A5078549836- Fish Ecology and Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Marine and fisheries research
- Crustacean biology and ecology
- Species Distribution and Climate Change
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Wildlife Ecology and Conservation
- Soil and Water Nutrient Dynamics
- Freshwater macroinvertebrate diversity and ecology
- Ecology and Vegetation Dynamics Studies
- Hydrology and Sediment Transport Processes
- Economic Zones and Regional Development
- Physiological and biochemical adaptations
- Ecology and biodiversity studies
- Fish biology, ecology, and behavior
- Hydrology and Watershed Management Studies
- Marine Biology and Ecology Research
- Genetic diversity and population structure
- Coastal wetland ecosystem dynamics
- Mathematical and Theoretical Epidemiology and Ecology Models
- Remote Sensing in Agriculture
- Migration, Aging, and Tourism Studies
- Wildlife-Road Interactions and Conservation
Wisconsin Department of Natural Resources
2015-2021
Abisko Scientific Research Station
2011-2020
Umeå University
2011-2020
University of Wisconsin–Madison
2006-2013
Utah State University
2006-2010
Summary 1. Biological invasions are widely recognised as a significant component of human‐caused environmental change and primary threat to native biodiversity. The negative impacts species particularly evident for freshwater crayfish faunas. 2. This study provides novel insight into the ecological effects non‐native on zoobenthic communities (with emphasis rusty crayfish, Orconectes rusticus ) across broad scales by combining meta‐analysis small‐scale experimental studies with long‐term...
Terrestrial ecosystems export large amounts of organic carbon (t‐OC) but the net effect this OC on productivity recipient aquatic is largely unknown. In study boreal lakes, we show that relative contribution t‐OC to individual top consumer (fish) biomass production, and most their potential prey organisms, increased with concentration dissolved (DOC; dominated by sources) in water. However, production consumers decreased increasing DOC, despite substantial use (up 60%) t‐OC. Thus, results...
The temperature dependence of predation rates is a key issue for understanding and predicting the responses ecosystems to climate change. Using simple mechanistic model, we demonstrate that differences in relative performances predator prey can cause strong threshold effects attack rates. Empirical data on rate northern pike ( Esox lucius ) feeding brown trout Salmo trutta confirm this result. Attack fell sharply below +11°C, which corresponded shift performance with respect maximum escape...
Summary 1. Invasive species frequently have adverse impacts on native communities and ecosystems. Management options are often limited. Our goal is to evaluate the effect of intensive trapping fish predation population dynamics an invasive crayfish. 2. From 2001 2005, we removed rusty crayfish ( Orconectes rusticus ) by in Sparkling Lake northern WI. In addition, Wisconsin Department Natural Resources restricted harvest known consume crayfish, thereby increasing that too small trap. 3. After...
Abstract A shift in the magnitude and timing of animal migrations is one most documented ecological effects climate change. Although are largely driven by spatial variation resource gradients, few studies connect expected changes primary production with geographic patterns migratory behavior. Here, we link lake to occurrence sea partially anadromous salmonid Arctic char ( Salvelinus alpinus L.). We compiled presence/absence records populations spanning productivity temperature gradients...
Controlling invasive species can restore ecosystems while also quantifying interaction strengths. We experimentally removed rusty crayfish (Orconectes rusticus) from a Wisconsin lake. Rusty abundance declined by 99% in 8 years and did not significantly increase 4 postharvest, with no compensatory recruitment response observed. Native virilis) sunfish (Lepomis spp.) abundances increased two orders of magnitude as declined, macrophyte cover 2–4 m waters. expected benthic macroinvertebrate...
A major area of current research is to understand how climate change will impact species interactions and ultimately biodiversity. variety environmental conditions are rapidly changing owing warming, these often affect both the strength outcome interactions. We used fish distributions replicated introductions investigate influencing coexistence two fishes in Swedish lakes: brown trout (Salmo trutta) pike (Esox lucius). logistic regression model showed that coexist large lakes (more than 4.5...
Improved methods are needed for the prevention and control of invasive species. We investigated potential to a rusty crayfish (Orconectes rusticus) population in an isolated lake northern Wisconsin by trapping adult restricting fishing, thereby increasing fish populations predation on small crayfish. Over 3 year period, traps predatory fishes removed substantial portions population. used age-structured model determine which removal method had largest effect growth rates. Because more were...
Summary 1. Analysis of drainage networks provides a framework to evaluate the densities and distributions prey species relative locations their predators. Upstream migration by diadromous shrimp ( Atya lanipes Xiphocaris elongata ) during life cycle access headwater refugia from fish predation, which is intense in estuaries coastal rivers. 2. We postulate that geomorphic barriers (such as large, steep waterfalls >3.5 m height), can directly limit distribution predatory fishes and,...
1. Overlapping river and road networks provide a framework for studying the complex interactions between natural human systems, with river-road intersections as focal areas of study. Roads can alter morphology stream channels, pose barriers to freshwater fauna, easy access streams humans non-native species accelerate expansion urban development. 2. We determined what variables control structure diadromous fish shrimp communities assessed whether particular crossings altered community in...
Abstract Water clarity is an important attribute of lakes, but climatic effects on remain obscure, because lake physical and chemical conditions generate complex responses. Here, we examine how hydrologic variation influences water (Secchi depth) over 30 yr across 24 lakes in northwest Wisconsin (U.S.A.) along a gradient phosphorus (P) concentration attributes (e.g., depth, area, land use, trophic status). We took multivariate time‐series approach to explore shared temporal patterns Secchi...
Crayfish often dominate freshwater ecosystems and can have strong effects on littoral habitat biota through foraging. However, there is substantial debate regarding the trophic role of crayfish implications their foraging behavior ecosystems. We created a bioenergetics model for rusty (Orconectes rusticus) to determine how growth prey choice constrain consumption, which affects simulated over 6400 potential diets by varying abundance important prey. judged amount identity that must consume...
Abstract Aim To incorporate dispersal through stream networks into models predicting the future distribution of a native, freshwater fish given climate change scenarios. Location Sweden. Methods We used logistic regression to fit and habitat data observed pike ( Esox lucius Linnaeus) distributions in 13,476 lakes. GIS map pathways streams. Lakes either (1) contained or were downstream from lakes, (2) upstream but natural barriers, (3) isolated streams barriers. then projections model...
Magee, MR, Hein CL, Walsh JR, Shannon PD, Vander Zanden MJ, Campbell TB, Hansen GJA, Hauxwell J, LaLiberte, GD, Parks TP, Sass GG, Swanston CW, Janowiak MK. 2019. Scientific advances and adaptation strategies for Wisconsin lakes facing climate change. Lake Reserv Manage. 35:364–381.Climate change threatens inland lakes, which are highly valued their ecological economic benefits. Here, we synthesize that could offset impacts on Midwestern lakes. Our synthesis is based results from the...
Abstract Lake-dwelling fish that form species pairs/flocks characterized by body size divergence are important model systems for speciation research. Although several sources of divergent selection have been identified in these systems, their importance driving the process remains elusive. A major problem is retrospect, we cannot distinguish pressures initiated from those acting later process. To address this issue, studied initial stages European whitefish (Coregonus lavaretus) using data...
Climate change is altering hydrologic regimes, with implications for lake water levels. While lakes within districts experience the same climate, may exhibit differential climate vulnerability regarding level response to drought. We took advantage of a recent drought (∼2005–2010) and estimated changes in area, level, shoreline position on 47 northern Wisconsin using high-resolution orthoimagery hypsographic curves. developed model predicting identify characteristics most vulnerable region,...
Abstract Understanding where, when, and how native species persist in the face of invasive species‐driven ecosystem change is critical for management conservation. In some cases, ecological interactions among are spatially structured, spatial segregation can be a key coexistence mechanism ecologically similar taxa. We evaluated 19‐years explicit crayfish community data from long‐term whole‐lake experiment, which includes 8 years rusty ( Faxonius rusticus ) removal followed by 11 post‐removal...
Predation might cause the disparate distributions of fish and shrimp in Puerto Rican streams. Adult (Atya lanipes) are present only above waterfalls that pose barriers to predatory fishes. Because we have not found Atya stomachs, think these amphidromous avoid predation by migrating locations as post-larvae. We designed experiments an artificial y-maze natural streams test whether In streams, adult avoided scent 2 fishes (Gobiomorus dormitor Agonostomus monticola) regardless had recently...
Despite lakes being a key part of the global water cycle and crucial resource, there is limited understanding whether regional or lake-specific factors control storage variations in small lakes. Here, we study groups small, unregulated North Carolina, Washington, Illinois, Wisconsin, USA using lake level measurements gathered by citizen scientists surface area from optical satellite imagery. We show to be highly accurate when compared automated gauges (mean absolute error = 1.6 cm). compare...
We carried out a set of experiments in small clear-water lake northern Sweden during summer 2010 to assess the effect organic C (OC) released from epipelic algae on pelagic bacterial production (BP). The release rate OC (dissolved and particulate) was ∼45.4 ng m−2 h−1. Bacterioplankton uptake dissolved P-limited, primary (PP) colimited by N P. Pelagic BP (3.2 ± 6 µg L−1 h−1) exceeded PP (0.012 0.008 h−1). higher water contact with sediments growing their surface than separated sediments....