Jason L. Brown

Jason L. Brown
Southern Illinois University Carbondale | SIU · Department of Zoology

Ph. D.

About

124
Publications
43,291
Reads
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3,100
Citations
Additional affiliations
January 2016 - present
Southern Illinois University Carbondale
Position
  • Professor (Assistant)
June 2013 - December 2015
City College of New York
Position
  • PostDoc Position
June 2009 - October 2013
Duke University
Position
  • PostDoc Position

Publications

Publications (124)
Chapter
Although first biogeographic analyses of Madagascar's amphibian fauna were provided by Blommers-Schlösser and Blanc (1993), these could only provide first hints at possible patterns due to incomplete taxonomic and distributional knowledge at the time. Since this pioneering work, the combination of increased field exploration, integrative taxonomy,...
Article
Full-text available
The use of genome-scale data in phylogenetics has enabled recent strides in determining the relationships between taxa that are taxonomically problematic because of extensive morphological variation. Here, we employ a phylogenomic approach to infer evolutionary relationships within Ranitomeya (Anura: Dendrobatidae), an Amazonian lineage of poison f...
Article
Full-text available
Aim There is little consensus on which environmental variables are best at predicting multiple dimensions of diversity. We ask whether there are common environmental correlates of diversity, despite ecological differences, across nine clades of plants and animals distributed along a single rainforest domain. For that, we compare the environmental c...
Article
Ancestral range estimation and projection of niche models into the past have both become common in evolutionary studies where the ancient distributions of organisms are in question. However, these methods are hampered by complementary hurdles: discrete characterization of areas in ancestral range estimation can be overly coarse, especially at shall...
Article
Full-text available
Aim We combine phylogenetic and point locality data from selected lineages of the Atlantic Forest flora and fauna to compare spatial patterns of biodiversity sustained by the current configuration of forest remnants to a scenario of complete forest preservation. We then ask the question "how much biodiversity is likely lost, already"? Specifically,...
Article
Here we evaluate Oscillayers, a new method that aims to estimate palaeoclimates for the past 5.4 Myr, and discuss the associated theoretical and methodological issues. We show that the theoretical foundation of Oscillayers is inherently limited, because the method cannot incorporate spatio‐temporal variation and different forcing mechanisms into cl...
Article
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We describe two new species of poison frog from central and southern Peru that have been referred to as Ameerega picta, A. hahneli, or A. altamazonica throughout the past thirty years. Our phylogenies generated with genomic data provide strong support that the two new species are successive sisters to two described taxa, A. rubriventris and A. alta...
Article
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Ecological studies of species pairs showed that biotic interactions promote phenotypic change and eco‐evolutionary feedbacks. However, it is unclear how phenotypes respond to synergistic interactions with multiple taxa. We investigate whether interactions with multiple prey species explain spatially structured variation in the skin toxins of the ne...
Article
The Amazonian poison frog genus Ameerega is one of the largest yet most understudied of the brightly colored genera in the anuran family Dendrobatidae, with 30 described species ranging throughout tropical South America. Phylogenetic analyses of Ameerega are highly discordant, lacking consistency due to variation in data types and methods, and ofte...
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Climatic conditions changing over time and space shape the evolution of organisms at multiple levels, including temperate lizards in the family Lacertidae. Here we reconstruct a dated phylogenetic tree of 262 lacertid species based on a supermatrix relying on novel phylogenomic datasets and fossil calibrations. Diversification of lacertids was acco...
Preprint
Full-text available
Ecological studies of species pairs demonstrated that biotic interactions promote phenotypic change and eco-evolutionary feedbacks. However, we have a limited understanding of how phenotypes respond to interactions with multiple taxa. We investigate how interactions with a network of prey species contribute to spatially structured variation in the...
Article
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The black-spined toad, Duttaphrynus melanostictus, is widespread in South and South-East (SE) Asia, although recent molecular analyses have revealed that it represents a species complex (here called the D. melanostictus complex). Invasive populations of this toad have been detected in Madagascar since, at least, 2014. We here trace the origin of th...
Article
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Anuran amphibians undergo major morphological transitions during development, but the contribution of their markedly different life-history phases to macroevolution has rarely been analysed. Here we generate testable predictions for coupling versus uncoupling of phenotypic evolution of tadpole and adult life-history phases, and for the underlying e...
Data
Nexus file of morphological characters of tadpoles of mantellid frogs. Characters as in Supplementary Table 5.
Data
Supplementary Figures, Supplementary Tables, Supplementary Methods and Supplementary Refernces
Data
Perl script used to extract list of Gene Ontologies associated with morphology from Mantidactylus betsileanus annotated transcripts, based on list defined on morphology-associated GO terms list in Xenopus laevis.
Data
Nexus file of morphological characters of adult mantellid frogs. Characters as in Supplementary Table 4.
Article
Full-text available
We apply a comparative framework to test for concerted demographic changes in response to climate shifts in the neotropical lowland forests, learning from the past to inform projections of the future. Using reduced genomic (SNP) data from three lizard species codistributed in Amazonia and the Atlantic Forest (Anolis punctatus, Anolis ortonii, and P...
Article
Aim: Using a comprehensive floristic database (2616 species, 36,004 occurrence records from 128 unique localities), we model species turnover along the central region of the Atlantic Forest hotspot to (1) test whether local rivers, particularly the Rio Doce, are associated with marked biogeographical breaks, and (2) investigate how regional composi...
Article
Full-text available
Premise of the study: Climate change is a widely accepted threat to biodiversity. Species distribution models (SDMs) are used to forecast whether and how species distributions may track these changes. Yet, SDMs generally fail to account for genetic and demographic processes, limiting population-level inferences. We still do not understand how pred...
Article
Full-text available
Madagascar has become a model region for testing hypotheses of species diversification and biogeography, and many studies have focused on its diverse and highly endemic herpetofauna. Here we combine species distribution models of a near-complete set of species of reptiles and amphibians known from the island with body size data and a tabulation of...
Data
Summary of survey data used in the meta-analysis and references for the original data. (DOC)
Data
Metadata and geographical location of herpetofaunal communities used for analysis. Data extracted from surveys listed in S1 Table. (DOC)
Data
List of species, body size (maximum male snout-vent length), number of distribution records, size of original and trimmed SDM, and range filling of amphibian and reptile species used for analysis. (DOC)
Data
Figure copyright information. (DOC)
Data
Species numbers of major amphibian and reptile groups used for comparison of herpetofaunal communities. Data extracted from surveys listed in S1 Table. (DOC)
Article
Full-text available
Peru supports approximately 588 amphibian species, of which 492 have been assessed on the IUCN Red List of Threatened Species. Of these, 111 are classified as Threatened, with 69 species classified as Critically Endangered or Endangered. In addition, 140 amphibian species remain Data Deficient. We reassessed the conservation status of 38 amphibian...
Article
Full-text available
The rainforest biome of eastern Madagascar is renowned for its extraordinary biodiversity and restricted distribution ranges of many species, whereas the arid western region of the island is relatively species poor. We provide insight into the biogeography of western Madagascar by analyzing a multilocus phylogeographic dataset assembled for an amph...
Article
Full-text available
Geospatial modeling is one of the most powerful tools available to conservation biologists for estimating current species ranges of Earth's biodiversity. Now, with the advantage of predictive climate models, these methods can be deployed for understanding future impacts on threatened biota. Here, we employ predictive modeling under a conservative e...
Article
Full-text available
Although numerous studies have attempted to find single unifying mechanisms for generating Madagascar's unique flora and fauna, little consensus has been reached regarding the relative importance of climatic, geologic, and ecological processes as catalysts of diversification of the region's unique biota. Rather, recent work has shown that both biol...
Article
Full-text available
Pattern and process are inextricably linked in biogeographic analyses, though we can observe pattern, we must infer process. Inferences of process are often based on ad hoc comparisons using a single spatial predictor. Here, we present an alternative approach that uses mixed-spatial models to measure the predictive potential of combinations of hypo...
Article
Full-text available
BACKGROUND: An understanding of the conservation status of Madagascar's endemic reptile species is needed to underpin conservation planning and priority setting in this global biodiversity hotspot, and to complement existing information on the island's mammals, birds and amphibians. We report here on the first systematic assessment of the extinctio...
Article
1.Species distribution models (SDMs) are broadly used in ecological and evolutionary studies. Almost all SDM methods require extensive data preparation in a geographic information system (GIS) prior to model building. Often this step is cumbersome and if not properly done, can lead to poorly parameterized models or in some cases, if too difficult,...
Article
Full-text available
We describe a new species of poison frog from Amazonian Peru. Dendrobates uakarii, sp. nov. is distinguished by the presence of paired parallel dorsolateral lines: one yellow oblique lateral and one red dorsolateral (on each flank), with one vertebral line, similar in color to the dorsolateral lines. Phylogenetic analysis show that D. uakarii, sp....
Article
Full-text available
This Special Issue demonstrates the breadth of evolutionary ecology research occurring on Neotropical poison frogs (Dendrobatidae). It also draws attention to the incredible diversity of the poison frogs themselves (phenotypic, behavioral and taxonomic diversity) and this group's potential for research programs focusing on speciation, the evolution...
Article
Full-text available
The evolutionary mechanisms causing intraspecific diversity in aposematic color and pattern remain enigmatic. The strawberry poison frog (Oophaga pumilio) has diversified into a broad array of colors that span the visible spectrum. The most divergent phenotypes of O. pumilio are restricted to separate islands in the Bocas del Toro archipelago in we...
Article
Full-text available
The evolution of Müllerian mimicry is, paradoxically, associated with high levels of diversity in color and pattern. In a mimetic radiation, different populations of a species evolve to resemble different models, which can lead to speciation. Yet there are circumstances under which initial selection for divergence under mimicry may be reversed. Her...
Data
Standardized discriminant coefficients for each dimension (see text). (DOCX)
Data
Tests for violations of Hardy-Weinberg Equilibrium for each locus across all populations. (DOCX)
Data
Tests for linkage disequilibrium between microsatellite loci. (DOCX)
Data
Levels of gene flow estimated with BayesAss, including 95% confidence intervals. The site “Pongo de Cainarachi” as shown on Fig. S1 has been shortened to “Pongo”. (DOCX)
Data
Localities for collection of samples in this study, in San Martin and Loreto Province, Peru. (DOCX)
Data
Map of all sampling localities mentioned in the text. Black scale bar equals 20 km. Two localities (Balsapuerto and Chipesa) were used only in the relative abundance analysis. (TIFF)
Data
Raw counts for relative abundance analysis. Numbers refer to the number of individuals found for that species in that site. A zero is given for cases where that species is assumed to occur at that site but was never found. Blank fields indicate the species is likely absent from that site. The superscript “m” indicates the putative model species at...
Data
Significance tests of the discriminant dimensions (see text). (DOCX)
Article
Mantella viridis is a threatened poison frog species endemic to the ecologically very heterogeneous northern region of Madagascar. The existence of several colour morphs within M. viridis and its very low genetic differentiation to the allopatrically distributed Mantella ebenaui raise questions about the processes driving the differentiation betwee...
Article
Full-text available
In this paper, we analyze variation in spectral reflectance and color pattern among populations to demonstrate dramatic divergence between four distinct morphs of the mimic poison frog Ranitomeya imitator. We also analyze genetic divergence in d-loop mtDNA sequences between populations. We then use coalescent-based simulations to demonstrate that t...
Article
A central goal of phylogeography is to identify and characterize the processes underlying divergence. One of the biggest impediments currently faced is how to capture the spatiotemporal dynamic under which a species evolved. Here, we described an approach that couples species distribution models (SDMs), demographic and genetic models in a spatiotem...
Article
Full-text available
The Neotropical poison frog genus Ranitomeya is revised, resulting in one new genus, one new species, five synonymies and one species classified as nomen dubium. We present an expanded molecular phylogeny that contains 235 terminals, 104 of which are new to this study. Notable additions to this phylogeny include seven of the 12 species in the minut...
Article
The Neotropical poison frog genus Ranitomeya is revised, resulting in one new genus, one new species, five synonymies and one species classified as nomen dubium. We present an expanded molecular phylogeny that contains 235 terminals, 104 of which are new to this study. Notable additions to this phylogeny include seven of the 12 species in the minut...
Article
The field of phylogeography continues to grow in terms of power and accessibility. Initially uniting population genetics and phylogenetics, it now spans disciplines as diverse as geology, statistics, climatology, ecology, physiology, and bioinformatics to name a few. One major and recent integration driving the field forward is between "statistical...
Article
Full-text available
Predicted forest losses and a recent government ban on logging build support for trade protection of Malagasy rosewood.
Article
Aim The strawberry poison frog, Oophaga pumilio, has undergone a remarkable radiation of colour morphs in the Bocas del Toro archipelago in Panama. This species shows extreme variation in colour and pattern between populations that have been geographically isolated for < 10,000 years. While previous research has suggested the involvement of diverge...
Article
Full-text available
We describe two new species of Ranitomeya (family Dendrobatidae), R. yavaricola sp. nov. and R. cyanovittata sp. nov., from Peru. Ranitomeya yavaricola sp. nov. is morphologically similar to certain other species of Ranitomeya (in particular R. flavovittata), but the new species can be easily distinguished from all other species of Ranitomeya based...
Article
We describe two new species of Ranitomeya (family Dendrobatidae), R. yavaricola sp. nov. and R. cyanovittata sp. nov., from Peru. Ranitomeya yavaricola sp. nov. is morphologically similar to certain other species of Ranitomeya (in particular R. flavovittata), but the new species can be easily distinguished from all other species of Ranitomeya based...
Article
Full-text available
Linking specific ecological factors to the evolution of parental care pattern and mating system is a difficult task of key importance. We provide evidence from comparative analyses that an ecological factor (breeding pool size) is associated with the evolution of parental care across all frogs. We further show that the most intensive form of parent...
Article
Full-text available
We describe a new species of Ranitomeya (family Dendrobatidae) which we discovered on a recent expedition to the Río Apaporis region in southeastern Colombia. This species had previously been referred to as Dendrobates quinquevittatus sensu Silverstone, based on a single specimen collected in the 1950s from the mouth of Río Apaporis. We found addit...
Article
We describe a new species of Ranitomeya (family Dendrobatidae) which we discovered on a recent expedition to the Río Apaporis region in southeastern Colombia. This species had previously been referred to as Dendrobates quinquevittatus sensu Silverstone, based on a single specimen collected in the 1950s from the mouth of Río Apaporis. We found addit...