Nutrients and primary production in permanently well-mixed temperate coastal waters

Wafar, M.V.M.; Corre, Pierre Le; Birrien, Jean‐Louis

doi:10.1016/0272-7714(83)90128-2

Cited by 88 publications

(44 citation statements)

References 16 publications

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“…External variables: We used pelagic data obtained by Wafar (1981), Wafar et al (1983) and Sournia et al (1987) at Stations 'Bloscon' and 'Astan' located about 4 nautical miles from Pierre Noire in the western part of the Bay of Morlaix where the minimum depth is 25 m.…”

Section: Methodsmentioning

confidence: 99%

Carbon flows in a subtidal fine sand community from the western English Channel: a simulation analysis

Chardy¹,

Dauvin²

1992

Mar. Ecol. Prog. Ser.

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ABSTRACT. Organic carbon flows through the Plerre Noire fine sand community (Bay of Morlalx, France) are described with a trophodynamic point model. Data collected during several annual cycles are used to calibrate the seasonal vanations of each benthic compartment. Mean annual values of state vanables are correctly simulated. In a first approach, the seasonal variations were simulated using 2 forcing functions: input of energy and temperature Influence. In a second run, spawning and recruitment effects were introduced as regulating factors for the macrobenthic compartments. The result~ng annual carbon budget synthesizes the information w e have on this common type of ecosystem. Phytoplankton production represents the major food supply to the benthlc system a n d the importance of pelagic-benthlc coupllng in this area is confirmed. A large proportion of the carbon input IS consumed by bacteria which is the main trophic source for meiofauna. Melofauna is a n important llnk between the bacteria + detritus and the carnivore level, and cannot be considered as an Independent food web The significance of regulation factors such as spawning and recruitment processes in the dynamics of the macrofauna IS explored.

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Section: Methodsmentioning

confidence: 99%

Carbon flows in a subtidal fine sand community from the western English Channel: a simulation analysis

Chardy¹,

Dauvin²

1992

Mar. Ecol. Prog. Ser.

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“…High nutrient concentrations in the water column in winter as a result of remineralisation processes are typical for temperate coastal waters (Wafar et al 1983). This could be an explanation for the positive correlation between nutrient concentration and abundance of Paralia sulcata.…”

Section: Influence Of Environmental Parameters Onmentioning

confidence: 99%

“…The highest silicate concentrations in the present study were measured in winter and spring, after which the concentration decreased to half of those measured until autumn. In the spring bloom, silicate concentrations decrease rapidly due to the fast-growing spring bloom phytoplankton species which utilize the silicate very quickly (Wafar et al 1983). …”

Section: Influence Of Environmental Parameters Onmentioning

confidence: 99%

Influence of nutrients, temperature, light and salinity on the occurrence of Paralia sulcata at Helgoland Roads, North Sea

Gebühr¹,

Wiltshire²,

Aberle³

et al. 2009

Aquat. Biol.

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Paralia sulcata is a tychopelagic centric diatom species common in the North Sea. Due to the fact that P. sulcata is found both in the sediment and the water column, it is assumed to be an important food source for both benthic and pelagic grazers. We know a little about the environmental conditions associated with the occurrence of P. sulcata, but almost nothing is known of its ecological role. Thus the aim of this study was to investigate the ecology of P. sulcata. The Helgoland Roads long-term data set (North Sea), in which phytoplankton and physicochemical parameters have been sampled since 1962, served as the environmental data set. To detect possible species-environment relationships, multivariate statistical analysis was carried out (canonical correspondence analysis). Annual niche breadth and niche position (outlying mean indices) were calculated for P. sulcata. Up to 1996, P. sulcata occurred mainly in late autumn and winter, but since 1997 it has been found throughout the year. The niche position and niche breadth for P. sulcata varied over the sampling period. There was a change in the ecological niche of P. sulcata, with a shift from a more specialized to a more generalized niche and a new occurrence of this diatom in summer during the last 10 yr. Changing temperature, light and nutrient conditions at Helgoland Roads could be responsible for the new occurrence and the shift in the ecological niche of P. sulcata.

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“…and Odontella regia (Grall 1972a, b, Martin-Jézéquel 1983, Gaillard et al 2002 see Table 1). The increases of chl a observed during spring/summer at Roscoff (Waffar et al 1983, Sournia & Birrien 1995, Laabir et al 1998, P. Morin unpubl. data) were mainly due to the same diatoms as those that have occurred for decades and matched the species composition observed in the NDA diets in 2003 and 2004 (Table 1).…”

mentioning

confidence: 99%

Influence of diatoms on copepod reproduction. I. Field and laboratory observations related to Calanus helgolandicus egg production

Poulet¹,

Wichard²,

Ledoux³

et al. 2006

Mar. Ecol. Prog. Ser.

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Egg production rates (EPR) by Calanus helgolandicus females were investigated with specimens sampled weekly, from April to November 2003 and from March to October 2004, at a station located in the English Channel off Roscoff. Comparison of results between 1994Comparison of results between , 2003Comparison of results between and 2004 showed that C. helgolandicus was a late spawner in 1994 and became an early spawner in 2003 and 2004. In all cases high variations in EPR were observed, which could not be correlated to phytoplankton biomass, expressed as diatom, chlorophyll a, particulate carbon and nitrogen concentrations in 2003 and 2004. Neither were they correlated to food quality, expressed as C/N ratio. To explain this mismatch between EPR and food concentration, a series of mixed phytoplankton species dominated by diatoms (≥11 µm filtrate representing natural diatom assemblages: NDA) and 7 single diatom species, all occurring during blooms in the field, were assayed as diets with C. helgolandicus females. Ingestion of diatoms by females was estimated by faecal pellet production rates and complementary scanning electron microscopy examinations of diatom remains in pellets. Depending on diatom species in diets, EPR was either increased or depressed 2 to 3 d after food uptake by females had started. The EPR decrease was reversible, when diatom diets were replaced by the dinoflagellate Prorocentrum minimum. This effect was also observed when females were transferred to natural phytoplankton populations from the English coast of the Channel close to Plymouth, where food composition in the field differed compared to that off Roscoff. EPR ceased completely when the concentration of NDA diets was artificially increased, but recovered after a shift to a dinoflagellate diet. These results indicate that phytoplankton dominated by diatoms can impair C. helgolandicus egg production in the field. This effect was not related to the production of polyunsaturated aldehydes by diatoms. Limitations due to unidentified essential compounds not provided by the metabolism of diatoms, or unknown diatom-derived toxins, were probably involved. KEY WORDS: Copepod · Diatom · Egg production · English Channel Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 308: [129][130][131][132][133][134][135][136][137][138][139][140][141][142] 2006 the hatching success and larval development of copepods, mediated by deleterious polyunsaturated aldehydes (Miralto et al. 1999, Pohnert et al. 2002, Adolph et al. 2004, Ianora et al. 2004), but egg production can also vary significantly depending on diet. Patterns of variability in egg production conform to changes in dinoflagellate and microzooplankton biomass (Kleppel et al. 1991), as well as to phytoplankton blooms mostly dominated by diatoms (Runge & Plourde 1996, Meyer-Harms et al. 1999). The varying influence of different algae on these stages of ontogenesis has been documented by several laboratory studies (Ban et al. 1997, Pohnert et ...

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Nutrients and primary production in permanently well-mixed temperate coastal waters

Cited by 88 publications

References 16 publications

Carbon flows in a subtidal fine sand community from the western English Channel: a simulation analysis

Carbon flows in a subtidal fine sand community from the western English Channel: a simulation analysis

Influence of nutrients, temperature, light and salinity on the occurrence of Paralia sulcata at Helgoland Roads, North Sea

Influence of diatoms on copepod reproduction. I. Field and laboratory observations related to Calanus helgolandicus egg production

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