作者: NIP 時(shí)間: 2025-3-21 23:45 作者: 600 時(shí)間: 2025-3-22 03:56
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.作者: 小故事 時(shí)間: 2025-3-22 06:13
Selection and Use of Habitat of Wintering Migrants will focus on small migrant land birds that move from high to tropical latitudes. Therefore, the term “migrants” refers to north temperate species that winter at tropical and subtropical latitudes, and the term “residents” will refer to local, tropical, resident species.作者: nutrients 時(shí)間: 2025-3-22 09:47
http://image.papertrans.cn/b/image/188845.jpg作者: 關(guān)心 時(shí)間: 2025-3-22 16:50 作者: SLAY 時(shí)間: 2025-3-22 18:42
Kapitel: Die staatliche Verwaltung will focus on small migrant land birds that move from high to tropical latitudes. Therefore, the term “migrants” refers to north temperate species that winter at tropical and subtropical latitudes, and the term “residents” will refer to local, tropical, resident species.作者: 口音在加重 時(shí)間: 2025-3-22 21:38
Kurzprofil wichtiger Medikamente, 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作者: Cholecystokinin 時(shí)間: 2025-3-23 04:10
Kurzprofil wichtiger Medikamente,exceptions, 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.作者: 虛情假意 時(shí)間: 2025-3-23 09:37 作者: 做事過(guò)頭 時(shí)間: 2025-3-23 11:50 作者: 絕食 時(shí)間: 2025-3-23 15:24 作者: 大量殺死 時(shí)間: 2025-3-23 20:07
Kapitel: Allgemeine Grundrechtslehrenive in the 1960s and 1970s when many systematic radar and visual studies of migration were done. Also, multivariate and other statistical methods became widely used, providing a partial solution to the problem of quantifying and separating the effects of interrelated weather variables on migration. 作者: archetype 時(shí)間: 2025-3-24 02:02
Kapitel: Allgemeine Grundrechtslehren in large numbers and undergo a simultaneous molt of their wing feathers, becoming flightless for several weeks. While knowledge of these assemblages of flightless birds was doubtless exploited by primitive hunters for millenia, the phenomenon of the molt migration was largely unappreciated by ornit作者: irradicable 時(shí)間: 2025-3-24 05:21
Kapitel: Verfassung und Verfassungsrechtwhether it is fruitful to continue the practice of attributing site attachment to an imprinting-like process. We then refer briefly to recent findings in the neurobiology of recognition of objects and sites in three areas of investigation: filial imprinting, relocation of food by food-caching birds,作者: 披肩 時(shí)間: 2025-3-24 10:10 作者: 有特色 時(shí)間: 2025-3-24 12:05 作者: stress-test 時(shí)間: 2025-3-24 14:51 作者: STALL 時(shí)間: 2025-3-24 22:09
Kapitel: Die staatliche Verwaltungs, such as those migrating into harsh, arctic environments, the brief summer flush of productivity and the intolerable conditions at other times of year offer an obvious explanation superficially requiring little further study. For other species early work, by biologists resident in the temperate zo作者: plasma-cells 時(shí)間: 2025-3-24 23:39 作者: 背書(shū) 時(shí)間: 2025-3-25 04:56 作者: allergen 時(shí)間: 2025-3-25 10:28
Kapitel: Verfassung und Verfassungsrecht Perkinson 1951; King and Farner 1956; Berthold 1976; Blem 1976, 1980; Dawson et al. 1983). The basic biochemistry, physiology, and bioenergetics of migratory fattening have been identified; yet, the regulatory mechanisms involved remain obscure. On the one hand, the behavioral and physiological fun作者: chance 時(shí)間: 2025-3-25 12:27
Kapitel: Die Gerichtsbarkeit des Bundesment of individuals from the wintering area to the breeding area) occurs during a period of gonadal development and increasing levels of reproductive hormones. Autumnal migration (the movement of individuals from the breeding area to wintering grounds) occurs after the breeding season when the gonad作者: ETCH 時(shí)間: 2025-3-25 17:00
Kapitel: Verfassung und Verfassungsrecht and homing by pigeons. We suggest that analogies between these findings and site recognition in migratory birds may indicate new directions for research. These suggestions are speculative because current knowledge is slim; we hope the speculations may have heuristic value.作者: geometrician 時(shí)間: 2025-3-25 21:37
Kapitel: Die Gerichtsbarkeit des Bundes period (e.g., Berthold 1988a). The overall winter distributions of many migrant species are well known, but detailed analyses of population structure, ecology, and physiology during this period are scarce.作者: 廢除 時(shí)間: 2025-3-26 03:48
Kapitel: Die einzelnen Grundrechtes do not (Schüz 1971). This situation is referred to as partial migration (Schüz and Meise 1968). The définition should not be used for . that migrate in part of their breeding range and are sedentary elsewhere (Terrill and Able 1988).作者: debunk 時(shí)間: 2025-3-26 04:29
wide billions of birds leave their breeding grounds every autumn to migrate to areas with seasonally more favor- able conditions. Many of these migrants travel only over a few hundred kilo- meters but others cover distances equivalent to the circumference of the earth. Among these long-distance migr作者: 整潔 時(shí)間: 2025-3-26 09:20
Kurzprofil wichtiger Medikamente,w hundred kilometers but others cover distances equivalent to the circumference of the earth. Among these long-distance migrants are several billion birds that invade Africa every autumn from their West and Central Palaearctic breeding areas. In the Americas and in Asia the scope of bird migration is of a similar magnitude.作者: 拘留 時(shí)間: 2025-3-26 15:12 作者: 南極 時(shí)間: 2025-3-26 19:06
Kapitel: Allgemeine Grundrechtslehrenme widely used, providing a partial solution to the problem of quantifying and separating the effects of interrelated weather variables on migration. Work up to 1977 was reviewed by Richardson (1978a), hereafter cited as R78a.作者: 專(zhuān)橫 時(shí)間: 2025-3-27 00:20
Kapitel: Die einzelnen Grundrechteight (Martin 1990). How diurnal birds cope with occasional nocturnal activity is not well understood, but in view of the restricted life-style of truly nocturnal birds (Martin 1986a), it is perhaps surprising to find that otherwise strictly diurnal birds are able to undertake their migratory flights at night.作者: A簡(jiǎn)潔的 時(shí)間: 2025-3-27 01:50 作者: DIKE 時(shí)間: 2025-3-27 09:06 作者: 黑豹 時(shí)間: 2025-3-27 11:59
Timing of Bird Migration in Relation to Weather: Updated Reviewme widely used, providing a partial solution to the problem of quantifying and separating the effects of interrelated weather variables on migration. Work up to 1977 was reviewed by Richardson (1978a), hereafter cited as R78a.作者: MILK 時(shí)間: 2025-3-27 17:40 作者: Mucosa 時(shí)間: 2025-3-27 19:20
Site Attachment and Site Fidelity in Migratory Birds: Experimental Evidence from the Field and Analo and homing by pigeons. We suggest that analogies between these findings and site recognition in migratory birds may indicate new directions for research. These suggestions are speculative because current knowledge is slim; we hope the speculations may have heuristic value.作者: 牲畜欄 時(shí)間: 2025-3-27 23:51 作者: Cuisine 時(shí)間: 2025-3-28 05:37 作者: 古文字學(xué) 時(shí)間: 2025-3-28 08:54 作者: FUSE 時(shí)間: 2025-3-28 10:58
Kapitel: Die staatliche Verwaltungpecies of tropical origin only temporarily visiting these breeding grounds (see review in Morse 1980). The importance of reproduction and survival rates and of migration costs in the evolution of migration has also received greater attention recently (Ketterson and Nolan 1976, 1983; Fretwell 1972, 1985; Greenberg 1980; O’Connor 1981, 1985).作者: 作繭自縛 時(shí)間: 2025-3-28 17:16 作者: AROMA 時(shí)間: 2025-3-28 21:53 作者: OFF 時(shí)間: 2025-3-29 00:55
Some Ecological Aspects of Migrants and Residentspecies of tropical origin only temporarily visiting these breeding grounds (see review in Morse 1980). The importance of reproduction and survival rates and of migration costs in the evolution of migration has also received greater attention recently (Ketterson and Nolan 1976, 1983; Fretwell 1972, 1985; Greenberg 1980; O’Connor 1981, 1985).作者: Abominate 時(shí)間: 2025-3-29 04:30
Nutrition and Food Selection in Migratory Birdsng migrants must choose from a broad range of foods differing in morphology and nutrient contents. In this chapter, I will review nutritional adaptations and aspects of food selection in migrants which appear to correspond to their migratory requirements.作者: 的闡明 時(shí)間: 2025-3-29 09:12 作者: APEX 時(shí)間: 2025-3-29 14:00 作者: GRE 時(shí)間: 2025-3-29 16:20
Kapitel: Allgemeine Grundrechtslehrenolting 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.作者: 激怒 時(shí)間: 2025-3-29 20:14 作者: BALK 時(shí)間: 2025-3-30 00:27
Kapitel: Die Gerichtsbarkeit des Bundesstates 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.作者: 奇思怪想 時(shí)間: 2025-3-30 04:44 作者: fluffy 時(shí)間: 2025-3-30 11:23
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.作者: Hemiplegia 時(shí)間: 2025-3-30 16:22
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作者: defibrillator 時(shí)間: 2025-3-30 18:09
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.作者: conceal 時(shí)間: 2025-3-30 23:57 作者: Terrace 時(shí)間: 2025-3-31 04:17 作者: conjunctivitis 時(shí)間: 2025-3-31 07:47
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作者: expound 時(shí)間: 2025-3-31 13:11
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.作者: Misnomer 時(shí)間: 2025-3-31 16:51
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; 作者: emission 時(shí)間: 2025-3-31 17:43
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作者: gruelling 時(shí)間: 2025-3-31 22:35 作者: 壯觀的游行 時(shí)間: 2025-4-1 02:51
Timing of Bird Migration in Relation to Weather: Updated Reviewive in the 1960s and 1970s when many systematic radar and visual studies of migration were done. Also, multivariate and other statistical methods became widely used, providing a partial solution to the problem of quantifying and separating the effects of interrelated weather variables on migration. 作者: Debrief 時(shí)間: 2025-4-1 08:21
Aspects of the Molt Migration in large numbers and undergo a simultaneous molt of their wing feathers, becoming flightless for several weeks. While knowledge of these assemblages of flightless birds was doubtless exploited by primitive hunters for millenia, the phenomenon of the molt migration was largely unappreciated by ornit作者: 蹣跚 時(shí)間: 2025-4-1 12:51 作者: Nebulous 時(shí)間: 2025-4-1 17:53
Ecophysiological Aspects of Movements by Migrants in the Wintering Quartersal migration (Helms 1963). Each phase comprises distinct physiological and behavioral characteristics and each has unique properties with respect to the complex life histories of migrants. In general, more research emphasis has been placed on the breeding and migration periods compared to the winter
