Monthly HPLC measurements of pigment concentration from an intertidal muddy sediment of Marennes-Oléron Bay, France

Gall, V. Cariou-Le; Blanchard, G.F.

doi:10.3354/meps121171

Cited by 85 publications

(19 citation statements)

References 31 publications

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“…High epipelic chl a concentrations here and in other Arctic Foothill lakes relate at least in part to sampling methodology, as the 2 cm sediment sample depth in Arctic Foothill studies by Whalen et al (2006) and Gettel et al (2007) exceeds the B1 cm common to many prior reports. Viable pigments and live algae have frequently been reported to several cm below the sediment surface (Stanley, 1976;Cariou-LeGall & Blanchard, 1995), including sediments below the zone of active photosynthesis (SandJensen & Borum, 1991). Thus, variability among studies in the depth of sediment sampled renders difficult both cross-site comparisons of epipelic chl a values and correlation of photosynthetic rates to pigment concentrations.…”

Section: Discussionmentioning

confidence: 98%

Epipelic and pelagic primary production in Alaskan Arctic lakes of varying depth

2008

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We compared on eight dates during the icefree period physicochemical properties and rates of phytoplankton and epipelic primary production in six arctic lakes dominated by soft bottom substrate. Lakes were classified as shallow (z \ 2.5 m), intermediate in depth (2.5 m \ z \ 4.5 m), and deep (z [ 4.5 m), with each depth category represented by two lakes. Although shallow lakes circulated freely and intermediate and deep lakes stratified thermally for the entire summer, dissolved oxygen concentrations were always [70% of saturation values. Soluble reactive phosphorus and dissolved inorganic nitrogen (DIN = NO 3 --N + NH 4 + -N) were consistently below the detection limit (0.05 lmol l -1 ) in five lakes. However, one lake shallow lake (GTH 99) periodically showed elevated values of DIN (17 lmol l -1 ), total-P (0.29 lmol l -1 ), and total-N (33 lmol l -1 ), suggesting wind-generated sediment resuspension. Due to increased nutrient availability or entrainment of microphytobenthos, GTH 99 showed the highest average volume-based values of phytoplankton chlorophyll a (chl a) and primary production, which for the six lakes ranged from 1.0 to 2.9 lg l -1 and 0.7-3.8 lmol C l -1 day -1 .Overall, however, increased z resulted in increased area-based values of phytoplankton chl a and primary production, with mean values for the three lake classes ranging from 3.6 to 6.1 mg chl a m -2 and 3.2-5.8 mmol C m -2 day -1 . Average values of epipelic chl a ranged from 131 to 549 mg m -2 for the three depth classes, but levels were not significantly different due to high spatial variability. However, average epipelic primary production was significantly higher in shallow lakes (12.2 mmol C m -2 day -1 ) than in intermediate and deep lakes (3.4 and 2.4 mmol C m -2 day -1 ). Total primary production (6.7-15.4 mmol C m -2 day -1 ) and percent contribution of the epipelon (31-66%) were inversely related to mean depth, such that values for both variables were significantly higher in shallow lakes than in intermediate or deep lakes.

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Section: Discussionmentioning

confidence: 98%

Epipelic and pelagic primary production in Alaskan Arctic lakes of varying depth

2008

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“…In many estuaries, diatoms comprise the dominant component of the benthic microalgal community (Sullivan and Moncreiff, 1988; Stolz, 1990; Cariou-Le Gall and Blanchard, 1995; Brotas and Plante-Cuny, 1998; Buffan-Dubau and Carman, 2000; Armitage and Fong, 2004b). Diatoms are critical for stabilizing substrate and reducing erosion through the production of extracellular polymeric substances (Austen et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Decoupling of nutrient and grazer impacts on a benthic estuarine diatom assemblage

Armitage

González

Fong

2009

Estuarine, Coastal and Shelf Science

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Strong interactions between top-down (consumptive) and bottom-up (resource supply) trophic factors occur in many aquatic communities, but these forces can act independently in some microphytobenthic communities. Within benthic estuarine diatom assemblages, the dynamics of these interactions and how they vary with abiotic environmental conditions are not well understood. We conducted a field experiment at two sites with varying habitat characteristics to investigate the interactive effects of grazers and nutrients on benthic estuarine diatoms. We crossed snail (Cerithidea californica) and nutrient (nitrogen and phosphorus) addition treatments in enclosures on a restored tidal sandflat and a reference tidal mudflat in Mugu Lagoon, southern California. We repeated the study in summer 2000 and spring 2001 to assess temporal variation in the interactions. Snails caused a large decrease in diatom relative abundance and biomass (estimated as surface area); nutrients increased diatom abundance but did not alter diatom biomass. Snails and nutrients both reduced average diatom length, although the nutrient effect was weaker and temporally variable, occurring in the reference mudflat in the spring. There were few interactions between snail and nutrient addition treatments, suggesting that links between top-down and bottom-up forces on the diatom community were weak. There were no consistent differences in diatom assemblage characteristics between the two study sites, despite marked differences in sediment grain size and other abiotic characteristics between the sites. The strong diatom response to herbivores and weaker responses to enrichment differed from the previous studies where cyanobacteria increased in response to nutrient enrichment, further dissolving the “black box” perception of microphytobenthic communities.

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“…In each treatment plot at three months and six months, separate cores (0.95 cm 2 3 5 mm and 0.56 cm 2 3 5 mm, respectively) were taken for chlorophyll a (a proxy for microalgal biomass) and for analysis of algal pigments by high-performance liquid chromatography (HPLC) to indicate microalgal functional group composition and diversity (Cariou-LeGall and Blanchard 1995). Once back in the laboratory, chlorophyll a was extracted with 90% acetone and the concentration was determined spectrophotometrically (Plante-Cuny 1973).…”

Section: Algae Collection and Analysismentioning

confidence: 99%

Regulation of Benthic Algal and Animal Communities by Salt Marsh Plants: Impact of Shading

Whitcraft

Levin

2007

Ecology

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Abstract. Plant cover is a fundamental feature of many coastal marine and terrestrial systems and controls the structure of associated animal communities. Both natural and human-mediated changes in plant cover influence abiotic sediment properties and thus have cascading impacts on the biotic community. Using clipping (structural) and light (shading) manipulations in two salt marsh vegetation zones (one dominated by Spartina foliosa and one by Salicornia virginica), we tested whether these plant species exert influence on abiotic environmental factors and examined the mechanisms by which these changes regulate the biotic community. In an unshaded (plant and shade removal) treatment, marsh soils exhibited harsher physical properties, a microalgal community composition shift toward increased diatom dominance, and altered macrofaunal community composition with lower species richness, a larger proportion of insect larvae, and a smaller proportion of annelids, crustaceans, and oligochaetes compared to shaded (plant removal, shade mimic) and control treatment plots. Overall, the shaded treatment plots were similar to the controls. Plant cover removal also resulted in parallel shifts in microalgal and macrofaunal isotopic signatures of the most dynamic species. This suggests that animal responses are seen mainly among microalgae grazers and may be mediated by plant modification of microalgae. Results of these experiments demonstrate how light reduction by the vascular plant canopy can control salt marsh sediment communities in an arid climate. This research facilitates understanding of sequential consequences of changing salt marsh plant cover associated with climate or sea level change, habitat degradation, marsh restoration, or plant invasion.

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Monthly HPLC measurements of pigment concentration from an intertidal muddy sediment of Marennes-Oléron Bay, France

Cited by 85 publications

References 31 publications

Epipelic and pelagic primary production in Alaskan Arctic lakes of varying depth

Epipelic and pelagic primary production in Alaskan Arctic lakes of varying depth

Decoupling of nutrient and grazer impacts on a benthic estuarine diatom assemblage

Regulation of Benthic Algal and Animal Communities by Salt Marsh Plants: Impact of Shading

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