The breeding bird community of managed and unmanaged willow scrub at Leighton Moss, Lancashire

1992 ◽  
Vol 98 ◽  
pp. 207-213 ◽  
Author(s):  
John Wilson
Keyword(s):  
Vegetation Cover ◽  
Bird Community ◽  
Breeding Birds ◽  
Herb Layer ◽  
Breeding Bird ◽  
Woodland Birds ◽  
Feeding Sites

SynopsisCoppiced willow supports a much higher density of breeding birds than unmanaged more mature willow. This appears to be because it retains richer vegetation cover, especially in the herb layer, and so provides more breeding and feeding sites for both marsh and woodland birds.

scholarly journals Changes in Species Composition of Birds and Declining Number of Breeding Territories over 40 Years in a Nature Conservation Area in Southwest Germany

Diversity ◽  
2018 ◽  
Vol 10 (3) ◽  
pp. 97 ◽  
Author(s):  
Fabian Schrauth ◽  
Michael Wink
Keyword(s):  
Nature Conservation ◽  
Bird Community ◽  
Breeding Birds ◽  
Trophic Levels ◽  
Breeding Period ◽  
Insectivorous Birds ◽  
Breeding Bird ◽  
Conservation Area ◽  
Insect Populations ◽  
Southwest Germany

Global loss of biodiversity is occurring at an alarming rate and is a major issue in current times. Long-term studies offer the possibility to analyse changes in biodiversity and allow assessments of anthropogenic interventions in ecosystems. At present, various studies in most countries show partially strong declines of insect populations. Due to their role as a food source for many organisms it is assumed that declines of insect abundance might have effects on higher trophic levels like insectivorous birds. For reliable statements on relationships between food availability and population trends, systematic and extensive records of breeding birds are necessary. In this study, we analysed the changes in the range of species, biodiversity, and abundance of a breeding bird community over 43 years in a large nature conservation area in southwest Germany (“Lampertheimer Altrhein” near Mannheim). Since 1974, considerable changes in the spectrum of breeding birds have been found, but the overall biodiversity index did not change. Furthermore, 70% of the investigated species showed decreasing numbers of breeding bird territories, and the overall number of territories across species declined by more than 65%. A classification based on the main diet during the breeding period and habitat use revealed strong declines for insectivorous birds in the study area, especially in wetland and open cultivated landscapes.

scholarly journals Population density and structure of a breeding bird community in a suburban habitat in the Cuvelai drainage system, northern Namibia

2021 ◽  
pp. 313-320
Author(s):  
G. Kopij
Keyword(s):  
Diversity Index ◽  
Drainage System ◽  
Bird Species ◽  
Passer Domesticus ◽  
Bird Community ◽  
Breeding Birds ◽  
Population Densities ◽  
Feeding Guild ◽  
Breeding Bird ◽  
Shannon’S Diversity Index

In a suburb (c. 100 ha) of Ongwediva, a total of 30 breeding bird species were recorded in 2018. Shannon’s Diversity Index was 2.01. Passer domesticus comprised almost half of all breeding pairs (36.4 pairs / 10 ha). Granivores were by far the most numerous feeding guild, comprising 77.5 % of all birds breeding. Birds nesting on/in buildings were represented by two species only, but they comprised almost half (49.9 %) of all breeding birds. In comparison with other southern African towns, the number of bird species breeding in Ongwediva was low. This was compensated by high population densities of some species.

scholarly journals The Effect of Pyrogenic Successionon Breeding Birds of Shelter Belts in the North-Western Part of the Azov Sea Region

2019 ◽  
Vol 53 (2) ◽  
pp. 149-154
Author(s):  
E. M. Ayubova ◽  
V. A. Koshelev
Keyword(s):  
Bird Community ◽  
Breeding Birds ◽  
Breeding Bird ◽  
The North ◽  
Azov Sea ◽  
Corvus Frugilegus ◽  
Shelter Belts ◽  
Dominating Tree ◽  
Quantitative Changes ◽  
North Western

Abstract The effect of the pyrogenic factor on the avifauna of shelter belts in the north-western part of the Azov Sea region, Ukraine is considered basing on results of the research carried out in 2001–2018. The breeding bird community of shelter belts is composed of 50 species, of them different types of shelter belts support 14–46 species. Changes in the species composition of breeding birds are analysed in subsequent years aft er the fires. The recovery of bird communities is progressing at a slow pace following the regeneration of tree-shrub vegetation and development of consortial relations of birds with dominating tree-shrub species and rook (Corvus frugilegus) colonies. It is established that the vegetation pyrogenic succession is accompanied by deep qualitative and quantitative changes in the structure of breeding avian communities in shelter belts of different type.

Evaluating Riparian Restoration Success: Long-Term Responses of the Breeding Bird Community in California’s Lower Putah Creek Watershed

2018 ◽  
Vol 36 (1) ◽  
pp. 76-85 ◽  
Author(s):  
Kristen E. Dybala ◽  
Andrew Engilis ◽  
John A. Trochet ◽  
Irene E. Engilis ◽  
Melanie L. Truan
Keyword(s):  
Bird Community ◽  
Riparian Restoration ◽  
Breeding Bird ◽  
Restoration Success ◽  
Creek Watershed ◽  
Putah Creek

scholarly journals Understanding testosterone variation in a tropical lek-breeding bird

2011 ◽  
Vol 7 (4) ◽  
pp. 506-509 ◽  
Author(s):  
Thomas B. Ryder ◽  
Brent M. Horton ◽  
Ignacio T. Moore
Keyword(s):  
Social Status ◽  
Strong Predictor ◽  
Breeding Birds ◽  
Male Dominance ◽  
Surprising Result ◽  
Breeding Bird ◽  
Dominance Hierarchies ◽  
Testosterone Levels ◽  
Male Display ◽  
Pipra Filicauda

Male reproductive coalitions, in which males cooperate to attract females, are a rare strategy among vertebrates. While some studies have investigated ultimate aspects of these relationships, little is known about the mechanistic role that hormones play in modulating cooperative behaviours. Here, we examined male testosterone variation in a tropical lekking bird, the wire-tailed manakin ( Pipra filicauda ), which exhibits cooperative male–male display coalitions. We found that testosterone levels in territorial males were comparable to those of temperate breeding birds, a surprising result given their environmental, social and reproductive dynamics. In addition, social status rather than plumage was a strong predictor of testosterone variation. Territorial males had significantly higher testosterone levels than did two other plumage classes of floater males, who do not hold territories. We hypothesize that testosterone variation plays an important role in the establishment of male dominance hierarchies (competition), while concurrently facilitating stable display partnerships (cooperation).

scholarly journals Avian Haemosporidian Diversity on Sardinia: A First General Assessment for the Insular Mediterranean

Diversity ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 75
Author(s):  
Irene Pellegrino ◽  
Luca Ilahiane ◽  
Giovanni Boano ◽  
Marco Cucco ◽  
Marco Pavia ◽  
...  
Keyword(s):  
Linear Models ◽  
Parasite Community ◽  
Breeding Birds ◽  
Lower Probability ◽  
Long Distance ◽  
Breeding Bird ◽  
Bird Populations ◽  
Total Prevalence ◽  
Western Palearctic ◽  
Host Parasite

The Western Palearctic is one of the most investigated regions for avian haemosporidian parasites (Haemoproteus, Plasmodium and Leucocytozoon), yet geographic gaps in our regional knowledge remain. Here, we report the first haemosporidian screening of the breeding birds from Sardinia (the second-largest Mediterranean Island and a biodiversity hotspot), and the first for the insular Mediterranean in general. We examined the occurrence of haemosporidians by amplifying their mtDNA cytb gene in 217 breeding birds, belonging to 32 species. The total prevalence of infected birds was 55.3%, and of the 116 haplotypes recovered, 84 were novel. Despite the high number of novel lineages, phylogenetic analysis did not highlight Sardinia-specific clades; instead, some Sardinian lineages were more closely related to lineages previously recovered from continental Europe. Host-parasite network analysis indicated a specialized host-parasite community. Binomial generalized linear models (GLMs), performed at the community level, suggested an elevational effect on haemosporidian occurrence probability (negative for Haemoproteus; positive for Leucocytozoon) likely due to differences in the abundance of insect vectors at different elevations. Furthermore, a GLM revealed that sedentary birds showed a higher probability of being infected by novel haplotypes and long-distance migrants showed a lower probability of novel haplotype infection. We hypothesize that the high diversity of haemosporidians is linked to the isolation of breeding bird populations on Sardinia. This study adds to the growing knowledge on haemosporidians lineage diversity and distribution in insular environments and presents new insights on potential host-parasite associations.

scholarly journals Riparian Bird Community Structure in Portland, Oregon: Habitat, Urbanization, and Spatial Scale Patterns

The Condor ◽  
2003 ◽  
Vol 105 (2) ◽  
pp. 288-302 ◽  
Author(s):  
Lori A. Hennings ◽  
W. Daniel Edge
Keyword(s):  
Native Species ◽  
Forest Canopy ◽  
Urban Canopy ◽  
Canopy Cover ◽  
Bird Community ◽  
Metropolitan Region ◽  
Road Density ◽  
Breeding Bird ◽  
Bird Abundance ◽  
Neotropical Migrant

Abstract In 1999, we surveyed breeding bird and plant communities along 54 streams in the Portland, Oregon, metropolitan region to link bird community metrics with structural and spatial characteristics of urban riparian areas. Canonical correspondence analysis produced two explanatory axes relating to vegetation and road density. Total and non-native bird abundance was higher in narrow forests. Native bird abundance was greater in narrow forests surrounded by undeveloped lands; native species richness and diversity were greater in less-developed areas. Native resident and short-distance-migrant abundance was higher in narrow forests, and diversity was positively associated with developed lands. Neotropical migrant abundance, richness, and diversity were greater in open-canopied areas with fewer roads. We examined spatial relationships by regressing bird variables on satellite-derived forest canopy cover, area of undeveloped lands, and street density in a series of 50-m buffers within a 500-m radius around study sites. Non-native bird abundance decreased with increasing canopy cover within 450 m, but most other relationships were strongest at smaller scales (50–100 m). Our results suggest that increasing urban canopy cover is the most valuable land management action for conserving native breeding birds. A hierarchical scheme for Neotropical migrant conservation might include increasing forest canopy within 450 m of streams to control non-native species and cowbirds; reducing street density within a 100-m radius of streams; and conserving or planting onsite native trees and shrubs. Estructura de Comunidades Riparias de Aves en Portland, Oregon: Hábitat, Urbanización y Patrones de Escala Espacial Resumen. Censamos las comunidades de aves reproductivas y plantas a lo largo de 54 arroyos en el área metropolitana de Portland, Oregon en 1999 para conectar medidas de comunidades de aves con características estructurales y espaciales de zonas riparias urbanas. Análisis de correspondencia canónica produjeron dos ejes explicativos relacionados con la vegetación y la densidad de carreteras. La abundancia total de aves y la de aves no nativas fueron mayores en bosques estrechos. La abundancia de aves nativas fue mayor en bosques estrechos rodeados por terrenos rurales y la riqueza y diversidad de especies fueron mayores en áreas menos desarrolladas. La abundancia de residentes nativas y migratorias de corta distancia fue mayor en bosques estrechos y su diversidad estuvo asociada positivamente con terrenos desarrollados. La abundancia, riqueza y diversidad de las migratorias neotropicales fueron mayores en áreas de dosel abierto y con pocas carreteras. Examinamos las relaciones espaciales mediante regresiones entre variables de aves y la cobertura del dosel derivada de imágenes satelitales, el área de terrenos sin desarrollar y la densidad de calles en una serie de áreas de 50 m de ancho en un radio de 500 m alrededor de los sitios de estudio. La abundancia de aves no nativas disminuyó con aumentos en la cobertura del dosel hasta 450 m, pero la mayoría de las demás relaciones fueron más fuertes a escalas menores (50–100 m). Nuestros resultados sugieren que el incremento de la cobertura del dosel en áreas urbanas es la estrategia de manejo más valiosa para conservar las aves nativas que se reproducen en el área. Un esquema jerárquico para la conservación de las migratorias neotropicales podría incluir aumentar la cobertura de bosque a menos de 450 m de los arroyos para controlar a las especies no nativas y a los Molothrus, reducir la densidad de calles dentro de un radio de 100 m alrededor de los arroyos y conservar o plantar árboles y arbustos nativos.

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