Journal article
Non-photoperiodic regulation of reproductive physiology in the flexibly breeding pine siskin (Spinus pinus)
General and comparative endocrinology, Vol.178(2), pp.259-264
09/01/2012
Handle:
https://hdl.handle.net/2376/110767
PMCID: PMC3416957
PMID: 22569115
Abstract
► We examined effects of food and social cues on initiation of reproductive development. ► Access to a preferred food had a positive effect on testis size, plasma LH and affiliative behavior. ► But, access to a potential mate had no effect on reproductive development.
In order to time reproduction to coincide with favorable conditions, animals use environmental cues to up- and down-regulate the reproductive axis appropriately. Although photoperiodic cues are one of the best studied of such environmental cues, animals also attend to others such as temperature, food availability, rainfall and social cues. Such non-photic cues are expected to be particularly important for tropical species and temperate-zone species that exhibit flexible or opportunistic breeding schedules. In this study, we investigate the use of non-photic cues, specifically food availability and social cues, to time the initiation of reproductive development in the pine siskin (Spinus pinus), a temperate-zone songbird with a flexible breeding schedule. Following winter solstice, males were housed on a 12L:12D photoperiod with either access to a preferred food, a potential mate (social cue), or both. Control birds received only maintenance diet and no mate. Access to a preferred food had a significant positive effect on testis size and circulating luteinizing hormone (LH). However, we found no effect of social treatment on reproductive development. The effect of the food treatment on reproductive development did not appear to result from effects on body mass or fat, as neither measure differed across treatments. The food treatment influenced not only reproductive physiology, but also reproductive behavior in this species, as access to seeds had a positive effect on affiliation of pairs. This study demonstrates that food is a potent stimulus for the initiation of reproductive development in pine siskins.
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Details
- Title
- Non-photoperiodic regulation of reproductive physiology in the flexibly breeding pine siskin (Spinus pinus)
- Creators
- Heather E Watts - Department of Biology, Loyola Marymount University, Los Angeles, CA 90045, United StatesThomas P Hahn - Department of Neurobiology, Physiology & Behavior, University of California, Davis, CA 95616, United States
- Publication Details
- General and comparative endocrinology, Vol.178(2), pp.259-264
- Publisher
- Elsevier Inc
- Identifiers
- 99900574624601842
- Language
- English
- Resource Type
- Journal article