A5015205688- Fish Ecology and Management Studies
- Marine and fisheries research
- Environmental DNA in Biodiversity Studies
- Aquatic Invertebrate Ecology and Behavior
- Impact of Light on Environment and Health
- Wildlife Ecology and Conservation
- Myxozoan Parasites in Aquatic Species
- Water Quality and Resources Studies
- Isotope Analysis in Ecology
- Land Use and Ecosystem Services
- Parasite Biology and Host Interactions
- Hydrology and Sediment Transport Processes
- Aquaculture disease management and microbiota
- Marine animal studies overview
- Coastal wetland ecosystem dynamics
- Economic and Environmental Valuation
- Species Distribution and Climate Change
National Oceanic and Atmospheric Administration
2019-2024
University of California, Santa Cruz
2017-2024
NOAA National Marine Fisheries Service
2019-2024
NOAA National Marine Fisheries Service Southwest Fisheries Science Center
2019-2024
Abstract Predator–prey dynamics can have landscape‐level impacts on ecosystems, and yet, spatial patterns environmental predictors of predator–prey are often investigated at discrete locations, limiting our understanding the broader impacts. At these scales, landscapes contain multiple complex heterogeneous habitats, requiring a spatially representative sampling design. This challenge is especially pronounced in California’s Sacramento–San Joaquin River Delta, where managers require...
Abstract There is currently only a limited understanding of the relationship between water quality and predation on Pacific salmon Oncorhynchus spp. smolts. We addressed hypothesis that poor will decrease smolt's swimming performance presumably its predator evasion capabilities. Predation major factor affecting smolt survival throughout San Joaquin River Sacramento–San Delta California. Prior studies have quantified rates, but effect capability has not previously been evaluated. juvenile...
Abstract Predation of juvenile salmonids within California’s Sacramento–San Joaquin Delta (the Delta) has been identified as a contributing factor to low survival during out‐migration through the system. Artificial lighting at night (ALAN) may contribute increased levels salmonid predation by attracting predators and prey, increasing predator reaction distance, boosting foraging success. To assess ALAN effects on (piscivorous fishes) density relative risk Chinook Salmon Oncorhynchus...
Abstract Artificial light at night (ALAN) has emerged as a prevalent anthropogenic stressor in many aquatic ecosystems impacting wide range of taxa and ecological processes. In fishes, ALAN attracts both predators prey, potentially resulting increased predation mortality sublethal impacts. Increased is especially problematic anadromous given that populations are diminished out‐migrating juveniles must transit illuminated waterways. Additionally, management complex, because lighting benefits...
Abstract Programs to control predatory fishes have successfully increased the survival of imperiled prey in some cases, but efficacy depends on population dynamics and ecological interactions between predators, prey, rest community. In California's Sacramento–San Joaquin Delta, extremely low downstream‐migrating juvenile salmonids has been ascribed part predation by abundant nonnative that become naturalized system. This study aimed determine effectiveness removing these fish increase San...
Abstract The Sacramento–San Joaquin Delta (hereafter, “the Delta”) is one of the estuaries with most invasive species in world, and nonnative predators may be a major factor observed decline Central Valley Chinook Salmon Oncorhynchus tshawytscha over recent decades. In order for managers to take actions that might reduce predation‐related mortality these ecologically, culturally, economically valuable fish, it important understand factors influencing distribution abundance piscivores Delta....
hinook Salmon (Oncorhynchus tshawytscha) are increasingly vulnerable to anthropogenic activities and climate change, especially at their most southern range in California’s Central Valley. There is considerable interest understanding stressors that contribute population decline identifying management actions reduce the effects of those stressors. Along west coast North America, disease has been linked declining numbers salmonids, identified as a key stressor results mortality. In Valley,...
Current estimates of the threatened southern distinct population segment North American green sturgeon ( Acipenser medirostris) combine a plot-sampling density estimator with Dual frequency IDentification SONar (DIDSON) and adaptive resolution imaging sonar (ARIS) data. From 2020 to 2022, we annually collected images all known aggregations compared established method an N-mixture model using side-scan images. We 18 different combinations chose overdispersed Poisson that produced estimated...
The Sacramento–San Joaquin Delta has been invaded by several species of non-native predatory fish that are presumed to be impeding native population recovery efforts. Since eradication predators is unlikely, there substantial interest in removing or altering manmade structures the may exacerbate predation on (contact points). It these physical influence predator-prey dynamics, but how habitat features interactions poorly understood, and could remediated benefit have not inventoried...
Abstract Water diversions that support agricultural and municipal use result in fish mortality through entrainment impingement. Additionally, this infrastructure may attract both predators prey fishes, thereby increasing predation rates near these anthropogenic contact points. The Sacramento–San Joaquin Delta (the Delta) California's Central Valley is a tidal freshwater ecosystem exports large volumes of water for while at the same time providing valuable migratory rearing habitat imperilled...
This study investigated how the deployment of juvenile Chinook salmon in ambient river conditions and subsequent exposure to infection by pathogens was associated with changes expression genes involved immune system functioning, general stress host development. Juvenile fish were deployed sentinel cages for 21 days Sacramento River, CA, USA. Gill, kidney intestinal tissue sampled at 0, 7, 14 post-deployment. Pathogen detection response assessed a combination molecular histopathological...