A5050552075- Fish Ecology and Management Studies
- Medicinal Plant Research
- Aquatic Invertebrate Ecology and Behavior
- Insect Resistance and Genetics
- Insects and Parasite Interactions
- Parasite Biology and Host Interactions
- Insect Utilization and Effects
- Hydrology and Sediment Transport Processes
- Congenital limb and hand anomalies
- Freshwater macroinvertebrate diversity and ecology
- Date Palm Research Studies
- Insect Pheromone Research and Control
- Ecology and Conservation Studies
- Silk-based biomaterials and applications
- Aquatic Ecosystems and Phytoplankton Dynamics
- Aquatic life and conservation
- Marine and fisheries research
- Wildlife Ecology and Conservation
- Botany and Plant Ecology Studies
- Entomopathogenic Microorganisms in Pest Control
- Toxoplasma gondii Research Studies
- Microbial Community Ecology and Physiology
- Plant Taxonomy and Phylogenetics
- Myxozoan Parasites in Aquatic Species
- Conflict of Laws and Jurisdiction
University of Maine
2022-2025
United States Geological Survey
2022-2025
Oregon Department of Fish and Wildlife
2017-2023
Oregon State University
2015-2023
University of Girona
2013-2018
United States Department of Agriculture
2005
University of Colorado Boulder
2003
Abstract Ecosystems that are coupled by reciprocal flows of energy and nutrient subsidies can be viewed as a single “meta‐ecosystem.” Despite these connections, the flow is greatly asymmetrical seasonally pulsed. Here, we synthesize existing literature on stream–riparian meta‐ecosystems to quantify global patterns amount subsidy consumption organisms, known “allochthony.” These resource important since they comprise large portion consumer diets, but disrupted human modification streams...
Secondary production, the growth of new heterotrophic biomass, is a key process in aquatic and terrestrial ecosystems that has been carefully measured many flowing water ecosystems. We combine structural equation modeling with first worldwide dataset on annual secondary production stream invertebrate communities to reveal core pathways linking air temperature precipitation production. In United States, where most extensive set estimates covariate data were available, we show...
ABSTRACT Parasitological information may be useful for managing economically important fisheries by providing insights into population dynamics and health effects. The Chinook salmon ( Oncorhynchus tshawytscha ), an invasive species with high socio‐ecological importance in South America, supports recreational incipient artisanal fisheries. In Southern Chile, the recent approval of coastal returning some regions highlights understanding foraging, habitat use, commercial value. However, such...
The freshwater copepod Salmincola californiensis is an ectoparasite of Pacific salmon and trout ( Oncorhynchus spp.). High levels infection by this parasite can significantly damage gills result in blood loss, affecting the fitness survival hosts, it may hinder recovery efforts threatened endangered salmonids. Juvenile salmonids that rear reservoirs have been reported to experience higher rates than their stream-dwelling counterparts. To date, relationship between reservoir environmental...
Abstract Fish passage out of reservoirs is a critical issue for downstream movement juvenile salmonids and other migratory species. Reservoirs can delay migrations by salmon months or years. Here, we examine whether novel management activity implementing annual short‐term draining reservoir to streambed improves timely migration salmonids. We analyse 12 years fish capture data from screw trap located Fall Creek Reservoir (Oregon, USA) changes in timing the compare species composition pre‐...
Eastern Mosquitofish (Gambusia holbrooki) is an invasive and globally widespread species that considered highly tolerant. We used distribution models (SDMs) to assess factors, including the role of anthropogenic perturbation, mediate its invasion on a regional scale. A better understanding important large-scale factors may help us identify future areas concern potential avenues for control. built SDMs from presence records randomly selected pseudo-absences mosquitofish 10- × 10-km grid. 10...
Abstract Complex predator–prey interactions over time have the potential to limit survival of threatened native species. Reservoirs created by large dams in temperate ecosystems are sites where both coldwater and warmwater fish species overlap distributions, forming assemblages that would not occur under natural settings. For example, many western North American reservoirs, juvenile salmonids now with non‐native predators such as Northern Pikeminnow Ptychocheilus oregonensis bass Micropterus...
Large dams and their respective reservoirs provide renewable energy water security, but also can profoundly alter riverine ecosystems. Here, we present evidence of changing aquatic food web structure in the seasons following short-duration, extreme manipulation levels a reservoir (i.e., draining to original riverbed during fall assist outmigration juvenile Chinook Salmon). We find unintended lagged consequences transitioning from lake river, even temporarily, that resulted trophic shifts...
The importance of zooplankton as a food resource for higher trophic levels, including threatened and endangered salmon species, highlights the need to improve our understanding mechanisms that structure reservoir webs. Pelagic plankton are dominant primary secondary producers in reservoirs experiencing extreme water level fluctuations (WLFs). In these systems, we might expect WLFs promote predictable homogenized biotic communities. Here explored whether spring summer communities Pacific...
Salmincola californiensis is a Lernaeopodid copepod parasitizing Pacific salmon and trout of the genus Oncorhynchus. increasing concern in both native introduced ranges because its potential fish health impacts high infection prevalence intensity some systems. Discrepancies documented life history phenology S. with sister species edwardsii, as well our laboratory observations, led us to question existing literature. We naupliar stage, thought lost for californiensis. In addition, we found...
Abstract Biological invasions threaten species and ecosystems worldwide. Impacts from are especially prevalent in freshwaters, where managers have struggled to contain the problem. Conventional approaches managing invaders focus on prevention control. In practice, these measures proven be variably effective. Control or eradication of established is particularly difficult and, even if ecologically feasible, it may not socially desirable. Here we propose a new alternative invasive species:...
Hamilton SK, Murphy CA, Johnson SL, Pollock A. 2022. Water quality ramifications of temporary drawdown Oregon reservoirs to facitiliate juvenile Chinook salmon passage. Lake Reserv Manage. 38:165–179.Several high-head dams on the Willamette River system in create that support growth and survival anadromous salmonids but may impede downstream passage fishes, including dam creates Fall Creek Reservoir (also known as Lake). Managers have been conducting brief "deep drawdowns" promote threatened...
Abstract High‐head dams throughout the Willamette River Basin, Oregon create deep reservoirs that undergo inter‐seasonal and intra‐seasonal water‐level fluctuations (WLFs). The magnitude of WLFs is dependent on competing objectives flood control, recreation, water releases to maintain downstream habitat facilitate migration Endangered Species Act –listed salmonids. These are drawn down minimum conservation pool in winter, refilled full by late spring variable WLFs, typically between 4 15 m,...
Abstract Objective Dams and reservoirs can alter juvenile growth survival of migratory salmonids through several physical biological mechanisms. Juvenile Chinook Salmon Oncorhynchus tshawytscha that are produced upstream large hydropower dams may have associated passage mortality, but the created by these support rapid growth. Characterizing biotic drivers mortality in aid understanding cumulative effects river impoundments on salmonid populations. The purpose this study was to understand...
Abstract Natural history collections provide a wealth of information beyond the scope their initial purpose, including historical window into host–parasite relationships. For example, can reveal infections fishes by freshwater gill-maggot Salmincola californiensis, parasite increasing concern because negative effects on salmonids that use large reservoirs in western North America. Here, we examined 1,241 preserved specimens collected between 1933 and 2014 from Willamette River Basin, Oregon...
Abstract Regulated rivers downstream of dams often exhibit highly modified thermal regimes in addition to hydrologic regimes; river temperatures can be seasonally much warmer or cooler than unregulated streams. Selective water withdrawals used minimize impacts reaches. However, other quality parameters, in‐reservoir production, and species composition also vary with depth. In the South Fork McKenzie River, Pacific Northwest North America, an existing large dam was retrofitted mix export from...
Documenting species invasions and assessments of ecological changes depend on detection. Here, we present a simple design plankton light trap with specific wavelength LEDs modifications. We used PVC pipe to create standardised small, rigid, low-cost traps that can be deployed in lentic habitats. With cost under $30 US each, including lights rechargeable batteries, our are affordable without the need for disposable chemical lights. These small rely vacuum retain contents upon retrieval,...