fluffy
发表于 2025-3-30 11:23:10
Aspects of the Molt Migrationolting area usually differed from — and might even be opposite to — that to the wintering grounds; (2) all age and sex classes might not participate, (3) molting sites were highly localized; and (4) the numbers and densities of birds involved were often higher than at any other time.
Hemiplegia
发表于 2025-3-30 16:22:54
Fat Storage and Fat Metabolism in Relation to Migration Vol.). Recently, Wingfield et al. (this Vol.) proposed a scheme for classifying environmental and endogenous factors that regulate migratory phenomenon. Specifically, vernal (spring) fattening is triggered by initial predictive factors that include an increase in photoperiod and endogenous programs
defibrillator
发表于 2025-3-30 18:09:07
Endocrine Mechanisms of Migrationstates have common requirements, e.g., for hyperphagia, fat deposition (as fuel for long flights), and migratory flight itself. Thus, it is likely that some of the regulatory mechanisms of migration will be similar in spring and autumn and others different.
conceal
发表于 2025-3-30 23:57:11
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Terrace
发表于 2025-3-31 04:17:52
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conjunctivitis
发表于 2025-3-31 07:47:56
Introduction leave their breeding grounds every autumn to migrate to areas with seasonally more favorable conditions. Many of these migrants travel only over a few hundred kilometers but others cover distances equivalent to the circumference of the earth. Among these long-distance migrants are several billion b
expound
发表于 2025-3-31 13:11:04
The Orientation of Transoceanic Migrantsexceptions, are unable to replenish their energy stores at sea and, thus, must continue their flights over the water under all conditions. They cannot stop, as birds often do over land, when conditions are unfavorable.
Misnomer
发表于 2025-3-31 16:51:51
Bird Migration in the Arctic: A Reviewom October through May, 24 h of daylight and a superabundance of food during the brief summer provides favorable breeding conditions for millions of birds. About 135 species of birds migrate there to nest. Some make the longest migrations known to science. The Arctic tern (. is the classic example;
emission
发表于 2025-3-31 17:43:53
Palaearctic Passerine Migrants in Kenya and Uganda: Temporal and Spatial Patterns of Their Movementss during the June-September rainy season, but then become progressively desiccated (Moreau 1972). This contrasts with the situation in Southeast Asia and Central America, where migrants from the East Palaearctic and Nearctic respectively find more humid environments. In Africa, therefore, migrants t
gruelling
发表于 2025-3-31 22:35:21
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