Changes in microphytobenthic chlorophyll a and EPS resulting from sediment compaction due to de-watering: opposing patterns in concentration and content

Perkins, Rupert; Honeywill, Claire; Consalvey, Mireille; Austin, Heather; Tolhurst, T.J.; Paterson, David M.

doi:10.1016/s0278-4343(03)00006-2

Cited by 81 publications

(64 citation statements)

References 32 publications

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“…The distribution of chl a was defined by an exponential decrease away from the surface (Perkins et al 2003), which is caused by the pronounced migration of cells to the surface during low-tide daytime exposures (Herlory et al 2004). Time-and irradiancedependent differences in the shape of the chlorophyll profile, and in the surface species composition, are known to occur, but were not considered here due to the complexity of factors that can influence migration (Consalvey et al 2004).…”

Section: Methodsmentioning

confidence: 99%

Biodiversityecosystem function relationship in microphytobenthic diatoms of the Westerschelde estuary

Forster¹,

Créach²,

Sabbe³

et al. 2006

Mar. Ecol. Prog. Ser.

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Section: Methodsmentioning

confidence: 99%

Biodiversityecosystem function relationship in microphytobenthic diatoms of the Westerschelde estuary

Forster¹,

Créach²,

Sabbe³

et al. 2006

Mar. Ecol. Prog. Ser.

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“…1b, associated with station localisation. Moreover, during the sampling period, the lower-transect station showed a high water content in sediments (Perkins et al 2003), whereas the upper-transect station was subject to greater desiccation, de-watering and temperature effects, which can be increased by a long period of emersion (Underwood & Kromkamp 1999). These factors result in a monomodal distribution of biomass across the intertidal flat, with the peak somewhere between mid-tide level and mean high water neap tide level and not necessarily at the highest bathymetric level as found by Guarini et al (1998) (Underwood & Kromkamp 1999).…”

Section: Spatial and Temporal Variability Of Microphytobenthos Pabmentioning

confidence: 98%

“…Water content decreasing from Stn I to Stn V (Table 4) showed the influence of sediment de-watering during the emersion period, between the beginning and the end of the sampling programme. It could result in changes in microphytobenthic chl a concentration due to an increase in the sediment wet bulk density (Perkins et al 2003).…”

Section: Pab Sediment Characteristics and Species Communitiesmentioning

confidence: 99%

Spatio-temporal changes in microphytobenthos structure analysed by pigment composition in a macrotidal flat (Bourgneuf Bay, France)

Méléder¹,

Barillé²,

Rincé³

et al. 2005

Mar. Ecol. Prog. Ser.

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The aim of this study was to contribute to a better understanding of turbid coastal ecosystems, focusing on spatio-temporal changes at the mesoscale in microphytobenthos structures in a macrotidal bay (Bourgneuf, France). This was based on pigment analysis by high-pressure liquid chromatography (HPLC), reinforced by microscopy observations, in relation to sediment characteristics. Microphytobenthos assemblages of this mudflat were 97% dominated by diatoms, confirmed by HPLC analysis, which showed biomarker pigments of this group: chlorophyll c, fucoxanthin, diadinoxanthin and diatoxanthin. The main assemblage is constituted of epipsammic species, like Plagiogrammopsis, Achnanthes and Cocconeis, characterising mixed sediments. However, this could be replaced by epipelic species, like Plagiotropis, Pleurosigma and Staurophora, during summer due to station silting. Microphytobenthic photosynthetic active biomass in the first 2 mm varied spatially and temporally from 12.2 to 186.9 mg chl a m -2. The predominance of a biomass spatial variability reflected spatial changes in sediment grain size and water content. Biomass in the first 2 mm represented from 28 to 68% of the total amount in the first 10 mm. This indicated an accumulation of biomass in illuminated layers and a biomass decrease with depth associated with increasing values of the ratio of phaeopigments a and fucoxanthin to chlorophyll a (phaeo a/chl a and fuco/chl a). Both could exceed 1.00 in deeper layers. Temporal changes in microphytobenthos structure at the mesoscale were mainly linked to hydrodynamism. This is stronger in winter and responsible for allochthonous pigment input (lutein and phaeophytin b) and sediment mixing, as grazing activity by macro-and meiofauna, forming chlorophyll a breakdown products, is responsible for an increase in fuco/chl a and phaeo a/chl a values during spring/summer. KEY WORDS: Microphytobenthos · Diatoms · Pigments · High-pressure liquid chromatography · HPLC · GranulometryResale or republication not permitted without written consent of the publisher

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“…In this paper, we will not elaborate on the differences between content and concentration (see e.g. Perkins et al, 2003). The difference between the two parameters is further discussed for the Tagus estuary in a paper by Cartaxana et al (2006).…”

Section: Seasonal Dynamicsmentioning

confidence: 99%

Photoacclimation in microphytobenthos and the role of xanthophyll pigments

Leeuwe¹,

Brotas

Consalvey

et al. 2008

European Journal of Phycology

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Estuarine microphytobenthos are frequently exposed to excessively high irradiances. Photoinhibition in microalgae is prevented by various photophysiological responses. We describe here the role of the xanthophyll pigments in photoacclimation. The pigment composition of the microphytobenthos was studied in three European estuaries (Barrow, Ireland; Eden, UK; Tagus, Portugal). Using HPLC-analyses, microscale changes in biomass and pigment composition were monitored over short (hourly) and long (seasonal) time scales. In the Barrow estuary, the biomass of microphytobenthos (measured as chlorophyll a) increased significantly in the top 400-500 mm of the sediment surface within 1 h of emersion; simultaneously, the xanthophyll pool size (diadinoxanthin plus diatoxanthin, dd þ dt) almost doubled. A more gradual conversion of dd into dt was observed, with the dt:dd ratio increasing from <0.1 at the start of emersion to >0.3 after 3 h emersion. Similar trends in the dt:dd ratio were observed in the surface sediments of the Eden and the Tagus estuaries. Higher ratios were recorded in the Tagus estuary, which may be explained by higher incident irradiance. In addition, seasonal studies carried out in the Eden and Tagus estuaries showed that the xanthophyll pool size increased by 10% in the summer months. The pool size was highest in the Tagus estuary. Concurrently, high values for the de-epoxidation state were recorded, with values for dt/(dt þ dd) > 0.35 recorded in the summer. At the Eden, the ratio never exceeded 0.3. The de-epoxidation state was higher in winter than in summer, which was ascribed to the low winter temperatures. During a vertical migration study, a negative relationship between chlorophyll a and the de-epoxidation state was observed. It is suggested that this relationship originates from 'micro-migration' within the biofilm. Migration within the euphotic zone may provide an alternative means for cells to escape photodamage. In this paper, we propose that both xanthophyll cycling and 'micro'-migration play an important role in photoacclimation and it appears that these processes operate in parallel to regulate the photosynthetic response.

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Changes in microphytobenthic chlorophyll a and EPS resulting from sediment compaction due to de-watering: opposing patterns in concentration and content

Cited by 81 publications

References 32 publications

Biodiversityecosystem function relationship in microphytobenthic diatoms of the Westerschelde estuary

Biodiversityecosystem function relationship in microphytobenthic diatoms of the Westerschelde estuary

Spatio-temporal changes in microphytobenthos structure analysed by pigment composition in a macrotidal flat (Bourgneuf Bay, France)

Photoacclimation in microphytobenthos and the role of xanthophyll pigments

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Changes in microphytobenthic chlorophyll a and EPS resulting from sediment compaction due to de-watering: opposing patterns in concentration and content

Cited by 81 publications

References 32 publications

Biodiversityecosystem function relationship in microphytobenthic diatoms of the Westerschelde estuary

Biodiversityecosystem function relationship in microphytobenthic diatoms of the Westerschelde estuary

Spatio-temporal changes in microphytobenthos structure analysed by pigment composition in a macrotidal flat (Bourgneuf Bay, France)

Photoacclimation in microphytobenthos and the role of xanthophyll pigments

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Biodiversityecosystem function relationship in microphytobenthic diatoms of the Westerschelde estuary

Biodiversityecosystem function relationship in microphytobenthic diatoms of the Westerschelde estuary