A5011191505- Genetic diversity and population structure
- Amphibian and Reptile Biology
- Plant and animal studies
- Animal Behavior and Reproduction
- Identification and Quantification in Food
- Avian ecology and behavior
- Species Distribution and Climate Change
- Environmental DNA in Biodiversity Studies
- Wildlife Ecology and Conservation
- Genomics and Phylogenetic Studies
- Marine animal studies overview
- Animal Vocal Communication and Behavior
- Fish biology, ecology, and behavior
- Fish Ecology and Management Studies
- Evolution and Paleontology Studies
- Ecology and Vegetation Dynamics Studies
- Molecular Biology Techniques and Applications
- Bat Biology and Ecology Studies
- Genetic and phenotypic traits in livestock
- Animal and Plant Science Education
- Microbial Community Ecology and Physiology
- Physiological and biochemical adaptations
- Indigenous Studies and Ecology
- Turtle Biology and Conservation
- Aquatic Ecosystems and Phytoplankton Dynamics
Queen's University
2015-2024
Tongji University
2021
Bernardino Rivadavia Natural Sciences Museum
2010
University of Guelph
1986-2000
University of Toronto
2000
Conservation International
2000
National Institute of Amazonian Research
2000
Museum of Vertebrate Zoology
2000
Western University
1989-1993
National University of Tucumán
1990
There is growing interest in quantifying genetic population structure across the geographical ranges of species to understand why might exhibit stable range limits and assess conservation value peripheral populations. However, many assertions regarding populations rest on long-standing but poorly tested supposition that low diversity greater differentiation as a consequence smaller effective size isolation relative geographically central We reviewed 134 studies representing 115 for declines...
Rivers have been suggested to played an important role in shaping present-day patterns of ecological and genetic variation among Amazonian species communities. Recent molecular studies provided mixed support for the hypothesis that large lowland rivers functioned as significant impediments gene flow populations neotropical species. To date, no study has systematically evaluated impact riverine barriers might on structuring whole Our analyses phylogeography frogs small mammals indicate a...
Journal Article Measurement Error and Morphometric Studies: Statistical Power Observer Experience Get access Stephen M. Yezerinac, Yezerinac Ecology Evolution Group, Department of Zoology, University Western Ontario,London, Ontario N6A 5B7, Canada Search for other works by this author on: Oxford Academic PubMed Google Scholar C. Lougheed, Lougheed Paul Handford Systematic Biology, Volume 41, Issue 4, December 1992, Pages 471–482, https://doi.org/10.1093/sysbio/41.4.471 Published: 01 1992...
Climate change profoundly influences species distributions. These effects are evident in poleward latitudinal range shifts for many taxa, and upward altitudinal alpine species, that resulted from increased annual global temperatures since the Last Glacial Maximum (LGM, ca. 22,000 BP). For latter, ultimate consequence of may be extinction as highest ecosystems can migrate no further, a phenomenon often characterized "nowhere to go". To predict responses climate plants on Qinghai-Tibetan...
Mitochondrial DNA cytochrome b sequence data from a dart–poison frog, Epipedobates femoralis, were used to test two hypotheses of Amazonian diversification: the riverine barrier and ridge hypotheses. Samples derived sites located on both banks Rio Juruá sides Iquitos Arch in western Amazonia. The phylogeographic structure was inconsistent with predictions hypothesis. Haplotypes opposite river did not form monophyletic clades any our phylogenetic analyses, nor topology within major consistent...
Abstract Competitive partitioning of ‘community’ signal space has long been suggested to underlie diversification mating signals. Selection or competitive exclusion is expected reduce overlap signals, minimizing destructive interference reducing mismating. We used null models backed by simulation type I and II error rates test for evidence structuring within 11 frog advertisement call assemblages. Within three assemblages, we found significant over‐dispersion regularity‐of‐spacing in...
We present data on variation in frequency and duration characters of the advertising song Zonotrichia capensis, Rufous-collared sparrow, information qualitative structure introductory "theme." These are analyzed with respect to their relationships altitude, habitat type, body size, syrinx size dialect shown by terminal trill. Principal components analysis shows that major axis (PC1) variables is one primarily increasing bandwidth trill (mainly due maximum frequency), theme, length, mainly...
Latitudinal variation in patterns of evolution has fascinated biologists for over a century, but our understanding latitudinal differences evolutionary processes-such as selection and drift-remains limited. Here, we test for, find, accelerated color bird taxa that breed at higher latitudes compared with those breeding the tropics, analyzing data from seven diverse avian families. Most important, show extent overlap species' ranges (degree sympatry) explains elevated rate pattern latitudes....
Adaptive radiations have helped shape how we view animal speciation, particularly classic examples such as Darwin's finches, Hawaiian fruitflies and African Great Lakes cichlids. These ‘island’ are comparatively recent, making them interesting because the mechanisms that caused diversification still in motion. Here, identify a new case of recent bird radiation within continentally distributed species group; capuchino seedeaters comprise 11 Sporophila originally described on basis differences...
Abstract Dispersal can impact population dynamics and geographic variation, thus, genetic approaches that establish which landscape factors influence connectivity have ecological evolutionary importance. Mixed models account for the error structure of pairwise datasets are increasingly used to compare relating differentiation measures resistance. A model selection framework based on information criteria metrics or explained variance may help disentangle influencing structure, yet there...
Climate change models often assume similar responses to temperatures across the range of a species, but local adaptation or phenotypic plasticity can lead plants and animals respond differently temperature in different parts their range. To date, there have been few tests this assumption at scale continents, so it is unclear if large-scale problem. Here, we examined that insect taxa show 96 sites grassy habitats North America. We sampled insects with Malaise traps during 2019-2021 (N = 1041...
ABSTRACT Patterns and levels of allozyme variation among populations Amazonian frogs were used to test the riverine barrier hypothesis species differentiation. Two frog sampled from each two main forest habitats on both banks Juruá River in southwestern Brazilian Amazon Basin at various points along its course contrast different strengths. Scarthyla ostinodactyla Scinax rubra flooded ( varzea ), Physalaemus petersi Epipedobates femoralis non‐flooded terra firme ). All showed high...
The forests of the upper Amazon basin harbour some world's highest anuran species richness, but to date we have only sparsest understanding distribution genetic diversity within and among in this region. To quantify region-wide genealogical patterns test for presence deep intraspecific divergences that been documented other neotropical anurans, developed a molecular phylogeny wide-spread terrestrial leaflitter frog Eleutherodactylus ockendeni (Leptodactylidae) from 13 localities throughout...
Fishes living in icy seawater are usually protected from freezing by endogenous antifreeze proteins (AFPs) that bind to ice crystals and stop them growing. The scattered distribution of five highly diverse AFP types across phylogenetically disparate fish species is puzzling. appearance radically different AFPs closely related has been attributed the rapid, independent evolution these response natural selection caused sea level glaciations within last 20 million years. In at least one...
Abstract Dispersal is a fundamental attribute of species in nature and shapes population dynamics, evolutionary trajectories genetic variation across spatial temporal scales. It increasingly clear that landscape features have large impacts on dispersal patterns. Thus, understanding how individuals move through landscapes essential for predicting alterations. Information patterns, however, lacking many taxa, particularly reptiles. Eastern foxsnakes ( Mintoinus gloydi ) are marsh prairie...
An enduring problem in avian ecology and conservation is linking breeding wintering grounds of migratory species. As species populations vary the degree to which individuals from distinct locales mix on stop-over sites grounds, establishing connectivity informs our understanding population demography management. We present a new Bayesian approach for inferring birds unknown origins North America. incorporate prior information analysis genetic markers into geographic origin assignment based...
Abstract Global climate change has been implicated in phenological shifts for a variety of taxa. Amphibian species particular are sensitive to changes their environment due biphasic life history and restricted reproductive requirements. Previous research shown that not all temperate amphibian respond similarly the same suite climatic or environmental cues, nor individual necessarily uniform responses across range. We examined both timing spring emergence calling phenology eight anuran...
Closely related species of birds often differ markedly in their color patterns. Here we examine the influence breeding-range overlap (breeding sympatry) on evolution pattern differences a sample closely bird species. We used sister-lineage method to analyze 73 phylogenetically independent comparisons among 246 and 39 families worldwide. found that divergence patterns was greater between sympatric than allopatric lineages, but only at intermediate levels sympatry (50%-80% overlap). This...
Genetic monitoring using noninvasive samples provides a complement or alternative to traditional population methods. However, next-generation sequencing approaches typically require high quality DNA and the use of (e.g., scat) is often challenged by poor contamination nontarget species. One promising solution highly multiplexed approach called genotyping-in-thousands (GT-seq), which can enable cost-efficient genomics-based for populations based on noninvasively collected samples. Here, we...
Abstract Freshwater ecosystems are complex, diverse, and face multiple imminent threats that have led to changes in both structure function. It is urgent we develop standardize monitoring tools allow for rapid comprehensive assessment of freshwater communities understand their changing dynamics inform conservation. Environmental DNA surveys offer a means inventory monitor aquatic diversity, yet most studies focus on one or few taxonomic groups because technical challenges. In this study, (1)...
In the face of an increasing global human population and multiple anthropogenic environmental stressors including climate change, limitations relying solely on Western science approaches to mitigating impacts, conserving biodiversity, managing resources sustainably is apparent. Many Indigenous Peoples have lived sustainably as part their respective environments for millennia, passing conservation management practices down generations despite colonization genocide. Long-standing...
The geographical patterns of variation shown at 20 allozyme and non-enzymatic protein-coding loci, in 8 external, 12 skeletal morphological characters the rufous-collared sparrow, Zonotrichia capensis, were analyzed order to test local (genetic) adaptation hypothesis regarding origin maintenance vocal dialects birds. Approximately males collected from each four sites within six different dialect zones. There was significant variability both external morphology among all 24 groups. Average...