Abstract
We studied the effects of temperature on the photoperiodic regulation of seasonal reproduction and related events in the subtropical tree sparrow at Shillong, India. In the first experiment, one group of birds was maintained in an outdoor open aviary receiving natural photoperiod and temperature conditions, while the other group was exposed to natural photoperiod and constant temperature of 17 ± 2 °C in an outdoor closed aviary for 12 months. Although both sexes achieved peak gonadal growth at the same time (May) under the two conditions, gonadal regression and feathers molt were delayed under the temperature controlled condition. In the second experiment, the groups of birds were exposed to three different temperatures (17, 25 and 30 °C) under both long (LD-14L:10D) and short (SD-9L:15D) day lengths for 7 months. Birds showed relatively small but significant gonadal growth, darkening of bill color and feathers molt only at 30 °C under SD. However, they behaved as though they were under natural conditions and exhibited the above responses significantly at all temperatures under LD. There was delayed gonadal regression at the lower temperature (17 °C), while feathers molt delayed with increasing temperature (25, 30 °C) under LD. These results clearly indicate that temperature modulates photoperiodic seasonal responses in the tree sparrow.
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Abbreviations
- ANOVA:
-
Analysis of variance
- ASD:
-
Anand Shanker Dixit
- B:
-
Bill completely black
- BB:
-
Bill black with little straw patch left
- BC:
-
Bill color
- BF:
-
Body feathers
- BM:
-
Body mass
- CFL:
-
Compact fluorescent lamp
- DBT:
-
Department of Biotechnology
- DST:
-
Department of Science and Technology
- FD:
-
Follicular diameter
- HPG:
-
Hypothalamus–pituitary–gonadal
- IB:
-
Iadalangki Bamon
- IBM:
-
International Business Machines
- LD:
-
Long day
- NSS:
-
Namram Sushindrajit Singh
- PF:
-
Primary feathers
- S:
-
Bill straw in color
- SD:
-
Short day
- SS:
-
Bill slightly blackish in color
- SSS:
-
Bill straw in color but with a little tinge of blackness
- SPSS:
-
Statistical package for the social sciences
- TV:
-
Testicular volume
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Acknowledgements
We acknowledge the animal care committee of the Department of Zoology, North-Eastern Hill University, Shillong (permit number 1886 of 20.09.2011) for approving the procedures of the animal care used in the present study and also the Department of Forest and Environment, Government of Meghalaya, India for granting permission to capture and transport the birds and to carry out the experiments. Financial supports from the Science and Engineering Research Board—Department of Science and Technology (DST) and Department of Biotechnology (DBT), Government of India, New Delhi are gratefully acknowledged. We also wish to thank the anonymous reviewers for their valuable feedback. We are also thankful to Imsuchila Kichu, Cotton University for language editing.
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ASD conceived the ideas and designed experiments. NSS and IB collected and analysed the data. All authors contributed critically in writing the manuscript. The authors declare no conflict of interest.
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Dixit, A.S., Bamon, I. & Singh, N.S. Temperature modulates photoperiodic seasonal responses in the subtropical tree sparrow, Passer montanus. J Comp Physiol A 204, 721–735 (2018). https://doi.org/10.1007/s00359-018-1272-2
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DOI: https://doi.org/10.1007/s00359-018-1272-2