A5050755548- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Diatoms and Algae Research
- Isotope Analysis in Ecology
- Marine and fisheries research
- Microbial Community Ecology and Physiology
- Paleontology and Stratigraphy of Fossils
- Fire effects on ecosystems
- Fish Ecology and Management Studies
- Marine Bivalve and Aquaculture Studies
- Coral and Marine Ecosystems Studies
- Oceanographic and Atmospheric Processes
- Chromium effects and bioremediation
- Rangeland and Wildlife Management
- Atmospheric aerosols and clouds
- Remote Sensing in Agriculture
- Aquatic Ecosystems and Phytoplankton Dynamics
- Geochemistry and Elemental Analysis
- Remote Sensing and Land Use
- Atmospheric chemistry and aerosols
- Aquatic Invertebrate Ecology and Behavior
- Species Distribution and Climate Change
- Protist diversity and phylogeny
- Soil Moisture and Remote Sensing
- Ocean Acidification Effects and Responses
University of Rhode Island
2020-2023
University of California, Santa Barbara
2015-2022
The goal of the EXport Processes in Ocean from RemoTe Sensing (EXPORTS) field campaign is to develop a predictive understanding export, fate, and carbon cycle impacts global ocean net primary production. To accomplish this goal, observations export flux pathways, plankton community composition, food web processes, optical, physical, biogeochemical (BGC) properties are needed over range ecosystem states. Here we introduce first EXPORTS deployment Station Papa Northeast Pacific during summer...
Changes in iron (Fe) bioavailability influence diatom physiology and community composition, thus have a profound impact on primary productivity ecosystem dynamics. Iron limitation of growth rates has been demonstrated both oceanic coastal waters the Northeast Pacific Ocean is predicted to become more pervasive future oceans. However, it unclear how strategies utilized by phytoplankton cope with low Fe resupply differ across these ocean provinces. We investigated response communities variable...
Summary A mix of adaptive strategies enable diatoms to sustain rapid growth in dynamic ocean regions, making one the most productive primary producers world. We illustrate such strategy off coastal California that facilitates continued, high, cell division rates despite silicic acid stress. Using a fluorescent dye measure single‐cell diatom silica production rates, silicification (silica per unit area) and we show decrease maintain rate when silicon concentration limits rates. While this...
Abstract Food webs trace the flow of organic matter and energy among producers consumers; for pelagic marine food webs, network complexity directly influences amount form carbon exported to deep ocean via biological pump. Here we present a synoptic view mixed layer web dynamics observed during late summer 2018 EXport Processes in Ocean from Remote Sensing (EXPORTS) field campaign subarctic Northeast Pacific at long-running time-series site, Station Papa. Carbon biomass reservoirs...
Abstract To identify the effect of microzooplankton grazing on phytoplankton abundance and size structure, we quantified growth herbivorous rates throughout euphotic zone across a light gradient North Pacific EXport Processes in Ocean from RemoTe Sensing (EXPORTS) cruise near Station Papa. During 30 days continuous, Lagrangian observation August September 2018, depth integrated chlorophyll (Chl ) concentrations were stable averaged 20 ± 2 mg m −2 . Bottle‐incubation experiments revealed that...
Abstract The California Current System displays a strong seasonal cycle in water properties, circulation, and biological production. Interactions of the alongshore current with coastal topographic features lead to high spatial variability forced by winds that displace surface offshore. This process also supplies nutrients euphotic zone Ekman transport eventually supports phytoplankton blooms typically dominated diatoms. Here, we investigate relationship between biogenic silica production...
Diatoms require silicic acid to construct ornately detailed cell walls called frustules. The growth and geographic distribution of diatoms is often controlled by the availability acid. Analytical methods exist assess diatom community biogenic silica (bSiO2) production, but partitioning production among taxa has been largely qualitative. We present a method for quantitative analysis taxa-specific through labeling with fluorescent dye PDMPO...
The abundance and size distribution of plankton in the surface ocean are key metrics to understanding primary export production, food web dynamics, optical properties water column. Here we quantified cell phytoplankton species from mono-specific laboratory cultures, using optical, electrical, image-based benchtop instrumentation. Moreover, combined particle fractionated chlorophyll a (Chl a) analysis with image estimate community composition comparing high low biomass station North Atlantic...
Abstract The Thomas Fire ignited on December 4, 2017 and burned for over one month. As the burned, Santa Ana winds carried a thick plume of smoke ash Barbara Channel. We sought to determine whether deposition Channel had measurable effect concentration stable carbon isotopic composition (δ 13 C) dissolved black (DBC) in coastal waters. DBC is condensed aromatic fraction thermally altered organic quantified using benzenepolycarboxylic acid (BPCA) method. δ C signatures were determined via...
Abstract Herbivorous consumption of primary production is a key transformation in global biogeochemical cycles, directing matter and energy either to higher trophic levels, export production, or remineralization. Grazing by microzooplankton often poorly constrained, particularly dynamic coastal systems. Temperate areas are seasonally spatially variable, which presents both challenges opportunities identify patterns drivers grazing pressure. Here we report on two winter one summer week‐long...
Abstract The metabolic activity and growth of phytoplankton taxa drives their ecological function contribution to biogeochemical processes. We present the first quantitative, taxon‐resolved silica production rates, content estimates for co‐occurring diatoms along two cross‐shelf transects off California coast using fluorescent tracer 2‐(4‐pyridyl)‐5‐((4‐(2‐dimethylaminoethylaminocarbamoyl)methoxy)phenyl)oxazole, confocal microscopy. Taxon total diatom community was predominantly a surface...
Ocean acidification is a threat to many marine organisms, especially those that use calcium carbonate form their shells and skeletons. The ability accurately measure the system first step in characterizing drivers behind this threat. Due logistical realities, regular sampling not possible nearshore ocean habitats, particularly remote, difficult-to-access locations. autonomously situ relieves of challenges; however, it always two required parameters autonomously. Observed relationships...
Abstract In the California Current Ecosystem, upwelled water low in dissolved iron (Fe) can limit phytoplankton growth, altering elemental stoichiometry of particulate matter and macronutrients. Iron-limited diatoms increase biogenic silica (bSi) content >2-fold relative to that organic carbon (C) nitrogen (N), which has implications for export efficiency given ballasted nature silica-based diatom cell wall. Understanding molecular physiological drivers this altered cellular would...
New production (NP) and net community (NCP) measurements are often used as estimates of carbon export potential from the mixed layer ocean, an important process in regulation global climate. Diverse methods can be to measure NP NCP, research vessels, autonomous platforms, remote sensing, each with its own set benefits uncertainties. The various rarely applied simultaneously a single location, limiting our ability for direct comparisons resulting measurements. In this study, we evaluated NCP...
Abstract Transitions in phytoplankton community composition are typically attributed to ecological succession even physically dynamic upwelling systems like the California Current Ecosystem (CCE). An expected from a high‐chlorophyll (~ 10 μ g L −1 ) diatom‐dominated assemblage low‐chlorophyll (< 1.0 non‐diatom dominated was observed during 2013 summer event CCE. Using an interdisciplinary field‐based space‐for‐time approach leveraging both biogeochemical rate measurements and...
Results from our 2017 cruise to the Santa Barbara Channel illustrate value that student leadership training can bring ocean science.The Across Channel: Investigating Diel Dynamics (ACIDD) mission, conducted December 16 22, 2017, aboard R/V Sally Ride, was led by two PhD students as co-principal investigators and chief scientists (authors Bisson Baetge
Coccolithophores are an important group of calcifying marine phytoplankton. Although coccolithophores not silicified, some species exhibit a requirement for Si in the calcification process. These also possess novel protein (SITL) that resembles SIT family transporters found diatoms. However, nature transport is yet known, making it difficult to determine wider role coccolithophore biology. Here, we show SITLs act as Na+ -coupled when expressed heterologous systems and similar characteristics...
Abstract Phytoplankton biomass is routinely estimated using relationships between cell volume and carbon (C) nitrogen (N) content that have been defined diverse plankton span orders of magnitude in size. Notably, has traditionally with geometric approximations shape dimensions from planar two-dimensional (2D) images, which requires assumptions about the third, depth dimension. Given advances image processing, we examined how volumes determined three-dimensional (3D), confocal images affected...