... for mitochondrial biogenesis, fatigue resistance and a shift to fatty acid oxidation. Using a photoperiod manipulation of captive gray catbirds ( Dumetella carolinensis ), we investigated whether SLN may play a role in coordinating the development of the migratory phenotype. In response to long-day photostimulation...

...Natalie R. Epstein; Kevin Saez; Asya Polat; Steven R. Davis; Matthew L. Aardema ABSTRACT Genes known to affect circadian rhythms (i.e. ‘clock genes’) also influence the photoperiodic induction of overwintering reproductive diapause in the northern house mosquito, Culex pipiens f. pipiens...

... Hypothalamus Muscle Photoperiod Skin Emberiza melanocephala The pervasiveness of the ability to assess and use annual photoperiodic cycle in regulation of annual life-history states (LHSs) has been identified as a central component of the metabolic and reproductive fitness across broad taxa...

... the ambient photoperiod. The objective of this study was to characterize the effects of photoperiodic variation on metabolic and reproductive traits, and the related changes in pituitary–hypothalamic gene expression in MSM mice. MSM mice were kept in long (LP) or short photoperiod (SP) for 6 weeks. Our...

... – for example, shortening day length in autumn signals that temperatures are about to drop, and the reverse occurs in the spring ( Hut and Beersma, 2011 ). However, climate change affects the photoperiod–temperature relationship and has potential negative consequences for the fitness of organisms ( Stevenson et...

.... It is therefore urgent to understand how a change in the relationship between photoperiod and temperature can affect ectotherms in these environments. We tested whether temperature affects daily rhythms of transcription in a cold-adapted salmonid using high-throughput RNA sequencing. Arctic char ( Salvelinus...

... as endpoints, we demonstrate that when animals living at 70°N are transferred from natural photoperiods in late autumn to either continuous light or continuous darkness, they undergo a conspicuous acceleration of the circannual programme. We conclude that rhythmical melatonin secretion, recommencing when...

...Anand S. Dixit; Namram S. Singh; Sanborlang Byrsat ABSTRACT Seasonal reproductive cycles of most birds are regulated by photoperiod via neuroendocrine control. Gonadotropin-inhibitory hormone (GnIH) in the hypothalamus has been reported to act as neuroendocrine integrator of photoperiodic cues...

...Elizabeth M. Schultz; Thomas P. Hahn; Kirk C. Klasing ABSTRACT An organism's investment in immune function often varies seasonally but understanding of how fluctuations in environmental conditions directly modulate investment remains limited. This experiment investigated how changes in photoperiod...

... declares no competing or financial interests. 7 8 2015 25 1 2016 © 2016. Published by The Company of Biologists Ltd 2016 Summary: Polar animals are well adapted to the hardships of polar life. Arctic Antarctic Temperature regulation Starvation Photoperiod Circadian...

... morphology, but constrains the endocrine responsiveness of the testes. Food restriction Luteinizing hormone Passerine Photoperiod Reproductive development Testosterone During prolonged periods of energy deficiency (i.e. when energy expenditure exceeds energy intake), animals prioritize...

...David Swanson; Yufeng Zhang; Jin-Song Liu; Christopher L. Merkord; Marisa O. King Seasonal phenotypic flexibility in small birds produces a winter phenotype with elevated maximum cold-induced metabolic rates (=summit metabolism, Ṁ sum ). Temperature and photoperiod are candidates for drivers...

...Israel Ben-Zaken; Abraham Haim; Abed E. Zubidat SUMMARY We tested the effects of photoperiod, water and food availability on body mass, reproductive status and arginine vasopressin receptor 1A (Avpr1a) mRNA expression in males of desert-adapted golden spiny mice, Acomys russatus . In Experiment 1...

... to disease. Sleep deprivation tends to attenuate inflammatory responses triggered by infection or exposure to endotoxin, such as bacterial lipopolysaccharide (LPS). Previous studies have demonstrated that Siberian hamsters ( Phodopus sungorus ), photoperiodic rodents, attenuate LPS-induced fever, sickness...

... may integrate information from multiple cues to fine-tune plastic responses remains largely unknown. We examined the interaction between correlated (seasonally matching) and conflicting (seasonally opposite) temperature and photoperiod cues on the acclimation of performance traits in male zebrafish...

... performance compared with steadily growing controls. Replicate experiments and photoperiod manipulations, moreover, revealed that the effects of growth rate on subsequent swimming performance were greater when the perceived time until the breeding season was shorter. These results show that the costs...

...A. Wargelius; P. G. Fjelldal; U. Nordgarden; A. Grini; C. Krossøy; S. Grotmol; G. K. Totland; T. Hansen SUMMARY Atlantic salmon ( Salmo salar L.) vertebral bone displays plasticity in structure, osteoid secretion and mineralization in response to photoperiod. Other properties of the vertebral bone...

...Barbara Helm; Ingrid Schwabl; Eberhard Gwinner SUMMARY To anticipate seasonal change, organisms schedule their annual activities by using calendrical cues like photoperiod. The use of cues must be fitted to local conditions because schedules differ between species and habitats. In complete absence...

...Anna Wargelius; Per Gunnar Fjelldal; Ulla Nordgarden; Tom Hansen SUMMARY In order to study the effects of photoperiod on fish bone, Atlantic salmon( Salmo salar L.) were exposed to two light regimes (natural and continuous light) from January until June. During the experimental period,several...

... by photoperiod, prior heat experience and the sex of the animal. We compared thermosensitivity and thermotolerance of ventilatory motor pattern generation in locusts reared under two photoperiods (12:12 and 16:8; i.e. 12 h:12 h and 16 h:8 h L:D, respectively) before and after heat shock pre-treatment (HS: 3 h...