A5016661329- Marine and fisheries research
- Fish Ecology and Management Studies
- Marine Bivalve and Aquaculture Studies
- Coral and Marine Ecosystems Studies
- Marine animal studies overview
- Oceanographic and Atmospheric Processes
- Marine and coastal plant biology
- Isotope Analysis in Ecology
- Fish Biology and Ecology Studies
- Marine and coastal ecosystems
- Climate variability and models
- Avian ecology and behavior
- Species Distribution and Climate Change
- Mercury impact and mitigation studies
- Hydrology and Watershed Management Studies
- Marine Biology and Ecology Research
- Arctic and Antarctic ice dynamics
- Genetic and phenotypic traits in livestock
- Animal Behavior and Reproduction
- Healthcare Systems and Practices
- Public Health and Environmental Issues
- Hydrology and Sediment Transport Processes
- Water resources management and optimization
- Animal Vocal Communication and Behavior
- Trauma and Emergency Care Studies
NOAA National Marine Fisheries Service Southwest Fisheries Science Center
2016-2025
NOAA National Marine Fisheries Service Northwest Fisheries Science Center
2023-2025
NOAA National Marine Fisheries Service
2015-2024
Humboldt State University
2024
National Oceanic and Atmospheric Administration
2007-2023
Oregon State University
2023
University of California, Santa Cruz
2007-2018
Old Dominion University
2000-2003
Abstract The advent of an ecosystem‐based approach dramatically expanded the scope fisheries management, creating a critical need for new kinds data and quantitative approaches that could be integrated into management system. Ecosystem models are needed to codify relationships among drivers, pressures resulting states, quantify trade‐offs between conflicting objectives. Incorporating ecosystem considerations requires moving from single‐species used in stock assessments, more complex include...
Abstract Climate change and increased variability intensity of climate events, in combination with recovering protected species populations highly capitalized fisheries, are posing new challenges for fisheries management. We examine socio-ecological features the unprecedented 2014–2016 northeast Pacific marine heatwave to understand potential causes record numbers whale entanglements central California Current crab fishery. observed habitat compression coastal upwelling, changes availability...
We quantified Mg:Ca, Mn:Ca, Sr:Ca, and Ba:Ca molar ratios from an area representing the summer 2000 growth season on otoliths scales 1-year-old westslope cutthroat trout Oncorhyncus clarki lewisi collected three streams in Coeur d'Alene River, Idaho, system. also water during used regressions to model assimilation of various into scales. Otolith scale chemistries were linearly related Sr:Ca water. The partition coefficients for are higher this freshwater system than experimental results a...
Analysis of monthly coastal upwelling intensities revealed two seasonal and biologically relevant 'modes' in the California Current Ecosystem (CCE). The first mode reflected during summer months was characterized by low-frequency (multidecadal) processes, including significant (P<0.01) linear trends at some latitudes. In contrast, second wintertime defined higher-frequency variability associated with North Pacific High El Niño Southern Oscillation events. These modes were compared...
Studies of predator–prey demographic responses and the physical drivers such relationships are rare, yet essential for predicting future changes in structure dynamics marine ecosystems. Here, we hypothesize that vary spatially association with underlying ocean conditions, leading to observable rates, as reproduction. To test this hypothesis, quantified spatio-temporal variability hydrographic krill, forage fish model predator (seabird) over 18 years (1990–2007). We used principal component...
2022 marked the third consecutive La Niña and extended longest stretch of negative Oceanic Niño Index since 1998-2001. While physical biological conditions in winter spring largely adhered to prior conditions, summer fall were very different. Similar past events, coastal upwelling was either average or above average, temperature below salinity generally average. In fall, however, slightly close chlorophyll a Again, as during biomass northern/southern copepods above/below off Oregon winter,...
ABSTRACT Aim Long‐term monitoring data at the biogeographic scale are essential for developing baselines of biodiversity patterns and tools to diagnose natural cycles, trends, anomalous events assess threats from climate change. However, studies using these often limit their analyses relatively few metrics that may not adequately capture breadth biodiversity. Here, we calculate a suite compositional functional metrics—collectively comprising ecoscapes—to better resolve assemblage‐level...
Abstract Variations in large‐scale atmospheric forcing influence upwelling dynamics and ecosystem productivity the California Current System (CCS). In this paper, we characterize interannual variability of North Pacific High over 40 years investigate how variation its amplitude position affect biology. We develop a winter “pre‐conditioning” index demonstrate utility to understanding biological processes. Variation NPH can be well described by areal extent maximum pressure, which turn is...
Abstract Santora, J. A., Sydeman, W. J., Schroeder, I. D., Reiss, C. S., Wells, B. K., Field, C, Cossio, A. M., and Loeb, V. 2012. Krill space: a comparative assessment of mesoscale structuring in polar temperate marine ecosystems. – ICES Journal Marine Science, 69: . The spatial organization, variability, habitat associations krill within portions the Antarctic Peninsula California Current ecosystems are compared. Using decade acoustic observations remotely sensed oceanography (2000–2009),...
Abstract To be robust and informative, marine ecosystem models assessments require parameterized biophysical relationships that rely on realistic water column characteristics at appropriate spatial temporal scales. We examine how hydrographic properties off California from 1990 through 2010 during late winter spring correspond to krill juvenile rockfish ( Sebastes spp.) abundances. evaluated coherence among temperature, salinity, depth of 26.0 potential density isopycnal, stratification...
Elucidating connections between ocean climate variability and change recruitment of juvenile fishes to adult populations is critical for understanding in stock–recruit dynamics. Recruitment rockfish the California Current Ecosystem (CCE) highly variable, leading short- long-term changes abundance, productivity, forage availability, potential fisheries yield. We used regional model output, oceanographic data, a 34-year time series pelagic investigate interaction CCE source waters, as...
Upwelling ecosystems are characterized by intense seasonal productivity that supports highly dynamic species populations, high diversity of mid and upper trophic levels, a myriad important fisheries. Climate variability long-term change will impact upwelling intensity, timing persistence, thereby potentially threatening resilience coastal food webs stability ecosystem services. The spatial footprint cool upwelled waters in the surface mixed-layer transfer ultimately area water eastern...
We investigated the hypothesis that strontium:calcium (Sr:Ca), cadmium:calcium (Cd:Ca), and barium:calcium (Ba:Ca) composition in scales reflects of ambient seawater which fish were reared under controlled experimental conditions. Juvenile spot (Leiostomus xanthurus) held replicate tanks containing four different concentrations Sr, Cd, Ba maintained at either 20 or 25°C for a total 42 days. The elemental from these was analyzed termination experiment, using isotope dilution inductively...
Abstract We model age‐specific growth rates of Chinook salmon ( Oncorhynchus tshawytscha ) with two life‐history behaviors from Alaska (i. Situk and ii.Taku Rivers), Puget Sound, Washington (iii., iv. Skagit River), California (v. Smith River) relative to oceanic conditions in those regions. By analyzing over 20 yr biological physical data the NE Pacific downwelling, upwelling, transition zones, we are able determine factors affecting across much species’ range between behaviors. With scale...
Abstract Human impacts (e.g., fishing, pollution, and shipping) on pelagic ecosystems are increasing, causing concerns about stresses marine food webs. Maintaining predator–prey relationships through protection of hotspots is crucial for conservation management living resources. Biotic components pelagic, plankton‐based, exhibit high variability in abundance time space (i.e., extreme patchiness), requiring investigation persistence across trophic levels to resolve hotspots. Using a 26‐yr...