Traffic noise correlates with calling time but not spatial distribution in the threatened poison frog Andinobates bombetes

Vargas‐Salinas, Fernando; Amézquita, Adolfo

doi:10.1163/1568539x-00003068

Cited by 32 publications

(19 citation statements)

References 42 publications

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“…(); [49] Bee & Swanson (); [50] Cunnington & Fahrig (); [51] Lampe et al . (); [52] Vargas‐Salinas & Amézquita (); [53] Francis, Ortega, & Cruz (2011 a ); [54] Blickley et al . (2012 b ); [55] Schroeder et al .…”

Section: Identifying Noise Levels That Elicit a Biological Responsementioning

confidence: 99%

A synthesis of two decades of research documenting the effects of noise on wildlife

et al. 2015

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Global increases in environmental noise levels - arising from expansion of human populations, transportation networks, and resource extraction - have catalysed a recent surge of research into the effects of noise on wildlife. Synthesising a coherent understanding of the biological consequences of noise from this literature is challenging. Taxonomic groups vary in auditory capabilities. A wide range of noise sources and exposure levels occur, and many kinds of biological responses have been observed, ranging from individual behaviours to changes in ecological communities. Also, noise is one of several environmental effects generated by human activities, so researchers must contend with potentially confounding explanations for biological responses. Nonetheless, it is clear that noise presents diverse threats to species and ecosystems and salient patterns are emerging to help inform future natural resource-management decisions. We conducted a systematic and standardised review of the scientific literature published from 1990 to 2013 on the effects of anthropogenic noise on wildlife, including both terrestrial and aquatic studies. Research to date has concentrated predominantly on European and North American species that rely on vocal communication, with approximately two-thirds of the data set focussing on songbirds and marine mammals. The majority of studies documented effects from noise, including altered vocal behaviour to mitigate masking, reduced abundance in noisy habitats, changes in vigilance and foraging behaviour, and impacts on individual fitness and the structure of ecological communities. This literature survey shows that terrestrial wildlife responses begin at noise levels of approximately 40 dBA, and 20% of papers documented impacts below 50 dBA. Our analysis highlights the utility of existing scientific information concerning the effects of anthropogenic noise on wildlife for predicting potential outcomes of noise exposure and implementing meaningful mitigation measures. Future research directions that would support more comprehensive predictions regarding the magnitude and severity of noise impacts include: broadening taxonomic and geographical scope, exploring interacting stressors, conducting larger-scale studies, testing mitigation approaches, standardising reporting of acoustic metrics, and assessing the biological response to noise-source removal or mitigation. The broad volume of existing information concerning the effects of anthropogenic noise on wildlife offers a valuable resource to assist scientists, industry, and natural-resource managers in predicting potential outcomes of noise exposure.

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Section: Identifying Noise Levels That Elicit a Biological Responsementioning

confidence: 99%

A synthesis of two decades of research documenting the effects of noise on wildlife

et al. 2015

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“…Studies in other taxa also show that species adapted to live in humid habitats are able to colonize dry habitats in areas alongside streams ( e.g., Defler & Rodríguez , Meave ). The abundance and distribution of individuals of A. bombetes could be affected by the presence/absence of bromeliads (Vargas‐Salinas & Amézquita ); in our study locations, however, bromeliads were present both near and away from streams.…”

Section: Discussionmentioning

confidence: 65%

“…However, road noise was not spatially organized with respect to the streams we studied, but rather was perpendicular to our reference stream and transects. Road noise does not affect spatial distribution of A. bombetes (Vargas‐Salinas & Amézquita ), and was only detectable near a transect edge. Thus, we find it unlikely that the high‐frequency pattern we observed in these two localities reflects underlying adaptations to road noise.…”

Section: Discussionmentioning

confidence: 96%

“…Hence, noise sources other than streams should not be considered a directional selection pressure (Ord & Martins , Erdtmann & Amézquita ). Road traffic noise was detectable in RD and D1, and like stream noise, road noise is characterized by higher energy content at lower frequencies (Slabbekoorn & Peet , Brumm , Vargas‐Salinas & Amézquita ). However, road noise was not spatially organized with respect to the streams we studied, but rather was perpendicular to our reference stream and transects.…”

Section: Discussionmentioning

confidence: 99%

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Microclimate and Stream Noise Predict Geographic Divergence in the Auditory Signal of a Threatened Poison Frog

2014

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According to the acoustic adaptation hypothesis, abiotic noise generated by streams should promote the evolution of high‐pitched signals in acoustically communicating animals. The putatively selective effect is best demonstrated by studying trait–environment correlations across recently or currently diverging lineages, and when we understand the ecological interactions that underlie the selective pressures. We studied microclimate, frog distribution, abiotic noise, and the frequency of the advertisement call of the Andean poison frog Andinobates bombetes across variable environmental clines at five localities. Our general hypothesis involves three steps: microclimatic clines determine frogs’ distribution, which in turn is associated with different levels of abiotic noise that select for differentially pitched calls. Microclimate changed more abruptly with distance to streams in comparatively dry localities. There, frogs were more aggregated alongside streams and, in turn, experienced higher levels of abiotic noise. As predicted, frogs living alongside streams in dry forests called at higher frequencies, and thus attained comparable signal‐to‐noise ratios, compared with stream‐away frogs. Our data support a role for microclimate in determining frog distribution and thereby the noise conditions that promoted a divergence in a mate‐recognition signal.

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“…Models were positioned at random within each row, as long as two models of the same morph were not together. In addition, the distance between models was 1–1.5 m, following the observed spatial distribution of A. bombetes in the wild (Vargas‐Salinas & Amézquita, ; Vargas‐Salinas, Dorado‐Correa, & Amézquita, ).…”

Section: Methodsmentioning

confidence: 84%

Different colour morphs of the poison frog Andinobates bombetes (Dendrobatidae) are similarly effective visual predator deterrents

2018

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Aposematism is the use of warning signals to advertise unpleasant or dangerous defences to potential predators. As the effectiveness of this strategy depends on predator learning, little variation is expected in aposematic warning signals, as similar signals facilitate predator learning. However, warning signals are frequently variable in aposematic species. Such variability could arise as a result of geographic variation in the interpretation that local predators give warning signals. We tested this divergent learning hypothesis in the polytypic poison frog Andinobates bombetes (Anura: Dendrobatidae), focusing on visual predators. Our study was conducted in two populations of this species located in the Western Andes of Colombia, where individuals at some localities exhibit red dorsolateral stripes, while those in others exhibit yellow dorsolateral stripes. We deployed paraffin models imitating both forms of A. bombetes in size and colouration, as well as dull‐coloured controls, at sites inhabited by either red‐striped or yellow‐striped frogs. Red and yellow models were attacked at similar rates at both sites, and brown models were attacked more frequently at one of the sites. These results suggest that red and yellow colourations function as similarly effective aposematic signals for primarily visual predators, regardless of the form previously experienced by these predators. Therefore, our results do not support the hypothesis of divergent predator learning as a driver of the polytypism present in this species. Finally, we discuss other mechanisms that may be involved in the evolution and maintenance of this polytypism.

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Traffic noise correlates with calling time but not spatial distribution in the threatened poison frog Andinobates bombetes

Cited by 32 publications

References 42 publications

A synthesis of two decades of research documenting the effects of noise on wildlife

A synthesis of two decades of research documenting the effects of noise on wildlife

Microclimate and Stream Noise Predict Geographic Divergence in the Auditory Signal of a Threatened Poison Frog

Different colour morphs of the poison frog Andinobates bombetes (Dendrobatidae) are similarly effective visual predator deterrents

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