Results 101 to 110 of about 195,308 (340)

Nocturnal bird migration in opaque clouds [PDF]

The use of a tracking radar to measure the flight paths of migrating birds on nights with opaque clouds is discussed. The effects of wind and lack of visual references are examined.
Griffin, D. R.
core   +1 more source

A network of transient domains for breaking symmetry during anterior–posterior axis formation in the porcine embryo

Developmental Dynamics, EarlyView.
Abstract Breaking radial symmetry for anterior–posterior axis formation is one of the key developmental steps of vertebrate gastrulation and is established through a succession of transient domains defined by morphology or gene expression. Three such domains were interpreted recently in the rabbit to be part of a “three‐anchor‐point model” for axis ...
Ruben Plöger, Nikoloz Tsikolia, Christoph Viebahn   +2 more
wiley   +1 more source

Tracking radar studies of bird migration [PDF]

The application of tracking radar for determining the flight paths of migratory birds is discussed. The effects produced by various meteorological parameters are described.
Kanwisher, J. W., Teal, J. M., Williams, J. M., Williams, T. C.   +3 more
core   +1 more source

Statistical analysis of trajectories on Riemannian manifolds: Bird migration, hurricane tracking and video surveillance

, 2014
We consider the statistical analysis of trajectories on Riemannian manifolds that are observed under arbitrary temporal evolutions. Past methods rely on cross-sectional analysis, with the given temporal registration, and consequently may lose the mean ...
Klassen, Eric, Kurtek, Sebastian, Srivastava, Anuj, Su, Jingyong   +3 more
core   +1 more source

Animal Welfare as an Essential Element of One Health

Animal Research and One Health, EarlyView.
Philip Lymbery
wiley   +1 more source

Scalogram habitat measures as predictors of bird abundance

Ecography, EarlyView.
Birds select habitat characteristics, such as variability in habitat structure, across multiple spatial scales (grain and extent). Measuring habitat variability at multiple scales can better capture factors that influence avifauna communities than focusing on one scale only. One valuable tool in assessing habitat heterogeneity is the cumulative dynamic
Eduarda Silveira, Akash Anand, Anna M. Pidgeon, Eric Wood, Ryan E. Buron, Avi Bar‐Massada, Laura Farwell, Benjamin Zuckerberg, Volker C. Radeloff   +8 more
wiley   +1 more source

Fall bird migration in western North America during a period of heightened wildfire activity

Avian Conservation and Ecology, 2022
Billions of birds annually migrate between breeding and nonbreeding grounds in North America. During fall 2020, there was a series of alarming mass-mortality events of migratory birds across the western United States, with estimates of 100,000 to 1 ...
Kyle D. Kittelberger, Megan K. Miller, Çağan H. Şekercioğlu   +2 more
doaj  

Testing the core–periphery hypothesis: a standardised multi‐phylum assessment of genetic diversity of marine coastal species

Ecography, EarlyView.
The core–periphery hypothesis (CPH) predicts that genetic diversity is greatest at the centre and lowest at the edges of a species' distribution because genetic diversity is a function of a species' abundance, which is also expected to be greatest at the centre and lowest at the edges of the distribution. Variants of the CPH include the ‘Ramped North' (
Daniel Cárcamo, Mailiu Díaz Peña, Jonathan P. A. Gardner   +2 more
wiley   +1 more source

Seasonal migration patterns of Siberian Rubythroat (Calliope calliope) facing the Qinghai–Tibet Plateau

Movement Ecology
Background Small songbirds respond and adapt to various geographical barriers during their annual migration. Global flyways reveal the diverse migration strategies in response to different geographical barriers, among which are high-elevation plateaus ...
Tianhao Zhao, Wieland Heim, Raphaël Nussbaumer, Mariëlle van Toor, Guoming Zhang, Arne Andersson, Johan Bäckman, Zongzhuang Liu, Gang Song, Magnus Hellström, Jacob Roved, Yang Liu, Staffan Bensch, Bregje Wertheim, Fumin Lei, Barbara Helm   +15 more
doaj   +1 more source

Waterfowl population survey of the Marcali reservoir (2007–2008). [PDF]

, 2011
This study has shown that the Marcali reservoir is an important waterbird wetland habitat espe- cially during the migration period.
Kovács, Gyula, Nagy, Ádám, Winkler, Dániel   +2 more
core