Avian Research最新文献

{"title":"Corrigendum to “Swan Project promotes citizen science initiative through a public bird migration tracking” [Avian Res. 16 (2025) 100298]","authors":"Tetsuo Shimada , Kan Konishi , Guozheng Li , Guodong Shi , Hiroyoshi Higuchi","doi":"10.1016/j.avrs.2025.100302","DOIUrl":"10.1016/j.avrs.2025.100302","url":null,"abstract":"","PeriodicalId":51311,"journal":{"name":"Avian Research","volume":"16 4","pages":"Article 100302"},"PeriodicalIF":1.7,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Importance of surrounding landscape features in explaining wintering waterbird diversity and community assembly in Jiangsu's inland lake wetlands","authors":"Haoteng Zhang ,&nbsp;Lijun Xiao ,&nbsp;Zixi Zhao ,&nbsp;Shenglai Yin ,&nbsp;Yong Zhang","doi":"10.1016/j.avrs.2025.100295","DOIUrl":"10.1016/j.avrs.2025.100295","url":null,"abstract":"<div><div>As one of the important wintering areas along the East Asian–Australasian Flyway, wetlands in the Yangtze River floodplain face threats from land-use changes, yet its effects on wintering waterbirds at the landscape level remain understudied, impeding conservation practice. Here, using survey data collected across 14 inland lakes in Jiangsu Province in 2022, we calculated wintering waterbirds diversity (taxonomic, functional, phylogenetic) and assembly patterns (MPD/MNTD of functional and phylogenetic). Then, we interpreted satellite imagery of lake areas and buffer zones (5 km), and partitioned them into three land-use and landscape index categories (anthropogenic, ecological, and lake landscape). Finally, we employed multiple linear regression and hierarchical partitioning to explain the influence of landscape scales on wintering waterbird communities. Our results showed that the diversity and assembly of regional wintering waterbird communities tended to be consistent across taxonomic, functional, and phylogenetic dimensions. The standardized diversity indices indicated that functional assembly of communities tends to be clustered at both local and regional scale. In contrast, the phylogenetic structure showed a predominantly overdispersed pattern in most lakes at the local scale, while neutral processes dominated at the regional scale. Modeling showed that selected variables explained waterbird diversity and assembly well. Lake fragmentation increased species evenness but reduced other diversity indices, while landscape evenness was negatively associated with functional and phylogenetic assembly. Among anthropogenic factors, aquaculture ponds and impervious surfaces reduced all diversity dimensions, whereas cropland connectivity enhanced phylogenetic diversity. These factors had consistent effects on community assembly. For ecological variables, grassland area enhanced functional and phylogenetic diversity but led to more clustered functional assembly. Overall, maintaining the integrity and connectivity of lakes and their surrounding landscapes is essential for sustaining waterbird diversity and guiding wetland restoration.</div></div>","PeriodicalId":51311,"journal":{"name":"Avian Research","volume":"16 4","pages":"Article 100295"},"PeriodicalIF":1.7,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144911551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Visual cues modulate nest defense behavior in Japanese Tits: Insights from the appearance, posture and size of snake dummies","authors":"Dake Yin ,&nbsp;Jiangping Yu ,&nbsp;Romain Lorrillière ,&nbsp;Jiangping Jin ,&nbsp;Mingju E ,&nbsp;Longru Jin ,&nbsp;Haitao Wang","doi":"10.1016/j.avrs.2025.100290","DOIUrl":"10.1016/j.avrs.2025.100290","url":null,"abstract":"<div><div>Predator dummies are usually used to explore the impact of predator features on the anti-predator behavior of birds. Previous studies have shown that the morphology and behavior of aerial predators can signal different threat levels to birds. However, whether subtle changes in ground predator dummies cause changes in the nest defense behavior of parent birds is unclear. In this study, we aimed to investigate whether Japanese Tits (<em>Parus minor</em>) exhibit different nest defense behaviors in response to experimentally manipulated variations in the appearance, posture, and size of virtual snake proxies (common nest predators). During the incubation period, we observed the nest defense behaviors of the parent tits against taxidermized Siberian Ratsnakes (<em>Elaphe schrenckii</em>) with varied characteristics and rubber-made model snakes. The tits exhibited more intense responses to taxidermized large (body length about 120 cm) coiled ratsnakes than to large coiled model snakes. They exhibited weaker responses to taxidermized small (body length about 20 cm) coiled ratsnakes than to taxidermized small sinusoidal ratsnakes. In addition, they exhibited more intense responses to taxidermized large coiled ratsnakes than to taxidermized small coiled ratsnakes, and more intense responses to taxidermized small sinusoidal ratsnakes than to large model snakes. However, there was no difference in the response of tits to taxidermized small sinusoidal ratsnakes and taxidermized large coiled ratsnakes, or to taxidermized small coiled ratsnakes and model snakes. Thus, the presence of scales, a sinusoidal posture, and a large body size of snake dummies can induce more intense behavioral responses in Japanese Tits. We suggested that Japanese Tits can discriminate subtle differences in ground predator dummies of nests and exhibit different nest defense behaviors.</div></div>","PeriodicalId":51311,"journal":{"name":"Avian Research","volume":"16 4","pages":"Article 100290"},"PeriodicalIF":1.7,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144895922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Avian phylogenetic and functional diversity and their influencing factors in urban parks of Nanjing, China","authors":"Qihuan He,&nbsp;Xu Jiang,&nbsp;Yinuo Feng,&nbsp;Jie Shao,&nbsp;Xingchang Yang,&nbsp;Xueru Yang,&nbsp;Xinwei Tan,&nbsp;Yanping Wang","doi":"10.1016/j.avrs.2025.100289","DOIUrl":"10.1016/j.avrs.2025.100289","url":null,"abstract":"<div><div>The acceleration of global urbanization has caused habitat loss, fragmentation, and decrease of habitat quality, often leading to a decline in biodiversity. However, most previous urbanization studies focused on taxonomic diversity, with relatively less research on functional and phylogenetic diversity. In this study, we examined the phylogenetic and functional diversity and underlying influencing factors of bird communities in 37 urban parks in Nanjing, China. We conducted a systematic survey of bird communities in Nanjing urban parks and selected six park characteristics that are generally considered to affect bird diversity. Model selection based on corrected Akaike Information Criterion (AICc) and model averaging showed that park area, habitat diversity and building index (a proxy for the degree of urbanization) were significant factors affecting avian phylogenetic and functional diversity in Nanjing urban parks. Specifically, habitat diversity and park area were positively correlated with bird diversity, while the building index was negatively correlated with bird diversity. Moreover, the phylogenetic and functional structures of urban bird communities exhibited a clustered pattern, indicating that environmental filtering might play a role in shaping community composition. In addition, building index had certain impact on the construction of bird phylogenetic communities in urban parks. Our results suggest that expanding park areas, increasing habitat diversity and reducing building indexes may be effective measures to increase the avian phylogenetic and functional diversity in our system.</div></div>","PeriodicalId":51311,"journal":{"name":"Avian Research","volume":"16 4","pages":"Article 100289"},"PeriodicalIF":1.7,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144841680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Swan Project promotes citizen science initiative through a public bird migration tracking","authors":"Tetsuo Shimada ,&nbsp;Kan Konishi ,&nbsp;Guozheng Li ,&nbsp;Guodong Shi ,&nbsp;Hiroyoshi Higuchi","doi":"10.1016/j.avrs.2025.100298","DOIUrl":"10.1016/j.avrs.2025.100298","url":null,"abstract":"","PeriodicalId":51311,"journal":{"name":"Avian Research","volume":"16 4","pages":"Article 100298"},"PeriodicalIF":1.7,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Birds of a feather: Comprehensive plumage colour analysis for a revised subspecies classification of the Chestnut-winged Babbler (Cyanoderma erythropterum) species complex","authors":"Shen Han Teo ,&nbsp;Yong Chee Keita Sin ,&nbsp;Mayjean Marie Ines Nieves,&nbsp;Frank E. Rheindt","doi":"10.1016/j.avrs.2025.100307","DOIUrl":"10.1016/j.avrs.2025.100307","url":null,"abstract":"<div><div>Quantitative analysis of colouration is an essential tool for subspecies delimitation but has always posed a challenge in avian taxonomy. In this study on the Chestnut-winged Babbler (<em>Cyanoderma erythropterum</em>) species complex from tropical Southeast Asia, we made use of colour measurements taken with digital cameras and applied two methodologies—(1) the 75% subspecies rule on quantitative colourimetric variables, and (2) the CIEDE2000 colour distance method to generate phylograms, which has probably never been applied in taxonomy before. Given its large number of described subspecies, many of which have been synonymised in modern taxonomies, the species complex serves as an appropriate model to test subspecies validity. Our data indicate that one synonymised subspecies (<em>C. e. apega</em>), from the islands of Bangka and Belitung, requires re-instalment and recognition, whereas one widely recognised subspecies (<em>C. e. fulviventre</em>), from the Banyak Islands, should be synonymised. Our approach also allowed us to redraw geographic subspecies boundaries. Our work indicates that current subspecies taxonomies of many poorly known tropical species may remain error-ridden and highlights the importance and viability of large-scale taxonomic revisions targeting avian subspecies globally while incorporating quantitative colourimetric approaches.</div></div>","PeriodicalId":51311,"journal":{"name":"Avian Research","volume":"16 4","pages":"Article 100307"},"PeriodicalIF":1.7,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145319608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How many birds are there in Guangdong Province, China?","authors":"Daojian Chen ,&nbsp;Xiaohui Gao ,&nbsp;Min Zhang ,&nbsp;Xianli Che ,&nbsp;Qiang Zhang ,&nbsp;Daniel R. Gustafsson ,&nbsp;Zhengzhen Wang ,&nbsp;Anders P. Møller ,&nbsp;Alexandra Grossi ,&nbsp;Fasheng Zou","doi":"10.1016/j.avrs.2025.100305","DOIUrl":"10.1016/j.avrs.2025.100305","url":null,"abstract":"<div><div>Estimating bird abundance is key to assess threats, and to prioritize conservation actions. However, few studies focus on this topic, particularly in developing countries, which may hamper conservation efficiency. We used data collected from Guangdong Province, China, between 2000 and 2020 to estimate bird abundance using MaxEnt modelling. In total, 258 bird species were included, with an average density of 1485.2 ± 489.3 ind./km² (range: 242.9–4502.2 ind./km²). The highest density occurred in the Pearl River Estuary and on the Leizhou Peninsula. For forest birds, 203 species were included with an average density of 1236.2 ± 424.5 ind./km² (143.7–2373.1 ind./km²), and highest densities were found in the Pearl River Estuary and North River regions. For the 55 species of waterbirds, the average density was 249.0 ± 351.8 ind./km² (0.3–2336.1 ind./km²). The total number of birds in Guangdong was estimated to be 2.58 × 10⁸ ind. (2.24–3.06 × 10⁸), with a total number of forest birds estimated to be 2.15 × 10⁸ ind. (1.90–2.49 × 10⁸). The most abundant forest species (&gt;10⁷ individuals) were: Huet's Fulvetta (<em>Alcippe hueti</em>) with 2.84 × 10⁷ ind., (range: 2.73–2.95 × 10⁷), Light-vented Bulbul (<em>Pycnonotus sinensis</em>) with 1.13 × 10⁷ ind. (1.07–1.20 × 10⁷), Swinhoe's White-eye (<em>Zosterops simplex</em>) with 1.13 × 10⁷ ind. (1.09–1.17 × 10⁷), and Red-whiskered Bulbul (<em>Pycnonotus jocosus</em>) with 1.01 × 10⁷ ind. (9.66–10.47 × 10⁶). The total number of waterbirds in Guangdong was estimated to be 4.37 × 10⁷ ind. (3.38–5.75 × 10⁷). The most abundant waterbirds (&gt;10⁶ individuals) were Black-headed Gull (<em>Chroicocephalus ridibundus</em>) with 6.35 × 10⁶ ind. (5.48–7.36 × 10⁶), Pied Avocet (<em>Recurvirostra avosetta</em>) with 5.56 × 10⁶ ind. (3.75–8.24 × 10⁶), and Little Egret (<em>Egretta garzetta</em>) with 5.01 × 10⁶ ind. (4.19–6.00 × 10⁶). The densities and abundances of the 41 species listed as threatened in IUCN (higher than NT) or Chinese National Protected lists (higher than II) were evaluated, of which the population sizes of nine species were estimated for the first time in Guangdong. Moreover, all 41 species' average densities significantly declined from 2012 to 2017 in Nanling National Natural Reserve, Guangdong.</div></div>","PeriodicalId":51311,"journal":{"name":"Avian Research","volume":"16 4","pages":"Article 100305"},"PeriodicalIF":1.7,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145319604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of night lighting on avian cognitive function: Mechanisms involving neurodegeneration, metabolic dysregulation and neuroinflammatory responses","authors":"Xiaoqian Li ,&nbsp;Zeru Gong ,&nbsp;Na Zhu,&nbsp;Shuping Zhang","doi":"10.1016/j.avrs.2025.100303","DOIUrl":"10.1016/j.avrs.2025.100303","url":null,"abstract":"<div><div>The rapid expansion of urbanization has led to widespread exposure of wild birds to intensive light at night (LAN). While previous studies have established LAN-induced cognitive impairment in birds, the underlying neurobiological mechanisms remain poorly understood. We hypothesized that LAN exposure impaired cognitive function of birds potentially through neurodegeneration, metabolic dysregulation and neuroinflammatory responses in the telencephalon. Using Zebra Finches (<em>Taeniopygia guttata</em>) as an avian model, under 16L:8D photoperiods, we compared associative learning and memory abilities and neurobiological parameters between experimental groups exposed to dim light at night (LAN) versus nocturnal darkness (CTR). Compared to the CTR birds, the LAN-exposed birds exhibited significantly lower learning and memory performances, reduced neuron density and simplified dendritic morphology in the telencephalons. The key energy metabolic substrates (cholic acid, CTP, D-mannose-6-phosphate) and neuroprotective agents (trehalose, menaquinone, L-gulono-1,4-lactone) in the telencephalons of LAN-exposed birds showed depletion, while oxidative stress markers (methionine sulfoxide) and inflammatory mediators (cis-gondoic acid) exhibited elevation. The neurotransmitter dopamine and histamine metabolic pathway were disrupted in the LAN-exposed birds. The microglias were activated with pro-inflammatory IL-1β and IL-6 levels increasing and anti-inflammatory IL-10 decreasing in the telencephalons of the LAN-exposed birds. These findings indicate a potential mechanistic pathway whereby dim light exposure at night can induce neuroinflammation through oxidative stress-mediated microglial activation, energy metabolism and neurotransmitter homeostasis disruption, ultimately leading to neurodegeneration in the telencephalons of birds.</div></div>","PeriodicalId":51311,"journal":{"name":"Avian Research","volume":"16 4","pages":"Article 100303"},"PeriodicalIF":1.7,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling the effects of urban park 3D environmental features on bird diversity with interpretable machine learning: A case study of Harbin, northeastern China","authors":"Chenyang Ding ,&nbsp;Jiaqi Cai ,&nbsp;Yuandong Hu ,&nbsp;Yuxuan Liang","doi":"10.1016/j.avrs.2025.100304","DOIUrl":"10.1016/j.avrs.2025.100304","url":null,"abstract":"<div><div>Urban parks are essential habitats for birds in densely built environments. However, most studies focus only on horizontal features, overlooking the role of integrated vertical structures. Using bird records from the China Bird Report (CBR) collected between 2020 and 2024, this study focused on major urban parks in Harbin, a cold high-latitude city in Northeast China. Using interpretable machine learning models, we assessed the impact of three-dimensional (3D) park features on bird species richness and identified key variables along with their nonlinear relationships. Subsequently, we grouped bird species by ecological traits and applied ordination analysis to assess their differential abundance responses to the 3D environmental characteristics of urban parks. Results showed that: (1) urban park 3D environmental features had a certain influence on bird richness, among which disturbance from built-up land and the coverage of commercial buildings were the most important factors; (2) different bird groups responded differently to the urban park 3D environmental features. Specifically, waterbirds and generalist birds preferred mixed habitats dominated by water, wetlands, and tall vegetation, and exhibited significant edge effects caused by built-up land disturbance. In contrast, forest birds were mainly affected by greenspace configuration. Although they showed tolerance to human disturbance, this trend may increase the risk of biotic homogenization. The study used a 3D environmental framework integrating horizontal and vertical dimensions to explore how bird diversity is shaped, providing detailed recommendations for biodiversity-sensitive park planning in Harbin.</div></div>","PeriodicalId":51311,"journal":{"name":"Avian Research","volume":"16 4","pages":"Article 100304"},"PeriodicalIF":1.7,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Duets encode morphological information from both partners in Rufous Horneros","authors":"Pedro Diniz ,&nbsp;Paulo S. Amorim","doi":"10.1016/j.avrs.2025.100282","DOIUrl":"10.1016/j.avrs.2025.100282","url":null,"abstract":"<div><div>Acoustic signals in birds are often influenced by body and beak size (the morphological constraint hypothesis) and may also reflect the sender's condition (the condition dependence hypothesis). However, these ideas have seldom been tested in duetting species, where the acoustics of the combined signal could relate to the morphology of both vocalizing individuals. In this study, we investigated whether specific morphological traits—scaled mass index, wing length, and bill surface area—could predict individual and pair-level characteristics of Rufous Hornero (<em>Furnarius rufus</em>) duets. In this species, partners partially overlap their songs, with males producing faster-paced, lower-pitched songs compared to females. Morphology was most closely associated with the timing of syllables within duets, though different traits were linked to timing in each sex. Females in better condition (indicated by a higher scaled mass index) and with longer wings produced duet phrases with greater variation in syllable duration. In contrast, males with larger bills showed greater variation in both syllable duration and gaps between syllables. The degree of temporal overlap in syllables increased with female condition, but not male condition, suggesting that overlap may signal female quality. Additionally, minimum duet frequency was negatively associated with male condition, indicating that lower-frequency duets may serve as an honest signal of male quality. These findings indicate that the timing of syllables and minimum duet frequency are both condition-dependent and constrained by morphology, allowing receivers to gain multiple insights into the morphology of duetting partners in Rufous Horneros.</div></div>","PeriodicalId":51311,"journal":{"name":"Avian Research","volume":"16 4","pages":"Article 100282"},"PeriodicalIF":1.7,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144749699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}