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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
... black-headed buntings ( Emberiza melanocephala Scopoli 1769) were procured from overwintering flock in late February, and acclimated for 1 week to captive conditions in an outdoor aviary (size=3×2.5×2.5 m) under semi-natural conditions (photoperiod, sunrise to sunset=∼11.3 h; average daytime...
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
... light in summer. Changes in photoperiod predict environmental conditions, with decreasing temperatures corresponding to the shortening of day length, and increasing temperatures and day length also coinciding. Thus, responding to changes in environmental light is an important feature of the generation...
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
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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
.... Arctic Antarctic Temperature regulation Starvation Photoperiod Circadian rhythms The polar regions (the Arctic and Antarctic) are characterized by continuous light in the summer and almost total darkness, blizzards, scarcity of food and temperatures occasionally as low as −60°C in the winter...
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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...
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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...