Diel vertical migration of zooplankton at the <scp>S</scp>1 biogeochemical mooring revealed from acoustic backscattering strength

Inoue, Ryuichiro; Kitamura, Minoru; Fujiki, Tetsuichi

doi:10.1002/2015jc011352

Cited by 13 publications

(10 citation statements)

References 36 publications

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“…Most of the available observations concern mesozooplankton and/or micronekton, such that in the database, only very few data points refer to the whole community. References from which the database is derived are as follows: Rodier and Le Borgne (); Yamaguchi et al (); Smeti et al (); Haury et al (); Cook et al (); Head et al (); Allison and Wishner (); Madhupratap et al (); Décima et al (); Yebra et al (); Putzeys et al (); Roman et al (); Le Borgne et al (); Martin and Christiansen (); Décima et al (); Hays, Harris, et al (); Hernández‐León et al (); Steinberg, Cope, et al (); Dam et al (); Champalbert et al (); Champalbert et al (); Kitamura et al (); Landry et al (); Hidaka et al (); Madin et al (); Timonin (); Pal et al (); Marlowe and Miller (); Smith et al (); Perissinotto and McQuaid (); Inoue et al (); Hopkins (); Ward et al (). The database includes 96 data points.…”

Section: Methodsmentioning

confidence: 99%

Evaluating the Potential Impacts of the Diurnal Vertical Migration by Marine Organisms on Marine Biogeochemistry

Aumont

Maury

Lefort

et al. 2018

Global Biogeochemical Cycles

115

107

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Diurnal vertical migration (DVM) of marine organisms is an ubiquitous phenomenon in the ocean that generates an active vertical transport of organic matter. However, the magnitude and consequences of this flux are largely unknown and are currently overlooked in ocean biogeochemical models. Here we present a global model of pelagic ecosystems based on the ocean biogeochemical model NEMO‐PISCES that is fully coupled to the upper trophic levels model Apex Predators ECOSystem Model, which includes an explicit description of migrating organisms. Evaluation of the model behavior proved to be challenging due to the scarcity of suitable observations. Nevertheless, the model appears to be able to simulate approximately both the migration depth and the relative biomass of migrating organisms. About one third of the epipelagic biomass is predicted to perform DVM. The flux of carbon driven by DVM is estimated to be 1.05 ± 0.15 PgC/year, about 18% of the passive flux of carbon due to sinking particles at 150 m. Comparison with local studies suggests that the model captures the correct magnitude of this flux. Oxygen is decreased in the mesopelagic domain by about 5 mmol m−3 relative to simulations of an ocean without DVM. Our study concludes that DVM drives a significant and very efficient flux of carbon to the mesopelagic domain, similar in magnitude to the transport of DOC. Relative to a model run without DVM, the consequences of this flux seem to be quite modest on oxygen, due to compensating effects between DVM and passive fluxes.

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Section: Methodsmentioning

confidence: 99%

Evaluating the Potential Impacts of the Diurnal Vertical Migration by Marine Organisms on Marine Biogeochemistry

Aumont

Maury

Lefort

et al. 2018

Global Biogeochemical Cycles

115

107

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“…The zooplankton biomass concentration can be well revealed from acoustic backscatter strength S v (dB; Bianchi et al, 2013;Inoue et al, 2016). The backscatter strength can be derived from the echo intensity E (count) of the VADCP using…”

Section: Acoustic Backscatter Strengthmentioning

confidence: 99%

Subsurface Cyclonic Eddies Observed in the Southeastern Tropical Indian Ocean

et al. 2019

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In this study, we for the first time observed two subsurface cyclonic eddies (SCEs) in the southeastern Tropical Indian Ocean. One SCE (SCE‐C) was observed along 8°S transect during the cruise conducted in July 2016. Another SCE (SCE‐A) was also observed near 8°S but by an Argo float in November 2005. The SCE‐C had a maximum thickness of about 500 m (300–800 m) and a radius of ~90 km, while the SCE‐A has a vertical extent of 700 m (200–900 m) and a radius larger than 110 km. The water trapped by SCE shows a three‐compartment structure. Both the two SCEs are characterized by stratified water with negative lens structure and cause prominent temperature/salinity/spiciness anomalies in a wide density range. As the water carried by SCEs is stratified, we can trace the SCE origin by finding an area sharing the same water property with the SCE on different density surfaces. The result suggests that the two SCEs originate from the southwest coast of the Sumatra Island. Considering the topography and hydrologic characteristics of the SCE origin, we speculate that the SCEs are generated due to topography‐induced South Java Undercurrent instability.

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“…Net tows do not, however, allow estimation of zooplankton concentration within the migrating layer and during the DVM with adequate time and vertical resolution. The VBS can be used to provide suitably resolved data on zooplankton concentration and size (Sutor et al, 2005;Record & de Young, 2006;Hembre & Megard, 2003;Huber et al, 2011;Barth et al, 2014;Inoue et al, 2016) and was available during the DVM. For each migration dates, the VBS was depth-averaged within the zooplankton layer to provide the mean zooplankton concentration during the vertical ascent (Fig.…”

Section: Zooplankton Concentrationmentioning

confidence: 99%

Effect of temperature on zooplankton vertical migration velocity

2018

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Zooplankton diel vertical migration (DVM) is an ecologically important process, affecting nutrient transport and trophic interactions. Available measurements of zooplankton displacement velocity during the DVM in the field are rare; therefore, it is not known which factors are key in driving this velocity. We measured the velocity of the migrating layer at sunset (upward bulk velocity) and sunrise (downwards velocity) in summer 2015 and 2016 in a lake using the backscatter strength (VBS) from an acoustic Doppler current profiler. We collected time series of temperature, relative change in light intensity chlorophylla concentration and zooplankton concentration. Our data show that upward velocities increased during the summer and were not enhanced by food, light intensity or by VBS, which is a proxy for zooplankton concentration and size. Upward velocities were strongly correlated with the water temperature in the migrating layer, suggesting that temperature could be a key factor controlling swimming activity. Downward velocities were constant, likely because Daphnia passively sink at sunrise, as suggested by our model of Daphnia sinking rate. Zooplankton migrations mediate trophic interactions and web food structure in pelagic ecosystems. An understanding of the potential environmental determinants of this behaviour is therefore essential to our knowledge of ecosystem functioning.

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Diel vertical migration of zooplankton at the S1 biogeochemical mooring revealed from acoustic backscattering strength

Cited by 13 publications

References 36 publications

Evaluating the Potential Impacts of the Diurnal Vertical Migration by Marine Organisms on Marine Biogeochemistry

Evaluating the Potential Impacts of the Diurnal Vertical Migration by Marine Organisms on Marine Biogeochemistry

Subsurface Cyclonic Eddies Observed in the Southeastern Tropical Indian Ocean

Effect of temperature on zooplankton vertical migration velocity

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