Freya Rowland

Freya Rowland
United States Geological Survey | USGS · Columbia Environmental Research Center

PhD Ecology

About

21
Publications
4,003
Reads
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160
Citations
Introduction
I am interested in using experiments, observational data, and statistical models to describe ecosystem behavior. Most of my work is aquatic, and I've worked on everything from storm sewers to the Laurentian Great Lakes.
Additional affiliations
August 2019 - July 2021
Yale University
Position
  • PostDoc Position
June 2018 - August 2019
University of Michigan
Position
  • PostDoc Position
June 2013 - June 2018
University of Missouri
Position
  • PhD Student

Publications

Publications (21)
Article
Understanding drivers of metapopulation dynamics remains a critical challenge for ecology and conservation. In particular, the degree of synchrony in metapopulation dynamics determines how resilient a metapopulation is to a widespread disturbance. In this study, we used 21 years of egg mass count data across 64 nonpermanent freshwater ponds in Conn...
Article
We developed a Bayesian hierarchical modeling framework to establish a short-term forecasting model of particulate cyanobacterial toxin concentrations in Western Lake Erie using chlorophyll a concentration as the predictor. The model evolves over time with additional data to reflect the changing dynamics of cyanobacterial toxin production. Specific...
Article
Establishing tributary load (i.e., the mass exported over a period of time) targets to reduce anthropogenic nutrient inputs to receiving waters — and thus eutrophication — is a common mitigation strategy in freshwater and coastal ecosystems. However, detecting and quantifying trends can be difficult because annual precipitation strongly influences...
Preprint
Subsidies of matter between ecosystems can strongly affect trophic interactions in food webs, yet most experiments apply a binary (i.e., subsidy vs. no subsidy) approach. This emphasis on extremes implicitly assumes linear relationships and fails to capture potential nonlinear effects in ecosystem responses along gradients of subsidy amount seen in...
Article
Full-text available
Direct and indirect effects both influence population and community dynamics. The relative strengths of these pathways are often compared using experimental approaches, but their evaluation in situ has been less frequent. We examined how individual and aggregate impacts of direct and indirect effects of species densities, proxies for competition an...
Article
Despite the initial success of extensive efforts to reduce phosphorus (P) loading to Lake Erie as part of the Great Lakes Water Quality Agreement, Lake Erie appears to be undergoing a re-eutrophication and is plagued by harmful algal blooms. To offer insights into potential lake responses under differing Maumee River loads and reveal recent changes...
Article
Full-text available
Neonicotinoid insecticides are highly water soluble with relatively long half-lives, which allows them to move into and persist in aquatic ecosystems. However, little is known of the impacts of neonicotinoids on non-target vertebrates, especially at sublethal concentrations. We evaluated the effects of the neonicotinoid clothianidin on the behavior...
Article
Full-text available
This is one of few studies to comprehensively examine seasonality and phytoplankton nutrient deficiency in sub-tropical lakes over multiple years, to our knowledge. We tested whether phytoplankton communities in two sub-tropical impoundments in the mid-hills of Nepal were nitrogen (N)-, phosphorus (P)-, or co-deficient in N and P across pre-monsoon...
Article
Full-text available
Biological control of mosquitoes can have unintended ecological consequences. One example is the introduction of the genus Gambusia Poey, 1854 into ponds and wetlands. Gambusia spp. are invasive in many parts of the world and have the potential to alter ecosystems by changing trophic interactions and extirpating amphibians. We sought to determine w...
Article
Full-text available
Variation in the timing of breeding (i.e., phenological variation) can affect species interactions and community structure, in part by shifting body size differences between species. Body size differences can be further altered by density-dependent competition, though synergistic effects of density and phenology on species interactions are rarely e...
Article
Full-text available
Understanding metapopulation dynamics requires knowledge about local population dynamics and movement in both space and time. Most genetic metapopulation studies use one or two study species across the same landscape to infer population dynamics; however, using multiple co-occurring species allows for testing of hypotheses related to different life...
Article
Full-text available
Primary production can be controlled through bottom–up (e.g., resources) or top–down (e.g., predators) constraints. Two key bottom–up resources in small aquatic systems are light and nutrients, and forest canopy cover heavily influences these factors, whereas amphibian and invertebrate colonizers exert top–down pressure as grazers and predators. We...
Article
Full-text available
Ecological ?1 and evolutionary processes commonly result in morphological variation among larval amphibians. Variation in head shape plays a critical role in both food capture and predation risk in gape-limited salamanders, yet in situ studies of head shape variability are rare outside of cannibal morph assessments. We examined allometry difference...
Article
Full-text available
Bottom-up effects such as the availability of light and nutrients can have large impacts on primary producer quantity and quality, which is then translated into the growth and development of consumers. The use of “canopy cover” as a bottom-up predictive factor is a broad categorization, as canopy cover controls both the amount of light allowed into...
Article
Full-text available
The amount of energy flowing to top trophic levels depends on primary production and the efficiency at which it is converted to production at each trophic level. In aquatic systems, algal production is often limited by light and nutrients, and the nutritional quality of algae depends on the relative balance of these two resources. In this study, we...
Article
Full-text available
Teaching philosophy statements typically improve over time with teaching experience and instruc-tional self-knowledge. Graduate students without this experience and self-knowledge risk producing lackluster statements when apply-ing for academic positions. This study identifies components of a biology education course that posi-tively affected the d...
Conference Paper
Background/Question/Methods As the base of the food chain, primary producers heavily influence the efficiency of carbon (C) and energy transfer not only to primary consumers, but further up the food chain as well. Once the basic carbon requirements of an organism are met, food quality rather than quantity may determine how efficiently energy and C...
Article
Full-text available
Zooplankton grazing is important in resolving residual variation around the total phosphorus - chlorophyll a relationship. In empirical studies, zooplankton body size is often a better predictor of residual variation than zooplankton biomass. We investigate whether higher measurement error associated with zooplankton biomass may explain its lower p...

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