Search Results - "Eikenaar, Cas"

Constitutive immune function is not associated with fuel stores in spring migrating passerine birds by Ronanki, Shivani, Hegemann, Arne, Eikenaar, Cas

“…Migratory birds may either upregulate their immune system during migration as they might encounter novel pathogens or downregulate their immune system as a…”
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Corticosterone and timing of migratory departure in a songbird by Eikenaar, Cas, Müller, Florian, Leutgeb, Clara, Hessler, Sven, Lebus, Konstantin, Taylor, Philip D., Schmaljohann, Heiko

“…Bird migration entails replenishing fuel stores at stopover sites. There, individuals make daily decisions whether to resume migration, and must also decide…”
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Stopover departure decisions in songbirds: do long-distance migrants depart earlier and more independently of weather conditions than medium-distance migrants? by Packmor, Florian, Klinner, Thomas, Woodworth, Bradley K, Eikenaar, Cas, Schmaljohann, Heiko

“…Songbirds following distinct migration strategies (e.g. long- vs. short- to medium-distance migrants) often differ in their speed of migration during autumn…”
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Nocturnal departure timing in songbirds facing distinct migratory challenges by Müller, Florian, Eikenaar, Cas, Crysler, Zoe J., Taylor, Philip D., Schmaljohann, Heiko

“…1. Most migratory songbirds travel between their breeding areas and wintering grounds through a series of nocturnal flights. The timing of their departures…”
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Ghrelin, corticosterone and the resumption of migration from stopover, an automated telemetry study by Eikenaar, Cas, Hessler, Sven, Ballstaedt, Elmar, Schmaljohann, Heiko, Kaiya, Hiroyuki

“…The spectacular natural phenomenon of avian migration is evidently shaped by physical factors, but we know little about the underlying physiological…”
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Migrating birds rapidly increase constitutive immune function during stopover by Eikenaar, Cas, Hessler, Sven, Hegemann, Arne

“…Migratory flight is physiologically highly demanding and has been shown to negatively affect multiple parameters of constitutive immune function (CIF), an…”
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Corticosterone predicts nocturnal restlessness in a long-distance migrant by Eikenaar, Cas, Klinner, Thomas, Stöwe, Mareike

“…The decision made by migrating birds to stop refueling and to depart from stopover depends on cues from innate rhythms, intrinsic factors such as fuel…”
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Migratory restlessness in captive individuals predicts actual departure in the wild by Eikenaar, Cas, Klinner, Thomas, Szostek, K. Lesley, Bairlein, Franz

“…In captivity, migratory birds show increased activity during the time that they would normally migrate. The phenology and intensity of such ‘migratory…”
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Potential age differences in the migratory behaviour of a nocturnal songbird migrant during autumn and spring by Heiko Schmaljohann, Florian Müller, Thomas Klinner, Cas Eikenaar

“…In migratory songbirds, older individuals are thought to be more efficient migrants than younger individuals. Age‐specific differences in migratory efficiency…”
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Migrant blackbirds, Turdus merula, have higher plasma levels of polyunsaturated fatty acids compared to residents, but not enhanced fatty acid unsaturation index by Jensen, Johan Kjellberg, Isaksson, Caroline, Eikenaar, Cas, Andersson, Martin N.

“…Birds have been observed to have dietary preferences for unsaturated fatty acids during migration. Polyunsaturated fatty acids (PUFAs) may increase the…”
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The oxidative balance and stopover departure decisions in a medium- and a long-distance migrant by Eikenaar, Cas, Ostolani, Alessia, Brust, Vera, Karwinkel, Thiemo, Schmaljohann, Heiko, Isaksson, Caroline

“…Birds have extremely elevated metabolic rates during migratory endurance flight and consequently can become physiologically exhausted. One feature of…”
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Faster spring migration in northern wheatears is not explained by an endogenous seasonal difference in refueling rates by Eikenaar, Cas, Tsvey, Arseny, Schmaljohann, Heiko

“…A widespread phenomenon in migrant birds is that they travel faster in spring than in autumn. During migration birds spend most time at stopover sites and,…”
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Testosterone, plumage colouration and extra-pair paternity in male North-American barn swallows by Eikenaar, Cas, Whitham, Megan, Komdeur, Jan, van der Velde, Marco, Moore, Ignacio T

“…In most monogamous bird species, circulating testosterone concentration in males is elevated around the social female's fertile period. Variation in elevated…”
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The relationship between plasma steroid hormone concentrations and the reproductive cycle in the Northern Pacific rattlesnake, Crotalus oreganus by Lind, Craig M, Husak, Jerry F, Eikenaar, Cas, Moore, Ignacio T, Taylor, Emily N

“…Abstract We describe the reproductive cycle of Northern Pacific rattlesnakes ( Crotalus oreganus ) by quantifying steroid hormone concentrations and observing…”
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How do energy stores and changes in these affect departure decisions by migratory birds? A critical view on stopover ecology studies and some future perspectives by Schmaljohann, Heiko, Eikenaar, Cas

“…In birds, accumulating energy is far slower than spending energy during flight. During migration, birds spend, therefore, most of the time at stopover…”
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Understanding the ecological and evolutionary function of stopover in migrating birds by Schmaljohann, Heiko, Eikenaar, Cas, Sapir, Nir

“…ABSTRACT Global movement patterns of migratory birds illustrate their fascinating physical and physiological abilities to cross continents and oceans. During…”
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Revealing the control of migratory fueling： An integrated approach combining laboratory and field studies in northern wheatears Oenanthe oenanthe by Bairlein, Franz, Dierschke, Volker, Delingat, Julia, Eikenaar, Cas, Maggini, Ivan, Bulte, Marc, Schmaljohann, Heiko

“…Migratory birds rely on fueling prior to migratory flights. Fueling in migrants is controlled by intrinsic as well as ex- trinsic factors. From captive studies…”
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Endocrine regulation of fueling by hyperphagia in migratory birds by Eikenaar, Cas

“…To support migratory endurance flight, birds accumulate large amounts of fat by hyperphagia (fueling). Whereas the factors influencing migrants’ motivation to…”
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Migratory common blackbirds have lower innate immune function during autumn migration than resident conspecifics by Eikenaar, Cas, Hegemann, Arne

“…Animals need a well-functioning immune system to protect themselves against pathogens. The immune system, however, is costly and resource trade-offs with other…”
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Oxidative damage to lipids is rapidly reduced during migratory stopovers by Eikenaar, Cas, Winslott, Erica, Hessler, Sven, Isaksson, Caroline, Galván, Ismael

“…Most migrating birds need to stopover in between flights in order to refuel. Lately, additional purposes of stopover have been suggested, including…”
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