Assistant Unit Leader - Massachusetts Cooperative Fish and Wildlife Research Unit
Research Interests
Allison's research broadly revolves around characterizing anthropogenic impacts on aquatic ecosystems and identifying conservation strategies for effectively protecting and restoring watersheds. The growing human population continues to constrain biotic assemblages in a variety of ways, and understanding the mechanisms by which urbanization and its associated stressors result in degraded fish assemblages is an overarching challenge of her research program. She is interested in examining effects of altered hydrology, temperature, habitat, water quality, and food resources on stream fishes; quantifying sublethal (e.g., behavior, physiology) responses of fishes to urbanization; and assessing potential for management (e.g., forested riparian buffers, green infrastructure, dam removal) to restore fish assemblages.
Teaching Interests
At the University of Massachusetts Amherst, Allison teaches Research Concepts for first-year graduate students and Aquatic Ecology for advanced undergraduate and graduate students. In the past, she has taught graduate classes in Stream Ecology and Watershed Theory & Management, and undergraduate classes in the areas of Ecology, Conservation Biology, and Environmental Science.
Professional Experience
Unit Leader, Massachusetts Cooperative Fish and Wildlife Research Unit, 2020-
Assistant Unit Leader, Massachusetts Cooperative Fish and Wildlife Research Unit, 2012-2019
Education and Certifications
Ph D The University of Georgia 2004
MS The University of Georgia 2000
BS Allegheny College 1998
Science and Products
Urbanization and stream ecology: Moving the bar on multidisciplinary solutions to wicked urban stream problems
Toward improved prediction of streamflow effects on freshwater fishes
Homeowners’ willingness to adopt environmentally beneficial landscape practices in an urbanizing watershed
Hydrology of annual winter water level drawdown regimes in recreational lakes of Massachusetts, United States
Daily patterns of river herring (Alosa spp.) spawning migrations: Environmental drivers and variation among coastal streams in Massachusetts
Annual winter water-level drawdowns influence physical habitat structure and macrophytes in Massachusetts, USA, lakes
Feeling the squeeze: Adult run size and habitat availability limit juvenile river herring densities in lakes
Impacts of small dams on stream temperature
Understanding effects of small dams on benthic metabolism and primary production in temperate forested streams
Evaluating the effects of barriers on Slimy Sculpin movement and population connectivity using novel sibship-based and traditional genetic metrics
Effects of stream temperature and substrate type on emergence patterns of Plecoptera and Trichoptera from northeastern United States headwater streams
Annual winter water level drawdowns limit shallow-water mussel densities in small lakes
Framework for Protecting Aquatic Biodiversity in the Northeast Under Changing Climates
Increasing Tribal Climate Adaptive Capacity for Coastal Resources in the Northeast
Rethinking Lake Management for Invasive Plants Under Future Climate: Sensitivity of Lake Ecosystems to Winter Water Level Drawdowns
Projecting the Future of Headwater Streams to Inform Management Decisions
Stream Temperature and Dissolved Oxygen Responses to Small Dams and Dam Removal in Massachusetts
In-vitro Propagation and Fish Assessments to Inform Restoration of Dwarf Wedgemussel (Alasmidonta Heterodon)
Science and Products
- Publications
Filter Total Items: 28
Urbanization and stream ecology: Moving the bar on multidisciplinary solutions to wicked urban stream problems
Decades of research on the effects of urbanization on stream ecology have shown that urban stream problems are inherently wicked. These problems are wicked in the sense that they are difficult to solve because information is incomplete, changing, or conflicting and because finding potential solutions often requires input from stakeholders who can have conflicting and competing values. The 5th SympAuthorsMegan L. Fork, Kristina G. Hopkins, Jessica Chappell, Robert J. Hawley, Sujay S. Kaushal, Brian M. Murphy, Blanca Ríos-Touma, Allison H. RoyToward improved prediction of streamflow effects on freshwater fishes
Understanding the effects of hydrology on fish populations is essential to managing for native fish conservation. However, despite decades of research illustrating streamflow influences on fish habitat, reproduction and survival, biologists remain challenged when tasked with predicting how fish populations will respond to changes in flow regimes. This uncertainty stems from insufficient understandAuthorsMary Freeman, Kevin R. Bestgen, Daren Carlisle, Emmanuel A. Frimpong, Nathan R. Franssen, Ketih B. Gido, Elise R. Irwin, Yoichiro Kanno, Charles H. Luce, S. Kyle McKay, Meryl C. Mims, Julian D. Olden, N. LeRoy Poff, David L. Propst, Laura Rack, Allison H. Roy, Edward S. Stowe, Annika W. Walters, Seth J. WengerHomeowners’ willingness to adopt environmentally beneficial landscape practices in an urbanizing watershed
Streams in urbanizing watersheds often experience low flows in summer due to increased water use for residential landscaping and decreased base flow as impervious land cover limits aquifer recharge. Environmentally beneficial landscape practices that save water and infiltrate runoff have the potential to provide multiple ecological benefits including reducing stress on urban streams, but can faceAuthorsJohanna Stacy, Robert L. Ryan, Allison H. Roy, Anita MilmanHydrology of annual winter water level drawdown regimes in recreational lakes of Massachusetts, United States
Annual winter water level drawdown (WD) is a common lake management strategy to maintain recreational value by controlling nuisance macrophytes and preventing ice damage to shoreline infrastructure in lakes of the northeastern United States. The state of Massachusetts provides general guidelines for lake managers to implement and practice WDs. However, WD management reporting is not required and aAuthorsJason R. Carmignani, Allison H. Roy, Jason Stolarski, Todd RichardsDaily patterns of river herring (Alosa spp.) spawning migrations: Environmental drivers and variation among coastal streams in Massachusetts
The timing of life history events in many plants and animals depends on the seasonal fluctuations of specific environmental conditions. Climate change is altering environmental regimes and disrupting natural cycles and patterns across communities. Anadromous fishes that migrate between marine and freshwater habitats to spawn are particularly sensitive to shifting environmental conditions and thusAuthorsHenry Legett, Adrian Jordaan, Allison H. Roy, John Sheppard, Marcelo Somos-Valenzuela, Michelle StaudingerAnnual winter water-level drawdowns influence physical habitat structure and macrophytes in Massachusetts, USA, lakes
Annual wintertime water-level drawdowns are a common management strategy in recreational lakes; however, few studies have estimated their relative impact on lake littoral habitat among a set of typically co-occurring anthropogenic stressors including lakeshore development and herbicide application. Within 21 Massachusetts, USA lakes that represented a drawdown magnitude gradient (0.07–2.26 m), weAuthorsJason R. Carmignani, Allison H. RoyFeeling the squeeze: Adult run size and habitat availability limit juvenile river herring densities in lakes
Maximum densities of juvenile river herring (Alewife Alosa pseudoharengus and Blueback Herring A. aestivalis) vary among freshwater lakes, likely due to densities of adult spawners. Differences in habitat availability and lake water quality may also contribute to variation in juvenile river herring productivity between populations, yet these relationships have not been tested across a large geograAuthorsMatthew T. Devine, Julianne Rosset, Allison H. Roy, Benjamin I. Gahagan, Michael P. Armstrong, Andrew R. Whiteley, Adrian JordaanImpacts of small dams on stream temperature
Small, surface-release dams are ubiquitous features of the landscape that typically slow water flow and decrease canopy cover through impounded reaches, potentially increasing stream temperatures. However, reported effects of small dams on water temperature are variable, likely due to differences in landscape and dam characteristics. To quantify the range of thermal effects of small dams, we deploAuthorsPeter A. Zaidel, Allison H. Roy, Kristopher M. Houle, Beth Lambert, Benjamin Letcher, Keith H. Nislow, Christopher SmithUnderstanding effects of small dams on benthic metabolism and primary production in temperate forested streams
Dams can alter the chemical and physical conditions of downstream environments by increasing stream temperatures, altering nutrient limitation, reducing flow variability, and reducing fine sediment deposition. However, little is known about how fundamental stream ecosystem processes like productivity and respiration respond to dams. Nutrient diffusing substrates were installed in three dam streamsAuthorsJohn P. Ludlam, Allison H. RoyEvaluating the effects of barriers on Slimy Sculpin movement and population connectivity using novel sibship-based and traditional genetic metrics
Population genetics-based approaches can provide robust and cost-effective ways to assess the effects of potential barriers, including dams and road-stream crossings, on the passage and population connectivity of aquatic organisms. Determining the best way to apply and modify genetic tools for different species and situations is essential for making these genetics-based approaches broadly applicabAuthorsSpencer Y. Weinstein, Jason A. Coombs, Keith H. Nislow, Chris Riley, Allison H. Roy, Andrew R. WhiteleyEffects of stream temperature and substrate type on emergence patterns of Plecoptera and Trichoptera from northeastern United States headwater streams
The timing and spatial distribution of aquatic insect emergence is linked to the abiotic and biotic environment in streams. Studies of aquatic insect emergence are needed to generate baseline data to identify potential shifts in phenology and habitat-related emergence with global change. The purpose of this study was to 1) compare the timing of Plecoptera (stonefly) species emergence between two sAuthorsKristin N. Cheney, Allison H. Roy, Robert F. Smith, Edward R. DeWaltAnnual winter water level drawdowns limit shallow-water mussel densities in small lakes
Regulated water level fluctuations alter the physical, chemical, and biological environments in lakes. However, few studies have measured the effects of repeated annual winter drawdowns on freshwater mussel populations (Bivalvia: Unionida), and it is unknown whether drawdowns permanently constrain mussel populations to deeper depths or are resilient to the annual disturbance.We quantified mussel dAuthorsAllison H. Roy, Jason R. Carmignani, Peter D. Hazelton, Holly Giard - Science
Framework for Protecting Aquatic Biodiversity in the Northeast Under Changing Climates
Aquatic ecosystems provide habitat and migration corridors to a myriad of species, including plants, fishes, amphibians, birds, mammals, and insects. These ecosystems typically contain relatively higher biodiversity than their terrestrial counterparts; yet, aquatic biodiversity loss in North America is occurring at a rate five times faster than in terrestrial ecosystems. One of the major causes ofIncreasing Tribal Climate Adaptive Capacity for Coastal Resources in the Northeast
Fish that migrate between fresh and salt waters, called diadromous fishes, are integral to coastal Tribal cultures as subsistence foods. Throughout their Northeast range, diadromous fish populations have shown strong declines over recent decades due to the combined impacts of habitat loss, pollution, overfishing, and climate change. These changes have led to decreasing access to traditional subsisRethinking Lake Management for Invasive Plants Under Future Climate: Sensitivity of Lake Ecosystems to Winter Water Level Drawdowns
Small lakes are important to local economies as sources of water supply and places of recreation. Commonly, lakes are considered more desirable for recreation if they are free of the thick weedy vegetation, often comprised of invasive species, that grows around the lake edge. This vegetation makes it difficult to launch boats and swim. In order to reduce this vegetation, a common technique in theProjecting the Future of Headwater Streams to Inform Management Decisions
There is growing evidence that headwater stream ecosystems are especially vulnerable to changing climate and land use, but managers are challenged by the need to address these threats at a landscape scale, often through coordination with multiple management agencies and landowners. This project sought to provide an example of cooperative landscape decision-making by addressing the conservation of - Data
Stream Temperature and Dissolved Oxygen Responses to Small Dams and Dam Removal in Massachusetts
Small, surface-release dams are ubiquitous across the U.S. and have the potential to alter stream flow, impede sediment and nutrient transport, and fragment biotic assemblages. To mitigate these and other ecological impacts and reduce public safety hazards, dam removal has become an increasingly prevalent method of stream restoration. However, few streams have been consistently monitored before anIn-vitro Propagation and Fish Assessments to Inform Restoration of Dwarf Wedgemussel (Alasmidonta Heterodon)
The dwarf wedgemussel (Alasmidonta heterodon) is a federally endangered freshwater mussel that once ranged from New Brunswick to North Carolina, but now only exists in isolated populations throughout its diminished range. Laboratory propagation in conjunction with augmentation or reintroduction is considered a critical component of dwarf wedgemussel restoration. The presented data aimed to I) deve