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Disruption of energy homeostasis by food restriction or high ambient temperature exposure affects gonadal function in male house finches (Haemorhous mexicanus)

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Abstract

Reproductive success requires that individuals acquire sufficient energy resources. Restricting food availability or increasing energy expenditure (e.g., thermoregulation) inhibits reproductive development in multiple avian species, but the nature of the energy-related signal mediating this effect is unclear. To investigate this question, we examined reproductive and metabolic physiology in male house finches that either underwent moderate food restriction (FR) or were exposed to high temperature (HT), in which birds were held at a high, but not locally atypical, ambient temperature cycle (37.8 °C day, 29.4 °C night) compared to a control group (CT; 29.4 °C day, 21.1 °C night). We hypothesized that FR and HT inhibit reproductive development by lowering available metabolic fuel, in particular plasma glucose (GLU) and free fatty acids (FFA). Following FR for 4 weeks, finches lost body mass, had marginally higher plasma FFA, and experienced a 90% reduction in testis mass compared to CT birds. Four weeks of HT exposure resulted in reduced voluntary food consumption and muscle mass, as well as an 80% reduction in testis mass relative to CT birds. Both FR and HT birds expressed less testicular 17β-hydroxysteroid dehydrogenase (17β-HSD) mRNA than controls but the expression of other testicular genes measured was unaffected by either treatment. Neither treatment significantly influenced plasma GLU. This study is among the first to demonstrate a negative effect of HT on reproductive development in a wild bird. Further studies are needed to clarify the role of metabolic mediators and their involvement under various conditions of energy availability and demand.

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Data availability

The datasets generated during and analyzed during the current study are available in the Mendeley Data repository, https://dx.doi.org/10.17632/p2xmrvrf9t.1.

Abbreviations

17β-HSD:

17β-Hydroxysteroid dehydrogenase

ANOVA:

Analysis of variance

AL:

Ad libitum

CP:

Cloacal protuberance

CORT:

Corticosterone

FR:

Food-restricted

FFA:

Free fatty acids

FSHR:

Follicle-stimulating hormone receptor

GLU:

Glucose

GnIH:

Gonadotropin-inhibitory hormone

GR:

Glucocorticoid receptor

GSI:

Gonadosomatic index

HPG:

Hypothalamic-pituitary–gonadal

HSP60:

Heat shock protein 60

HSP70:

Heat shock protein 70

HT:

High temperature

LHR:

Luteinizing hormone receptor

MR:

Mineralocorticoid receptor

StAR:

Steroid acute regulatory protein

T:

Testosterone

TNZ:

Thermoneutral zone

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Acknowledgements

We thank Kevin McGraw, Miles Orchinik, Catherine Propper, and Karen Sweazea for providing helpful comments on drafts of the manuscript. This work was supported by the National Science Foundation under grant number DEB-1832016, Central Arizona-Phoenix Long-Term Ecological Research Program (CAP LTER), and under grant number IOB 1026620 to PD.

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SV and PD contributed to the study conception and design. SV, DE, and NK performed experimental manipulations, collected blood samples, and conducted behavioral analyses. SV performed morphological measurements, and conducted plasma assays, qPCR, and statistical analyses. SV and PD drafted the manuscript.

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Correspondence to Shelley Valle.

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The authors declare that they have no conflict of interest.

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All procedures were approved by the Arizona State University Institutional Animal Care and Use Committee (Protocol #15-1414R). All necessary permits to capture animals were obtained from the US Fish and Wildlife Service and the Arizona Game and Fish Department.

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Communicated by K. H. Dausmann.

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Valle, S., Eagleman, D., Kieffer, N. et al. Disruption of energy homeostasis by food restriction or high ambient temperature exposure affects gonadal function in male house finches (Haemorhous mexicanus). J Comp Physiol B 190, 611–628 (2020). https://doi.org/10.1007/s00360-020-01295-0

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