Annual gonadal cycles in birds: Modeling the effects of photoperiod on seasonal changes in GnRH-1 secretion

@article{Dawson2015AnnualGC,
  title={Annual gonadal cycles in birds: Modeling the effects of photoperiod on seasonal changes in GnRH-1 secretion},
  author={A Dawson},
  journal={Frontiers in Neuroendocrinology},
  year={2015},
  volume={37},
  pages={52-64}
}
  • A. Dawson
  • Published 1 April 2015
  • Biology
  • Frontiers in Neuroendocrinology

Photoperiodic control of GnRH-I expression in seasonal reproduction of the Eurasian tree sparrow.

  • A. S. DixitSanborlang Byrsat
  • Biology, Environmental Science
    Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology
  • 2018
TLDR
Results clearly indicate that tree sparrows are capable of fine discrimination of photoperiodic information and use day length for GnRH-I expression to control their seasonal reproduction.

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The results indicate that photoperiod sensitivity is not constraining the advancement of laying date under current environmental conditions and suggest that evolution of sensitivity to other supplementary cues is necessary to advance reproduction under global warming.

Photoperiodic regulation of reproduction in birds

TLDR
Hormones of the hypothalamus localised particularly in the paraventricular organ and lateral septal area of hypothalamus are implicated in regulation of photoperiod induced reproductive response and behaviour in seasonal breeding avian species.

GnRH and the photoperiodic control of seasonal reproduction: Delegating the task to kisspeptin and RFRP‐3

TLDR
Current understanding of the cellular, molecular and neuroendocrine players, which keep track of photoperiod and ultimately govern GnRH output and seasonal breeding are summarized.

Both Low Temperature and Shorter Duration of Food Availability Delay Testicular Regression and Affect the Daily Cycle in Body Temperature in a Songbird

  • A. Dawson
  • Biology, Medicine
    Physiological and Biochemical Zoology
  • 2018
TLDR
Both lower temperature and food restriction delayed regression, as if thePhotoperiod was shorter than it actually was, and both resulted in daily cycles in body temperature that reflected cycles under shorter photoperiods, implying that the daily cycle in bodyTemperature is possibly a common pathway through which nonphotoperiodic cues may operate.

Breeding Latitude and Annual Cycle Timing in a Songbird

TLDR
The hypothesis that migratory strategy and breeding latitude may predict differences in photoperiodic threshold for both migratory and reproductive timing is supported and contributes to the understanding of regulation of timing in annual cycles and improve predictions of how species might respond to changing environments.

Maternal photoperiodic programming enlightens the internal regulation of thyroid‐hormone deiodinases in tanycytes

TLDR
This review addresses MPP and discusses the latest findings on its impact on the thyrotrophin/deiodinase network, and a unifying scheme is suggested in which timing arises from a long‐term communication between the pars tuberalis and the hypothalamus and resultant spontaneous changes in local thyroid hormone status, independently of the pineal melatonin signal.
...

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