Results 71 to 80 of about 203,887 (302)

Migratory microbiomes: the role of the gut microbiome in bird migration eco‐physiology

Journal of Avian Biology
Long‐distance bird migration is one of the most metabolically and immunologically challenging feats in the animal kingdom, with birds often needing to double their weight in a matter of days and facing increased exposure to novel pathogens.
Pablo Capilla‐Lasheras, Alice Risely
doaj   +1 more source

Radar studies of bird migration [PDF]

Observations of bird migration with NASA radars were made at Wallops Island, Va. Simultaneous observations were made at a number of radar sites in the North Atlantic Ocean in an effort to discover what happened to those birds that were observed leaving ...
Williams, J. M., Williams, T. C.
core   +1 more source

Bird Migration Through A Mountain Pass Studied With High Resolution Radar, Ceilometers, And Census [PDF]

, 2001
Autumnal migration was studied with high-resolution radar, ceilometer, and daily census in the area of Franconia Notch, a major pass in the northern Appalachian Mountains.
Stokstad, P., Williams, J. M., Williams, P. G., Williams, Timothy C., , \u2764   +3 more
core   +2 more sources

Ontogenetic changes and sexual dimorphism in the cranium and mandible of the Atlantic walrus (Odobenus rosmarus rosmarus L.)

The Anatomical Record, EarlyView.
Abstract Walruses have been an important subsistence and cultural resource for humans and have been exploited for millennia across their distribution. This exploitation has contributed to severe declines in several populations and local extirpations.
Katrien Dierickx, Oliver Kersten, Youri van den Hurk, Brenna A. Frasier, Richard Sabin, Bastiaan Star, James H. Barrett   +6 more
wiley   +1 more source

Arrival and Peak Abundance of Barn Swallows Hirundo rustica in Three Regions of South Africa in Relation to Climate Indices, Deduced from Bird Atlas Data

Birds
For three regions of South Africa (Greater Gauteng, Greater Cape Town and Greater Durban) with the greatest coverage by bird atlas (SABAP2) fieldwork, we related arrival timing and abundance in each region of a long-distance migrant bird, the Barn ...
Les G. Underhill, Magdalena Remisiewicz
doaj   +1 more source

Winter Conditions Influence Biological Responses of Migrating Hummingbirds

, 2016
Conserving biological diversity given ongoing environmental changes requires the knowledge of how organisms respond biologically to these changes; however, we rarely have this information. This data deficiency can be addressed with coordinated monitoring
Burnham K. P., Calder W. A., Newton I., Pyle P., R Core Team, Russell S. M., Stiles F. G., Stiles F. G., Zimmerman M.   +8 more
core   +1 more source

Early Pliocene Varanus (Squamata, Varanidae) remains from Megalo Emvolon, Thessaloniki, Greece

The Anatomical Record, EarlyView.
The article describes new cranial and postcranial varanid material from Megalo Emvolon Lower Pliocene vertebrate fossil site near Thessaloniki. The fossils, likely representing a single individual, are referred to Varanus cf. marathonensis. Abstract This study describes new fossil varanid material from a recently discovered fossil spot (MVL site) at ...
Chara Drakopoulou, Georgios L. Georgalis, Georgios Lazaridis, Dimitris S. Kostopoulos   +3 more
wiley   +1 more source

Climate in Europe and Africa Sequentially Shapes the Spring Passage of Long-Distance Migrants at the Baltic Coast in Europe

Diversity
Since the 1980s, earlier European springs have led to the earlier arrival of migrant passerines. We predict that arrival is related to a suite of climate indices operating during the annual cycle (breeding, autumn migration, wintering, spring migration ...
Magdalena Remisiewicz, Les G. Underhill
doaj   +1 more source

Osteological correlates of the respiratory and vascular systems in the neural canals of Mesozoic ornithurines Ichthyornis and Janavis

The Anatomical Record, EarlyView.
Abstract In birds, the neural canal houses a variety of anatomical structures including the spinal cord, meninges, spinal vasculature, and respiratory diverticula. Among these, paramedullary diverticula and the extradural dorsal spinal vein may leave behind osteological correlates in the form of pneumatic foramina and fossae, and a bilobed geometry of ...
Jessie Atterholt, M. Grace Burton, Mathew J. Wedel, Juan Benito, Ellen Fricano, Daniel J. Field   +5 more
wiley   +1 more source

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