Results 71 to 80 of about 44,293 (251)

Hummingbird Hovering Energetics During Moult of Primary Flight Feathers [PDF]

Journal of Experimental Biology, 1997
ABSTRACT How does a hovering hummingbird compensate for the loss of flight feathers during moult when the mechanism of lift force generation by flapping wings is impaired? The flight performance of five individual ruby-throated hummingbirds with moulting primary flight feathers and reduced wing area was compared with that before their ...
openaire   +2 more sources

Big Bird: A global dataset of birds in drone imagery annotated to species level

Remote Sensing in Ecology and Conservation, EarlyView.
Drones are a valuable tool for surveying birds, but manually detecting and identifying birds in drone images is costly. We assembled a diverse dataset of 23 865 images of birds captured with 21 different drones across 11 countries. We labelled 4824 of these images, detailing the location, species, posture category, age category, and sex of 49 990 birds
Joshua P. Wilson, Tatsuya Amano, Thomas Bregnballe, Alejandro Corregidor‐Castro, Roxane Francis, Diego Gallego‐García, Jarrod C. Hodgson, Landon R. Jones, César R. Luque‐Fernández, Dominik Marchowski, John McEvoy, Ann E. McKellar, W. Chris Oosthuizen, Christian Pfeifer, Martin Renner, José Hernán Sarasola, Mateo Sokač, Roberto Valle, Adam Zbyryt, Richard A. Fuller   +19 more
wiley   +1 more source

Phenotypic signatures of urbanization are scale-dependent : a multi-trait study on a classic urban exploiter [PDF]

, 2020
Understanding at which spatial scales anthropogenic selection pressures operate most strongly is a prerequisite for efficient conservation and management of urban biodiversity.
Aerts, Johan, Lens, Luc, Salleh Hudin, Noraine, Strubbe, Diederik, Teyssier, Aimeric, Vantieghem, Pieter   +5 more
core   +2 more sources

Mallard response to experimental human disturbance on sanctuary areas is mediated by hunting

Wildlife Biology, EarlyView.
Wildlife managers often provide spatial sanctuaries for wildlife to escape both lethal (e.g. hunting) and non‐lethal (e.g. non‐consumptive recreation) human disturbance. However, as societal interest in outdoor recreation continues to climb, many areas face added pressure to allow recreation, yet studies increasingly demonstrate negative effects of ...
Abigail G. Blake‐Bradshaw, Nicholas M. Masto, Cory J. Highway, Allison C. Keever, Jamie C. Feddersen, Heath M. Hagy, Bradley S. Cohen   +6 more
wiley   +1 more source

Wrinkle nanostructures generate a novel form of blue structural color in great argus flight feathers

iScience, 2023
Summary: Currently known structural colors in feathers are caused by light scattering from periodic or amorphous arrangements of keratin, melanin, and air within barbs and barbules that comprise the feather vane. Structural coloration in the largest part
Chad M. Eliason, Julia A. Clarke, Suzanne Amador Kane   +2 more
doaj   +1 more source

Monitoring active osprey nests with drones is more time efficient and less disturbing than conventional methods

Wildlife Biology, EarlyView.
Drones are used to monitor bird nesting sites at less accessible locations, such as on cliffs, human infrastructure, or within the tree canopy. While there are a growing number of studies documenting avian behavioral responses to various drones, there is a continued need to monitor taxa‐specific responses to different drone models. We explored both the
Natasha K. Murphy, Jared A. Elmore, Melanie R. Boudreau, Brian S. Dorr, Scott A. Rush   +4 more
wiley   +1 more source

Divergent primary moult-A rare moult sequence among Western Palaearctic passerines.

PLoS ONE, 2017
Wing morphology strongly affects flight performance which may consequently decline during feather moult due to the creation of feather gaps in the wing. Hence, the size and shape of moult-related wing gap may directly affect flight capacity.
Yosef Kiat
doaj   +1 more source

A framework for the ethical use of animal‐borne devices in post‐release monitoring following rehabilitation

Wildlife Biology, EarlyView.
Rehabilitation and release contribute to conservation efforts for threatened species. Ensuring that these efforts are effective requires a good understanding of the factors which determine survival and integration of released animals into wild populations.
Jessica Harvey‐Carroll, Daire Carroll, Cara-Marie Trivella, Ellen Connelly   +3 more
wiley   +1 more source

The Genetic and Morphological Basis of Local Adaptation to Elevational Extremes in an Alpine Finch. [PDF]

Ecol Evol
We investigated morphological and genetic variation in the Sierra Nevada Gray‐crowned Rosy Finch to identify traits important for local adaptation in alpine environments. By combining trait measurements with genome‐wide analyses, we uncovered loci linked to thermoregulation, altitude adaptation, and cold tolerance.
Robertson ECN, Brown TM, Deitch S, Bossu CM, Zavaleta ES, Hooten MB, Ruegg KC.   +6 more
europepmc   +2 more sources

Maximizing the detection probabilities of dusky grouse for population monitoring

Wildlife Biology, EarlyView.
Despite its status as a game species in the western USA, rigorous monitoring of dusky grouse Dendragapus obscurus populations is limited. Obtaining an adequate number of observations for effective population monitoring of dusky grouse is challenging due to difficult‐to‐reach montane habitats, cryptic behaviors, and limited personnel, time, and funds at
Elizabeth A. Leipold, Claire Gower, Lance B. McNew   +2 more
wiley   +1 more source