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Proc Biol Sci. 2018 Nov 21;285(1891). pii: 20182194. doi: 10.1098/rspb.2018.2194.

Frogs adapt to physiologically costly anthropogenic noise.

Author information

1
Department of Biology, Center for Brain, Behavior and Cognition, The Pennsylvania State University, 208 Mueller Laboratory, University Park, PA 16802, USA jennifer.tennessen@wwu.edu.
2
Department of Biology, Syracuse University, 107 College Place, Syracuse, NY 13244, USA.
3
Department of Biology, Center for Brain, Behavior and Cognition, The Pennsylvania State University, 208 Mueller Laboratory, University Park, PA 16802, USA.
4
School of Forestry and Environmental Studies, Yale University, 370 Prospect Street, New Haven, CT 06511, USA.
5
Department of Pathology, Microbiology and Immunology, Vanderbilt University School of Medicine, A-5301 Medical Center North, Nashville, TN 37232, USA.
6
Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104, USA.

Abstract

Human activities impose novel pressures on amphibians, which are experiencing unprecedented global declines, yet population-level responses are poorly understood. A growing body of literature has revealed that noise is an anthropogenic stressor that impacts ecological processes spanning subcellular to ecosystem levels. These consequences can impose novel selective pressures on populations, yet whether populations can adapt to noise is unknown. We tested for adaptation to traffic noise, a widespread sensory 'pollutant'. We collected eggs of wood frogs (Rana sylvatica) from populations from different traffic noise regimes, reared hatchlings under the same conditions, and tested frogs for differences in sublethal fitness-relevant effects of noise. We show that prolonged noise impaired production of antimicrobial peptides associated with defence against disease. Additionally, noise and origin site interacted to impact immune and stress responses. Noise exposure altered leucocyte production and increased baseline levels of the stress-relevant glucocorticoid, corticosterone, in frogs from quiet sites, but noise-legacy populations were unaffected. These results suggest noise-legacy populations have adapted to avoid fitness-relevant physiological costs of traffic noise. These findings advance our understanding of the consequences of novel soundscapes and reveal a pathway by which anthropogenic disturbance can enable adaptation to novel environments.

KEYWORDS:

anthropogenic noise; antimicrobial peptide; glucocorticoid; leucocyte; stress response; wood frog

PMID:
30464067
PMCID:
PMC6253376
[Available on 2019-11-21]
DOI:
10.1098/rspb.2018.2194

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