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Can conditions experienced during migration limit the population levels of birds?
I Newton - Journal of Ornithology, 2006 - Springer
Populations of migratory birds are usually considered to be limited by conditions in breeding
or wintering areas, but some might be limited by conditions encountered on migration. This …
or wintering areas, but some might be limited by conditions encountered on migration. This …
[HTML][HTML] The impacts of Ascaridia galli on performance, health, and immune responses of laying hens: new insights into an old problem
Gastrointestinal nematodes are re-emerging in countries where the popularity of free-range
poultry production systems is increasing. Amongst all gastrointestinal nematodes, Ascaridia …
poultry production systems is increasing. Amongst all gastrointestinal nematodes, Ascaridia …
Assessing Avian Diets Using Stable Isotopes I: Turnover of 13C in Tissues
Studies of birds that use stable isotopes as dietary tracers require estimates of how quickly
stable isotopes in tissues are replaced by isotopes derived from the diet. However, isotopic …
stable isotopes in tissues are replaced by isotopes derived from the diet. However, isotopic …
Assessing body condition in birds
ME Brown - Current ornithology, 1996 - Springer
Important biological concepts typically have many definitions. Body condition is no
exception; it is a multi-level phenomenon that can be defined either conceptually or …
exception; it is a multi-level phenomenon that can be defined either conceptually or …
Reconstructing avian diets using stable-carbon and nitrogen isotope analysis of egg components: patterns of isotopic fractionation and turnover
Because eggs are composed of nutrients that are ultimately derived from the diet of adult
females, the relative abundance of naturally-occurring stable isotopes of carbon and …
females, the relative abundance of naturally-occurring stable isotopes of carbon and …
Trophic relationships among seabirds in central California: combined stable isotope and conventional dietary approach
We used stable isotope analysis (SIA) and conventional techniques of diet assessment to
determine marine trophic relationships in the Gulf of the Farallones, California, with an …
determine marine trophic relationships in the Gulf of the Farallones, California, with an …
Mallard duckling growth and survival in relation to aquatic invertebrates
RR Cox Jr, MA Hanson, CC Roy, NH Euliss Jr… - The Journal of Wildlife …, 1998 - JSTOR
Identification and assessment of the relative importance of factors affecting duckling growth
and survival are essential for effective management of mallards on breeding areas. For each …
and survival are essential for effective management of mallards on breeding areas. For each …
Cyclical changes in body composition in the annual cycle and migration of the Eared Grebe Podiceps nigricollis
JR Jehl Jr - Journal of Avian Biology, 1997 - JSTOR
In changes that are among the most dramatic known for birds, Eared Grebes undergo 3-6
atrophy/hypertrophy cycles in major body constituents annually. The most pronounced takes …
atrophy/hypertrophy cycles in major body constituents annually. The most pronounced takes …
Declining scaup populations: issues, hypotheses, and research needs
The population estimate for greater (Aythya marila) and lesser (Aythya affinis) scaup
(combined) has declined dramatically since the early 1980s to record lows in 1998. The …
(combined) has declined dramatically since the early 1980s to record lows in 1998. The …
Nutrient Reserves of Lesser Scaup (Aythya Affinis) During Spring Migration in the Mississippi Flyway: A Test of the Spring Condition Hypothesis
The continental scaup population (Lesser [Aythya affinis] and Greater [A. marila] combined)
has declined markedly since 1978. One hypothesis for the population decline states that …
has declined markedly since 1978. One hypothesis for the population decline states that …