A5006881352- Marine and fisheries research
- Oceanographic and Atmospheric Processes
- Marine animal studies overview
- Coral and Marine Ecosystems Studies
- Marine and coastal ecosystems
- Marine Bivalve and Aquaculture Studies
- Fish Ecology and Management Studies
- Marine and coastal plant biology
- Avian ecology and behavior
- Marine Biology and Ecology Research
- Arctic and Antarctic ice dynamics
- Isotope Analysis in Ecology
- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Ocean Acidification Effects and Responses
- Coastal and Marine Management
- Underwater Acoustics Research
- Healthcare Systems and Practices
- Cephalopods and Marine Biology
- Identification and Quantification in Food
- Environmental Conservation and Management
- Public Health and Environmental Issues
- Trauma and Emergency Care Studies
- Reservoir Engineering and Simulation Methods
- Polar Research and Ecology
University of California, Santa Cruz
2013-2024
NOAA National Marine Fisheries Service Southwest Fisheries Science Center
2014-2024
NOAA National Marine Fisheries Service
2014-2024
National Oceanic and Atmospheric Administration
2011-2023
NOAA Pacific Marine Environmental Laboratory
2011
NOAA National Marine Fisheries Service Northwest Fisheries Science Center
2010
Farallon Institute
2010
Mote Marine Laboratory
2010
Changes in the amplitude and phasing of seasonal events (phenology) can affect functioning marine ecosystems. Phenology plays a particularly critical role eastern boundary ecosystems, which are driven largely by cycle coastal upwelling. Here we develop describe set indicators that quantify timing, evolution, intensity, duration upwelling California Current large ecosystem (CCLME). There is significant interannual variability characteristics during 1967–2007, with extended periods high...
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...
Historical hydrographic data (1984–2012) from the California Cooperative Oceanic Fisheries Investigations (CalCOFI) program and global reanalysis products were used to quantify recent water mass variability off coast of Southern California. Dissolved oxygen concentrations continued decline within lower pycnocline, concurrent with strong increases in nitrate phosphate that have spatial patterns matching those dissolved oxygen. Silicic acid also shows an increasing trend offshore portion...
Environmental DNA (eDNA) metabarcoding is a new approach for assessing marine biodiversity that may overcome challenges of traditional monitoring and complement both existing surveys assessments. There are limited eDNA studies evaluate vertebrate in the environment or compare patterns with methods. This study uses mitochondrial 12S rRNA genes present seawater samples to characterize distribution within National Marine Sanctuaries located California Current upwelling ecosystem. The epipelagic...
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...
Abstract The California Current System represents a confluence of different water masses originating in the subarctic, subtropical, and tropical eastern Pacific. Variations their relative influence can alter regional biogeochemistry ecosystem structure. We perform an optimum multiparameter analysis on historical hydrographic data to quantify spatiotemporal variability mass contributions Current. Within pycnocline, strong cross‐shore gradient primary source reflects dominant advective...
The California Current System (CCS) has experienced large fluctuations in environmental conditions recent years that have dramatically affected the biological community. Here we synthesize remotely sensed, hydrographic, and survey data from throughout CCS 2019–2020 to evaluate how changes community dynamics at multiple trophic levels. A marine heatwave formed north Pacific 2019 reached second greatest area ever recorded by end of summer 2020. However, high atmospheric pressure early 2020...
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...
Due to their global distribution, high biomass and energy content, euphausiids (krill) are important prey for many mid upper trophic level marine organisms. Understanding drivers of krill habitat is essential forecasting range shifts, better understand the response predators climate change. We hypothesized that distribution abundance species derived from ecosystem surveys in spring/summer relates geomorphic features, coastal upwelling during preceding winter, spring mesoscale oceanographic...
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 In the California Current System (CCS), changes in phenology (i.e., seasonal timing) of coastal upwelling alter functioning this productive marine ecosystem. Recently developed indices that account for strength and nutrient flux to surface provide a more complete understanding bottom‐up forcing region. Using these indices, we describe CCS phenological variability vertical transport flux. Physical biogeochemical spring transitions generally co‐occur winter or spring, followed by...
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...
Chronologies developed from annual growth-increment widths of splitnose rockfish ( Sebastes pinniger ) and yelloweye ruberrimus otoliths were compared with time series lay date fledgling success for the common murre Uria aalge Cassin’s auklet Ptychoramphus aleuticus in north-central California Current. All exactly dated spanned 1972 through 1994. In a principal components analysis, leading component (PC1 bio accounted 64% variance data set. By entering upwelling index, Northern Oscillation...
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...
Abstract Forecasting weather has become commonplace, but as society faces novel and uncertain environmental conditions there is a critical need to forecast ecology. Forewarning of ecosystem during climate extremes can support proactive decision-making, yet applications ecological forecasts are still limited. We showcase the capacity for existing marine management tools transition forecasting configuration provide skilful up 12 months in advance. The use ocean temperature anomalies help...
[1] Given the importance of nitrate in sustaining high primary production and fishery yields eastern boundary current ecosystems, it is desirable to know amounts this nutrient reaching euphotic zone through upwelling process. Because such measurements are not routinely available, we developed predictive models water-column (0–200 m) based on temperature for a region California Current System (30–47°N) within 50 km from coast. Prediction was done using generalized additive compilation 37,607...