Mesoscale structure of copepod assemblages in the coastal transition zone and oceanic waters off central-southern Chile

Morales, Carmen E.; Torreblanca, Marcela; Hormazábal, Samuel; Correa-Ramírez, Marco; Núñez, Sergio; Hidalgo, Pamela

doi:10.1016/j.pocean.2009.12.001

Cited by 52 publications

(48 citation statements)

References 54 publications

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“…Variations in the zooplankton distribution pattern in the mesoscale eddies depends on many factors like (Owen 1981;BenitezNelson and McGillicuddy 2008;Morales et al 2010). In our study, the variations of chl.…”

Section: Resultsmentioning

confidence: 49%

Response of micro- and mesozooplankton in the southwestern Bay of Bengal to a cyclonic eddy during the winter monsoon, 2005

Jayalakshmi

Sabu

Devi

et al. 2015

Environ Monit Assess

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A cyclonic eddy (CE) in the southwestern Bay of Bengal (SWBoB; 10-15° N; 81-87° E) during winter monsoon 2005 and associated changes in the open ocean hydrography and productivity patterns were studied using satellite observations and in situ measurements. Analysis of the satellite-derived sea surface height anomaly (SSHA) indicated the existence of a large eddy (10-15° N; 81-87° E) from November to January, with its core centered at 13° N and 82° E. The large positive wind stress curl (~1.8 × 10(-7) N m(-2)) and resultant Ekman pumping (~3 × 10(-2) cm s(-1)) were identified as the prominent forcing mechanisms. In addition, the cyclonic storms and depressions experienced in the region during the study period seem to have served to maintain the strength of the CE through associated Ekman pumping. The cold (~26.6 °C), nutrient-enriched (NO3 > 2 μM, PO4 > 0.73 μM and SiO4 > 3 μM) upwelled waters in the upper layers of the CE enhanced the biological production (chl. a > 0.56 mg m(-3)). Dissolved oxygen in the surface waters was > 200 μM. The phytoplankton and zooplankton biomass recorded during the season was comparable or perhaps higher than the peak values reported from the northeastern Arabian Sea (chlorophyll a concentrations of 0.2 to 0.4 mg m(-3) and zooplankton biovolume 0.6 ml m(-3)) during winter. Occurrence of a higher mesozooplankton biovolume (0.8 ml m(-3)) and relatively low abundance of microzooplankton indicates the prevalence of a short food chain. In conclusion, high biological production, both at primary as well as secondary level, suggests the prevalence of an efficient food web as a result of physical forcing and subsequent ecological interactions evident up to tertiary level in an oligotrophic basin like BoB.

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Section: Resultsmentioning

confidence: 49%

Response of micro- and mesozooplankton in the southwestern Bay of Bengal to a cyclonic eddy during the winter monsoon, 2005

Jayalakshmi

Sabu

Devi

et al. 2015

Environ Monit Assess

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“…Mesozooplankton assemblages in the coastal transition zone had been extensively studied (e.g. Morales et al, 2010;Zhang et al, 2009). However, to our knowledge, there was no study about tintinnid assemblage transition and interaction between coastal area and oceanic area.…”

Section: Introductionmentioning

confidence: 99%

Interaction between neritic and warm water tintinnids in surface waters of East China Sea

Zhao

Chen

et al. 2016

Deep Sea Research Part II: Topical Studies in Oceanography

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“…In the eastern South Pacific (ESP) Ocean, mesoscale eddies frequently form in the coastal transition zone off central Chile due to the instability of the alongshore currents (Hormazábal et al, 2013;Morales et al, 2010Morales et al, , 2012. These eddies transport water for long distances and over several months across biogeographic boundaries, from the productive Humboldt (Peru-Chile) Current to adjacent oligotrophic waters of the subtropical gyre (Pizarro et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Biogeochemical characteristics of a long-lived anticyclonic eddy in the eastern South Pacific Ocean

D'Ottone¹,

Bravo

Ramos

et al. 2016

Biogeosciences

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Abstract. Mesoscale eddies are important, frequent, and persistent features of the circulation in the eastern South Pacific (ESP) Ocean, transporting physical, chemical and biological properties from the productive shelves to the open ocean. Some of these eddies exhibit subsurface hypoxic or suboxic conditions and may serve as important hotspots for nitrogen loss, but little is known about oxygen consumption rates and nitrogen transformation processes associated with these eddies. In the austral fall of 2011, during the Tara Oceans expedition, an intrathermocline, anticyclonic, mesoscale eddy with a suboxic (< 2 µmol kg −1 of O 2 ), subsurface layer (200-400 m) was detected ∼ 900 km off the Chilean shore (30 • S, 81 • W). The core of the eddy's suboxic layer had a temperature-salinity signature characteristic of Equatorial Subsurface Water (ESSW) that at this latitude is normally restricted to an area near the coast. Measurements of nitrogen species within the eddy revealed undersaturation (below 44 %) of nitrous oxide (N 2 O) and nitrite accumulation (> 0.5 µM), suggesting that active denitrification occurred in this water mass. Using satellite altimetry, we were able to track the eddy back to its region of formation on the coast of central Chile (36.1 • S, 74.6 • W). Field studies conducted in Chilean shelf waters close to the time of eddy formation provided estimates of initial O 2 and N 2 O concentrations of the ESSW source water in the eddy. By the time of its offshore sighting, concentrations of both O 2 and N 2 O in the subsurface oxygen minimum zone (OMZ) of the eddy were lower than concentrations in surrounding water and "source water" on the shelf, indicating that these chemical species were consumed as the eddy moved offshore. Estimates of apparent oxygen utilization rates at the OMZ of the eddy ranged from 0.

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Mesoscale structure of copepod assemblages in the coastal transition zone and oceanic waters off central-southern Chile

Cited by 52 publications

References 54 publications

Response of micro- and mesozooplankton in the southwestern Bay of Bengal to a cyclonic eddy during the winter monsoon, 2005

Response of micro- and mesozooplankton in the southwestern Bay of Bengal to a cyclonic eddy during the winter monsoon, 2005

Interaction between neritic and warm water tintinnids in surface waters of East China Sea

Biogeochemical characteristics of a long-lived anticyclonic eddy in the eastern South Pacific Ocean

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