A5044723297- Fish Ecology and Management Studies
- Hydrology and Sediment Transport Processes
- Aquatic Invertebrate Ecology and Behavior
- Isotope Analysis in Ecology
- Hydrology and Watershed Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Marine and fisheries research
- Soil and Water Nutrient Dynamics
- Soil erosion and sediment transport
- Ecology and biodiversity studies
- Geology and Paleoclimatology Research
- Crustacean biology and ecology
- Fish biology, ecology, and behavior
- Marine Bivalve and Aquaculture Studies
- Fish Biology and Ecology Studies
- Wildlife Ecology and Conservation
- Land Use and Ecosystem Services
- Marine and coastal ecosystems
- Aquatic and Environmental Studies
- Genetic diversity and population structure
- Aquatic Ecosystems and Phytoplankton Dynamics
- Rangeland and Wildlife Management
- Environmental DNA in Biodiversity Studies
- Marine Biology and Ecology Research
- Water Quality and Resources Studies
Winona State University
2010-2024
University of Idaho
1993-1998
University of Memphis
1987-1995
Abstract We propose an integrated, heuristic model of lotic biocomplexity across spatiotemporal scales from headwaters to large rivers. This riverine ecosystem synthesis (RES) provides a framework for understanding both broad, often discontinuous patterns along longitudinal and lateral dimensions river networks local ecological various temporal smaller spatial scales. Rather than posing completely new model, we arrange conceptual marriage eco‐geomorphology (ecological aspects fluvial...
Our current views of the structure and function large river ecosystems are based primarily on three influential still valuable riverine models: (1) continuum concept, or RCC (e.g., Vannote et al. 1980); (2) serial discontinuity concept (Ward Stanford 1983), which integrated effects dams reservoirs RCC; (3) flood pulse in river-floodplain systems (Junk 1989) its relationship to (Sedell 1989). With regard food webs rivers, these models accentuated importance nutrients derived from either...
This paper addresses the river heterotrophy paradox, “How can animal biomass within riverine food webs be fueled primarily by autochthonous autotrophic production if ecosystem as a whole is heterotrophic?”. Reviewed, stable isotope data from tropical, temperate, and arctic rivers provide evidence consistent with revised productivity model (RPM): “The primary, annual energy source supporting overall metazoan species diversity in mid‐ to higher‐trophic levels of most (≥4th order) primary...
Assignment of values for natural ecological benefits and anthropocentric ecosystem services in riverine landscapes has been problematic, because a firm scientific basis linking these to the river's physical structure absent.We highlight some inherent problems this process suggest possible solutions on hydrogeomorphic classification rivers.We link can be useful fair asset trading (mitigation offsets), selection sites rehabilitation, cost/benefit decisions incremental steps restoring...
Abstract Resilience in river ecosystems requires that organisms must persist the face of highly dynamic hydrological and geomorphological variations. Disturbance events such as floods droughts are postulated to shape life history traits support resilience, but management conservation would benefit from greater understanding emergent effects communities organisms. We unify current knowledge taxonomic‐, phylogenetic‐, trait‐based aspects might aid identification quantification resilience...
Summary 1. Riverscapes consist of the main channel and lateral slackwater habitats along a gradient hydrological connectivity from maximum connection in to minimum backwaters. Spatiotemporal differences water currents this produce dynamic habitat conditions that influence species diversity, population densities trophic interactions fishes. 2. We examined importance gradients for food web dynamics Upper Mississippi River during spring (high flow, moderately low temperatures) summer (low...
Abstract Rivers are among the most extensively modified ecosystems globally. Identifying linkages between critical drivers of change and ecological response is challenging because myriad ways rivers modified. This study examines longer‐term relationships (>70 years) trophic status fish historical flow changes in Mississippi Basin. The regime each river regulated but differs terms character hydrological modification. Tissue samples from specimens obtained museum collections were used for...
ABSTRACT Hydrological connectivity is an important driver of ecosystem structure in floodplain rivers; however, little known how hydrological affects the and functioning food webs these systems. This study examines aquatic web 10 lakes on a dryland river eastern Australia across gradient. Results for fishes suggest that benthic carbon sources are more high billabongs than low pelagic billabongs. Fishes less connected were also found to feed at higher trophic levels We hypothesize billabongs,...
The interplay of hydrology, geomorphology, and ecology within an aquatic-terrestrial landscape makes floodplain rivers among the world's most complex ecosystems. Their spatial temporal variability create diverse communities with trophic interactions. Floodplain-rivers are, unfortunately, also those environments heavily impacted by human activities. Analysis extent ecological change in these as a direct result altered hydrological geomorphological conditions is typically limited to...
1. In situ exclosure experiments in the Mississippi and Ohio Rivers determined importance of fish predation regulating zebra mussels ( Dreissena polymorpha ), an increasingly important constituent benthic invertebrate assemblages both rivers. 2. We evaluated effects predatory on density, biomass size distribution a floodplain reach upper River naturally constrained River. Fifty, six‐sided, predator‐exclusion cages fifty ‘partial’ (mesh at upstream end only) were deployed, with half...
A laboratory experiment and natural-diet study were conducted to examine the feeding ecology importance of food type for growth Gammarus fasciatus from Ohio River. To determine effects on growth, amphipods fed four diets: (1) filamentous algae (Cladophora) diatoms, (2) dead animal matter (chironomids), (3) coarse particulate organic (CPOM), (4) fine (FPOM). Organic was obtained by shredding preconditioned sycamore leaves (Platanus occidentalis). Growth evaluated weekly measurements head...
Abstract The Mississippi and Missouri Rivers experienced flooding in 1993 that fell outside the annual predictable flood period of spring early summer. Flooding began late June, peaked July (25 232 m 3 /s on upper 21 240 Missouri) remained at or near stage into October 1993. This study was performed to determine if disturbance by an unpredicted event would alter trophic dynamics river–floodplain systems creating shifts composition organic matter available consumers. Ohio River, which did not...
Abstract Large floodplain rivers in dryland regions are becoming increasingly modified through water resource developments. Identifying ecosystem responses these systems is challenging because of their natural variability, limited data, and the myriad ways they modified. This study used organic samples from snail, mussel, fish specimens obtained museum collections for determination carbon nitrogen stable isotope ratios, Barwon‐Darling River, Australia, between 1869 2005, a period extensive...
Abstract Large riverine landscapes are among the most productive ecosystems on earth, and affected by humans. Few studies explicitly explore effects of, or responses to, multiple stressors in highly modified large river systems. Changes fish assemblages response to anthropogenic were explored from a 60‐year data set for Illinois River (Illinois, USA). Despite legacy of stressors, responded additional especially four distinct stressor phases, which included two policies improve water quality...