Results 21 to 30 of about 246,250 (308)
The Effect of Dietary Energy and Protein Levels on Production in Breeding Female Ostriches. [PDF]
, 2003 1. In a study spanning two breeding seasons, we assessed the effect of different dietary energy and protein levels on body mass, body condition, and egg production of female ostriches. 2.
Brand, T.S., Brand, Z., Brown, Chris
core +2 more sources
Using marine isoscapes to infer movements of oceanic migrants: The case of Bulwer's petrel, Bulweria bulwerii, in the Atlantic Ocean. [PDF]
PLoS ONE, 2018 Studying the movements of oceanic migrants has been elusive until the advent of several tracking devices, such as the light-level geolocators. Stable isotope analysis (SIA) offers a complementary approach to infer areas used year-round, but its ...
Marta Cruz-Flores +3 more
doaj +1 more source
Insect ectoparasites on wild birds in the Czech Republic during the pre-breeding period
Parasite, 2011 Wild passerine birds (Passeriformes) from the northeastern part of the Czech Republic were examined for ectoparasites during the pre-breeding period in 2007. Two species of fleas of the genera Ceratophyllus and Dasypsyllus (Siphonaptera: Ceratophyllidae),
Sychra O. +4 more
doaj +1 more source
Movement Ecology, 2022 Background To understand life-history strategies in migratory bird species, we should focus on migration behaviour and possible carry-over effects on both population and individual level.
Arndt H. J. Wellbrock, Klaudia Witte
doaj +1 more source
Animals, 2021 Among the most rapidly declining birds in continental North America, grassland birds evolved with American bison (Bison bison) until bison nearly became extinct due to overhunting.
Rachel H. Kaplan +6 more
doaj +1 more source
Geographic variation in morphometrics, molt, and migration suggests ongoing subspeciation in Pacific Golden-Plovers (Pluvialis fulva) [PDF]
, 2015 Breeding Pacific Golden-Plovers (Pluvialis fulva) cover 140 longitudinal degrees of Arctic tundra. Having examined 557 museum skins from across this huge distributional range, we conclude that Pacific Golden-Plovers breeding in Alaska are structurally ...
Jukema, J., Piersma, T., Van Rhijn, J.G.
core +1 more source
Frontiers in Genetics, 2023 Introduction: Aging is a multifactorial process that includes molecular changes such as telomere shortening. Telomeres shorten progressively with age in vertebrates, and their shortening rate has a significant role in determining the lifespan of a ...
Angélica Domínguez-de-Barros +10 more
doaj +1 more source
Massachusetts Breeding Bird Atlas [PDF]
The Auk, 2005 Abstract The following critiques express the opinions of the individual evaluators regarding the strengths, weaknesses, and value of the books they review. As such, the appraisals are subjective assessments and do not necessarily reflect the opinions of the editors or any official policy of the American Ornithologists’ Union.
openaire +1 more source
Avian Conservation and EcologyQuantifying migratory connectivity and annual movement is key to sound conservation planning for migratory species. Hermit Warblers ( Setophaga occidentalis ) are an endemic-breeding species in the Pacific Northwest that winters in Mexico and the Central
Hankyu Kim +7 more
doaj +1 more source
Frontiers in Ecology and Evolution, 2022 Global changes are inducing migratory birds to advance their annual cycle. However, changes in the time of arrival at their breeding grounds have significant fitness implications.
Mohammed Athamnia +13 more
doaj +1 more source