Results 21 to 30 of about 16,158 (249)

The flight feather moult pattern of the bearded vulture (Gypaetus barbatus). [PDF]

open access: yes, 2016
Moult is an extremely time-consuming and energy-demanding task for large birds. In addition, there is a trade-off between the time devoted to moulting and that invested in other activities such as breeding and/or territory exploration. Moreover, it takes
A Adam   +43 more
core   +2 more sources

Validating the use of intrinsic markers in body feathers to identify inter-individual differences in non-breeding areas of northern fulmars [PDF]

open access: yes, 2016
Acknowledgments We thank Claire Deacon, Gareth Norton and Andrea Raab for help with laboratory work at the University of Aberdeen, and Barry Thornton and Gillian Martin for running stable isotope analysis at the James Hutton Institute.
Graham, Isla M.   +4 more
core   +2 more sources

Using field photography to study avian moult [PDF]

open access: yes, 2017
Methods to obtain moult data from wild birds have not changed much over the last century and most studies still depend on checking museum specimens or capturing birds.
Furness, Robert W.   +2 more
core   +1 more source

Contribution to understanding the evolution of holometaboly: transformation of internal head structures during the metamorphosis in the green lacewing Chrysopa pallens (Neuroptera: Chrysopidae)

open access: yesBMC Evolutionary Biology, 2020
Background Metamorphosis remains one of the most complicated and poorly understood processes in insects. This is particularly so for the very dynamic transformations that take place within the pupal sheath of holometabolous insects.
Chenjing Zhao   +9 more
doaj   +1 more source

Flight feather moult in Western Marsh Harriers during autumn migration

open access: yesAvian Research, 2019
Background Most of long-distance migratory raptors suspend moult during migration but detailed information is patchy for most of the Palearctic species.
Juan Ramírez, Michele Panuccio
doaj   +1 more source

Determinants and constraints of feather growth.

open access: yesPLoS ONE, 2020
During the periodic moult of the plumage of birds, a fast regrowth of feathers would shorten the time of reduced plumage functionality. However, it has long been known that feather growth-rate is limited and that long feathers take disproportionally ...
Lukas Jenni   +3 more
doaj   +1 more source

Beak colour dynamically signals changes in fasting status and parasite loads in king penguins [PDF]

open access: yes, 2016
This research was funded by the French Polar Institute (IPEV–Research Program 119) and the French National Centre for Scientific Research (CNRS-INEE). Field logistic support was provided by Terres Australes et Antarctiques Françaises. Q.S.
Bize, Pierre   +5 more
core   +3 more sources

The Implicit Relational Assessment Procedure (IRAP) as a measure of spider fear, avoidance and approach [PDF]

open access: yes, 2016
The current study examined the use of the Implicit Relational Assessment Procedure (IRAP) as a measure of spider fear, approach, and avoidance. Participants were drawn from a normative sample of university undergraduates.
Barnes-Holmes, Patrick Michael Dermot   +2 more
core   +2 more sources

Combination of at-sea activity, geolocation and feather stable isotopes documents where and when seabirds moult

open access: yesFrontiers in Ecology and Evolution, 2016
Key facets of the foraging ecology of seabirds during the inter-breeding period still remain poorly understood because of the difficulty of studying them at sea, including during the energy-demanding moulting stage.
Yves eCherel   +3 more
doaj   +1 more source

Comparación de la extensión de la muda posjuvenil en el ruiseñor pechiazul ibérico (Luscinia svecica azuricollis) con dos subespecies próximas geográficamente [PDF]

open access: yesMunibe Ciencias Naturales
El ruiseñor pechiazul ibérico Luscinia svecica azuricollis es una subespecie que cría en zonas de montaña del noroeste de la Península Ibérica y que cuenta con una reducida ventana temporal para mudar entre la cría y la migración.
Daniel Alonso   +3 more
doaj   +1 more source

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