been compiled in the period from 1982 till 2002. The hierarchical classification contains six types of bird populations. The similarity graph is built at the level of types and is represented by three rows (trends). One row consists of bird complexes of residential and recreational areas; the second, of wetlands; and the third, of forest, forest-field, and steppe habitats. The classification taxa characteristics contain information on the three most numerous bird species (leaders in abundance), their share in the community, population density, and the background species wealth. Based on the assessment of the similarity coincidence degree for the of bird communities and environmental factors, a hierarchy of the impact of the main anthropogenic and natural factors, determining the bird population formation, has been established.

Spring Bird Community Structure in Response to Habitat Heterogeneity in a Subtropical Hilly Landscape

2014 ◽  
Vol 1010-1012 ◽  
pp. 121-125
Author(s):  
Wen Bin Li ◽  
Zhi Ming Mo ◽  
Xing Ting Chen ◽  
Chun Huang ◽  
Ming Feng Xu
Keyword(s):  
Indicator Species ◽  
Habitat Heterogeneity ◽  
Southern China ◽  
Bird Species ◽  
Bird Communities ◽  
Bird Diversity ◽  
Indicator Species Analysis ◽  
Heterogeneous Habitats ◽  
Species Analysis ◽  
The Impact

To examine the impact of habitat heterogeneity on the bird communities, we investigated the structural differences of various bird communities occurring in heterogeneous habitats in the subtropical hilly areas of southern China. We used indicator Species Analysis (ISA) to test the association of specific bird species to particular habitats. We performed Two-way Cluster Analysis to find species patterning in response to habitat fragmentation. Our results demonstrated that heterogeneous habitats promoted bird diversity and human activities affected bird behavior. Indicator Species Analysis demonstrated that similar habitats had similar bird communities, while different habitats supported various bird indicator species. Although habitat diversity increased bird diversity of a region, it was unfavorable for the maintenance of specialized birds in the forests of the subtropical hilly area.

scholarly journals Monitoring Breeding Bird Populations in Grand Teton National Park: 1995-1997

1997 ◽  
Vol 21 ◽  
pp. 13-25
Author(s):  
Martin Cody ◽  
Stephen Cain
Keyword(s):  
Breeding Season ◽  
National Park ◽  
Management Strategies ◽  
Bird Species ◽  
Breeding Habitat ◽  
Breeding Bird ◽  
Grand Teton National Park ◽  
Bird Populations ◽  
The Impact

In summer 1997 our NPS-funded project # CA-1460-5-0010, covering a 3-y period from summer 1995 through summer 1997, was completed. The immediate goals of the project were to instigate a system for monitoring the densities of breeding bird species, by establishment of flxed sites as a basis for a long term monitoring plan and of census protocols that can detect changes of breeding species and their densities over successive years. The monitoring scheme is conducted largely within Grand Teton National Park (GTNP), but covers habitats and an avifauna representative of the Greater Yellowstone Ecosystem (GYE) and the central-northern Rocky Mountains in general. The project emphasizes the need for long­term and on-going studies on breeding bird species and densities and their importance as a tool for evaluating the impact of both local and distant influences on breeding bird populations. For residents, species that remain all year in or near the breeding habitat, local effects include those operating on-site during the non-breeding season as well as during the breeding season. For migrant species, those that breed on-site but leave to spend the non-breeding season in other locations, often distant and usually of quite different habitat composition, there are both on-site influences on breeding population densities, such as inter-year changes in vegetation structure and productivity, and off-site or distant influences, including factors that affect over-wintering success in the non­breeding habitat and others that influence a successful transit between wintering and breeding grounds. The assessment of long-term trends in bird densities may be used as a form of bioassay of the state of the local environments. Information from such studies can provide region-wide indicators that, given a sufficiently comprehensive data base, can segregate local from distant influences on populations. Such indicators can be incorporated into management strategies to aid in determining which local strategies may be necessary (and feasible) to help maintain the biota.

scholarly journals Breeding Bird Communities in a Naturally Fragemented Forest Ecosystem in Grand Teton National Park

1998 ◽  
Vol 22 ◽  
pp. 37-37
Author(s):  
Gregory Schrott
Keyword(s):  
Habitat Fragmentation ◽  
National Park ◽  
Bird Species ◽  
Bird Communities ◽  
Western North America ◽  
Breeding Bird ◽  
Grand Teton National Park ◽  
Bird Populations ◽  
Natural Processes

This project examined the bird species breeding in the morainal forests on the valley floor in Grand Teton National Park. These forests are very patchily distributed and range in size from less than 1 hectare to over 700 hectares, allowing for a unique opportunity to study the responses of the local bird species to a forest system that has been fragmented for centuries through natural processes. This information can be useful for predicting the potential long-term impacts of human-caused forest fragmentation on bird populations in western North America. Until quite recently very little was known of the tolerances of western forest bird species to habitat fragmentation and this project could represent an important step towards understanding their needs in this regard.

A ROLE OF WILD BIRD POPULATION IN THE TRANSMISSION OF PARASITIC FLATWORMS (PLATYHELMINTHES: CESTOIDEA AND TREMATODEA) IN VIETNAM’S FOREST

2020 ◽  
Vol 65 (10) ◽  
pp. 99-107
Author(s):  
Boyko Georgiev B. ◽  
Jean Mariaux ◽  
Gergana Vasileva P ◽  
Huy Nguyen Quoc ◽  
Manh Vu Quang
Keyword(s):  
National Parks ◽  
Wild Bird ◽  
Bird Species ◽  
Point Of View ◽  
Avian Species ◽  
Mountainous Region ◽  
Bird Population ◽  
Bird Populations ◽  
Avian Populations

The study aimed to evaluate the role of transmitting flatworms (Cestoidea and Trematodea) of wild bird populations in three national parks of Vietnam: Xuan Son in the Northwest mountainous region, Tam Dao in the Northeast mountainous region, and Cat Ba in the Hong River Delta region. Twenty-two wild avian species of 10 families were found to contain parasitic flatworms. According to the number of avian species containing parasitic flatworms, bird families are ranking: Timaliidae recorded with 7 species > Leiothrichidae and Nectariniidae both with 3 species > Pycononotidae and Muscicapidae both with 2 species > Vireonidae, Sylvidae, Picidae, Cisticolidae and Cettiidae with 1 species. According to sex, avian populations containing parasitic flatworms decrease in the order: females accounting for 43.94% of the total individuals > males for 39.40% > juveniles for 16.66%. Three bird species containing flatworms A. pallidus, M. gularis and C. bayumas were found in two of the studied national parks, among them, only the first species was found common to all three studied national parks. They are vectors of high significance from a parasitological point of view.

scholarly journals Пространственное распределение птиц Алданского нагорья.

2021 ◽  
pp. 39-50
Author(s):  
E. V. Shemyakin ◽  
◽  
L. G. Vartapetov ◽  
A. G. Larionov ◽  
◽  
...  
Keyword(s):  
Bird Species ◽  
Hierarchical Classification ◽  
Forest Steppe ◽  
Meadow Steppe ◽  
Bird Population ◽  
Burned Areas ◽  
Multivariate Factor Analysis ◽  
Steppe Meadow ◽  
Similar Classification

The results of bird route censuses, conducted on the territory of the Aldan Highland in the first half of summer and generally covering the period from 2000 to 2019, were analyzed. The total length of the routes was about 2815 km. A total of 116 initial variants of the bird population were used. Based on the results of multivariate factor analysis for 160 species registered in these censuses, a hierarchical classification of their preference for habitats was drawn up. The classification showed that 45 % of birds prefer forests, woodlands and burned areas, 26.2 % - water bodies and their banks, 13.8 % - bogs and meadows, 9.4 % - villages and cities, 5.6 % - mountain tundra. A comparative analysis with a similar classification for the Altai Highland has been performed. The main differences in the territorial distribution of bird species in the Aldan Highland and Altai lie in a smaller number of identified types of preferences in our region. Due to the homogeneity of forest biotopes and the absence of the steppe, forest-steppe, subnival, and nival zones in the Aldan Highland, the corresponding landscapes are not represented here, which determines the absence of the steppe, forest-meadow-steppe, meadow-bog, and subnival types. Similarly to Altai, the forest, tundra and synanthropic types of preference are distinguished in the Aldan Highland.

scholarly journals SPECIES COMPOSITION AND TERRITORIAL DISTRIBUTION OF BIRDS IN PIEDMONT DAGESTAN

2019 ◽  
Vol 14 (2) ◽  
pp. 9-34
Author(s):  
E. V. Vilkov
Keyword(s):  
Genetic Structure ◽  
Migratory Birds ◽  
Standard Procedure ◽  
Bird Species ◽  
Quantitative Composition ◽  
Bird Populations ◽  
Structural Graph ◽  
Suitable Habitats ◽  
First Time ◽  
Ecological Pattern

Aim. The paper summarizes the data on bird counts carried out in 1995–2018 in Piedmont Dagestan. Information on the following points was obtained for the first time: composition of bird species, their average abundance, residence status, faunal‐genetic structure, ecological pattern of the avifauna, as well as the features of territorial distribution of birds in Piedmont Dagestan.Methods. Bird counts were carried out on routes without limiting the transect width, with further separate recalculation per area according to the average detection ranges for groups. The faunal‐genetic structure was determined using a standard procedure. The ecological classification is based on the original differentiation of birds according to their occurrence in preferred habitats. The obtained data were processed using cluster, factor and correlation analyses.Results. Of 127 bird species recorded in Piedmont Dagestan, widespread representatives of European, European‐Chinese, Mediterranean, as well as Mongolian fauna predominate, which is associated with the availability of suitable habitats. In the course of cluster analysis, we identified three groups of key areas, reflecting the abundance‐based similarities between bird populations in the studied area. The constructed structural graph illustrates the spatial‐typological organization of the bird population in Piedmont Dagestan. It is established that the development of bird communities in the compared key areas has not only a similar but also distinctive ecological pattern, formed under the influence of such environmental factors as high‐altitude gradient, availability of warmth and water, forest area, rocky outcrops, as well as open areas and man‐made landscapes.Conclusion. The specific ecological pattern of the avifauna in Piedmont Dagestan was developed due to the contribution of both adapted populations of migratory birds of the plains, nesting in the foothills, and to that of the resident communities of typically mountain birds, whose qualitative and quantitative composition changes under the integrated influence of environmental regulatory factors.   

Drivers of population change in common farmland birds in Germany

2020 ◽  
Vol 30 (3) ◽  
pp. 335-354 ◽  
Author(s):  
MALTE BUSCH ◽  
JAKOB KATZENBERGER ◽  
SVEN TRAUTMANN ◽  
BETTINA GERLACH ◽  
RAINER DRÖSCHMEISTER ◽  
...  
Keyword(s):  
Breeding Season ◽  
Population Change ◽  
Bird Species ◽  
Weather Conditions ◽  
Population Trends ◽  
Mixed Effect ◽  
Bird Population ◽  
Bird Populations ◽  
Positive Effects ◽  
Farmland Bird

SummaryFarmland bird populations in Germany are declining at a higher speed than species inhabiting other habitats. We studied potential causes for bird population changes based on data from standardised German breeding bird monitoring schemes. We related population trends to covariates describing the changes in the agricultural landscape in Germany, weather conditions during the breeding season and for some migratory species, conditions at stopover and wintering sites. Linear mixed effect models were used to analyse effect strength at species level and conclusions are drawn for the overall group of farmland bird species. The area of grassland and fallow land was shown to have the strongest positive effects and the area of maize and rapeseed the strongest negative effects on farmland bird population trends. The results obtained also indicate that despite the consistent influence of weather conditions during the breeding season, land-use changes had a stronger impact on bird populations than weather. Conditions at Sahel wintering sites did not show a consistent effect on population trends. Based on these findings the study quantitatively underpins and ranks key factors shaping farmland bird populations in Germany.

scholarly journals Quantifying Effects of Spatial Heterogeneity of Farmlands on Bird Species Richness by Means of Similarity Index Pairwise

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Federico Morelli
Keyword(s):  
Species Richness ◽  
Spatial Heterogeneity ◽  
Central Italy ◽  
Bird Species ◽  
Similarity Index ◽  
Bird Communities ◽  
Bird Species Richness ◽  
Bird Richness ◽  
Farmland Bird ◽  
The Impact

Many studies have shown how intensification of farming is the main cause of loss biodiversity in these environments. During the last decades, agroecosystems in Europe have changed drastically, mainly due to mechanization of agriculture. In this work, species richness in bird communities was examined on a gradient of spatial heterogeneity of farmlands, in order to quantify its effects. Four categories of farmland spatial heterogeneity were defined, based on landscape and landuse parameters. The impact of features increasing the spatial heterogeneity was quantified comparing the similarity indexes between bird communities in several farmlands of Central Italy. The effects of environmental variables on bird richness were analyzed using GLM. The results highlighted that landscape features surrogates of high nature values (HNVs) of farmlands can increase more than 50% the bird species richness. The features more related to bird richness were hedgerows, scattered shrubs, uncultivated patches, and powerlines. The results confirm that the approach based on HNV for evaluating the farmlands is also suitable in order to study birds’ diversity. However, some species are more sensitive to heterogeneity, while other species occupy mainly homogeneous farmlands. As a consequence, different conservation methods must be considered for each farmland bird species.

scholarly journals Poor evidence-base for assessment of windfarm impacts on birds

2007 ◽  
Vol 34 (1) ◽  
pp. 1-11 ◽  
Author(s):  
GAVIN B. STEWART ◽  
ANDREW S. PULLIN ◽  
CHRISTOPHER F. COLES
Keyword(s):  
Climate Change ◽  
Negative Impact ◽  
Renewable Energy Sources ◽  
Habitat Type ◽  
Bird Species ◽  
Evidence Base ◽  
Systematic Review Methodology ◽  
Bird Abundance ◽  
Bird Populations ◽  
The Impact

Concerns about anthropogenic climate change have resulted in promotion of renewable energy sources, especially wind energy. A concern raised against widespread windfarm development is that it may negatively impact bird populations as a result of bird collision with turbines, habitat loss and disturbance. Using systematic review methodology bird abundance data were synthesized from 19 globally-distributed windfarms using meta-analysis. The effects of bird taxon, turbine number, power, location, latitude, habitat type, size of area, time since operation, migratory status of the species and quality of evidence were analysed using meta-regression. Although the synthesized data suggest a significant negative impact of windfarms on bird abundance, there is considerable variation in the impact of individual windfarm sites on individual bird species, and it is unclear if the negative impact is a decline in population abundance or a decline in use owing to avoidance. Anseriformes experienced greater declines in abundance than other taxa, followed by Charadriiformes, Falconiformes and Accipitriformes, and Passeriformes. Time since windfarms commenced operation also had a significant impact on bird abundance, with longer operating times resulting in greater declines in abundance than short operating times. Other variables, including turbine number and turbine power either had very weak but statistically significant effects or did not have a significant effect on bird abundance. Windfarms may have significant biological impacts, especially over longer time scales, but the evidence-base is poor, with many studies being methodologically weak, and more long-term impact assessments are required. There is clear evidence that Anseriformes (wildfowl) and Charadriiformes (waders) experience declines in abundance, suggesting that a precautionary approach should be adopted to windfarm development near aggregations of these taxa in offshore and coastal locations. The impact of windfarm developments on bird populations must also be viewed in the context of the possible impact of climate change in the absence of windfarms.

scholarly journals Weak Effects of Owned Outdoor Cat Density on Urban Bird Richness and Abundance

Land ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 507
Author(s):  
Genevieve C. Perkins ◽  
Amanda E. Martin ◽  
Adam C. Smith ◽  
Lenore Fahrig
Keyword(s):  
Urban Areas ◽  
Bird Species ◽  
Lethal Effect ◽  
Bird Communities ◽  
Domestic Cats ◽  
Urban Birds ◽  
Negative Effects ◽  
Bird Populations ◽  
Bird Richness ◽  
Urban Bird

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 likely observe one additional bird species, and 0.003 additional individuals per species, if policies/programs reduced owned outdoor cat densities to zero in an average landscape in Ottawa (with 130.2 cats/km2). However, these effects of cat density on birds were uncertain, with 95% confidence intervals crossing zero. Our findings—in combination with those of previous studies—suggest a need for research to resolve the apparent disconnect between the strong, negative effects of cats on individual urban birds and the weak, uncertain effects of cats on bird populations. Although measures that reduce owned outdoor cat densities are justified based on the precautionary principle, evidence to date does not support prioritizing these measures over those addressing threats that have consistently strong effects on bird populations.

Sign in / Sign up

Export Citation Format

Share Document