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Keywords: photoperiod
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Journal Articles
J Exp Biol (2021) 224 (10): jeb242231.
Published: 24 May 2021
...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...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (24): jeb236109.
Published: 21 December 2020
... choice: Songbirds use temperature in the behavioral decision of when to migrate from wintering areas. Transcriptional responsiveness to temperature is a significant component of the overall adaptive strategy for spring migration. Gene expression Hypothalamus Muscle Photoperiod Skin Emberiza...
Includes: Supplementary data
Journal Articles
J Exp Biol (2020) 223 (6): jeb217687.
Published: 25 March 2020
... 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...
Journal Articles
J Exp Biol (2018) 221 (16): jeb179267.
Published: 22 August 2018
.... This possibility should be considered more thoroughly in studies addressing the environmental responses of animals. Photoperiod Climate change Xenobiotic PAS protein Stress Clock gene The light–dark cycle governs many functions of organisms. For example, because animals may be preyed upon during...
Journal Articles
J Exp Biol (2018) 221 (5): jeb170670.
Published: 12 March 2018
.... 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...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (21): 3869–3872.
Published: 1 November 2017
... 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...
Journal Articles
J Exp Biol (2017) 220 (20): 3742–3750.
Published: 15 October 2017
...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...
Journal Articles
J Exp Biol (2017) 220 (4): 722–730.
Published: 15 February 2017
...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...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (8): 1093–1105.
Published: 15 April 2016
... continuous days in summer. During the periods of alternating day and night between the periods of constant darkness and midnight sun, the length of the day may change by more than 30 min per day in places such as Svalbard, northern Greenland and Canada. These unusual aspects of the photoperiod are probably...
Journal Articles
J Exp Biol (2015) 218 (17): 2685–2693.
Published: 1 September 2015
....x Dawson , A. ( 2005 ). The effect of temperature on photoperiodically regulated gonadal maturation, regression and moult in starlings - potential consequences of climate change . Funct. Ecol.   19 , 995 - 1000 . 10.1111/j.1365-2435.2005.01061.x Dawson , A. ( 2008...
Includes: Supplementary data
Journal Articles
J Exp Biol (2014) 217 (6): 866–875.
Published: 15 March 2014
...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...
Journal Articles
J Exp Biol (2013) 216 (18): 3495–3503.
Published: 15 September 2013
...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...
Journal Articles
J Exp Biol (2013) 216 (14): 2581–2586.
Published: 15 July 2013
... 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...
Journal Articles
J Exp Biol (2010) 213 (21): 3705–3709.
Published: 1 November 2010
... 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...
Journal Articles
J Exp Biol (2010) 213 (19): 3289–3298.
Published: 1 October 2010
... 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...
Journal Articles
J Exp Biol (2010) 213 (7): 1207–1216.
Published: 1 April 2010
...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...
Journal Articles
J Exp Biol (2009) 212 (9): 1259–1269.
Published: 1 May 2009
...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...
Includes: Supplementary data
Journal Articles
J Exp Biol (2009) 212 (5): 656–661.
Published: 1 March 2009
...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...
Journal Articles
J Exp Biol (2006) 209 (23): 4690–4700.
Published: 1 December 2006
... 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...
Journal Articles
J Exp Biol (2006) 209 (19): 3786–3794.
Published: 1 October 2006
...Scott A. MacDougall-Shackleton; Madhusudan Katti; Thomas P. Hahn SUMMARY Species with different reproductive schedules may differ in how they respond to the annual change in photoperiod (the adaptive specialization hypothesis). Seasonally breeding species are predicted to use photorefractoriness...