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Article ; Online: Marsupial frogs

David C. Cannatella

Phyllomedusa: Journal of Herpetology, Vol 14, Iss

Gastrotheca & allied genera; with osteology by Linda Trueb

2015 Volume 2

Keywords	Biology (General) ; QH301-705.5
Language	English
Publishing date	2015-12-01T00:00:00Z
Publisher	Universidade de São Paulo
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Two new species of Eleutherodactylus from western and central Mexico (Eleutherodactylus jamesdixoni sp. nov., Eleutherodactylus humboldti sp. nov.)

Thomas J. Devitt / Karen Tseng / Marlena Taylor-Adair / Sannidhi Koganti / Alice Timugura / David C. Cannatella

PeerJ, Vol 11, p e

2023 Volume 14985

Abstract: Background The subgenus Syrrhophus (genus Eleutherodactylus) contains >40 species of small, direct-developing frogs that occur at low to moderate elevations from Texas through Mexico and into Guatemala and Belize, with two species in western Cuba. ... ...

Abstract	Background The subgenus Syrrhophus (genus Eleutherodactylus) contains >40 species of small, direct-developing frogs that occur at low to moderate elevations from Texas through Mexico and into Guatemala and Belize, with two species in western Cuba. Morphological conservatism and phenotypic convergence have made species delimitation challenging and resulted in a complicated taxonomic history. Since 2015, molecular systematic work has uncovered eleven new species from western Mexico and one from eastern Mexico, but current taxonomy still underestimates species level diversity and there is confusion surrounding the validity and boundary of several species. Methods We used phylogenetic analysis of 16S ribosomal RNA (rRNA) sequences, multivariate statistical analysis of morphological data, and bioacoustic analysis of male advertisement calls to discover two additional unnamed species of Eleutherodactylus from Central and Western Mexico. We describe those species here. Results Eleutherodactylus (Syrrhophus) humboldti sp. nov. is described from the Quaternary Valle de Bravo volcanic field of the Eje Neovolcánico in Central Mexico. This species is sister to E. maurus and is 3% divergent in 16S. Eleutherodactylus (Syrrhophus) jamesdixoni sp. nov. is described from the Sierra Madre Occidental of western Mexico. This species is sister to E. nitidus and is 3% divergent. We provide color photographs, advertisement call recordings, and molecular diagnoses of these new species and their sister species to aid future workers.
Keywords	Speciation ; Systematics ; Classification ; Biodiversity ; Biogeography ; Evolution ; Medicine ; R ; Biology (General) ; QH301-705.5
Subject code	590 ; 580
Language	English
Publishing date	2023-03-01T00:00:00Z
Publisher	PeerJ Inc.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A potential cost of evolving epibatidine resistance in poison frogs

Julia M. York / Cecilia M. Borghese / Andrew A. George / David C. Cannatella / Harold H. Zakon

BMC Biology, Vol 21, Iss 1, Pp 1-

2023 Volume 16

Abstract: Abstract Background Some dendrobatid poison frogs sequester the toxin epibatidine as a defense against predators. We previously identified an amino acid substitution (S108C) at a highly conserved site in a nicotinic acetylcholine receptor β2 subunit of ... ...

Abstract	Abstract Background Some dendrobatid poison frogs sequester the toxin epibatidine as a defense against predators. We previously identified an amino acid substitution (S108C) at a highly conserved site in a nicotinic acetylcholine receptor β2 subunit of dendrobatid frogs that decreases sensitivity to epibatidine in the brain-expressing α4β2 receptor. Introduction of S108C to the orthologous high-sensitivity human receptor similarly decreased sensitivity to epibatidine but also decreased sensitivity to acetylcholine, a potential cost if this were to occur in dendrobatids. This decrease in the acetylcholine sensitivity manifested as a biphasic acetylcholine concentration–response curve consistent with the addition of low-sensitivity receptors. Surprisingly, the addition of the β2 S108C into the α4β2 receptor of the dendrobatid Epipedobates anthonyi did not change acetylcholine sensitivity, appearing cost-free. We proposed that toxin-bearing dendrobatids may have additional amino acid substitutions protecting their receptors from alterations in acetylcholine sensitivity. To test this, in the current study, we compared the dendrobatid receptor to its homologs from two non-dendrobatid frogs. Results The introduction of S108C into the α4β2 receptors of two non-dendrobatid frogs also does not affect acetylcholine sensitivity suggesting no additional dendrobatid-specific substitutions. However, S108C decreased the magnitude of neurotransmitter-induced currents in Epipedobates and the non-dendrobatid frogs. We confirmed that decreased current resulted from fewer receptors in the plasma membrane in Epipedobates using radiolabeled antibodies against the receptors. To test whether S108C alteration of acetylcholine sensitivity in the human receptor was due to (1) adding low-sensitivity binding sites by changing stoichiometry or (2) converting existing high- to low-sensitivity binding sites with no stoichiometric alteration, we made concatenated α4β2 receptors in stoichiometry with only high-sensitivity sites. S108C ...
Keywords	Evolution ; Nicotinic acetylcholine receptor ; Poison frog ; Epibatidine ; Epipedobates anthonyi ; Xenopus tropicalis ; Biology (General) ; QH301-705.5
Subject code	572
Language	English
Publishing date	2023-06-01T00:00:00Z
Publisher	BMC
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: 2b or not 2b? 2bRAD is an effective alternative to ddRAD for phylogenomics

E. Anne Chambers / Rebecca D. Tarvin / Juan C. Santos / Santiago R. Ron / Mileidy Betancourth‐Cundar / David M. Hillis / Mikhail V. Matz / David C. Cannatella

Ecology and Evolution, Vol 13, Iss 3, Pp n/a-n/a (2023)

2023

Abstract: Abstract Restriction‐site‐associated DNA sequencing (RADseq) has become an accessible way to obtain genome‐wide data in the form of single‐nucleotide polymorphisms (SNPs) for phylogenetic inference. Nonetheless, how differences in RADseq methods ... ...

Abstract	Abstract Restriction‐site‐associated DNA sequencing (RADseq) has become an accessible way to obtain genome‐wide data in the form of single‐nucleotide polymorphisms (SNPs) for phylogenetic inference. Nonetheless, how differences in RADseq methods influence phylogenetic estimation is poorly understood because most comparisons have largely relied on conceptual predictions rather than empirical tests. We examine how differences in ddRAD and 2bRAD data influence phylogenetic estimation in two non‐model frog groups. We compare the impact of method choice on phylogenetic information, missing data, and allelic dropout, considering different sequencing depths. Given that researchers must balance input (funding, time) with output (amount and quality of data), we also provide comparisons of laboratory effort, computational time, monetary costs, and the repeatability of library preparation and sequencing. Both 2bRAD and ddRAD methods estimated well‐supported trees, even at low sequencing depths, and had comparable amounts of missing data, patterns of allelic dropout, and phylogenetic signal. Compared to ddRAD, 2bRAD produced more repeatable datasets, had simpler laboratory protocols, and had an overall faster bioinformatics assembly. However, many fewer parsimony‐informative sites per SNP were obtained from 2bRAD data when using native pipelines, highlighting a need for further investigation into the effects of each pipeline on resulting datasets. Our study underscores the importance of comparing RADseq methods, such as expected results and theoretical performance using empirical datasets, before undertaking costly experiments.
Keywords	Dendrobatidae ; missing data ; phylogenetic signal ; Ranidae ; restriction‐site‐associated DNA sequencing ; Ecology ; QH540-549.5
Subject code	310
Language	English
Publishing date	2023-03-01T00:00:00Z
Publisher	Wiley
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Amphibian community structure along elevation gradients in eastern Nepal Himalaya

Janak R. Khatiwada / Tian Zhao / Youhua Chen / Bin Wang / Feng Xie / David C. Cannatella / Jianping Jiang

BMC Ecology, Vol 19, Iss 1, Pp 1-

2019 Volume 11

Abstract: Abstract Background Species richness and composition pattern of amphibians along elevation gradients in eastern Nepal Himalaya are rarely investigated. This is a first ever study in the Himalayan elevation gradient, the world’s highest mountain range and ...

Abstract	Abstract Background Species richness and composition pattern of amphibians along elevation gradients in eastern Nepal Himalaya are rarely investigated. This is a first ever study in the Himalayan elevation gradient, the world’s highest mountain range and are highly sensitive to the effects of recent global changes. The aim of the present study was to assess amphibian community structure along elevation gradients and identify the potential drivers that regulate community structures. Amphibian assemblages were sampled within 3 months in both 2014 and 2015 (from May to July) using nocturnal time constrained and acoustic aids visual encounter surveys. In total, 79 transects between 78 and 4200 m asl were sampled within 2 years field work. A combination of polynomial regression, generalized linear models, hierarchical partitioning and canonical correspondence analysis were used to determine the effects of elevation and environmental variables on species richness, abundance, and composition of amphibian communities. Results Species richness and abundance declined linearly with increasing elevation, which did not support the Mid-Domain Model. Among all the environmental variables, elevation, surface area and humidity were the best predictors of species richness, abundance and composition of amphibians. The majority of amphibian species had narrow elevation ranges. There was no significant correlation between species range size and elevation gradients. However, body size significantly increased along elevation gradients, indicating that Bergmann’s rule is valid for amphibians in eastern Nepal Himalaya. Conclusions This study indicates that eastern Nepal Himalaya is a hotspot in amphibian diversity, and it should be served as a baseline for management and conservation activities.
Keywords	Amphibians ; Community structure ; Environmental correlation ; Elevational diversity gradient ; Ecology of the Himalayas ; Ecology ; QH540-549.5
Subject code	333
Language	English
Publishing date	2019-05-01T00:00:00Z
Publisher	BMC
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: The birth of aposematism: High phenotypic divergence and low genetic diversity in a young clade of poison frogs

Tarvin, Rebecca D / David C. Cannatella / Emily A. Powell / Juan C. Santos / Santiago R. Ron

Molecular phylogenetics and evolution. 2017 Apr., v. 109

2017

Abstract: Rapid radiation coupled with low genetic divergence often hinders species delimitation and phylogeny estimation even if putative species are phenotypically distinct. Some aposematic species, such as poison frogs (Dendrobatidae), have high levels of ... ...

Abstract	Rapid radiation coupled with low genetic divergence often hinders species delimitation and phylogeny estimation even if putative species are phenotypically distinct. Some aposematic species, such as poison frogs (Dendrobatidae), have high levels of intraspecific color polymorphism, which can lead to overestimation of species when phenotypic divergence primarily guides species delimitation. We explored this possibility in the youngest origin of aposematism (3–7 MYA) in poison frogs, Epipedobates, by comparing genetic divergence with color and acoustic divergence. We found low genetic divergence (2.6% in the 16S gene) despite substantial differences in color and acoustic signals. While chemical defense is inferred to have evolved in the ancestor of Epipedobates, aposematic coloration evolved at least twice or was lost once in Epipedobates, suggesting that it is evolutionarily labile. We inferred at least one event of introgression between two cryptically colored species with adjacent ranges (E. boulengeri and E. machalilla). We also find evidence for peripheral isolation resulting in phenotypic divergence and potential speciation of the aposematic E. tricolor from the non-aposematic E. machalilla. However, we were unable to estimate a well-supported species tree or delimit species using multispecies coalescent models. We attribute this failure to factors associated with recent speciation including mitochondrial introgression, incomplete lineage sorting, and too few informative molecular characters. We suggest that species delimitation within young aposematic lineages such as Epipedobates will require genome-level molecular studies. We caution against relying solely on DNA barcoding for species delimitation or identification and highlight the value of phenotypic divergence and natural history in delimiting species.
Keywords	acoustics ; aposematic species ; chemical defenses ; color ; DNA barcoding ; Epipedobates ; genes ; genetic variation ; introgression ; mimicry (behavior) ; mitochondria ; models ; natural history ; phenotypic variation ; phylogeny ; poisonous frogs
Language	English
Dates of publication	2017-04
Size	p. 283-295.
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	33610-5
ISSN	1095-9513 ; 1055-7903
ISSN (online)	1095-9513
ISSN	1055-7903
DOI	10.1016/j.ympev.2016.12.035
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Targeted enrichment

Shannon M Hedtke / Matthew J Morgan / David C Cannatella / David M Hillis

PLoS ONE, Vol 8, Iss 7, p e

maximizing orthologous gene comparisons across deep evolutionary time.

2013 Volume 67908

Abstract: Estimated phylogenies of evolutionarily diverse taxa will be well supported and more likely to be historically accurate when the analysis contains large amounts of data-many genes sequenced across many taxa. Inferring such phylogenies for non-model ... ...

Abstract	Estimated phylogenies of evolutionarily diverse taxa will be well supported and more likely to be historically accurate when the analysis contains large amounts of data-many genes sequenced across many taxa. Inferring such phylogenies for non-model organisms is challenging given limited resources for whole-genome sequencing. We take advantage of genomic data from a single species to test the limits of hybridization-based enrichment of hundreds of exons across frog species that diverged up to 250 million years ago. Enrichment success for a given species depends greatly on the divergence time between it and the reference species, and the resulting alignment contains a significant proportion of missing data. However, our alignment generates a well-supported phylogeny of frogs, suggesting that this technique is a practical solution towards resolving relationships across deep evolutionary time.
Keywords	Medicine ; R ; Science ; Q
Language	English
Publishing date	2013-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Insights from Integrative Systematics Reveal Cryptic Diversity in Pristimantis Frogs (Anura

H Mauricio Ortega-Andrade / Octavio R Rojas-Soto / Jorge H Valencia / Alejandro Espinosa de Los Monteros / Juan J Morrone / Santiago R Ron / David C Cannatella

PLoS ONE, Vol 10, Iss 11, p e

Craugastoridae) from the Upper Amazon Basin.

2015 Volume 0143392

Abstract: Pluralistic approaches to taxonomy facilitate a more complete appraisal of biodiversity, especially the diversification of cryptic species. Although species delimitation has traditionally been based primarily on morphological differences, the integration ...

Abstract	Pluralistic approaches to taxonomy facilitate a more complete appraisal of biodiversity, especially the diversification of cryptic species. Although species delimitation has traditionally been based primarily on morphological differences, the integration of new methods allows diverse lines of evidence to solve the problem. Robber frogs (Pristimantis) are exemplary, as many of the species show high morphological variation within populations, but few traits that are diagnostic of species. We used a combination of DNA sequences from three mitochondrial genes, morphometric data, and comparisons of ecological niche models (ENMs) to infer a phylogenetic hypothesis for the Pristimantis acuminatus complex. Molecular phylogenetic analyses revealed a close relationship between three new species-Pristimantis enigmaticus sp. nov., P. limoncochensis sp. nov. and P. omeviridis sp. nov.-originally confused with Pristimantis acuminatus. In combination with morphometric data and geographic distributions, several morphological characters such as degree of tympanum exposure, skin texture, ulnar/tarsal tubercles and sexual secondary characters (vocal slits and nuptial pads in males) were found to be useful for diagnosing species in the complex. Multivariate discriminant analyses provided a successful classification rate for 83-100% of specimens. Discriminant analysis of localities in environmental niche space showed a successful classification rate of 75-98%. Identity tests of ENMs rejected hypotheses of niche equivalency, although not strongly because the high values on niche overlap. Pristimantis acuminatus and P. enigmaticus sp. nov. are distributed along the lowlands of central-southern Ecuador and northern Peru, in contrast with P. limoncochensis sp. nov. and P. omeviridis sp. nov., which are found in northern Ecuador and southern Colombia, up to 1200 m in the upper Amazon Basin. The methods used herein provide an integrated framework for inventorying the greatly underestimated biodiversity in Amazonia.
Keywords	Medicine ; R ; Science ; Q
Subject code	590
Language	English
Publishing date	2015-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Correction

Juan C Santos / Luis A Coloma / Kyle Summers / Janalee P Caldwell / Richard Ree / David C Cannatella

PLoS Biology, Vol 8, Iss

Amazonian Amphibian Diversity Is Primarily Derived from Late Miocene Andean Lineages.

2010 Volume 9

Keywords	Biology (General) ; QH301-705.5
Language	English
Publishing date	2010-09-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Amazonian amphibian diversity is primarily derived from late Miocene Andean lineages.

Juan C Santos / Luis A Coloma / Kyle Summers / Janalee P Caldwell / Richard Ree / David C Cannatella

PLoS Biology, Vol 7, Iss 3, p e

2009 Volume 56

Abstract: The Neotropics contains half of remaining rainforests and Earth's largest reservoir of amphibian biodiversity. However, determinants of Neotropical biodiversity (i.e., vicariance, dispersals, extinctions, and radiations) earlier than the Quaternary are ... ...

Abstract	The Neotropics contains half of remaining rainforests and Earth's largest reservoir of amphibian biodiversity. However, determinants of Neotropical biodiversity (i.e., vicariance, dispersals, extinctions, and radiations) earlier than the Quaternary are largely unstudied. Using a novel method of ancestral area reconstruction and relaxed Bayesian clock analyses, we reconstructed the biogeography of the poison frog clade (Dendrobatidae). We rejected an Amazonian center-of-origin in favor of a complex connectivity model expanding over the Neotropics. We inferred 14 dispersals into and 18 out of Amazonia to adjacent regions; the Andes were the major source of dispersals into Amazonia. We found three episodes of lineage dispersal with two interleaved periods of vicariant events between South and Central America. During the late Miocene, Amazonian, and Central American-Chocoan lineages significantly increased their diversity compared to the Andean and Guianan-Venezuelan-Brazilian Shield counterparts. Significant percentage of dendrobatid diversity in Amazonia and Chocó resulted from repeated immigrations, with radiations at <10.0 million years ago (MYA), rather than in situ diversification. In contrast, the Andes, Venezuelan Highlands, and Guiana Shield have undergone extended in situ diversification at near constant rate since the Oligocene. The effects of Miocene paleogeographic events on Neotropical diversification dynamics provided the framework under which Quaternary patterns of endemism evolved.
Keywords	Biology (General) ; QH301-705.5
Subject code	550
Language	English
Publishing date	2009-03-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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