Results 41 to 50 of about 30,033 (263)

Using stable isotopes in hummingbird breath to estimate reliance on supplemental feeders

Ecology and Evolution, 2023
Understanding the ecological consequences of supplemental feeding to both hummingbirds and the plants they pollinate is complicated by logistical challenges associated with assessing relative dietary resource use with commonly applied observational ...
Nathan Wolf, T. Scott Smeltz, Craig Cook, Carlos Martinez del Rio   +3 more
doaj   +1 more source

Kinematics of hovering hummingbird flight along simulated and natural elevational gradients [PDF]

, 2003
Hovering flight is one of the most energetically demanding forms of animal locomotion. Despite the cost, hummingbirds regularly hover at high elevations, where flight is doubly challenging because of reduced air density and oxygen availability.
Altshuler, Douglas L., Dudley, Robert
core  

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

From Origami to Bistable and Laminate Structures: A Review for Multifunctional Applications from Structural Perspective of Shape‐Changing Structures

Advanced Intelligent Systems, EarlyView.
This review explores how shape‐changing structures—origami, bistable, and laminate structures—enable multifunctionality in soft robotics and metamaterials. Starting from structural design, it examines core principles, real‐world applications, and ongoing challenges.
Lingchen Kong, Yaoyao Fiona Zhao
wiley   +1 more source

Selection maintains floral color polymorphism in scarlet paintbrush, Castilleja coccinea, reflecting combined ecological factors

American Journal of Botany, EarlyView.
Abstract Premise Evolutionary theory predicts polymorphism should be rare; however, intraspecific variation in floral color is common and can be attributed to genetic drift, plasticity, or variable selection. Examining floral color polymorphism both within contact zones and across a species' range can reveal the mechanisms maintaining this variation ...
Emma Fetterly, Anna S. Braum, Chloe (Eun Sun) Kim, Katherine E. Wenzell, Mary V. Ashley, Laura Steger, Jeremie B. Fant   +6 more
wiley   +1 more source

Reproductive biology of Amasonia obovata Gleason (Laminaceae) [PDF]

Acta Amazonica, 2014
Floral mechanisms that ensure seed production via autogamy are more likely to occur in species growing in environments where pollination is scarce.
Thays de Assis Schvinn, Anderson Fernandes de Miranda, Celice Alexandre Silva   +2 more
doaj   +2 more sources

Flight Mechanics and Control of Escape Manoeuvres in Hummingbirds. II. Aerodynamic Force Production, Flight Control and Performance Limitations [PDF]

, 2016
The superior manoeuvrability of hummingbirds emerges from complex interactions of specialized neural and physiological processes with the unique flight dynamics of flapping wings.
Cheng, Bo, Chiu, George T.C., Deng, Xinyan, Hedrick, Tyson L, Powers, Donald R, Tobalske, Bret W, Wang, Yi, Wethington, Susan M   +7 more
core   +3 more sources

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

miR-Blood – a small RNA atlas of human blood components

Scientific Data
miR-Blood is a high-quality, small RNA expression atlas for the major components of human peripheral blood (plasma, erythrocytes, thrombocytes, monocytes, neutrophils, eosinophils, basophils, natural killer cells, CD4+ T cells, CD8+ T cells, and B cells).
Julia Jehn, Franziska Trudzinski, Rastislav Horos, Judith Schenz, Florian Uhle, Markus A. Weigand, Maurice Frank, Mustafa Kahraman, Marco Heuvelman, Tobias Sikosek, Timothy Rajakumar, Jennifer Gerwing, Jasmin Skottke, Alberto Daniel-Moreno, Christina Rudolf, Franziska Hinkfoth, Kaja Tikk, Petros Christopoulos, Laura V. Klotz, Hauke Winter, Michael Kreuter, Bruno R. Steinkraus   +21 more
doaj   +1 more source

A Method Combining Model Optimization Algorithm and Grey Relational Analysis for Analyzing Factors Affecting Photovoltaic Cell Output Characteristics

Energy Science &Engineering, EarlyView.
For output power, light intensity has the highest correlation, indicating that light intensity is the most sensitive factor affecting the output power of PV cells, and its changes have the most significant impact on output power. The change in temperature will lead to changes in the concentration and mobility of carrier inside the battery, which will ...
Biying Zhou, Peng Zhang
wiley   +1 more source