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Charlie J.G. Loewen

Charlie J.G. Loewen

PhD in Ecology; BSc in Environmental Biology

About

22
Publications
1,776
Reads
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617
Citations
Citations since 2016
21 Research Items
613 Citations
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2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
Introduction
Charlie J.G. Loewen is an incoming Assistant Professor at Iowa State University. Charlie does research in the fields of Community Ecology, Macroecology, Global Change Biology, Limnology, Biogeography, and Conservation Science.

Publications

Publications (22)
Article
Multiple factors operating across different spatial and temporal scales affect beta‐diversity—the variation in community composition among sites. Disentangling the relative influence of co‐occurring ecological drivers over broad biogeographic gradients and time is critical to developing mechanistic understandings of community responses to natural e...
Article
Human‐assisted introductions of exotic species are a leading cause of anthropogenic change in biodiversity; however, context dependencies and interactions with co‐occurring stressors impede our ability to predict their ecological impacts. The legacy of historical sportfish stocking in mountainous regions of western North America creates a unique, n...
Article
Full-text available
Integration of species traits in direct gradient analysis generates insights into how communities are assembled and may respond to environmental changes. We investigated phytoplankton trait-environment relationships for over 300 taxa during the open-water season across 75 north-temperate lakes and reservoirs in Alberta, Canada. An innovative, data-...
Article
Aim Recurrent species assemblages integrate important biotic interactions and joint responses to environmental and spatial filters that enable local coexistence. Here, we applied a bipartite (site–species) network approach to develop a natural typology of lakes sharing distinct fish faunas and provide a detailed, hierarchical view of their bioregio...
Article
Full-text available
Climate warming is a ubiquitous stressor in freshwater ecosystems, yet its interactive effects with other stressors are poorly understood. We address this knowledge gap by testing the ability of three contrasting null models to predict the joint impacts of warming and a range of other aquatic stressors using a new database of 296 experimental combi...
Article
Models applying space-for-time substitution, including those projecting ecological responses to climate change, generally assume an elevational and latitudinal equivalence that is rarely tested. However, a mismatch may lead to different capacities for providing climatic refuge to dispersing species. We compiled community data on zooplankton, ectoth...
Preprint
Climate warming is a ubiquitous stressor in freshwater ecosystems, yet its interactive effects with other stressors are poorly understood. We address this by testing the ability of three contrasting null models to predict the joint impacts of warming and a second stressor using a new database of 296 experimental combinations. Despite concerns that...
Preprint
Climate warming is an important stressor in freshwater ecosystems, yet its interactive effects with other environmental changes are poorly understood. We address this challenge by testing the ability of three contrasting null models to predict the joint impacts of warming and a second stressor using a new database of 296 experimental combinations....
Article
Exploratory analysis of biological communities and their environmental factors requires specialized tools to identify associations among variables and generate hypotheses about their causal relationships. Despite the ubiquity of multivariate data in ecology, the visualization and interpretation of such data can be challenging. This study introduces...
Preprint
Multiple factors operating across different spatial and temporal scales affect b-diversity, the variation in community composition among sites. Disentangling the relative influence of co-occurring ecological drivers over broad biogeographic gradients and time is critical to developing mechanistic understanding of community responses to natural envi...
Article
Disentangling the environmental and spatial drivers of biological communities across large scales increasingly challenges modern ecology in a rapidly changing world. Here, we investigate the hierarchical and trait‐based organization of regional and local factors of zooplankton communities at a macroscale of 1,240 mountain lakes and ponds spanning w...
Article
Cumulative impacts of multiple stressors on freshwater biodiversity and ecosystem function likely increase with elevation, thereby possibly placing alpine communities at greatest risk. Here, consideration of species traits enables stressor effects on taxonomic composition to be translated into potential functional impacts. We analyzed data for 47 t...
Article
Species diversity is often an implicit source of biological insurance for communities against the impacts of novel perturbations, such as the introduction of an invasive species. High environmental heterogeneity (e.g., a mountainous gradient) is expected to beget greater regional species diversity and variation in functional traits related to envir...
Article
The accelerating rate of global change has focused attention on the cumulative impacts of novel and extreme environmental changes (i.e., stressors), especially in marine ecosystems. As integrators of local catchment and regional processes, freshwater ecosystems are also ranked highly sensitive to the net effects of multiple stressors, yet there has...

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Projects

Projects (2)
Archived project
Examination of Long-Term Data-Sets to establish patterns. Derived on this information I will develop a program for proper experiments and large scale programs in order to further our understanding of controlling the potential future problem
Archived project
(1) Determine taxonomic variation in phytoplankton and cyanobacteria communities (Beta-diversity) across a diverse set of north-temperate lakes and reservoirs in Alberta, Canada, using spatially-constrained null models obtained by Moran Spectral Randomization to differentiate between spatially-structured, spatially-independent, and spuriously correlated associations within a suite of local and regional environmental variables; (2) Assess the functional trait structure of phytoplankton and cyanobacteria communities across a diverse set of north-temperate lakes and reservoirs in Alberta, Canada, using optimized RLQ and Fourth-corner analyses to reveal dominant trait-environment relationships and provide empirical evidence of community response to accelerating climate and human land-use changes.