Neither convergence nor divergence in the advertisement call of sympatric congeneric Neotropical treefrogs

Toledo, Luı́s Felipe; Llusia, Diego; Vieira, Conrado Augusto; Corbo, Milena; Márquez, Rafael

doi:10.1080/09524622.2014.926831

Cited by 19 publications

(24 citation statements)

References 34 publications

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“…Our well‐supported phylogenetic hypothesis will provide an evolutionary context for the study of this poorly known phenomenon and several related character systems (e.g. morphology of the larval nostril and spiracle, vocalizations; Toledo et al., ; Araujo‐Vieira et al., ).…”

Section: Discussionmentioning

confidence: 75%

A total evidence analysis of the phylogeny of hatchet‐faced treefrogs (Anura: Hylidae: Sphaenorhynchus)

et al. 2019

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The Neotropical hylid genus Sphaenorhynchus includes 15 species of small, greenish treefrogs widespread in the Amazon and Orinoco basins, and in the Atlantic Forest of Brazil. Although some studies have addressed the phylogenetic relationships of the genus with other hylids using a few exemplar species, its internal relationships remain poorly understood. In order to test its monophyly and the relationships among its species, we performed a total evidence phylogenetic analysis of sequences of three mitochondrial and three nuclear genes, and 193 phenotypic characters from all species of Sphaenorhynchus. Our results support the monophyly of Sphaenorhynchus with molecular and phenotypic evidence, with S. pauloalvini as the earliest diverging taxon, followed by S. carneus, as the sister taxon of all remaining species of the genus. We recognize three species groups in Sphaenorhynchus (the S. lacteus, S. planicola and S. platycephalus groups), to facilitate its taxonomic study; only three species (S. carneus, S. pauloalvini and S. prasinus) remain unassigned to any group. Sequence data were not available for only two species (S. bromelicola and S. palustris) for which we scored phenotypic data; wildcard behaviour was detected only in S. bromelicola nested inside the S. platycephalus group. On the basis of the resulting phylogenetic hypothesis, we discuss the evolution of oviposition site and a number of phenotypic characters that could be associated with heterochronic events in the evolutionary history of this group.

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Section: Discussionmentioning

confidence: 75%

A total evidence analysis of the phylogeny of hatchet‐faced treefrogs (Anura: Hylidae: Sphaenorhynchus)

et al. 2019

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“…Empirical evidence for character displacement in amphibians was found for an array of species (Blair 1955(Blair , 1974Littlejohn 1965Littlejohn , 1999Loftus-Hills & Littlejohn 1992;Gerhardt 1994a;Márquez & Bosch 1997;Pfennig 2000;Höbel & Gerhardt 2003;Pfennig & Pfennig 2005Hoskin et al 2005;Guerra & Ron 2008;Lemmon & Lemmon 2010;Richards-Zawacki & Cummings 2010;Rice & Pfennig 2010;Micancin & Wiley 2014;Jansen et al 2016a), but this process may not apply to all genera (Toledo et al 2015c). RCD in frogs regularly concerns acoustical signal traits related to mate finding and choice (e.g., temporal call parameters : Fouquette 1975 (Gerhardt & Huber 2002), or it can be an adaptation to diverging female preferences (Boul et al 2007).…”

Section: Character Displacementmentioning

confidence: 99%

“…As stated above and also noted for other organisms (e.g., Tishechkin 2014), identity of acoustic signals does not provide conclusive evidence for taxonomic identity. However, under sympatric conditions (except for narrow contact and hybrid zones) it is highly unlikely that two distinct species will be characterized by identical vocalizations because selective pressures would promote bioacoustical divergence (but see Toledo et al 2015c for discussion on sympatric and allopatric selective pressures). Hence, under conditions of sympatry, bioacoustical identity can serve as an indication, although not conclusive evidence, for taxonomic identity.…”

Section: Species Identification and Delimitation By Advertisement Callsmentioning

confidence: 99%

“…If in sympatric situations two genetically or morphologically divergent groups consistently differ also in a bioacoustical variable, even if slightly, this can be a strong indicator for taxonomic distinctness. Multivariate statistics of call parameters might be useful to visualize these slight but consistent differences detected (see Toledo et al 2015c).…”

Section: Usage Of Statistics In Call Comparisonsmentioning

confidence: 99%

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

Köhler

Jansen

Rodríguez³

et al. 2017

Zootaxa

Self Cite

457

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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“…We performed cluster analyses based on acoustic similarities using the Bray-Curtis index, through the UPGMA method and bootstrap with 1000 randomizations (see Toledo et al, 2015b).…”

Section: Statistical Analysesmentioning

confidence: 99%

Peer Review #2 of "Advertisement call and genetic structure conservatism: good news for an endangered Neotropical frog (v0.3)"

2016

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Background. Many amphibian species are negatively affected by anthropogenic habitat change. Populations distributed over modified landscapes may be subject to local extinction or may be relegated to remaining, likely isolated and possibly degraded, patches of available habitat. Isolation without gene flow can lead to variability in phenotypic traits due to differences in local selective pressures, such as environmental structure, microclimate or site-specific species assemblages. Methods. Here we tested this microevolution hypothesis by evaluating the acoustic parameters of 349 advertisement calls from 15 males representing six populations of the endangered species Proceratophrys moratoi. In addition, we analyzed the genetic distance between populations and the genetic diversity by haplotype network. We carried out a cluster analysis by Bray-Curtis index of similarity using acoustic data by UPGMA method. We correlated acoustic dissimilarities (calculated by Euclidean distance) with geographic and genetic distances among populations. Results. Spectral traits of the advertisement call of P. moratoi presented lower coefficients of variation than did temporal traits both within and among males. Cluster analyses placed individuals without population and geographical distance congruence, but recovered the species topology in relation to sister species. The genetic distance was low among populations: it did not exceed 0.4% for the most distant populations, and was not correlated with acoustic distance. Discussion. Both acoustic features and genetic sequences are highly conserved, suggesting that populations may be connected by recent migrations or that they are subject to stabilizing selective forces. Although future studies are needed, these findings contribute to a growing body of literature suggesting that this species would be a good candidate for a reintroduction program without negative effects on communication or even genetic heritage.

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Neither convergence nor divergence in the advertisement call of sympatric congeneric Neotropical treefrogs

Cited by 19 publications

References 34 publications

A total evidence analysis of the phylogeny of hatchet‐faced treefrogs (Anura: Hylidae: Sphaenorhynchus)

A total evidence analysis of the phylogeny of hatchet‐faced treefrogs (Anura: Hylidae: Sphaenorhynchus)

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

Peer Review #2 of "Advertisement call and genetic structure conservatism: good news for an endangered Neotropical frog (v0.3)"

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