LIGHT AND SEASONAL REPRODUCTION IN ANIMALS

@article{Rowan1938LIGHTAS,
  title={LIGHT AND SEASONAL REPRODUCTION IN ANIMALS},
  author={William Rowan},
  journal={Biological Reviews},
  year={1938},
  volume={13}
}
  • W. Rowan
  • Published 1 October 1938
  • Biology, Environmental Science
  • Biological Reviews
Some fifty species of animals have provided the material for the investigations reviewed. The majority have been birds, but mammals, reptiles, amphibia, fish and invertebrates have also been used. A list is provided. 
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References

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TLDR
The migration of the fish which occurs in connection with reproduction was examined to ascertain whether it bears a relation to the reproductive cycle, and the relation between the development of these and the changes in the testis was investigated in detail.
Modification of the Sexual Cycle in Trout by Control of Light
TLDR
Fish have not received any similar attention experimentally, but as early as 1926 Rowan pointed out that the migrations of anadromous fishes might be influenced by the length of day.
The effect of captivity upon the reproductive cycle of the South African clawed toad (Xenopus laevis).
TLDR
The normal periods of ovarian growth and retrogression which occur in the toad under natural conditions can be explained on the basis of fluctuation in food supply.
LIGHT AND THE SEXUAL CYCLE OF GAME BIRDS
TLDR
It is concluded that light is a primary factor in inducing sexual activity in pheasants, quail and grouse, through the mediation of the hypophysis through the stimulation of the gonad-stimulating hormone through causes unknown.
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TLDR
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TLDR
Under natural conditions the seasonal decrease in water volume of the ponds in which Xenopus lives may induce or at least contribute to the maintenance of the retrogressive phase of ovarian activity which normally occurs.
Factors modifying egg production with special reference to seasonal changes
TLDR
Curves have been constructed of egg production grouped in 5° of latitude and the correlation with the hours of daylight at those latitudes studied and the action of light is probably connected with the activity of the anterior lobe of the pituitary.
Reproductive Rhythm in Birds
  • W. Rowan
  • Environmental Science
    Nature
  • 1928
TLDR
It was shown that in spite of extremely low temperatures, recrudescence of the gonads could thus be induced in mid-winter and it was suggested that the development of the Gonads was due directly to increasing activity made possible through daily extension of the waking hours.
Effect of Light on Reproductive Cycle of Peromyscus leucopus noveboracensis.
TLDR
Animals, trapped locally during the winter of 1934–35, were used, along with their mature offspring, and these mammals showed gametogenesis, active development of reproductive organs, libido, and oestrus several weeks in advance of the controls.
The reproductive processes of certain mammals. III.—The reproductive cycle of the male ferret
TLDR
The present investigation was undertaken in order to determine the duration of the quiescent period in the male ferret and to compare the changes in the testis tubules with those in the interstitial tissue and accessory organs.
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