Mesozooplankton biomass and grazing responses to Cyclone Opal, a subtropical mesoscale eddy

Landry, Michael R.; Décima, Moira; Simmons, Melinda P.; Hannides, Cecelia C. S.; Daniels, Emy F.

doi:10.1016/j.dsr2.2008.01.005

Cited by 64 publications

(57 citation statements)

References 55 publications

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“…In Hawaiian and Sargasso Sea eddies, zooplankton grazing was observed to be an important process controlling diatom blooms inside eddies (Benitez-Nelson and McGillicuddy, 2008;Goldthwait and Steinberg, 2008;Landry et al, 2008;Maiti et al, 2008). On the contrary, our results suggest that zooplankton grazing pressure had a minimum impact in the Canary Island eddy field.…”

Section: Eddy-field Influence On Organic Matter Fluxescontrasting

confidence: 54%

Regional and temporal variability of sinking organic matter in the subtropical northeast Atlantic Ocean: a biomarker diagnosis

et al. 2010

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Abstract. Sinking particles through the pelagic ocean have been traditionally considered the most important vehicle by which the biological pump sequesters carbon in the ocean interior. Nevertheless, regional scale variability in particle flux is a major outstanding issue in oceanography. Here, we have studied the regional and temporal variability of total particulate organic matter fluxes, as well as chloropigment and total hydrolyzed amino acid (THAA) compositions and fluxes in the Canary Current region, between 20-30 • N, during two contrasting periods: August 2006, characterized by warm and stratified waters, but also intense winds which enhanced eddy development south of the Canary Islands, and February 2007, characterized by colder waters, less stratification and higher productivity. We found that the eddyfield generated south of the Canary Islands enhanced by >2 times particulate organic carbon (POC) export with respect to stations (FF; far-field) outside the eddy-field influence. We also observed flux increases of one order of magnitude in chloropigment and 2 times in THAA in the eddy-field relative to FF stations. Principal Components Analysis (PCA) was performed to assess changes in particulate organic matter composition between stations. At eddy-field stations, higher chlorophyll enrichment reflected "fresher" material, while at FF stations a higher proportion of pheophytin indicated greater degradation due to microbes and microzooplankton. PCA also suggests that phytoplankton community structure, particularly the dominance of diatoms versus carbonate-rich plankton, is the major factor influencing the POC export within the eddy field. In February, POC export

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Section: Eddy-field Influence On Organic Matter Fluxescontrasting

confidence: 54%

Regional and temporal variability of sinking organic matter in the subtropical northeast Atlantic Ocean: a biomarker diagnosis

et al. 2010

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“…Both Goldthwait and Steinberg (2008) and Landry et al (2008b) found an increase in mesozooplankton biomass and grazing within MWE A4 and Cyclone Opal, respectively, which resulted in migrant mediated active export fluxes that were 43 and 50% of that measured within corresponding sediment trap deployments. Within Cyclone Opal, active transport may reconcile 15 N based nitrogen mass balance estimates (Landry et al, 2008b). However, active transport is still not sufficient to explain the magnitude of the oxygen deficits observed at depth in cyclone C1 or MWE A4 (Goldthwait and Steinberg, 2008).…”

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confidence: 99%

“…Observations within Cyclone Opal indicate that rapid microzooplankton grazing by large (> 50 μm) ciliates and dinoflagellates released suspended and dissolved organic matter (Landry et al, 2008b) rather than producing fecal pellets. This finding is consistent with mass balance estimates of nutrients and inorganic and organic carbon, which suggests that most of the new production within Cyclone Opal accumulated as dissolved organic matter (Chen et al, 2008).…”

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confidence: 99%

“…These studies also include the results of model formulations that confirm the importance of winds and topography on Hawaiian eddy formation and propagation (Calil et al, 2008). The second section delves into the plankton community response, with papers discussing nutrient distributions (Li and Hansell, 2008;Rii et al, 2008), plankton community structure (Bibby et al, 2008;Brown et al, 2008;Ewart et al, 2008;Rii et al, 2008), growth, grazing, and metabolic balance, (Bibby et al, 2008;Landry et al, 2008a;McAndrew et al, 2008) and the influence of eddies on higher trophic levels (Goldthwait and Steinberg, 2008;Landry et al, 2008b). The third section concentrates on the resulting impacts on biogeochemical cycling and export.…”

mentioning

confidence: 99%

“…Cyclone Noah, a 2.5-month-old mature feature when sampled, was characterized by relatively modest perturbations in chlorophyll and phytoplankton composition with respect to ambient conditions Rii et al, 2008). In contrast, younger and stronger Cyclone Opal contained a substantial diatom bloom that decayed during the nine days over which it was sampled (Brown et al, 2008;Landry et al, 2008b;Nencioli et al, 2008;Rii et al, 2008). Within the deep chlorophyll maximum (DCM) at Opal's center, photosynthetically active (high F v /F m ) diatoms, such as the chain-forming Chaetoceros spp.…”

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confidence: 99%

See 2 more Smart Citations

Mesoscale physical–biological–biogeochemical linkages in the open ocean: An introduction to the results of the E-Flux and EDDIES programs

Benitez-Nelson

McGillicuddy

2008

Deep Sea Research Part II: Topical Studies in Oceanography

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Mesoscale variability in the habitat of the Humboldt Current krill, spring 2007

et al. 2015

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Mesoscale eddies are prominent structures in the world's oceans generating a high degree of spatial and temporal heterogeneity that influences zooplankton distribution. Euphausiids (krill) are a key zooplankton group mainly inhabiting coastal upwelling areas where high productivity, advection, and eddy kinetic energy (EKE) play pivotal roles in the distribution and structure of zooplankton. We analyzed the spatial distribution of the Humboldt Current krill, Euphausia mucronata, in relation to environmental variability and mesoscale circulation during the 2007 austral spring. Using net-based zooplankton samples, remotely sensed environmental conditions, multivariate analysis, and generalized additive models, we described and tested the effect of oceanographic variability and mesoscale eddies on E. mucronata abundance and biomass. E. mucronata was significantly more abundant in coastal (97%) than oceanic habitats, and more abundant in cyclonic cores (mean: 76 indiv. m 22 ) than in surrounding waters (mean: 13-29 indiv. m 22 ).Abundance correlated to current and EKE fields at >10-20 cm s 21 and >50-200 cm 2 s 22 , respectively, and biomass correlated negatively to sea level anomaly and positively to alongshore winds. Krill abundance and biomass were also strongly coupled to both eddy dynamics and the coastal upwelling regime in spring 2007. Mesoscale eddies may doubly influence the E. mucronata population dynamic by retaining krill within them and, by advection from coastal to oligotrophic regions.

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Mesozooplankton biomass and grazing responses to Cyclone Opal, a subtropical mesoscale eddy

Cited by 64 publications

References 55 publications

Regional and temporal variability of sinking organic matter in the subtropical northeast Atlantic Ocean: a biomarker diagnosis

Regional and temporal variability of sinking organic matter in the subtropical northeast Atlantic Ocean: a biomarker diagnosis

Mesoscale physical–biological–biogeochemical linkages in the open ocean: An introduction to the results of the E-Flux and EDDIES programs

Mesoscale variability in the habitat of the Humboldt Current krill, spring 2007

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