Clinal variation in anuran advertisement calls: basis for acoustic isolation?

Narins, Peter M.; Smith, Sheila L.

doi:10.1007/bf00299948

Cited by 64 publications

(46 citation statements)

References 17 publications

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“…A similar study-along the same altitudinal transect-was reported in 1986 [10], which allowed a comparison between the two datasets. We found that changes with elevation were unaltered (i.e.…”

Section: Discussionmentioning

confidence: 83%

“…When available, 95% confidence intervals are given in parentheses. The two regression lines reported for 1986 are from the digitized data (calc), and as reported in [10] [10]. They both should have been 170, the number of points reported for the co-note, rather than 131, which refers to the number of animals caught.…”

Section: Discussionmentioning

confidence: 99%

“…The study site and the calculated call metrics are the same as those reported by a previous study done 23 years earlier [10]. The original data from 1983 to 1984 are no longer availablethey were destroyed by a flood.…”

Section: (D) Comparison With 1983-1984 Datamentioning

confidence: 99%

“…It was suggested that the animal's body size, conditioned by the calling site temperature, determines both the frequencies of the emitted calls and the highest sensitivity of the inner ear [11]. In 2006, we recorded the advertisement calls of 116 males of E. coqui along the same altitudinal transect in Puerto Rico sampled 23 years earlier [10]. A comparison between the two datasets revealed significant differences in the animals' advertisement calls; at a given altitude, they decreased in duration and increased in pitch.…”

Section: Introductionmentioning

confidence: 99%

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Climate change and frog calls: long-term correlations along a tropical altitudinal gradient

Narins

Meenderink

2014

Proc. R. Soc. B.

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Temperature affects nearly all biological processes, including acoustic signal production and reception. Here, we report on advertisement calls of the Puerto Rican coqui frog (Eleutherodactylus coqui) that were recorded along an altitudinal gradient and compared these with similar recordings along the same altitudinal gradient obtained 23 years earlier. We found that over this period, at any given elevation, calls exhibited both significant increases in pitch and shortening of their duration. All of the observed differences are consistent with a shift to higher elevations for the population, a well-known strategy for adapting to a rise in ambient temperature. Using independent temperature data over the same time period, we confirm a significant increase in temperature, the magnitude of which closely predicts the observed changes in the frogs' calls. Physiological responses to long-term temperature rises include reduction in individual body size and concomitantly, population biomass. These can have potentially dire consequences, as coqui frogs form an integral component of the food web in the Puerto Rican rainforest.

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Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: (D) Comparison With 1983-1984 Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Climate change and frog calls: long-term correlations along a tropical altitudinal gradient

Narins

Meenderink

2014

Proc. R. Soc. B.

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“…Although not universally true, the mass of the vocal cords tends to be correlated to body size so large frogs usually produce calls with a lower dominant frequency (Narins and Smith, 1986;Marquez, 1995;McClelland et al, 1996;Gerhardt and Huber, 2002); for some species, the females have been shown to prefer males with lower frequency calls (Marquez, 1995). In male A. tormotus, however, natural selection may have favored a small larynx in order to produce higher frequencies where there is less environmental noise.…”

Section: Source Of Ultrasoundmentioning

confidence: 99%

Voices of the dead: complex nonlinear vocal signals from the larynx of an ultrasonic frog

Suthers

Narins

Lin

et al. 2006

Journal of Experimental Biology

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Most vertebrate species use sound to communicate intra-and inter-specifically. The vocal repertoires of vertebrate groups range widely, with mammals and especially primates having greater repertoires and call complexity than amphibians. It is often assumed that an increase in vocal complexity requires a corresponding increase in the neuromuscular machinery involved in phonation (e.g. Gaunt, 1983;Simpson and Vicario, 1990). According to this view, animals that lack sophisticated mechanisms for motor control of the vocal system are limited to producing relatively simple vocal signals. An alternative means for increasing vocal complexity involves the intrinsic nonlinear dynamics of the oscillators in the larynx or syrinx (Fee et al., 1998). The nonlinear properties of the vocal source enable very small, gradual changes in a control parameter (such as the driving respiratory pressure or rate of airflow across the oscillator) to produce abrupt changes in the vibratory mode, resulting in such nonlinear phenomena as period doubling, biphonation, abrupt frequency jumps and deterministic chaos. The relatively recent application of nonlinear dynamics theory to animal communication has fostered a growing interest in the possible importance of nonlinear phenomena in acoustic communication (Fee et al., 1998;Wilden et al., 1998; BantaLavenex, 1999;Fee, 2002;Fitch et al., 2002).We investigated the inherent nonlinear properties of the larynx of a remarkable frog, Amolops tormotus (Ranidae). Whereas most frogs produce relatively simple calls, the vocalizations of A. tormotus are unusual in several respects. First, males of this small species produce a seemingly endless variety of warbling calls that typically contain both upward and downward frequency modulations (Feng et al., 2002). Second, this frog is unique among those studied in using ultrasound for communication. Many A. tormotus calls extend well into the ultrasonic frequency range (Narins et al., 2004). It has been shown that these frogs can detect and respond to ultrasound (Feng et al., 2006). By extending its vocal communication to Most anurans are highly vocal but their vocalizations are stereotyped and simple with limited repertoire sizes compared with other vocal vertebrates, presumably because of the limited mechanisms for fine vocal motor control. We recently reported that the call of the concaveeared torrent frog (Amolops tormotus Fei) is an exception in its seemingly endless variety, musical warbling quality, extension of call frequency into the ultrasonic range and the prominence of subharmonics, chaos and other nonlinear features. We now show that the major spectral features of its calls, responsible for this frog's vocal diversity, can be generated by forcing pressurized air through the larynx of euthanized males. Laryngeal specializations for ultrasound appear to include very thin portions of the medial vocal ligaments and reverse sexual size dimorphism of the larynx -being smaller in males than in females. The intricate morphology of the vocal cords, which ...

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Biological Constraints on Anuran Acoustic Communication: Auditory Capabilities of Naturally Behaving Animals

Narins¹

1992

The Evolutionary Biology of Hearing

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Clinal variation in anuran advertisement calls: basis for acoustic isolation?

Cited by 64 publications

References 17 publications

Climate change and frog calls: long-term correlations along a tropical altitudinal gradient

Climate change and frog calls: long-term correlations along a tropical altitudinal gradient

Voices of the dead: complex nonlinear vocal signals from the larynx of an ultrasonic frog

Biological Constraints on Anuran Acoustic Communication: Auditory Capabilities of Naturally Behaving Animals

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