Search Results - "Gwinner, E."

Slow pace of life in tropical sedentary birds: a common-garden experiment on four stonechat populations from different latitudes by Wikelski, M., Spinney, L., Schelsky, W., Scheuerlein, A., Gwinner, E.

“…It has been hypothesized that organisms living at different latitudes or in different environments adjust their metabolic activity to the prevailing…”
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Genetic and phenotypically flexible components of seasonal variation in immune function by Versteegh, M A, Helm, B, Kleynhans, E J, Gwinner, E, Tieleman, B I

“…Animals cope with seasonal variation in environmental factors by adjustments of physiology and life history. When seasonal variation is partly predictable,…”
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Complex bird clocks by Gwinner, Eberhard, Brandstatter, Roland

“…conditions in midsummer or for allowing birds to adjust quickly their circadian system to changing environmental conditions during migratory seasons. The…”
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Annual cycles of metabolic rate are genetically determined but can be shifted by phenotypic flexibility by Versteegh, M A, Helm, B, Gwinner, E, Tieleman, B I

“…Birds have adjusted their life history and physiological traits to the characteristics of the seasonally changing environments they inhabit. Annual cycles in…”
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Predators as stressors? Physiological and reproductive consequences of predation risk in tropical stonechats (Saxicola torquata axillaris) by Scheuerlein, Alexander, Van't Hof, Thomas, Gwinner, Eberhard

“…Tropical birds usually lay smaller clutches and are less likely to initiate a second brood than their temperate–zone relatives. This reduction in annual…”
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Nutritional mechanisms and temporal control of migratory energy accumulation in birds by Bairlein, F. (Institut fur Vogelforschung "Vogelwarte Helgoland", Wilhelmshaven, Germany), Gwinner, E

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Circannual rhythms in birds by Gwinner, Eberhard

“…In many birds, reproduction, molt, migration and other seasonal activities are controlled by endogenous circannual rhythmicity. Under constant conditions, this…”
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Hippocampal volume in migratory and non-migratory warblers: effects of age and experience by Healy, S.D., Gwinner, E., Krebs, J.R.

“…We tested the hypothesis that experience of migration from Europe to tropical Africa by Garden Warblers is associated with changes in the relative volume of…”
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Seasonal variations of in vivo and in vitro melatonin production in a passeriform bird, the house sparrow (Passer domesticus) by Brandstätter, Roland, Kumar, Vinod, Van'T Hof, Thomas J., Gwinner, Eberhard

“…Melatonin, released from the pineal gland, is an important signal within the circadian pacemaking system of passeriform birds. Until now, seasonal variations…”
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Circadian rhythms of melatonin in European starlings exposed to different lighting conditions: relationship with locomotor and feeding rhythms by Kumar, V, Gwinner, E, Van't Hof, T J

“…In passerine birds, the periodic secretion of melatonin by the pineal organ represents an important component of the pacemaker that controls overt circadian…”
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Melatonin facilitates synchronization of sparrow circadian rhythms to light by HAU, M, GWINNER, E

“…We recorded circadian locomotor activity rhythms of house sparrows (Passer domesticus) exposed to low-amplitude light-dark cycles (2:1 lux) with periods of…”
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Increased sedentariness in European Blackbirds following urbanization: A consequence of local adaptation? by Partecke, Jesko, Gwinner, Eberhard

“…Urbanization changes local environmental conditions and may lead to altered selection regimes for life history traits of organisms thriving in cities. Previous…”
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Stress and the City: Urbanization and Its Effects on the Stress Physiology in European Blackbirds by Partecke, Jesko, Schwabl, Ingrid, Gwinner, Eberhard

“…Animals colonizing cities are exposed to many novel and potentially stressful situations. There is evidence that chronic stress can cause deleterious effects…”
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Perinatal development of circadian melatonin production in domestic chicks by Zeman, M., Gwinner, E., Herichová, I., Lamošová, D., Košt'ál, L.

“…: In contrast to the situation in mammals, in which circadian melatonin production by the pineal gland does not begin until some time after birth, the…”
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Photoperiod Affects Amplitude but Not Duration of In Vitro Melatonin Production in the Ruin Lizard (Podarcis sicula) by Bertolucci, C., Wagner, G., Foà, A., Gwinner, E., Brandstätter, R.

“…The pineal gland and its major output signal melatonin have been demonstrated to play a central role in the seasonal organization of the ruin lizard Podarcis…”
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Circadian and circannual programmes in avian migration by Gwinner, E

“…In migratory birds, endogenous daily (circadian) and annual (circannual) rhythms serve as biological clocks that provide the major basis for their temporal…”
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Synchronization by low-amplitude light-dark cycles of 24-hour pineal and plasma melatonin rhythms of hatchling European starlings (Sturnus vulgaris) by Gwinner, E., Zeman, M., Klaassen, M.

“…Gwinner E, Zeman M, Klaassen M. Synchronization by low‐amplitude light‐dark cycles of 24‐hour pineal and plasma melatonin rhythms of hatchling European…”
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Exogenous Melatonin Reduces the Resynchronization Time after Phase Shifts of a Nonphotic Zeitgeber in the House Sparrow (Passer domesticus) by Abraham, U., Gwinner, E., Van't Hof, T. J.

“…Continuous melatonin administration via silastic implants accelerates the resynchronization of the circadian locomotor activity rhythm in house sparrows…”
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Jürgen Aschoff (1913-98) by Daan, S, Gwinner, E

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Frequency and Timing of Successive Broods in Captive African and European Stonechats Saxicola torquata axillaris and S. t. rubicola by König, S., Gwinner, E.

“…African Stonechats at the equator in Kenya breed only once per breeding season, whereas European Stonechats breed two or three times. To learn whether this…”
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