@article {52562,
	title = {Chronic anthropogenic noise disrupts glucocorticoid signaling and has multiple effects on fitness in an avian community},
	journal = {Proceedings of the National Academy of Sciences},
	year = {2018},
	month = {Aug-01-2018},
	pages = {201709200},
	abstract = {<p>Anthropogenic noise is a pervasive pollutant that decreases environmental quality by disrupting a suite of behaviors vital to perception and communication. However, even within populations of noise-sensitive species, individuals still select breeding sites located within areas exposed to high noise levels, with largely unknown physiological and fitness consequences. We use a study system in the natural gas fields of northern New Mexico to test the prediction that exposure to noise causes glucocorticoid-signaling dysfunction and decreases fitness in a community of secondary cavity-nesting birds. In accordance with these predictions, and across all species, we find strong support for noise exposure decreasing baseline corticosterone in adults and nestlings and, conversely, increasing acute stressor-induced corticosterone in nestlings. We also document fitness consequences with increased noise in the form of reduced hatching success in the western bluebird (Sialia mexicana), the species most likely to nest in noisiest environments. Nestlings of all three species exhibited accelerated growth of both feathers and body size at intermediate noise amplitudes compared with lower or higher amplitudes. Our results are consistent with recent experimental laboratory studies and show that noise functions as a chronic, inescapable stressor. Anthropogenic noise likely impairs environmental risk perception by species relying on acoustic cues and ultimately leads to impacts on fitness. Our work, when taken together with recent efforts to document noise across the landscape, implies potential widespread, noise-induced chronic stress coupled with reduced fitness for many species reliant on acoustic cues.</p>
},
	keywords = {acoustic environment, anthropogenic noise, birds, perceived predation risk, stress response},
	issn = {0027-8424},
	doi = {10.1073/pnas.1709200115},
	url = {http://www.pnas.org/lookup/doi/10.1073/pnas.1709200115https://syndication.highwire.org/content/doi/10.1073/pnas.1709200115},
	author = {Kleist, Nathan J. and Guralnick, Robert P. and Cruz, Alexander and Lowry, Christopher A. and Francis, Clinton D.}
}
@article {11295,
	title = {Asymmetrical integration of sensory information during mating decisions in grasshoppers},
	journal = {Proceedings of the National Academy of Sciences},
	year = {2014},
	abstract = {Decision-making processes, like all traits of an organism, are shaped by evolution; they thus carry a signature of the selection pressures associated with choice behaviors. The way sexual communication signals are integrated during courtship likely reflects the costs and benefits associated with mate choice. Here, we study the evaluation of male song by females during acoustic courtship in grasshoppers. Using playback experiments and computational modeling we find that information of different valence (attractive vs. nonattractive) is weighted asymmetrically: while information associated with nonattractive features has large weight, attractive features add little to the decision to mate. Accordingly, nonattractive features effectively veto female responses. Because attractive features have so little weight, the model suggests that female responses are frequently driven by integration noise. Asymmetrical weighting of negative and positive information may reflect the fitness costs associated with mating with a nonattractive over an attractive singer, which are also highly asymmetrical. In addition, nonattractive cues tend to be more salient and therefore more reliable. Hence, information provided by them should be weighted more heavily. Our findings suggest that characterizing the integration of sensory information during a natural behavior has the potential to provide valuable insights into the selective pressures shaping decision-making during evolution. },
	doi = {10.1073/pnas.1412741111},
	author = {Jan Clemens and Stefanie Kr{\"a}mer}
}
@article {11172,
	title = {Wing stridulation in a Jurassic katydid (Insecta, Orthoptera) produced low-pitched musical calls to attract females},
	journal = {Proceedings of the National Academy of Sciences},
	volume = {109},
	year = {2012},
	month = {Jun-03-2012},
	pages = {3868 - 3873},
	abstract = {<p>Behaviors are challenging to reconstruct for extinct species, particularly the nature and origins of acoustic communication. Here we unravel the song of Archaboilus musicus Gu, Engel and Ren sp. nov., a 165 million year old stridulating katydid. From the exceptionally preserved morphology of its stridulatory apparatus in the forewings and phylogenetic comparison with extant species, we reveal that A. musicus radiated pure-tone (musical) songs using a resonant mechanism tuned at a frequency of 6.4 kHz. Contrary to previous scenarios, musical songs were an early innovation, preceding the broad-bandwidth songs of extant katydids. Providing an accurate insight into paleoacoustic ecology, the low-frequency musical song of A. musicus was well-adapted to communication in the lightly cluttered environment of the mid-Jurassic forest produced by coniferous trees and giant ferns, suggesting that reptilian, amphibian, and mammalian insectivores could have also heard A. musicus\&$\#$39; song.</p>
},
	keywords = {biological asymmetry, biomechanics, bushcricket, call evolution, Tettigoniidae},
	issn = {0027-8424},
	doi = {10.1073/pnas.1118372109},
	url = {http://www.pnas.org/cgi/doi/10.1073/pnas.1118372109},
	author = {Gu, J.-J. and Fernando Montealegre-Zapata and Daniel Robert and Engel, M. S. and Qiao, G.-X. and Ren, D.}
}
