Interannual variations in phytoplankton community structure in the northern California Current during the upwelling seasons of 2001-2010

Du, Xiuning; Peterson, William T.; O’Higgins, Linda

doi:10.3354/meps11097

Cited by 30 publications

(26 citation statements)

References 31 publications

(45 reference statements)

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“…Statistically, nutrient effects , particularly silicate and nitrate, on the warm mass group d were significant, which suggests that basin‐scale drivers could affect phytoplankton community structure by controlling local nutrients (Bograd et al, ; Di Lorenzo et al, ; Yasunaka et al, ), for example, by affecting the depth of the nutricline and stoichiometry (Jacox et al, ). However, local wind‐induced upwelling events have more direct effects on short‐term nutrient availability to phytoplankton growth and also to the selection of dominants (Du et al, ). The increased proportion of dinoflagellates and the toxic Pseudo‐nitzschia bloom in the warm mass group were likely related to the suppressed nitrate and silicate concentrations (Du et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Warm ocean events, such as strong El Niño and periods of positive Pacific Decadal Oscillation (PDO), have known negative impacts on the ecosystem of the California Current: reduced production of the upper trophic predators (Barber & Chavez, 1983;Peterson et al, 2014;Sydeman et al, 2006), increased frequency of harmful algal blooms (Du et al, 2011(Du et al, , 2016McCabe et al, 2016;McKibben et al, 2015McKibben et al, , 2017, and shifts in copepod community from lipid-rich to lipid-poor species (Fisher et al, 2015;Hooff & Peterson, 2006;Peterson & Keister, 2003). Warm ocean conditions suppress primary production (Thomas et al, 2009) and bring changes in phytoplankton community composition (Balech, 1959;Bolin & Abbott, 1963;Du et al, 2015;Venrick, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Phytoplankton Community Structure in 2011–2013 Compared to the Extratropical Warming Event of 2014–2015

Peterson

2018

Geophysical Research Letters

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Coastal waters of the Northern California Current experienced “normal” ocean conditions in 2011–2012, weak upwelling in 2013–2014, then suddenly warmed in September 2014. The response of phytoplankton community structure to contrasting ocean conditions was determined from samples collected off Newport, Oregon. Cluster analysis identified three prominent phytoplankton community types: one that occurred during the upwelling season characterized by the highest abundance and diversity of diatoms, a preupwelling/relaxation community characterized by lower abundance, lowest diversity of diatoms and dinoflagellates, and another one associated with the warm anomalies from September 2014 through 2015 with reduced diatom abundance and diversity but the highest dinoflagellate diversity. The changes of diatom and dinoflagellate community were correlated with local factors (silicate, silicate: nitrate ratios, temperature, and salinity), and with the Pacific Decadal Oscillation.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phytoplankton Community Structure in 2011–2013 Compared to the Extratropical Warming Event of 2014–2015

Peterson

2018

Geophysical Research Letters

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“…This work builds on previous studies in the southern CCS (Anderson et al 2008, Kim et al 2009, Venrick 2012) and northern CCS (Du et al 2015) that looked at environmental controls on nearshore phytoplankton abundance and community composition. These coastal time series are most relevant to human interactions with the ocean, while more open ocean time series may not be capturing all the dynamics that are occurring.…”

Section: Introductionmentioning

confidence: 89%

Phytoplankton and microbial abundance and bloom dynamics in the upwelling shadow of Monterey Bay, California, from 2006 to 2013

Schulien¹,

Peacock²,

Hayashi³

et al. 2017

Mar. Ecol. Prog. Ser.

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Wind-driven upwelling variability and local topography cause an upwelling shadow in the northern region of Monterey Bay, California, to persist seasonally. The present study applied partial least squares regression to a 7-yr time series collected within this retentive feature for the purpose of evaluating the environmental controls on total autotrophic phytoplankton (as chlorophyll a) and picoplankton (Synechococcus spp., picoeukaryotes, and heterotrophic bacteria) abundance. A bloom threshold was defined and applied to all biological groups to evaluate seasonal and inter-annual abundance patterns. Microbial and phytoplankton abundances in the upwelling shadow were positively associated with warmer, nutrient-depleted water. Consistent with these results, two-thirds of phytoplankton blooms occurred in October−November, when surface temperatures were warm and ammonium concentrations were greatest. These blooms were predominantly composed of dinoflagellates, 64% of which were known toxin-producing species. Although the overall relationship of phytoplankton to river discharge rates was negative, phytoplankton blooms in 2006, 2007, 2010, and 2012 followed early rainfall events, which flush nitrogen from the surrounding farms into the bay. Despite the fact that the regional measure of upwelling, the Bakun upwelling index, is seasonally low in the autumn, pulses of cold, nutrientreplete water were advected into the upwelling shadow, additionally supporting late-year blooms. Physical and chemical processes occurring over multiple time scales controlled bloom dynamics in the upwelling shadow of Monterey Bay.

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“…Low-frequency physical variability attributed to the PDO and ENSO modulates large shifts in NE Pacific water temperature, ocean currents, and foodweb dynamics that can persist for months to years (2,5,6). Shifts in NE Pacific plankton communities occur as well (7)(8)(9)(10)(11)(12); however, climate impacts on phytoplankton ecology in this region are relatively underexplored, largely due to a lack of phytoplankton data at sufficient scales.…”

mentioning

confidence: 99%

Climatic regulation of the neurotoxin domoic acid

McKibben

Peterson

Wood

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

128

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Domoic acid is a potent neurotoxin produced by certain marine microalgae that can accumulate in the foodweb, posing a health threat to human seafood consumers and wildlife in coastal regions worldwide. Evidence of climatic regulation of domoic acid in shellfish over the past 20 y in the Northern California Current regime is shown. The timing of elevated domoic acid is strongly related to warm phases of the Pacific Decadal Oscillation and the Oceanic Niño Index, an indicator of El Niño events. Ocean conditions in the northeast Pacific that are associated with warm phases of these indices, including changes in prevailing currents and advection of anomalously warm water masses onto the continental shelf, are hypothesized to contribute to increases in this toxin. We present an applied domoic acid risk assessment model for the US West Coast based on combined climatic and local variables. Evidence of regional-to basin-scale controls on domoic acid has not previously been presented. Our findings have implications in coastal zones worldwide that are affected by this toxin and are particularly relevant given the increased frequency of anomalously warm ocean conditions.T he Pacific Decadal Oscillation (PDO) and El Niño Southern Oscillation (ENSO) are recurring patterns of climate variability centered over the northeastern (NE) and equatorial Pacific, respectively, that fluctuate at scales of years (ENSO) to decades (PDO) (1, 2). Distinct, yet also related, these patterns can amplify or dampen each other through atmospheric teleconnection (1, 3). In the NE Pacific, they induce similar spatial patterns of sea surface temperature anomalies during positive (warm) and negative (cool) phases (4). Low-frequency physical variability attributed to the PDO and ENSO modulates large shifts in NE Pacific water temperature, ocean currents, and foodweb dynamics that can persist for months to years (2,5,6). Shifts in NE Pacific plankton communities occur as well (7-12); however, climate impacts on phytoplankton ecology in this region are relatively underexplored, largely due to a lack of phytoplankton data at sufficient scales.Decadal, regional-scale monitoring of domoic acid (DA) in shellfish can be used to investigate climate-scale impacts on phytoplankton ecology. The neurotoxin DA is produced by some species of the diatom genus Pseudo-nitzschia. It enters secondary trophic levels when suspension feeders such as shellfish and anchovies ingest toxic Pseudo-nitzschia cells. Consumption of these organisms by humans can lead to a serious neurological disorder named Domoic Acid Poisoning (DAP), also termed Amnesic Shellfish Poisoning. DAP symptoms range from gastrointestinal disturbance to seizures, memory loss, or, rarely, death (13,14).DA was first identified as a public health threat in 1987 (15). Toxin-producing Pseudo-nitzschia spp. and DA have since been identified worldwide with the greatest prevalence in, and most deleterious impacts on, productive eastern boundary upwelling systems (16). Laboratory experiments have found multiple ...

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Interannual variations in phytoplankton community structure in the northern California Current during the upwelling seasons of 2001-2010

Cited by 30 publications

References 31 publications

Phytoplankton Community Structure in 2011–2013 Compared to the Extratropical Warming Event of 2014–2015

Phytoplankton Community Structure in 2011–2013 Compared to the Extratropical Warming Event of 2014–2015

Phytoplankton and microbial abundance and bloom dynamics in the upwelling shadow of Monterey Bay, California, from 2006 to 2013

Climatic regulation of the neurotoxin domoic acid

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