Daily and seasonal variations in the spatial distribution of zooplankton populations in relation to the physical structure in the Ligurian Sea Front

Boucher, Jean; Ibañez, Frédéric; Prieur, Louis

doi:10.1357/002224087788400891

Cited by 155 publications

(91 citation statements)

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“…The present observations of layers of fluorescence coincident with the subducted MSW suggest that at least some phytoplankton were drawn down and along the isopycnals. Boucher et al (1987), Dewey et al (1991) and Hood et al (1991) made similar observations of downward and oblique transport of phytoplankton along isopycnals.…”

Section: Discussionmentioning

confidence: 55%

Mesoscale subduction at the Almeria–Oran front

Fielding

Crisp

Allen

et al. 2001

Journal of Marine Systems

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Section: Discussionmentioning

confidence: 55%

Mesoscale subduction at the Almeria–Oran front

Fielding

Crisp

Allen

et al. 2001

Journal of Marine Systems

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“…These cause patchy distributions of phytoplankton (Rodriguez et al 2001;Martin 2003) and zooplankton (Boucher et al 1987;Abraham 1998;Madin et al 2001). Moreover, upward water motions in the ageostrophic frontal circulation caused by mesoscale and submesoscale physical structures result in divergence, which may reduce the sinking of large phytoplankton through upwelling, control the size structure of phytoplankton assemblages, and favor the formation of patches in the upper layer (Rodriguez et al 2001).…”

mentioning

confidence: 99%

Vertical distribution of aggregates (>110 µm) and mesoscale activity in the northeastern Atlantic: Effects on the deep vertical export of surface carbon

Guidi

Stemmann

Legendre

et al. 2007

Limnology & Oceanography

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Spatial and temporal variability in the distribution of marine aggregates (.110 mm) was studied using underwater video profilers in an area off the Iberian Peninsula and Azores Islands dominated by mesoscale and submesocale hydrodynamics in winter, spring, and summer 2001. In the 0-200-m layer, aggregates were most abundant in spring (100-120 mg dry weight [dry wt] m 23 ) and lowest during summer and winter (1-10 mg dry wt m 23 ). In the deeper layers (down to 1,000 m), the seasonal pattern was different, with concentrations highest in spring and summer, and lowest in winter (e.g., at 800 m, 5-10 mg dry wt m 23 in spring and summer; 1-5 mg dry wt m 23 in winter). The seasonal change in the abundance of aggregates in the upper 1,000 m was consistent with changes in the composition and intensity of the particulate flux recorded in sediment traps and with seasonal changes in the surface phytoplankton community. In an area dominated by eddies, surface accumulation of aggregates and export down to 1,000 m occur at mesoscale distances (,100 km). The occurrence of a rich aggregate layer may be related to mesoscale activity in water flow that drives nutrient inputs, phytoplankton production, and the formation of large aggregates. Such spatially constrained zones of massive export may be typical of frontal open-sea systems, and may have been missed by conventional sediment trap moorings, which cannot resolve export at this mesoscale level.

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“…However, Mcgehee et al (2004), who studied the spatial distribution of copepods in the Ligurian Sea, shows that (i) this species is not totally absent from the coastal zone, (ii) in two stations of the central part of the Ligurian Sea, this species is absent in one station and present in large numbers in the other. Meanders in the frontal structure might explain the differences in the spatial position of the maximum of abundance for some copepod species (Boucher et al, 1987). For DYNAPROC 2 cruise, we suggest that M. tenuicornis found favourable conditions in the low salinity water mass and were displaced with the water displacement.…”

Section: Comparison With Previous Studiesmentioning

confidence: 77%

Short term changes in zooplankton community during the summer-autumn transition in the open NW Mediterranean Sea: species composition, abundance and diversity

et al. 2008

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Abstract. Short term changes in zooplankton community were investigated at a fixed station in offshore waters of the Ligurian Sea (DYNAPROC 2 cruise, September-October 2004). Mesozooplankton were sampled with vertical WP-II hauls (200 µm mesh-size) and large mesozooplankton, macrozooplankton and micronekton with a BIONESS multinet sampler (500 µm mesh-size). Temporal variations of total biomass, species composition and abundance of major taxa were studied. Intrusions of low salinity water masses were observed two times during the cruise. The first one, which was the most intense, was associated with changes in zooplankton community composition. Among copepods, the abundance of Calocalanus, Euchaeta, Heterorhabdus, Mesocalanus, Nannocalanus, Neocalanus, Pleuromamma and also calanoid copepodites increased markedly. Among noncopepod taxa, only small ostracods abundance increased. After this low salinity event, abundance of all taxa nearly returned to their initial values. The influence of salinity on each zooplankton taxon was confirmed by a statistical analysis (Perry's method). The Shannon diversity index, Pielou evenness and species richness were used to describe temporal variations of large copepod (>500 µm) diversity. The Shannon index and Pielou evenness decreased at the beginning of the low salinity water intrusions, but not species richness. We suggest that low salinity water masses contained its own zooplankton community and passed through the sampling area, thus causing a replacement of the zooplankton population.

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Daily and seasonal variations in the spatial distribution of zooplankton populations in relation to the physical structure in the Ligurian Sea Front

Cited by 155 publications

References 0 publications

Mesoscale subduction at the Almeria–Oran front

Mesoscale subduction at the Almeria–Oran front

Vertical distribution of aggregates (>110 µm) and mesoscale activity in the northeastern Atlantic: Effects on the deep vertical export of surface carbon

Short term changes in zooplankton community during the summer-autumn transition in the open NW Mediterranean Sea: species composition, abundance and diversity

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