Zooplankton in the Ligurian Sea: Part II. Exploration of their physical and biological forcing functions during summer 2000

Warren, Joseph D.; Demer, David A.; McGehee, Duncan E.; Mento, Rossella Di; Borsani, J. Fabrizio

doi:10.1093/plankt/fbh129

Cited by 12 publications

(10 citation statements)

References 14 publications

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“…In the Ligurian Sea the presence of a permanent cyclonic circulation with an associated divergence in the centre of the basin is an important feature influencing the productivity and the distribution of the species in this area at different seasons (Pinca & Dallot, 1995McGehee et al, 2004;Warren et al, 2004).…”

Section: Horizontal Distribution In Epipelagic Waters Of the Ligurianmentioning

confidence: 99%

Basin scale distribution of zooplankton in the Ligurian Sea (north-western Mediterranean) in late autumn

Licandro

Icardi²

2008

Hydrobiologia

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Mesozooplankton biomass and abundance were evaluated in epipelagic waters at 59 stations covering the Italian sector of the Ligurian Sea (northwestern Mediterranean) in December 1990. This region is characterised by a cyclonic circulation which encloses a central divergence zone and is associated with a main thermohaline front offshore the western Ligurian coast. At the end of autumn, mesozooplankton biomass (range: 0.80-4.24 mg DW m -3 ) and the abundance (range: 83.8-932 ind. m -3 ) were lower in the divergence zone. On the contrary, in the Ligurian frontal zone at the periphery of the divergence and on the eastern continental shelf the greatest values of biomass and abundance were recorded. Copepods and appendicularians dominated the mesozooplankton community, the main taxa being the copepods Clausocalanus spp. (46% of total zooplankton) and Oithona spp. (15%) and the appendicularian Fritillaria spp.(12%). Three hydrological sub-regions, i.e. the divergence, the eastern continental shelf and the periphery of the divergence, were characterised by different zooplankton communities and characteristic species. Environmental differences between the three zones were mainly related to changes in bottom topography, sea surface temperatures and quantity of particulate organic matter. Vertical mesozooplankton abundance and taxa distribution from the surface to 1,900 m depth were also examined in one station. The results showed that the bulk of the community was concentrated in the upper 200 m, small copepods being dominant particularly in the upper 50 m. The copepod community was more diversified in sub-superficial waters, with a maximum observed in the 200-400 m layer. The distributions of main zooplankton taxa described in epipelagic waters in the eastern Ligurian Sea in autumn were compared with their distribution at surface in the north-western Mediterranean obtained by sampling performed with the Continuous Plankton Recorder in 1997-1999. The analysis of the zooplankton community in CPR samples confirms the dominance of small copepods (Paracalanus spp., Clausocalanus spp., Oithona spp.) and appendicularians in the northwestern Mediterranean in late autumn-winter and shows that their distribution is mainly related to the main mesoscale hydrographic features characterising this basin.

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Section: Horizontal Distribution In Epipelagic Waters Of the Ligurianmentioning

confidence: 99%

Basin scale distribution of zooplankton in the Ligurian Sea (north-western Mediterranean) in late autumn

Licandro

Icardi²

2008

Hydrobiologia

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“…In zooplankton DVM studies, two important assumptions are usually made: vertical velocity detected by an ADCP is principally due to zooplankton motion under general oceanic conditions with negligible upwelling and downwelling phenomena (Heywood, 1996), as is the case in the Corsica Channel (e.g. Bakun and Agostini, 2001), and sound backscatter is due, in most cases, to zooplanktonic biomass (Wormuth et al, 2000). Sound backscattering is influenced by organism shape, orientation (Chu et al, 1992) and consistency; e.g.…”

Section: Introductionmentioning

confidence: 99%

“…To better interpret the ADCP data it is essential to know which organisms are common in the zooplanktonic community of the Tyrrhenian Sea and the Ligurian Sea (Andersen et al, 1998;Pinca and Dallot, 1995;Sardou et al, 1996;Warren et al, 2004;McGehee et al, 2004). According to previous studies (e.g.…”

Section: Introductionmentioning

confidence: 99%

Zooplankton diel vertical migration in the Corsica Channel (north-western Mediterranean Sea) detected by a moored acoustic Doppler current profiler

et al. 2019

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Abstract. Diel vertical migration (DVM) is a survival strategy adopted by zooplankton that we investigated in the Corsica Channel using acoustic Doppler current profiler (ADCP) data from April 2014 to November 2016. The principal aim of the study is to characterize migration patterns and biomass temporal evolution of zooplankton along the water column. The ADCP measured vertical velocity and echo intensity in the water column range between about 70 and 390 m (the bottom depth is 443 m). During the investigated period, zooplanktonic biomass had a well-defined daily and seasonal cycle, with peaks occurring in late winter to spring (2015 and 2016) when the stratification of the water column is weaker. Zooplanktonic biomass temporal distribution in the whole water column is well correlated with biomass of primary producers, estimated with satellite data. Zooplanktonic blooming and non-blooming periods have been identified and studied separately. During the non-blooming period zooplanktonic biomass was most abundant in the upper and the deep layers, while during the blooming period the upper-layer maximum in zooplanktonic biomass disappeared and the deep layer with high zooplanktonic biomass became thicker. These two layers are likely to correspond to two different zooplanktonic communities. The evolution of zooplanktonic biomass is well correlated with chlorophyll, with phytoplankton biomass peaks preceding the upper-layer secondary production by a lag of about 3.5 weeks. Nocturnal DVM appears to be the main pattern during both periods, but reverse and twilight migration are also detected. Nocturnal DVM was more evident at mid-water than in the deep and the upper layers. DVM occurred with different intensities during blooming and non-blooming periods. One of the main outcomes is that the principal drivers for DVM are light intensity and stratification, but other factors, like the moon cycle and primary production, are also taken in consideration.

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“…The resulting upwelled subsurface cold water fertilized surface waters, which increased Chl-a concentration (Fig. 1, 2 and 6) and the primary production (Sournia et al, 1990) that, in turn sustain higher trophic levels (Warren et al, 2004). 15 Furthermore, surface warm boundaries waters were sub-divided in two distinct types (Table 1): type 1 (in red in Fig.…”

Section: Physical Origins and Dynamics Of The Fine-scale Structure Inmentioning

confidence: 99%

Coupling physics and biogeochemistry thanks to high resolution observations of the phytoplankton community structure in the North-Western Mediterranean Sea

Marrec¹,

Doglioli²,

Grégori³

et al. 2017

Preprint

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Abstract. Fine-scale physical structures and ocean dynamics strongly influence and regulate biogeochemical and ecological processes. These processes are particularly challenging to describe and understand because of their ephemeral nature. The OSCAHR (Observing Submesoscale Coupling At High Resolution) campaign has been conducted in fall 2015 in which, a fine-scale structure in the North Western Mediterranean Ligurian subbasin 15 was pre-identified using both satellite and numerical modeling data. Along the ship track, various variables were measured at the surface (temperature, salinity, chlorophyll-a and nutrients concentrations) with ADCP current velocity. We also deployed a new model of CytoSense automated flow cytometer (AFCM) optimized for small and dim cells, for near real-time characterization of surface phytoplankton community structure of surface waters with a spatial resolution of few km and a hourly temporal resolution. For the first time with this type of AFCM 20 we were able to resolve Prochlorococcus and Synechococcus picocyanobacteria. The vertical physical dynamics and biogeochemical properties of the studied area were investigated by continuous high resolution CTD profiles thanks to a moving vessel profiler (MVP) during the vessel underway associated to a 1-m vertical resolution pumping system deployed during fixed stations. The observed fine-scale feature presented a cyclonic structure with a relatively cold core surrounded by warmer waters. Surface waters were totally depleted in nitrate and 25 phosphate. In addition to the doming of the isopycnals by the cyclonic circulation, an intense wind event inducedEkman pumping. The upwelled subsurface cold nutrient-rich water fertilized surface waters, characterized by an increase in Chl-a concentration. Prochlorococcus, pico-and nano-eukaryotes were more abundant in cold core waters while Synechococcus dominated in warm boundary waters. Nanoeukaryote were the main contributors

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Zooplankton in the Ligurian Sea: Part II. Exploration of their physical and biological forcing functions during summer 2000

Cited by 12 publications

References 14 publications

Basin scale distribution of zooplankton in the Ligurian Sea (north-western Mediterranean) in late autumn

Basin scale distribution of zooplankton in the Ligurian Sea (north-western Mediterranean) in late autumn

Zooplankton diel vertical migration in the Corsica Channel (north-western Mediterranean Sea) detected by a moored acoustic Doppler current profiler

Coupling physics and biogeochemistry thanks to high resolution observations of the phytoplankton community structure in the North-Western Mediterranean Sea

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