Conditions de formation d'eaux colorées toxiques sur le plateau continental Manche - Atlantique; Cas de Gyrodinium cf. aureolum

Corre, Pierre Le; L’Helguen, Stéphane; Morin, Pascal; Birrien, Jean‐Louis

doi:10.1051/hydro:1992214

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…The vertical distribution of food resources may also influence the vertical distribution of planktotrophic larvae including echinoderms [49][50][51] . In the bay of Douarnenez, previous observations 52, 53 and our data indicated that the maximum chlorophyll-a concentration in July is at the depth of or below the pycnocline (Fig. 1g) which could be a causal factor in the downward migration of O. nigra larvae during daytime.…”

Section: Discussionsupporting

confidence: 71%

“…In response to weak semi-diurnal tidal currents with a velocity ranging between 0.1 and 1 m s −1 , a shallow thermal stratification located at about 10-15 m occurs during summer, from June to September, in its central area 53,67 . During this period of time, a maximum of chlorophyll-a concentration is found at the depth of or below the thermocline 52,53 . Concomitant with stratification, a coastal front appears at the entrance of the bay and separates the stratified waters of the bay and the well-mixed and colder offshore waters.…”

Section: Discussionmentioning

confidence: 99%

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Vertical distribution of brittle star larvae in two contrasting coastal embayments: implications for larval transport

Guillam

Bessin

Blanchet-Aurigny

et al. 2020

Sci Rep

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the ability of marine invertebrate larvae to control their vertical position shapes their dispersal pattern. in species characterized by large variations in population density, like many echinoderm species, larval dispersal may contribute to outbreak and die-off phenomena. A proliferation of the ophiuroid Ophiocomina nigra was observed for several years in western Brittany (france), inducing drastic changes on the benthic communities. We here studied the larval vertical distribution in this species and two co-occurring ophiuroid species, Ophiothrix fragilis and Amphiura filiformis, in two contrasting hydrodynamic environments: stratified in the bay of Douarnenez and well-mixed in the bay of Brest. Larvae were collected at 3 depths during 25 h within each bay. In the bay of Brest, all larvae were evenly distributed in the water column due to the intense vertical mixing. Conversely, in the bay of Douarnenez, a diel vertical migration was observed for O. nigra, with a night ascent of young larvae, and ontogenetic differences. These different patterns in the two bays mediate the effects of tidal currents on larval fluxes. O. fragilis larvae were mainly distributed above the thermocline which may favour larval retention within the bay, while A. filiformis larvae, mostly concentrated near the bottom, were preferentially exported. This study highlighted the complex interactions between coastal hydrodynamics and specific larval traits, e.g. larval morphology, in the control of larval vertical distribution and larval dispersal.

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Section: Discussionsupporting

confidence: 71%

Section: Discussionmentioning

confidence: 99%

Vertical distribution of brittle star larvae in two contrasting coastal embayments: implications for larval transport

Guillam

Bessin

Blanchet-Aurigny

et al. 2020

Sci Rep

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“…A number of emergency studies have been made following a fish-kill or the appearance of discoloured water. The majority of these have been concerned with blooms of the naked dinoflagellate, Gyrodinium aureolum, which seem to have occurred with increased frequency in recent years (Corre et al, 1992;Jones et al, 1982;Ottway et al, 1979;Pybus, 1980). So far this organism has not been encountered in the northern Scottish sea lochs or during the present study, although it does occur in high numbers in the frontal areas of the Orkney-Shetland Channel (Pingree et al, 1978) and also in the Atlantic off the north-west of Scotland (Holligan et al, 1980).…”

Section: Discussionmentioning

confidence: 54%

A Seasonal Analysis of the Armoured Dinoflagellates of Loch Eriboll, North Scotland

Dodge

1995

J. Mar. Biol. Ass.

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The armoured planktonic dinoflagellates present at a site adjacent to a floating fish-farm in Loch Eriboll, North Scotland, were studied by surface net-sampling, mainly at two-weekly intervals, over a period of four years 1990–1993. A total of 62 species was recorded. Some dinoflagellates were present at all times of the year but they reached their lowest numbers in May, during the spring diatom bloom, and their highest numbers in mid-summer. There was usually a seasonal pattern in which the most abundant dinoflagellate during the early summer was the heterotrophic species Protoperidinium ovatum, and this was followed in the later summer by the autotroph Ceratium fusus. In 1993 the pattern was rather different, with Gonyaulax species abundant in June and, later in the year, both Protoperidinium cerasus and P. excentricum having periods of abundance. Potential toxin-producing dinoflagellates, Alexandrium tamarense (PSP) and Dinophysis acuminata (DSP), were found in small numbers.

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Distribution and dynamics of two species of Dinophyceae producing high biomass blooms over the French Atlantic Shelf

et al. 2016

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Conditions de formation d'eaux colorées toxiques sur le plateau continental Manche - Atlantique; Cas de Gyrodinium cf. aureolum

Cited by 3 publications

References 13 publications

Vertical distribution of brittle star larvae in two contrasting coastal embayments: implications for larval transport

Vertical distribution of brittle star larvae in two contrasting coastal embayments: implications for larval transport

A Seasonal Analysis of the Armoured Dinoflagellates of Loch Eriboll, North Scotland

Distribution and dynamics of two species of Dinophyceae producing high biomass blooms over the French Atlantic Shelf

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