Effect of natural and synthetic noise on evoked vocal responses in a frog of the temperate austral forest

Penna, Mario; Pottstock, Hans; Velásquez, Nelson

doi:10.1016/j.anbehav.2004.11.022

Cited by 91 publications

(80 citation statements)

References 31 publications

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“…However, temporal changes of a call can make it more perceptible and reduce the intra-or interspecific acoustic interference in complex choruses (Bastos and Haddad, 1995;Bee et al, 2001;Penna et al, 2005;Bastos et al, 2011). In S. constrictus, acoustic parameters did not vary among the years, most likely due to a low amount of genetic exchange between the populations, which would keep acoustic param eters similar among breeding seasons.…”

Section: Discussionmentioning

confidence: 97%

Individual variation in the advertisement calls of a Neotropical treefrog (Scinax constrictus)

Gambale

Signorelli

2014

Amphib Reptilia

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A bstract. Studies of the variability of signals at different levels are important to resolve issues related to the evolution of a species' recognition system. We analysed the variation within males, among individuals, and among three breeding seasons in the advertisement calls of Scinax constrictus, a Neotropical hylid frog endemic to the Cerrado of Brazil. We assessed the influence of different temperature ranges and different body condition ranges over a three-year period of breeding season on the acoustical features of the advertisement calls of 62 individuals. Air temperature had negative relationship with call duration and note number. Body condition had a negative relationship with the dominant frequency and positive effects on pulse number and note duration. The acoustic parameters of S. constrictus were stable across breeding seasons. Temporal parameters were highly variable within individuals, whereas the dominant frequency was the most stereotyped property of advertisement calls. Individuals of S. constrictus have sufficient among-male variability, especially for temporal parameters (call duration, number of notes, and note duration), to permit discrimination between conspecific calling males at a reproductive site by statistical analysis. The results highlight the informativeness of non-invasive bioacoustic features for population-level studies and biological conservation.

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Section: Discussionmentioning

confidence: 97%

Individual variation in the advertisement calls of a Neotropical treefrog (Scinax constrictus)

Gambale

Signorelli

2014

Amphib Reptilia

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“…480 to 860 Hz in average; L. pipiens: from 850 to 1200 Hz at average; Cunnington & Fahrig 2010). Penna et al (2005) showed that Eupsophus calcaratus increased call duration and call rate in response to abiotic background noise (wind, rain, creek and sea surf), and they suggested these vocal responses are adaptations that allow frogs to cope with high interference with sounds produced by the local acoustic environment.…”

Section: Social Context and Acoustic Environmentmentioning

confidence: 99%

The use of bioacoustics in anuran taxonomy: theory, terminology, methods and recommendations for best practice

Köhler

Jansen

Rodríguez³

et al. 2017

Zootaxa

459

410

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Vocalizations of anuran amphibians have received much attention in studies of behavioral ecology and physiology, but also provide informative characters for identifying and delimiting species. We here review the terminology and variation of frog calls from a perspective of integrative taxonomy, and provide hands-on protocols for recording, analyzing, comparing, interpreting and describing these sounds. Our focus is on advertisement calls, which serve as premating isolation mechanisms and, therefore, convey important taxonomic information. We provide recommendations for terminology of frog vocalizations, with call, note and pulse being the fundamental subunits to be used in descriptions and comparisons. However, due to the complexity and diversity of these signals, an unequivocal application of the terms call and note can be challenging. We therefore provide two coherent concepts that either follow a note-centered approach (defining uninterrupted units of sound as notes, and their entirety as call) or a call-centered approach (defining uninterrupted units as call whenever they are separated by long silent intervals) in terminology. Based on surveys of literature, we show that numerous call traits can be highly variable within and between individuals of one species. Despite idiosyncrasies of species and higher taxa, the duration of calls or notes, pulse rate within notes, and number of pulses per note appear to be more static within individuals and somewhat less affected by temperature. Therefore, these variables might often be preferable as taxonomic characters over call rate or note rate, which are heavily influenced by various factors. Dominant frequency is also comparatively static and only weakly affected by temperature, but depends strongly on body size. As with other taxonomic characters, strong call divergence is typically indicative of species-level differences, whereas call similarities of two populations are no evidence for them being conspecific. Taxonomic conclusions can especially be drawn when the general advertisement call structure of two candidate species is radically different and qualitative call differences are thus observed. On the other hand, quantitative differences in call traits might substantially vary within and among conspecific populations, and require careful evaluation and analysis. We provide guidelines for the taxonomic interpretation of advertisement call differences in sympatric and allopatric situations, and emphasize the need for an integrative use of multiple datasets (bio-acoustics, morphology, genetics), particularly for allopatric scenarios. We show that small-sized frogs often emit calls with frequency components in the ultrasound spectrum, although it is unlikely that these high frequencies are of biological relevance for the majority of them, and we illustrate that detection of upper harmonics depends also on recording distance because higher frequencies are attenuated more strongly. Bioacoustics remains a prime approach in integrative taxonomy of anurans if uncertainty due to possible intraspecific variation and technical artifacts is adequately considered and acknowledged.

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“…Daily and seasonal changes in climate conditions, such as temperature and wind, can also result in concordant patterns across modalities [17,27]. Wind, for instance, can result in higher noise levels, more substrate vibrations and increased visual motion, thus simultaneously affecting multiple senses [28][29][30]. Multimodal covariance may also occur across space.…”

Section: Environmental Sensory Conditions and Covariance Among Modalimentioning

confidence: 99%

Pollution going multimodal: the complex impact of the human-altered sensory environment on animal perception and performance

2015

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Anthropogenic sensory pollution is affecting ecosystems worldwide. Human actions generate acoustic noise, emanate artificial light and emit chemical substances. All of these pollutants are known to affect animals. Most studies on anthropogenic pollution address the impact of pollutants in unimodal sensory domains. High levels of anthropogenic noise, for example, have been shown to interfere with acoustic signals and cues. However, animals rely on multiple senses, and pollutants often co-occur. Thus, a full ecological assessment of the impact of anthropogenic activities requires a multimodal approach. We describe how sensory pollutants can co-occur and how covariance among pollutants may differ from natural situations. We review how animals combine information that arrives at their sensory systems through different modalities and outline how sensory conditions can interfere with multimodal perception. Finally, we describe how sensory pollutants can affect the perception, behaviour and endocrinology of animals within and across sensory modalities. We conclude that sensory pollution can affect animals in complex ways due to interactions among sensory stimuli, neural processing and behavioural and endocrinal feedback. We call for more empirical data on covariance among sensory conditions, for instance, data on correlated levels in noise and light pollution. Furthermore, we encourage researchers to test animal responses to a full-factorial set of sensory pollutants in the presence or the absence of ecologically important signals and cues. We realize that such approach is often time and energy consuming, but we think this is the only way to fully understand the multimodal impact of sensory pollution on animal performance and perception.

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Effect of natural and synthetic noise on evoked vocal responses in a frog of the temperate austral forest

Cited by 91 publications

References 31 publications

Individual variation in the advertisement calls of a Neotropical treefrog (Scinax constrictus)

Individual variation in the advertisement calls of a Neotropical treefrog (Scinax constrictus)

The use of bioacoustics in anuran taxonomy: theory, terminology, methods and recommendations for best practice

Pollution going multimodal: the complex impact of the human-altered sensory environment on animal perception and performance

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