Bird Species Abundance Research Articles

Bird Communities in a Changing World: The Role of Interspecific Competition

Significant changes in the environment have the potential to affect bird species abundance and distribution, both directly, through a modification of the landscape, habitats, and climate, and indirectly, through a modification of biotic interactions such as competitive interactions. Predicting and mitigating the consequences of global change thus requires not only a sound understanding of the role played by biotic interactions in current ecosystems, but also the recognition and study of the complex and intricate effects that result from the perturbation of these ecosystems. In this review, we emphasize the role of interspecific competition in bird communities by focusing on three main predictions derived from theoretical and empirical considerations. We provide numerous examples of population decline and displacement that appeared to be, at least in part, driven by competition, and were amplified by environmental changes associated with human activities. Beyond a shift in relative species abundance, we show that interspecific competition may have a negative impact on species richness, ecosystem services, and endangered species. Despite these findings, we argue that, in general, the role played by interspecific competition in current communities remains poorly understood due to methodological issues and the complexity of natural communities. Predicting the consequences of global change in these communities is further complicated by uncertainty regarding future environmental conditions and the speed and efficacy of plastic and evolutionary responses to fast-changing environments. Possible directions of future research are highlighted.

Considering passenger pigeon abundance and distribution in the Late Woodland zooarchaeological record of southern Ontario, Canada

AbstractThe passenger pigeon (Ectopistes migratorius) was once the most abundant bird species in North America. Flocks of these birds witnessed in the early 19th century were so vast that they were said to darken the sky for days as they passed. Early syntheses of passenger pigeon remains in archaeological contexts in the eastern United States, in contrast, found them to be relatively rare in relation to other fowl, leading to the suggestion that the colonial‐era hyper‐abundance of passenger pigeons was a post‐European‐contact phenomenon resulting from contact‐induced demographic and ecological changes. In this paper, we provide new insights into passenger pigeon historical ecology through a synthesis and GIS‐based analysis of zooarchaeological data on skeletal remains from 157 Late Woodland (ca. 900–1650 CE) sites in Ontario, Canada. Our results reveal that passenger pigeon bones are common, and often abundant, in Late Woodland archaeological assemblages in Ontario, which speaks to the species' importance to Indigenous peoples in the region. However, the relative abundance of passenger pigeon remains varies over time, suggesting longer‐term trends in their availability and/or in hunting patterns.

No place for ground-dwellers in cities: A meta-analysis on bird functional traits

Urbanization is one of the most severe forms of environmental alteration, in which increasing human settlement leads to an unprecedented loss of natural areas, thereby threatening global biodiversity and associated ecosystem functions. Consequently, the evidence base needs to be strengthened in order to understand how this man-made alteration affects urban biodiversity, and hence develop appropriate conservation measures. According to our expectations, urbanization processes influence the abundance of passerine birds through functional traits, what we studied within the framework of a systematic review using phylogenetically controlled meta-analyses. We tested four specific predictions: (i) Migration strategy will influence responses to urbanization, and tropical migrants will be the least numerous in urban areas; (ii) Birds nesting at ground level will be negatively affected by urbanization, while birds nesting at higher levels will suffer less; (iii) In terms of foraging technique, ground probers will be negatively; and (iv) birds with insectivorous diet will be the most disadvantaged in cities. Bird species (N = 53) were studied along urbanization gradients that ranged from highly urbanized areas to adjacent natural areas. Our findings revealed that the impact of urbanization on the abundance of bird species is modulated by certain functional traits. Partial or short distance migrants, ground nesters, ground gleaners and granivores were the group of species most negatively influenced by urbanization. Species sensitive to urbanization were those that are linked in some way to open grassland areas. This indicates that cities need more intact and extensively managed grasslands to sustain bird communities, which provide valuable ecosystem services.

How the color of reflective materials influences the occurrence of mammals and birds

Color reflective materials have been widely employed in agriculture, airports, and road traffic as signals and to prevent the damage caused by mammals and birds. The negative impacts of such applications on wildlife have been acknowledged, but little is known about the particular effects of different colors applied to these materials. We recorded the occurrence of wildlife using 56 camera traps placed in locations affected by different reflective color sheeting (red, yellow, green, blue, white, mirror and control without disturbance) in a subtropical montane forest of southwestern China. We compared richness and abundance of ground bird and mammal species. The results showed that the yellow reflective material has an attractive effect on birds during daytime compared with the control group, while the red and green ones appear to repel them. However, the general tendency was a reduction of bird species occurring at night because of all the different sources of reflective light. For mammals, no significant difference was found among disturbances during either day or night. Species showed different responses to specific colors but further research in this regard is needed. Based on these experimental findings, we recommend that all reflective materials should be avoided or used carefully within protected areas. Moreover, red and green signals are suitable for airports and agriculture fields to effectively prevent damage and safety concerns inflicted by birds. Biodiversity, Conservation biology, Environmental contamination and remediation, Environmental impacts, Population biology

Monetary evaluation of supporting ecosystem services as a habitat provider for birds in Thailand urban park

Abstract. Yarnvudhi A, Leksungnoen N, Siri S, Ponpithuk Y, Sukmasuang R, Duengkae P, Pongcharoen C, Sutummawong N, Marod D, Wachrinrat C, Premashthira A, Tor-ngern P, Poungcharean S, Hermuk S, Kachina P. 2022. Monetary evaluation of supporting ecosystem services as a habitat provider for birds in Thailand urban park. Biodiversitas 23: 4747-4758. Supporting services are important services to maintain ecosystems by providing habitats for organisms and genetic diversity. In this study, the monetary value of supporting services for bird habitats in urban parks was evaluated based on the price for nursing each bird species and market value. Bird diversity was conducted using point count observation. We found total of 53 bird species, 27 families and 8 orders in the park. Total monetary benefit for bird habitats in this park was estimated to be around USD60,354.12 per individual bird with an average value of USD1,138.76 per bird per species. The top three species with the highest monetary value were the Painted Stork (Mycteria leucocephala), Asian Openbill (Anastomus oscitans), and Chinese Pond Heron (Ardeola bacchus). The species diversity index of the bird community (H') was 2.73 and the most abundant bird species were Eastern Spotted Dove (Spilopelia chinensis), Eurasian tree sparrow (Passer montanus), Eastern jungle crow (Corvus levaillantii), Oriental magpie robin (Copsychus saularis), and Coppersmith Barbet (Psilopogon haemacephalus). Among 4 microhabitats, birds were found the most in the trees, followed by lawn, grassland, and wetland areas. The small urban parks should be designed with diverse microhabitats to provide various ecological functions to attract and ensure adequate resources for organisms.

Relationship between Vegetation Habitats and Bird Communities in Urban Mountain Parks.

Simple SummaryThe complexity of urban green space vegetation is an extremely vital influential factor and predictor of biodiversity, and vegetation habitat factors have been shown to explain more variation in bird diversity than other environmental factors. In this study, we explored the characteristics and differences in bird diversity among vegetation habitats in five typical urban mountain parks in coastal areas of southeast China. Our study showed that: (1) Sparse forest supports more bird species and higher bird diversity. (2) Tree diversity significantly affects bird diversity in urban mountain parks. (3) The average subbranch height of trees has a significant effect on the evenness of birds. (4) The number of tourists and predators has little impact on bird diversity. This study could provide suggestions for the rational allocation of vegetation in urban mountain parks in southeast coastal areas to improve local ecological service functions as habitats for urban wildlife, especially wild birds.The coastal areas of southeast China have typical high-density urbanization characteristics, and urban mountain parks are important green spaces in these urban green space systems. Our study was conducted in five typical urban mountain parks in Fuzhou, China. The bird survey was carried out in 25 transects of different vegetation habitats for 10 months, and the vegetation survey was conducted in 25 habitats to investigate the characteristics of bird communities in different vegetation habitats and the causes of their differences. The results showed: (1) From 1 October 2021 to 15 July 2022, we recorded a total of 90 bird species in 8 orders, 37 families, and 64 genera, with 1879 individuals in five vegetation habitats in the urban mountain parks. (2) Abundance and diversity of trees are vegetation variables affecting bird diversity (bird species richness, abundance, and Shannon diversity) in urban mountain parks, and the average branch height under trees has a significant effect on bird evenness. (3) We found more bird species and higher bird diversity in both sparse and dense forest habitats, but fewer bird species in waterfront, shrub, and grassland habitats; (4) Average tree height (AVE_HEIt) was only present in the best model of bird abundance and evenness. However, none of the best models found a significant effect of the number of tourists and predators on bird diversity. Our results could provide a theoretical basis and guidance for the future improvement of ecological service functions of bird habitats in urban mountain parks in subtropical coastal areas.

Coastal bird community response to dredge‐spoil tidal marsh restoration at New Round Island, Mississippi, U.S.A.

The northern Gulf of Mexico has been the focus of many coastal habitat restoration projects in the wake of new funding streams stemming from the settlement of the 2010 Deepwater Horizon oil spill litigation. One such project was the creation of New Round Island (RNDI) in Mississippi, a 86 ha island created using dredge material in 2017. The island design incorporated a novel U‐shaped sand berm with multiple interconnected containment sells. In this study we sought to document changes in relative abundance of various coastal bird species. We conducted surveys for breeding and nonbreeding birds from June 2017 to May 2021, and we conducted nonbreeding surveys at two reference sites for comparison. Breeding bird numbers were dominated by colonial nesting species in years 1 and 2, which subsequently declined as vegetation cover increased. Solitary nesting species increased over time, with Wilson's Plover (Charadrius wilsonia) nest count increasing from zero in year 1 to 29 in year 5. Nonbreeding shorebird counts peaked in years 1–2 and subsequently declined, although shorebird counts also decreased at the reference sites. Relative abundance of waders (Ardeidae), rallids (Rallidae), and passerines (Passeriformes and allies) increased in comparison to reference sites. This study demonstrates the short‐term benefits of this U‐shaped island design to early‐succession breeding species and nonbreeding shorebirds shortly after construction, with longer‐term benefits to breeding Wilson's Plover and to marsh birds as vegetation fills in.

Responses of birds to vineyard abandonment in Slovakia

Vineyards are semi-natural, human-modified ecosystems where the extent of natural elements is determined primarily by the type of management and by the abandonment rate. In this study, we analyzed bird assemblages in 40 vineyard plots in six wine-growing regions of Slovakia. We examined bird communities on managed and abandoned vineyards to identify possible patterns. Environmental and spatial predictors of species richness and abundance were analyzed using partial redundancy analysis (pRDA) and a generalized additive model (GAM). Bird communities were influenced by both environmental and spatial factors. As expected, elevation explained most of the variation in bird assemblages. Tree coverage was found to be more important than the vineyard abandonment rate in explaining the observed variability. Only a portion of the variance in the species data reported by pRDA was accounted for by the difference in vineyard abandonment degree. Our results show that the species richness of all birds was positively correlated to vegetation density (captured by NDVI). Herb and shrub cover had less effect on bird species richness than tree cover and the presence of traditional agricultural vineyard landscapes. However, shrub density emerged as a key explanatory factor for the abundance of habitat specialists. Our study shows that, depending on whether the goal is to promote the diversity and abundance of farmland or non-farmland bird species, different conservation biology approaches should be used. Increasing the landscape diversity and avoiding large vineyard abandonment are necessary if we are to stem the decline of valuable farmland species. • The area of managed vineyards in Slovakia continues to decrease. • The species richness of all birds positively correlated to NDVI. • Tree coverage was found to be one of the most important factors in explaining bird species variation. • The shrub density turned out to be a key explanatory factor of habitat specialist abundance. • Bird abundance and species richness increased continuously with the presence of the traditional agricultural landscape.

Avian Use of Habitat Patches Dominated by Exotic Leucaena leucocephala or Native Tree Species in Urban Dar es Salaam, Tanzania

There has been an incursion of an exotic Leucaena leucocephala in disturbed areas and into habitat patches of native tree species in some areas in Tanzania. However, the impacts of this exotic tree on native biodiversity are not well understood. We assessed bird use of habitat patches dominated by L. leucocephala in comparison to patches of native tree species at the University of Dar es Salaam main campus, Tanzania, by comparing bird species richness, abundance and diversity using mist netting. Based on the same mist netting efforts in each habitat patch type, patches of native trees had significantly higher overall diversity (t = 1.999, df = 293.64, p < 0.05) and abundance (χ2 = 40.525, df = 1, p < 0.001) of birds than those dominated by the exotic L. leucocephala and significantly greater abundance of forest-dependent species (χ2 = 10.938, df = 1, p < 0.001) and forest visitors (χ2 = 15.258, df = 1, p < 0.001). The similarity in bird species between the two habitats was 0.658 indicating that many bird species occurred in both habitat types. The lower diversity and overall abundance of birds in the patches dominated by the exotic plant suggest that it does not provide appropriate habitat for many bird species, and further spread of this exotic will be detrimental to the local avifauna.
 Keywords: Birds, diversity, native tree species, exotic tree species, Leucaena leucocephala.

The Feeding Behavior of Wild-birds on Waste Dumps: A Potential Pathogenic Threat to the Human Population in the Campus of Yaoundé University I, Centre Region, Cameroon

In most African countries including Cameroon, avian study, conservation and protection efforts are mainly focused on protected areas such as national parks. But, exploration and conservation of birds in urban areas particularly in waste disposal sites are neglected. Hence, the objective of this study was to assess wild-bird feeding activity on waste dumps in the campus of Yaounde University I. The research area was divided into four zones, north, south, east, and west zone. Four dumpsites were randomly selected from each zone and were visited twice a week for research data collection. On the dumps, observations were done from 7:00am – 6:00pm, and foraging activities of all the bird species observed were recorded on data sheets during the period. More so, the ecological conditions like the atmospheric changes, photo-period, weight estimate of dumps, proximity of dump to residential homes, major dump materials were recorded simultaneously. The study revealed a significance on bird species and dumpsite location X 2 = 14.485 df=9, P<0.05. Grey-headed sparrow ( Passer griseus ) 48% was the most abundant bird species on the dumpsites compared to village weaver ( Ploceus cucullatus ) 32%, little weaver-bird ( Ploceus luteolus ) 16%, and pied crow 4% respectively. The feeding rate of the birds showed a significance on atmospheric conditions X 2 = 82.674 df=4, P=0.000. Amongst these three activities rates, normal 41% was the most recorded compared to low 38%, and high 21% respectively. The cloudy atmospheric condition 3% almost halted feeding activity of the birds at the dumpsites compared to windy 72%, and sunny 25% respectively. Moreover, a significance was revealed by dump-weight and feeding rate X 2 =22.617 df=4, P=0.000. Though all the dumpsites received feeding and foraging activity of birds, 1-tonne dumps had the highest waste materials 45% while 2-tonne, and 3-tonne dumps had the least 31% and 24% respectively. Dump proximity to buildings and feeding rate were also significant X 2 = 27.640 df=6, P=0.000. Additionally, a significance was recorded between day-period and feeding rate X 2 = 83.271 df=4, P=0.000. This study observed high feeding and foraging rate during the morning period of the day 40% compared to afternoon and evening with 26% and 34% respectively. Solid dumps are rich in rodents, birds, reptiles, insects, domestic animals like cats, dogs, and pigs. These animals very much depend on these dump-subsidized-food source for their livelihood. Unfortunately, they could vector diseases like malaria, typhoid, and cholera, amongst many others into the human society. Though, waste management is given a little attention in the country, inability for waste segregation at dumpsites, together with cycling gaps has rather fuelled health problems to some people living some school campuses and cities. More waste management budget and training is needed if human-health improvement is expected in the country Keywords: University, Waste materials, Bird species, Dump location, Ecological conditions DOI: 10.7176/JBAH/12-11-02 Publication date: June 30 th 2022

The building size effect on bird community assemblages in tropical urban ecosystem

Abstract. Utama AA, Nurvianto S. 2022. The building size effect on bird community assemblages in tropical urban ecosystem. Biodiversitas 23: 2775-2782. The construction of buildings is one of the factors that cause landscape changes in urban areas. Landscape changes can result in the fragmentation of animal habitats that live in urban areas. Characteristics of urban structures, such as spatial configuration and distribution of building types, are some of the factors that influence the distribution pattern and abundance of bird species in urban areas. This research aimed to describe the effect of building type on the diversity of bird species in Province of Yogyakarta, Indonesia, or Daerah Istimewa Yogyakarta (DIY). Bird data were recorded using the point count method, while building type data and vegetation height were obtained by subtracting Digital Surface Model (DSM) data and Digital Elevation Model (DEM) data in the built-up area. The data was recorded from three levels of urbanization, namely urban, suburban and rural. Canonical Correspondence Analysis (CCA) was used to visualize the response of birds to the type of building. After that, the Generalized Linear Model (GLM) was used to determine the effect of the type of building on the diversity of bird species. The results showed that shrub cover affected species richness and abundance of birds. The building types with a height below 18 meters had a negative effect on the abundance and diversity of birds in suburban areas. The abundance of birds in urban areas was positively affected by the type of building with a height of between 18 and 30 meters. The existence of buildings in urban areas can reduce bird feed sources. Making spatial plans that provide more variety of plant cover and diversity of building heights are expected to increase bird diversity in urban areas.

Overwintering in a megacity: Urban green areas and migratory birds in Mexico City

Nearctic-Neotropical migratory birds are threatened by land-use change throughout their complex annual cycles. While urbanization is an essential driver of land-use change, it is unclear how it affects migrant birds. Although migratory birds are more diverse in non-urban patches of native vegetation than in urban areas, neotropical cities can host diverse assemblages of overwintering migrant birds. Migratory birds in neotropical cities tend to be closely associated with urban green areas (UGAs). However, how their presence and abundance are affected by the habitat elements of UGAs and the urban matrix of neotropical cities is poorly understood. In this study, we compared the migratory bird species richness and abundances among UGAs and the urban matrix of the southern section of the megacity of Mexico City and native vegetation sites outside the city. Our results show that UGAs in neotropical cities provide habitats capable of maintaining complex overwintering migratory bird assemblages with local trees as critical features. We also assess the role that UGAs' characteristics play in determining migrant bird assemblages. We conducted bird censuses and measured habitat traits to determine how migrant bird assemblages are related to the habitat features of our study sites. We measured local, buffer, and spatial habitat features of each UGA. We found 23 overwintering migrant species in the three habitats, with 22 present within UGAs. Both UGAs and urban matrix sites had higher estimated species richness of migrant birds than non-urban native vegetation sites located outside the city. Only local features of UGAs affected migrant birds. While tree abundance in UGAs was positively associated with migratory bird species richness, the proportion of tree coverage was positively related to bird abundance. Our results show that UGAs in neotropical cities can maintain complex overwintering migratory bird assemblages, with trees being the most critical habitat feature. As a result, UGA management focused on maintaining trees and increasing their numbers can improve habitat conditions for migratory birds overwintering in neotropical cities.

State of the World's Birds

We present an overview of the global spatiotemporal distribution of avian biodiversity, changes in our knowledge of that biodiversity, and the extent to which it is imperilled. Birds are probably the most completely inventoried large taxonomic class of organisms, permitting a uniquely detailed understanding of how the Anthropocene has shaped their distributions and conservation status in space and time. We summarize the threats driving changes in bird species richness and abundance, highlighting the increasingly synergistic interactions between threats such as habitat loss, climate change, and overexploitation. Many metrics of avian biodiversity are exhibiting globally consistent negative trends, with the International Union for Conservation of Nature's Red List Index showing a steady deterioration in the conservation status of the global avifauna over the past three decades. We identify key measures to counter this loss of avian biodiversity and associated ecosystemservices, which will necessitate increased consideration of the social context of bird conservation interventions in order to deliver positive transformative change for nature.

Exploring surface water as a transmission medium of avian influenza viruses – systematic infection studies in mallards

ABSTRACT Mallards (Anas platyrhynchos) are an abundant anseriform migratory wild bird species worldwide and an important reservoir for the maintenance of low pathogenicity (LP) avian influenza viruses (AIV). They have also been implicated in the spread of high pathogenicity (HP) AIV after spill-over events from HPAIV-infected poultry. The spread of HPAIV within wild water bird populations may lead to viral contamination of natural habitats. The role of small shallow water bodies as a transmission medium of AIV among mallards is investigated here in three experimental settings. (i) Delayed onset but rapid progression of infection seeded by two mallards inoculated with either LP or HP AIV to each eight sentinel mallards was observed in groups with access to a small 100 L water pool. In contrast, groups with a bell drinker as the sole source of drinking water showed a rapid onset but lengthened course of infection. (ii) HPAIV infection also set off when virus was dispersed in the water pool; titres as low as 102 TCID50 L−1 (translating to 0.1 TCID50 mL−1) proved to be sufficient. (iii) Substantial loads of viral RNA (and infectivity) were also found on the surface of the birds’ breast plumage. “Unloading” of virus infectivity from contaminated plumage into water bodies may be an efficient mechanism of virus spread by infected mallards. However, transposure of HPAIV via the plumage of an uninfected mallard failed. We conclude, surface water in small shallow water bodies may play an important role as a mediator of AIV infection of aquatic wild birds.

Landscape heterogeneity affects diurnal raptor communities in a sub-tropical region of northwestern Himalayas, India.

Raptors are highly sensitive to environmental and human-induced changes. In addition, several species of raptors exist in considerably small numbers. It is thus critical to conserve raptors and their habitats across relatively larger landscapes. We examined the diurnal raptor assemblages and seasonality in a subtropical habitat in India’s northwestern Himalayas. Quantitative data on diurnal birds of prey and their habitat features across six distinct habitat types were collected from 33 sample sites. We observed 3,434 individuals of 28 diurnal raptors belonging to two orders and three families during a two-year survey from December 2016 to November 2018. A significant variation in bird species richness and abundance was found across habitats and seasons, with farmlands and winters being the most diverse and speciose. The generalized linear model, used to determine raptor community responses, indicated that elevation and proximity to dumping sites significantly affected the raptor abundance. The non-metric multidimensional scaling (NMDS) revealed significant differences in raptor assemblages across the habitat types. The study concluded that raptors’ persistence is largely determined by their preference for favourable feeding, roosting, and nesting opportunities. The presence of protected and habitat-exclusive species validates the high conservation importance of these ecosystems, particularly the forest patches and farmlands, necessitating robust conservation and management measures in this part of northwestern Himalaya.

Importance of peatlands to maintain avian diversity in the Bolivian High Andes

The High Andean peatlands are peat-accumulating wetlands dominated by cushion-forming plants and are embedded in a matrix of puna grasslands above 4,000 m. These ecosystems are an essential source of water and evergreen vegetation for wild and domestic animals and are considered sensitive to environmental alterations. We studied the birds' habitat and microhabitat preference in peatlands and their surrounding grasslands in the Cordillera Real, Bolivia. We established 3 parallel transects around 12 peatlands: (1) in peatland, (2) at 100–200 m from the peatland edge, considered as the transition habitat between peatlands and grasslands, and (3) in puna grasslands at >500 m from the peatland edge. We quantified bird abundance, species richness, and the availability of 8 microhabitats along 36 transects. We recorded 934 individuals of 34 species and found higher bird species richness and abundance in peatlands than in surrounding grasslands and transition habitats. We found that 26% of bird species were exclusive to peatlands. While most bird species common in peatlands were almost nonexistent in other habitats, most species associated with grasslands were also found in proximity to peatlands. A canonical correspondence analysis showed that bird species were associated with one or more microhabitats. The high abundance, bird species richness, and diet types in peatlands is probably related to the high primary productivity of peatlands and year-round availability of water. Degradation of these peatlands may reduce the abundance of regional bird communities, not only peatland specialists but also species in surrounding habitats.

Habitat provision is a major driver of native bird communities in restored urban forests.

Urbanization, and the drastic loss of habitat it entails, poses a major threat to global avian biodiversity. Ecological restoration of urban forests is therefore increasingly vital for native bird conservation, but control of invasive predators may also be needed to sustain native bird populations in cities where species invasions have been particularly severe.We evaluated restoration success by investigating changes in native bird communities along a restoration chronosequence of 25 restored urban forests representing 72 years of forest development, which we compared to two target reference systems and a control system. We hypothesized that total species richness and relative abundance of native forest birds would increase with the age of restoration planting. We further hypothesized that relative abundance of rats, possums and cats would negatively impact native birds, while amount of native forest in the surrounding landscape would have a positive effect.We used structural equation modelling (SEM) to investigate the relative influence of forest structure (complexity index, tree height, canopy openness, basal area, species richness and density), landscape attributes (patch area, perimeter length, landscape composition within three buffer zones, distance to the nearest road and water source) and invasive mammalian predator indices of relative abundance on total species richness and relative abundance of native forest birds.Species richness increased with age of restoration planting, with community composition progressing towards that found in target reference systems. SEM revealed that years restored was a direct driver of bird species richness but an indirect driver of abundance, which was directly driven by canopy openness. Contrary to our predictions, invasive mammals had no significant effect on native bird species richness or abundance.Our results demonstrate that provision and improvement of habitat quantity and quality through restoration is the vital first step to re‐establishing native forest bird communities in cities.

Species Richness, Abundance, and Productivity of Birds Along a Powerline Right-of-way within a Forested Landscape, Northeastern United States

Utility rights-of-way (ROW) serve as nesting areas and maintain a high diversity of early successional birds. ROW incorporating wire zone–border zone and integrated vegetation management can be used as examples of early successional habitat management for bird conservation more generally in the Northeastern United States, given artificial disturbances not created solely for natural resource conservation comprise approximately 80% of early successional habitats. The objective of our study was to determine the effect of herbicide and mechanical vegetation management approaches on the abundance, species richness, and reproductive success of breeding bird species occupying an electric transmission line ROW in central Pennsylvania. The overall abundance of birds was significantly lower within the wire and border management zones, following initiation of a new vegetation management cycle at State Game Lands (SGL 33) than in the years prior to management. Sections of ROW with no border zones contained the lowest abundance and species richness of breeding birds compared to sections with borders prior to the initiation of a new management cycle. Sections of ROW with no border zones and mowing sections had the lowest bird abundance and species richness of all ROW sections at the onset of a new management cycle, and contained the lowest number of bird species displaying evidence of breeding, both prior to and at the beginning of management cycles. Sections of ROW managed using herbicides were comparable or more beneficial to bird communities in terms of abundance, species richness, indices of productivity, and nesting success than sections maintained via mechanical treatments (mowing and hand cutting), both at the end and beginning of management cycles within a forested landscape in the central Appalachian Mountains and surrounding forested regions in the northeastern United States.

Local abundances of terrestrial mammal and bird species around indigenous villages in Suriname

AbstractHunting is an important threat to tropical wildlife, yet many people are dependent on forest fauna for protein provisioning. We analyzed abundances of terrestrial mammal and bird species around four indigenous villages in the south of Suriname, using camera trap data and the Royle–Nichols abundance model. We hypothesized that hunting pressure increases with decreasing distance to a village and with increasing village size (expressed as cropland area). We detected 24 animal species in all villages combined, including several rare species. For 11 of the 24 species, we were able to examine if and how distance to a village and village size related to local abundances and found a positive effect of distance to village on local abundances in five species, and a negative effect of village size in one species. Because villages, and thus hunting, affect local abundances of terrestrial bird and mammal species in our study, we recommend monitoring forest fauna in areas where people are highly dependent on animals for food provisioning.

The role of urban green space design to support bird community in the urban ecosystem

Abstract. Prihandi DR, Nurvianto S. 2022. The role of urban green space design to support bird community in the urban ecosystem. Biodiversitas 23: 2137-2145. The increase in human population due to urbanization causes the expansion of urban areas that threatens forest lands to be lost and makes a serious threat to its biodiversity. Along with changes in the landscape due to urbanization, open green space is an alternative solution to maintaining biological diversity in urban areas. However, various types of open green spaces were developed following certain objectives of landscape management that potentially have different effects on biodiversity. This research aimed to identify the role of various open green spaces designs on bird biodiversity. Birds can be a good indicator of environmental quality because birds are a type of animal that can move in different habitat types and habitat areas and are often used as an indicator of habitat quality in urban areas. Bird observation was conducted using the point count method, while the environmental conditions were recorded using the nested and protocol sampling method. Those data were collected in five different open green spaces of Daerah Istimewa Yogyakarta Province. Species diversity shows the diversity of species in a bird community in a certain area using the Shanon-Wiener index. Bird communities were also analyzed using rarefaction analysis. This analysis was used to standardize the species abundance in each type of green open space to estimate the ideal species richness of open green space from the different number of samples. The Kruskal-Wallis test was used to compare the value of diversity, richness, and relative abundance of bird species among five different types of open green space. We used Canonical Correspondence Analysis (CCA) to visualize the bird's response toward environmental gradients. Generalized Linear Model (GLM) was employed to determine the effect of the environmental factors on the diversity of bird species. The result showed that different types of urban green spaces have different richness and relative abundance of bird species. We found 5925 individual birds from 40 species in five different types of open green spaces. The garden was the type of open green space with the highest bird species diversity. Of the many variables taken, the slope and the number of vehicles per minute affected the diversity of species. Those two variables were also negatively correlated with the diversity of bird species in the five types of open green spaces. The number of vehicles causes noise and pollution, which causes a decrease in bird populations. Flat slopes can also help birds get food, such as seeds on a flat surface. Creating more gardens for public and private spaces becomes an alternative solution to enhance bird diversity in the urban area.