Bioacoustic analysis of advertisement calls of two ground-frogs of the genus Platymantis in Mount Magdiwata, San Francisco, Agusan del Sur, Philippines (original) (raw)
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Notes on Advertisement Calls Playback by Three Species of Sarawakian Frogs
Borneo Journal of Resource Science and Technology
Male and female frogs respond differently towards advertisement calls. The fittest call will be chosen by the conspecific female to produce progenies, means that call from male to female is to ensure the survival of the species. The objective is to observe the response of both male and female frogs by playing the advertisement call to another male or female of the same species at their breeding site. The advertisement calls were recorded manually and were replayed using a speaker with built-in amplifier. The frog’s responses were then recorded in video form. Ambient temperatures were taken using data logger. The calls were analyzed to describe call characteristics. From the acoustic playback, both male and female Pulchrana glandulosa responded towards the calls. The male produces a crying-like sound while approaching playback source meanwhile the female produces a small “wik” sound. Male Pulchrana baramica responded by straining their calls and approaches the playback source. For ma...
Frog call intensities and sound propagation in the South American temperate forest region
Behavioral Ecology and Sociobiology, 1998
Sound pressure levels and the spectral structure of the advertisement calls of ®ve species of frogs from the South American temperate austral forest were analyzed. Males of Eupsophus emiliopugini, Batrachyla antartandica and B. leptopus call from the ground in bogs, while males of Hylorina sylvatica and Pleurodema thaul call from the water surface in marshes. Calling males of the species from bogs and marshes spaced at average distances that were shorter and longer than 2 m, respectively. The properties of these habitats for sound propagation were evaluated by broadcasting pure tones, broadband noise and tape-recorded advertisement calls of the three species from bogs and of H. sylvatica. Excess attenuation and spectral degradation were higher for calls broadcast in bogs than in the marsh. The calls of B. antartandica and B. leptopus, with dominant frequencies of about 2 kHz, were more aected than those of E. emiliopugini and H. sylvatica, with dominant frequencies below 1.5 kHz. These results show the lack of an optimal relationship between properties of habitats for sound transmission and the spectral structure of these anuran calls. Body size imposes an important constraint on call spectra and propagation, which frogs counteract by distribution patterns and auditory capabilities.
2005
The variability of the advertisement calls of males from two Chilean populations of the leptodactylid frogs, Eupsophus calcaratus and E. roseus was studied and their calling behaviour further defined. Characteristic audio spectrograms and oscillograms for each species are presented. The spectral and temporal features of the calls were analysed, and intra-population and inter-specific differences in sound parameters were tested using correlation and discriminant function analysis. The calls of both species were tonal, had specific frequency modulation patterns (FM), and showed substantial inter-individual variation in several of their components. At least four discernible types of FM patterns were found in both species. Audio-spectrogram correlation and discriminant analysis showed that the quantitative characteristics of the calls of the species were clearly distinct; the most discriminating parameters were frequency, inter-call interval, and fundamental frequency.
Vocal responses of austral forest frogs to amplitude and degradation patterns of advertisement calls
Behavioural processes, 2017
Degradation phenomena affecting animal acoustic signals may provide cues to assess the distance of emitters. Recognition of degraded signals has been extensively demonstrated in birds, and recently studies have also reported detection of degraded patterns in anurans that call at or above ground level. In the current study we explore the vocal responses of the syntopic burrowing male frogs Eupsophus emiliopugini and E. calcaratus from the South American temperate forest to synthetic conspecific calls differing in amplitude and emulating degraded and non-degraded signal patterns. The results show a strong dependence of vocal responses on signal amplitude, and a general lack of differential responses to signals with different pulse amplitude modulation depths in E. emiliopugini and no effect of relative amplitude of harmonics in E. calcaratus. Such limited discrimination of signal degradation patterns from non-degraded signals is likely related to the burrowing habits of these species....
The transmission of advertisement calls in Central American frogs
Behavioral Ecology, 2000
Acoustic communication signals change over distance due to loss of amplitude and fidelity, and it is assumed that signal degradation influences the receiver's ability to detect and decode signals. The degree of degradation depends on the signal's structure and the environment through which it transmits. We broadcast the advertisement calls of 22 species of Central American frogs at two heights within forested and open environments in Panama. We recorded these calls at five distances from the source and estimated signal degradation with a cross-correlation analysis, a measure that combines the effects of decrement in signal amplitude and fidelity. Calls degraded less when broadcast higher above the ground compared to on the ground, and less in open habitat compared to forested habitat; there was an additional interaction between height and environment. Furthermore, calls with low dominant frequencies experienced less degradation than calls with high dominant frequencies. There was no evidence, however, that the calls of these frogs have evolved to maximize habitat-specific transmission.
Bioacoustic Studies on Three Frog Species from the Western Ghats, South India
Current Herpetology, 2009
The advertisement calls of three Indian frogs, Ramanella triangularis (Microhylidae), Indirana gundia (Ranixalidae), and Fejervarya rufescens (Dicroglossidae) are described. The call of R. triangularis, consisting of 30 pulses with low dominant frequency bands around 0.6 and 1.1 kHz, had a mean duration of 0.38 s, and was emitted at about 3 s call intervals. The call of I. gundia was much shorter, with a duration of only 0.1 s and was emitted at longer, rather irregular intervals. The dominant band was recognized at 1.4 kHz, and pulsation was indistinct. The call of F. rufescens, consisting of 24.9 pulses, had a mean duration of 0.46 s, and was emitted at 3.68 s call intervals. There were numerous frequency bands in its call, with dominant bands around 3 kHz. These results are compared with those of previous studies on the same and related species. Ecological observations on calling sites and behavior are also presented.
Descriptions of the advertisement calls of some Bornean frogs
2010
We describe the temporal and spectral properties of advertisement calls of seven species of Bornean anuran amphibians, from the following families—Bufonidae: Ansonia leptopus (Günther, 1872) and Ingerophrynus quadriporcatus (Boulenger, 1887); Microhylidae: Microhyla borneensis Parker, 1928; Ranidae: Hylarana signata (Günther, 1872); Megophryidae: Leptobrachella mjobergi Smith, 1925, Leptolalax cf. gracilis (Günther, 1872), and Leptolalax maurus Inger, Lakim, Biun et Yambun, 1997. All, except L.
Understanding the variability of acoustic signals is a first important step for the comprehension of the evolutionary processes that led to current diversity. Herein, we evaluate the variability of the advertisement call of the phyllomedusid species from the genera Phyllomedusa and Pithecopus at different levels: intra-individual, intra-population, inter-population, intra-species, and inter-specific. An analysis of coefficients of variation showed a continuum of variability between the acoustic parameters analyzed, from static to highly dynamic. Most of the variation was attributed to the inter-specific level while call parameters at the intra-individual level varied the least. However, each parameter behaved differently with call interval being the most variable across all levels. Most temporal acoustic parameters were affected by environmental temperature while pulse rate and dominant frequency were strongly influenced by body size. Only pulse rate was correlated to the geographic...
Journal of Comparative Physiology A, 2004
Territorial males of the pan-Amazonian Dartpoison frog, Epipedobates femoralis, are known to present stereotypic phonotactic responses to the playback of conspecific and synthetic calls. Fixed site attachment and a long calling period within an environment of little temperature change render this terrestrial and diurnal pan-Amazonian frog a rewarding species for field bioacoustics. In experiments at the field station Arataı¨, French Guiana, we tested whether the prominent frequency modulation of the advertisementcall notes is critical for eliciting phonotactic responses. Substitution of the natural upward sweep by either a pure tone within the species frequency range or a reverse sweep did not alter the males' phonotactic behavior. Playbacks with artificial advertisement calls embedded in high levels of either low-pass or high-pass masking noise designed to saturate nerve fibers from either the amphibian papilla or basilar papilla showed that male phonotactic behavior in this species is subserved by activation of the basilar papilla of the inner ear.
Bioacoustic analysis of frog calls from northeast India
Journal of Biosciences, 1993
Mating calls of three frog species abundant in northeast India Rana tigerina, Rana cyanophlyctis and Rana limnocharis were recorded in the fields of Assam and Meghalaya during their breeding season (July-August, 1991). The calls were analysed for their temporal and spectral characters. They were species specific, with distinct call duration and call period, number of pulses per call and interpulse interval, and dominant frequency and frequency domain. A comparison of the mating calls of Rana cyanophlyctis with those of the sibling Rana ehrenbergi from Yemen showed differences in their temporal and spectral characters, supporting the suggestion that these two species are distinct species, rather than subspecies of the same species. Differences in the temporal and spectral pattern were found in the mating calls of morphologically alike specimens of Rana limnocharis, indicating that the present morphotype Rana limnocharis in northeast India is composed of several species.