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  1. Winter numbers of the northwest European population of Bewick’s Swans (Cygnus columbianus bewickii) declined recently by c. 40%. During the same period, numbers of two sympatric and ecologically-similar congeners...

    Authors: Kevin A. Wood, Julia L. Newth, Geoff M. Hilton and Eileen C. Rees

    Citation: Avian Research 2021 12:48

    Content type: Research

    Published on:

  2. Long-term ringing and telemetry studies show that the Osprey (Pandion haliaetus) is a broad-front migrant following different migratory flyways, depending on the geographical location of their breeding population...

    Authors: Dariusz Anderwald, Łukasz Czajka, Sławomir Rubacha, Michał Zygmunt and Paweł Mirski

    Citation: Avian Research 2021 12:46

    Content type: Research

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  3. Ecological functions and processes in urban ecosystems are governed by various human activities. City-adapted and city-exploiting animal species are expected to present certain specific behavioral and physiolo...

    Authors: Hani Amir Aouissi, Mostefa Ababsa, Aissam Gaagai, Zihad Bouslama, Yassine Farhi and Haroun Chenchouni

    Citation: Avian Research 2021 12:45

    Content type: Research

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  4. Efficient and selective utilization of metabolic substrates is one of the key strategies in high-altitude animals to cope with hypoxia and hypothermia. Previous findings have shown that the energy substrate ut...

    Authors: Boyang Ding, Yuliang Zhao, Yanfeng Sun, Qian Zhang, Mo Li, Ghulam Nabi, Yuefeng Wu, Chuan Jiang and Dongming Li

    Citation: Avian Research 2021 12:44

    Content type: Research

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  5. The abundance of insects has decreased considerably during recent decades, resulting in current abundance showing 70–80% reductions in more than 15 studies across temperate climate zones. Dramatic reductions i...

    Authors: Anders Pape Møller, Dorota Czeszczewik, Einar Flensted-Jensen, Johannes Erritzøe, Indrikis Krams, Karsten Laursen, Wei Liang and Wiesław Walankiewicz

    Citation: Avian Research 2021 12:43

    Content type: Research

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  6. Diet analysis is essential to understanding the functional role of large bird species in food webs. Morphological analysis of regurgitated bird pellet contents is time intensive and may underestimate biodivers...

    Authors: Charlotte E. Hacker, Brandon D. Hoenig, Liji Wu, Wei Cong, Jingjing Yu, Yunchuan Dai, Ye Li, Jia Li, Yadong Xue, Yu Zhang, Yunrui Ji, Hanning Cao, Diqiang Li, Yuguang Zhang and Jan E. Janecka

    Citation: Avian Research 2021 12:42

    Content type: Research

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  7. Electrocution and collisions on power lines are among the leading causes of non-natural mortality for birds. Power lines are exponentially increasing, particularly in developing countries, but mitigation strat...

    Authors: Adrian Orihuela-Torres, Juan M. Pérez-García, Zebensui Morales-Reyes, Lara Naves-Alegre, José A. Sánchez-Zapata and Esther Sebastián-González

    Citation: Avian Research 2021 12:41

    Content type: Research

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  8. Animals need to adjust their vigilance strategies when foraging between physically contrasting vegetated and non-vegetated habitats. Vegetated habitats may pose a greater risk for some if vegetation characteri...

    Authors: Jing Zhang, Hang Zhang, Yu Liu, Huw Lloyd, Jianqiang Li, Zhengwang Zhang and Donglai Li

    Citation: Avian Research 2021 12:39

    Content type: Research

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  9. Despite an increasing number of surveys and a growing interest in birdwatching, the population and distribution of Asian Dowitcher (Limnodromus semipalmatus), a species endemic to the East Asian–Australasian and ...

    Authors: Ziyou Yang, Jing Li, Yongxiang Han, Chris J. Hassell, Kar-Sin Katherine Leung, David S. Melville, Yat-tung Yu, Lin Zhang and Chi-Yeung Choi

    Citation: Avian Research 2021 12:38

    Content type: Research

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  10. Communal roosting is a common avian social behaviour, which potentially provides foraging benefits, predation avoidance or thermoregulation in birds. To identify the crucial environmental factors associated wi...

    Authors: Sifeng Wang and L. M. Chu

    Citation: Avian Research 2021 12:35

    Content type: Research

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  11. Bird nests are an important part of avian ecology. They are a powerful tool for studying not only the birds that built them, but a wide array of topics ranging from parasitology, urbanisation and climate chang...

    Authors: Tonya M. Haff, Natalie Tees, Kathryn Wood, E. Margaret Cawsey, Leo Joseph and Clare E. Holleley

    Citation: Avian Research 2021 12:34

    Content type: Research

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  12. Interspecific competition is known to be strongest between those species that are both closely related and sympatric. Egrets are colonially nesting wetland birds that often overlap and can therefore be expecte...

    Authors: Yuanxing Ye, Canshi Hu, Yiting Jiang, Geoffrey W. H. Davison and Changqing Ding

    Citation: Avian Research 2021 12:33

    Content type: Research

    Published on:

  13. The European Kingfisher (Alcedo atthis) is a small plunge-diving bird, today considered a species of conservation concern in Europe given its rapid population decline observed across the continent. We implemented...

    Authors: Raphaël Musseau, Melina Bastianelli, Clementine Bely, Céline Rousselle and Olivier Dehorter

    Citation: Avian Research 2021 12:30

    Content type: Research

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  14. In this study we examined the habitat preferences of three diurnal raptors in relation to human access. We aimed to identify the selection of breeding habitat by the Golden Eagle (Aquila chrysaetos), the Long-leg...

    Authors: Nadejda Djorgova, Dimitar Ragyov, Valko Biserkov, Jordan Biserkov and Boris P. Nikolov

    Citation: Avian Research 2021 12:29

    Content type: Research

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  15. Accurate nestling age is valuable for studies on nesting strategies, productivity, and impacts on reproductive success. Most aging guides consist of descriptions and photographs that are time consuming to read...

    Authors: Audrey A. Sanchez, Andrew W. Bartlow, Allison M. Chan, Jeanne M. Fair, Aaron A. Skinner, Kelly Hutchins, Maria A. Musgrave, Emily M. Phillips, Brent E. Thompson and Charles D. Hathcock

    Citation: Avian Research 2021 12:28

    Content type: Methodology

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  16. Genes of the major histocompatibility complex (MHC) are an important component of the vertebrate immune system and play a significant role in mate choice in animal populations. However, the MHC genetic targets...

    Authors: Mingju E, Xiaolei Song, Liufang Wang, Yimo Yang, Xianxiu Wei, Jiangping Yu, Ye Gong and Haitao Wang

    Citation: Avian Research 2021 12:27

    Content type: Research

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  17. Spatial variation of land cover can result in the changes of community similarities and biotic homogenization, whereby the increasing similarity would reduce the adaptive capacity of biotic assemblages to furt...

    Authors: Aichun Xu, Maojun Zhong, Ke Tang, Xiaoyi Wang, Chen Yang, Haigen Xu, Jianfeng Yi, Wei Liu, Chunlan Zhang and Junhua Hu

    Citation: Avian Research 2021 12:25

    Content type: Research

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  18. Kiwi (Apteryx spp.) are flightless ratites from New Zealand whose numbers and distributions have declined following human arrival. Some of the kiwi species are known to hybridise but the extent of hybridization i...

    Authors: Lara D. Shepherd, Alan J. D. Tennyson, Hugh A. Robertson, Rogan M. Colbourne and Kristina M. Ramstad

    Citation: Avian Research 2021 12:24

    Content type: Research

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  19. Efficient and safe movement is fundamental for wild birds to thrive in their environments. For arboreal forest animals, especially birds, canopy cover has a large impact on birds’ daily movements and is a cruc...

    Authors: Jin Bai, Chelsea A. Weitekamp, Kelly Frye and Kathryn E. Sieving

    Citation: Avian Research 2021 12:23

    Content type: Research

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  20. Flowerpiercers (Diglossa) are traditionally considered as “parasites” of the pollination processes, as they can access the nectar without entering in contact with the reproductive structures of the plants. Nevert...

    Authors: Jairo Andrés Cuta-Pineda, Luis Alejandro Arias-Sosa and Roxibell C. Pelayo

    Citation: Avian Research 2021 12:22

    Content type: Research

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  21. The composition of intestinal microflora in animals is affected by cross-species transmission. In a nature reserve, the foraging sites of waterbirds are relatively fixed, but frequently close to residential ar...

    Authors: Wei Wang, Lizhi Zhou, Rong Fu, Lei Cheng, Shaofei Yan, Nazia Mahtab and Yunwei Song

    Citation: Avian Research 2021 12:20

    Content type: Research

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  22. As an important player during food digestion, gut microbiota has attracted much attention in diet adaptation studies in birds. Microbiota extracted from feces has been widely used as a proxy for gut microbiota...

    Authors: Xian Hou, Shengkai Pan, Zhenzhen Lin, Jiliang Xu and Xiangjiang Zhan

    Citation: Avian Research 2021 12:19

    Content type: Methodology

    Published on:

    The Correction to this article has been published in Avian Research 2021 12:26

  23. Understanding how species diversify is a long-standing question in biology. The allopatric speciation model is a classic hypothesis to explain the speciation process. This model supposes that there is no gene ...

    Authors: Pengcheng Wang, Chiafen Yeh, Jiang Chang, Hongyan Yao, Yiqiang Fu, Chengte Yao, Xiao Wang, Shouhsien Li and Zhengwang Zhang

    Citation: Avian Research 2021 12:17

    Content type: Research

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  24. Some studies have indicated that the Horned Larks (Eremophila alpestris) should be considered as a species complex. Recently it split into four species or clades and seven subclades based on genetic, morphologica...

    Authors: Jimmy Alexander Vargas-Puentes, Luis Alejandro Arias-Sosa and Carolina Ramos-Montaño

    Citation: Avian Research 2021 12:16

    Content type: Research

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  25. In bird species where offspring growth and survival rely on parents’ food provisioning, parents can maximise their fitness by increasing the quantity and/or the quality of preys delivered to their offspring. M...

    Authors: Laure Cauchard, Elise Isabella Macqueen, Rhona Lilley, Pierre Bize and Blandine Doligez

    Citation: Avian Research 2021 12:15

    Content type: Research

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  26. One of the most challenging tasks in wildlife conservation and management is clarifying which and how external and intrinsic factors influence wildlife demography and long-term viability. The wild population o...

    Authors: Yashuai Zhang, Fang Wang, Zhenxia Cui, Min Li, Xia Li, Xinping Ye and Xiaoping Yu

    Citation: Avian Research 2021 12:14

    Content type: Research

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  27. Great diversity exists in the parenting pattern of altricial birds, which has long been considered as an adaptive response to specific environmental conditions but not to their life-history style.

    Authors: Liqing Fan, Lifang Gao, Zhenqin Zhu, Xiaodan Zhang, Wen Zhang, Haiyang Zhang, Jianchuan Li and Bo Du

    Citation: Avian Research 2021 12:11

    Content type: Research

    Published on:

  28. The Rufous-backed Bunting, Emberiza jankowskii, is an endangered species that is primarily distributed in Inner Mongolia, China. The main threats to the continued persistence of this species are habitat loss and ...

    Authors: Shi Li, Dan Li, Lishi Zhang, Weiping Shang, Bo Qin and Yunlei Jiang

    Citation: Avian Research 2021 12:7

    Content type: Research

    Published on:

  29. The Red-footed Falcon (Falco vespertinus) is a species of high international conservation interest. We analyzed its hunting behavior at the two largest colonies in Italy during the nestling period. Using accurate...

    Authors: Marco Gustin and Alessandro Ferrarini

    Citation: Avian Research 2021 12:6

    Content type: Letter to the Editor

    Published on:

  30. To understand the dietary composition of the highly aerial swift (Apodidae), ecologists conventionally depend on the morphological identification of prey items from food boluses or stomach contents, but these ...

    Authors: Chun Ting Chung, Hok Sze Wong, Man Long Kwok, Qi Meng and King Ming Chan

    Citation: Avian Research 2021 12:5

    Content type: Research

    Published on:

  31. There is increasing interest in evaluating home-range overlap (or, otherwise, segregation) between bird species, and between or within bird populations, to inform spatial planning. So far, studies of home-rang...

    Authors: Alessandro Ferrarini, Giuseppe Giglio, Stefania Caterina Pellegrino and Marco Gustin

    Citation: Avian Research 2021 12:4

    Content type: Methodology

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  32. Land-use change is one of the main drivers of the global erosion of biodiversity. In that context, it is crucial to understand how landscape characteristics drive the presence of rare endangered species. Never...

    Authors: Bertille Mohring, François Brischoux and Frédéric Angelier

    Citation: Avian Research 2021 12:3

    Content type: Research

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  33. Patterns of rarity can be explained by reproductive rates, levels of endemism, and habitat specificity, and knowledge on these parameters is important to understand the levels of vulnerability of each species ...

    Authors: Daniel F. Perrella, Paulo V. Q. Zima and Mercival R. Francisco

    Citation: Avian Research 2021 12:2

    Content type: Research

    Published on:

  34. The Bar-headed Goose (Anser indicus) breeds across the high plains and plateau of Central Asia and winters in the Qinghai-Tibet Plateau (QTP), the Yunnan-Guizhou Plateau and the Indian sub-continent. Of the two r...

    Authors: Junjian Zhang, Yanbo Xie, Laixing Li, Nyambayar Batbayar, Xueqin Deng, Iderbat Damba, Fanjuan Meng, Lei Cao and Anthony David Fox

    Citation: Avian Research 2020 11:49

    Content type: Research

    Published on:

  35. Reconciling agriculture and biodiversity conservation is a challenge given the growing demand for agricultural products. In recent decades, Argentina has witnessed agricultural expansion and intensification af...

    Authors: Andrea P. Goijman, Michael J. Conroy, Vanina D. Varni, Jeffrey J. Thompson and María Elena Zaccagnini

    Citation: Avian Research 2020 11:48

    Content type: Research

    Published on:

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