Temporal variation in the biochemical ecology of lower trophic levels in the Northern California Current

Miller, Jessica A.; Peterson, William T.; Copeman, Louise A.; Du, Xiuning; Morgan, Cheryl A.; Litz, Marisa N.C.

doi:10.1016/j.pocean.2017.05.003

Cited by 30 publications

(12 citation statements)

References 52 publications

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“…It might be argued that the relatively low DHA/EPA in copepods in the SoG is related to a low DHA/EPA in phytoplankton. However, it has been shown that even with POM DHA/EPA ≤ 1, copepod DHA/EPA consistently ranged from 0.4-1.5 45 . Thus, the FA composition at the base of the food chain in the SoG should be adequate to provide zooplankton with higher DHA/EPA than found in this study.…”

Section: Discussionmentioning

confidence: 99%

Seasonal and spatial dynamics of the planktonic trophic biomarkers in the Strait of Georgia (northeast Pacific) and implications for fish

Costalago

Forster

Nemcek

et al. 2020

Sci Rep

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Fish growth and survival are largely determined by the nutritional quality of their food, and the fish that grow quickly during early life stages are more likely to reproduce. to adequately estimate the quality of the prey for fish, it is necessary to understand the trophic links at the base of the food-web. Trophic biomarkers (e.g., stable isotopes and fatty acids) are particularly useful to discriminate and quantify food-web relationships. We explored the connections between plankton food-web components, and the seasonal and spatial dynamics of the trophic biomarkers and how this determines the availability of high-quality prey for juvenile Pacific salmon and Pacific herring in the Strait of Georgia, Canada. We demonstrate that the plankton food-web in the region is largely supported by diatom and flagellate production. We also show that spatial differences in terms of energy transfer efficiency exist in the region. further, we found that the fatty acid composition of the zooplankton varied seasonally, matching a shift from diatom dominated production in the spring to flagellate dominated production in the summer. this seasonal shift conferred a higher nutritional value to zooplankton in the summer, indicating better quality prey for juvenile salmon and herring during this period.

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Section: Discussionmentioning

confidence: 99%

Seasonal and spatial dynamics of the planktonic trophic biomarkers in the Strait of Georgia (northeast Pacific) and implications for fish

Costalago

Forster

Nemcek

et al. 2020

Sci Rep

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“…Geophysical Research Letters 10.1002/2017GL076199 decrease of total diatom abundance (Table 2) and a 50% decrease in species richness, indicating potential impacts upon the higher trophic predators (Edwards & Richardson, 2004). For example, a shift to an increased dominance of dinoflagellates would lead to nutritional quantity and quality changes due to differential essential fatty acids between diatoms and dinoflagellates (and other flagellates) (Dalsgaard et al, 2003;Miller et al, 2017;Suchy et al, 2016).…”

Section: Discussionmentioning

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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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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“…Journal of Geophysical Research: Oceans 10.1002/2017JC012952 There are differences in the lipid content of these groups of copepods-northern species are relatively lipid-rich whereas southern species are relatively lipid-poor. Thus, the bioenergetic content of the pelagic food web has a pronounced seasonal component, lipid rich in spring-summer and lipid poor in winter [Hooff and Peterson, 2006;Lee et al, 2006;Miller et al, 2017].…”

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confidence: 99%

The pelagic ecosystem in the Northern California Current off Oregon during the 2014–2016 warm anomalies within the context of the past 20 years

et al. 2017

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A warm anomaly in the upper ocean, colloquially named “the Blob,” appeared in the Gulf of Alaska during the calm winter of 2013–2014, spread across the northern North Pacific (NP) Ocean, and shifted eastward and onto the Oregon shelf. At least 14 species of copepods occurred which had never been observed in shelf/slope waters off Oregon, some of which are known to have NP Gyre affinities, indicating that the source waters of the coastal “Blob” were likely of both offshore (from the west) and subtropical/tropical origin. The anomalously warm conditions were reduced during strong upwelling in spring 2015 but returned when upwelling weakened in July 2015 and transitioned to downwelling in fall 2015. The extended period of warm conditions resulted in prolonged effects on the ecosystem off central Oregon, lasting at least through 2016. Impacts to the lower trophic levels were unprecedented and include a novel plankton community composition resulting from increased copepod, diatom, and dinoflagellate species richness and increased abundance of dinoflagellates. Additionally, the multiyear warm anomalies were associated with reduced biomass of copepods and euphausiids, high abundance of larvaceans and doliolids (indictors of oligotrophic ocean conditions), and a toxic diatom bloom (Pseudo‐nitzschia) throughout the California Current in 2015, thereby changing the composition of the food web that is relied upon by many commercially and ecologically important species.

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Temporal variation in the biochemical ecology of lower trophic levels in the Northern California Current

Cited by 30 publications

References 52 publications

Seasonal and spatial dynamics of the planktonic trophic biomarkers in the Strait of Georgia (northeast Pacific) and implications for fish

Seasonal and spatial dynamics of the planktonic trophic biomarkers in the Strait of Georgia (northeast Pacific) and implications for fish

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

The pelagic ecosystem in the Northern California Current off Oregon during the 2014–2016 warm anomalies within the context of the past 20 years

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