Ancestral genetic variation in phenotypic plasticity underlies rapid evolutionary changes in resurrected populations of waterfleasMatthew Walsh, J. Alex Landy, Alixander Oschmann & Stephan Munch
The role that phenotypic plasticity plays in adaptive evolution has been debated for decades. This is because the strength of natural selection is dependent upon the direction and magnitude of phenotypic responses to environmental signals. Therefore, the connection between plasticity and adaptation will depend on the patterns of plasticity harbored by ancestral populations prior to a change in the environment. Yet, few studies have directly assessed ancestral variation in plasticity and tracked phenotypic changes over...
1. Mass effect, allowing species to persist in unfavourable habitats, and dispersal limitation, preventing species from reaching favourable habitats, are the two major dispersal processes. While dispersal limitation can be detected by experimental or modeling techniques, mass effect is more challenging to evaluate, which hampers our ability to disentangle the influence of the environment vs. dispersal on species distribution. This is undesirable for biomonitoring programs built on known species-environment relationships. 2. We developed an approach...
QTL × environment interactions underlie adaptive divergence in switchgrass across a large latitudinal gradientDavid Lowry, John Lovell, Li Zhang, Jason Bonnette, Philip Fay, Robert Mitchell, John Lloyd-Reilley, Arvid Boe, Yanqi Wu, Francis Rouquette, Richard Wynia, Xiaoyu Weng, Kathrine Behrman, Adam Healey, Kerrie Barry, Anna Lipzen, Diane Bauer, Aditi Sharma, Jerry Jenkins, Jeremy Schmutz, Felix B. Fritschi & Thomas E. Juenger
Local adaptation is the process by which natural selection drives adaptive phenotypic divergence across environmental gradients. Theory suggests that local adaptation results from genetic trade-offs at individual genetic loci, where adaptation to one set of environmental conditions results in a cost to fitness in alternative environments. However, the degree to which there are costs associated with local adaptation is poorly understood because most of these experiments rely on two-site reciprocal transplant experiments. Here, we quantify...
Finding complexity in complexes: assessing the causes of mitonuclear discordance in a problematic species complex of Mesoamerican toadsThomas Firneno, Justin O'Neill, Daniel Portik, Alyson Emery, Josiah Townsend & Matthew Fujita
Mitonuclear discordance is a frequently encountered pattern in phylogeographic studies and occurs when mitochondrial and nuclear DNA display conflicting signals. Discordance among these genetic markers can be caused by several factors including confounded taxonomies, gene flow, and incomplete lineage sorting. In this study, we present a strong case of mitonuclear discordance in a species complex of toads (Bufonidae: Incilius coccifer complex) found in the Chortís Block of Central America. To determine the cause of mitonuclear...
Brain size, brain architecture, and eye size vary extensively in vertebrates. However, the extent to which the evolution of these components is intricately connected remains unclear. Trinidadian killifish, Anablepsoides hartii, are found in sites that differ in the presence and absence of large predatory fish. Decreased rates of predation are associated with evolutionary shifts in brain size; males from sites without predators have evolved a relatively larger brain and eye size than males from sites...
Comparative phylogeographic studies often support shared divergence times for co-distributed species with similar life histories and habitat specializations. During the late Holocene, West Africa experienced aridification and the turnover of rain forest habitats into savannas. These fragmented rain forests harbor impressive numbers of endemic and threatened species. In this setting, populations of co-distributed rain forest species are expected to have diverged simultaneously, whereas divergence events for species adapted to savanna and forest-edge habitats should be...
Data from: Transcriptome sequencing reveals signatures of positive selection in the spot-tailed earless lizardJose Maldonado, , Corey Roelke, Nathan Rains, Juliet Mwgiri & Matthew Fujita
The continual loss of threatened biodiversity is occurring at an accelerated pace. High-throughput sequencing technologies are now providing opportunities to address this issue by aiding in the generation of molecular data for many understudied species of high conservation interest. Our overall goal of this study was to begin building the genomic resources to continue investigations and conservation of the Spot-Tailed Earless lizard. Here we leverage the power of high-throughput sequencing to generate the liver transcriptome...
Delimitation despite discordance: Evaluating the species limits of a confounding species complex in the face of mitonuclear discordanceThomas Firneno, Justin O'Neill, Michael Itgen, Timothy Kihneman, Josiah Townsend & Matthew Fujita
The delimitation of species is an essential pursuit of biology, and proper taxonomies are crucial for the assessment and conservation management of organismal diversity. However, delimiting species can be hindered by a number of factors including highly conserved morphologies (e.g. cryptic species), differences in criteria of species concepts, and discordance between gene topologies (e.g. mitonuclear discordance). Here we use a taxonomically confounded species complex of toads in Central America that exhibits extensive mitonuclear discordance to...
Eye size and investment in frogs and toads correlate with adult habitat, activity pattern and breeding ecologyKate N. Thomas, David J. Gower, Rayna C. Bell, Matthew K. Fujita, Ryan K. Schott & Jeffrey W. Streicher
Frogs and toads (Amphibia: Anura) display diverse ecologies and behaviours, which are often correlated with visual capacity in other vertebrates. Additionally, anurans exhibit a broad range of relative eye sizes, which have not previously been linked to ecological factors in this group. We measured relative investment in eye size and corneal size for 220 species of anurans representing all 55 currently recognized families and tested whether they were correlated with six natural history traits hypothesized...
The University of Texas at Arlington9
Indiana University of Pennsylvania2
University of Washington1
The University of Texas at Austin1
South Dakota State University1
Texas A&M University1
Oklahoma State University1
University System of Maryland1
Museum of Vertebrate Zoology1