The Benthic Algae of Some Streams in Southern England: I. Biomass of the Epilithon in Some Small Streams

Marker, A. F. H.

doi:10.2307/2258699

Cited by 77 publications

(41 citation statements)

References 10 publications

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“…Using similar techniques, extracts of pigments from a healthy epilithic population of the diatom Melosira varians contained low levels of chlorophyll a breakdown products (Table II), confirming earlier studies on healthy populations (Marker, 1976a;Marker & Casey, 1982).…”

Section: Discussionsupporting

confidence: 84%

“…The loss of chlorophyll rather than phaeopigments suggests that the community becomes unstable rather than that the community decays. In earlier studies (Marker, 1976a;Marker & Gunn, 1977;Marker & Casey, 1982), chlorophyll a was estimated by using simple spectrophoto-* Dedicated to Professor G. E. Fogg on his retirement by A. F. H. Marker, research student 1960Marker, research student -1963 metric acidification techniques (Lorenzen, 1967a;Marker, 1972). These techniques do not distinguish between chlorophyll a and magnesium-containing derivatives (i.e.…”

mentioning

confidence: 99%

“…As the spring diatom populations are not very firmly attached, the suspended solids could be looked upon as an integrated sample of the attached diatoms. Rather than undertake an extensive sampling programme of the attached algae in situ, which requires extensive replication (Marker, 1976a), suspended solids were used in this preliminary study to investigate more fully the nature of the chlorophyll breakdown products. The aims of this study were firstly to determine whether Mg-containing derivatives, particularly chlorophyllide a, were significant at any time during the rise and fall of the attached diatom community, and secondly to determine the relative importance of phaeophytin a and phaeophorbide a.…”

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confidence: 99%

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Studies on epilithic and epiphytic diatoms in a chalkstream: Comparative estimates of chlorophyllaand its derivatives

Marker

Hopgood

Randall

1986

British Phycological Journal

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Section: Discussionsupporting

confidence: 84%

mentioning

confidence: 99%

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confidence: 99%

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Studies on epilithic and epiphytic diatoms in a chalkstream: Comparative estimates of chlorophyllaand its derivatives

Marker

Hopgood

Randall

1986

British Phycological Journal

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“…Other work of note is that of McIntire (1968) in U.S.A. and Marker and colleagues in England (Marker, 1976a(Marker, , 1976bMarker & Gunn, 1977;Casey, Clarke & Marker, 1981;Marker & Casey, 1982;Marker & Willoughby, 1988). These groups studied natural populations and populations in circulating artificial streams.…”

Section: Historicalmentioning

confidence: 99%

Diatoms in river water-monitoring studies

1991

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Diatoms grow abundantly in rivers, colonising almost all suitable habitats. They have been used extensively in studies related to the monitoring of water quality. This review attempts to draw together data from a wide variety of approaches. The advantage of sampling discrete habitats is stressed and particular attention is paid to the diatom flora of stone surfaces (epilithon) which is the favoured source in many studies. The advantages and drawbacks of the techniques are discussed and some hopefully helpful suggestions made. The historical development of the topic is briefly surveyed, but no attempt has been made to present a comprehensive review of the literature which has increased enormously in the last few decades.

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“…The biomass of epilithic algae has often been estimated by measuring the amount of chlorophyll a (in mg) that they contain and then multiplying by 50 to give the approximate organic dry weight biomass (in mg) (Vollenweider et al, 1974 ;Marker, 1976) . It would be possible to apply this method to the epiphytic algae detached from Ranunculus .…”

Section: Introductionmentioning

confidence: 99%

Seasonal changes in composition and biomass of epiphytic algae on the macrophyte Ranunculus penicillatus in a chalk stream, with estimates of production, and observations on the epiphytes of Cladophora glomerata

Shamsudin

Sleigh

1995

Hydrobiologia

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The epiphytic algae on surfaces of the macrophyte Ranunculus penicillatus (Dumort .) Bab . var. calcareus (R . W. Butcher) C . D . K. Cook and on Cladophora glomerata (L .) Kiitz growing in the River Itchen at Otterbourne near Southampton were studied between February 1984 and June 1985 . The river at this site has a mean flow rate of 0 .33 m s -1 , and is about 16 m wide and on average 20 cm deep, with a discharge ranging through the year between 0.34 and 2 .46 m 3 s -1 . The pH of the river varies little around 8 .2, with a mean alkalinity of 236 mg HCO3 1 -', because of its origin from chalk springs . Ranunculus grows throughout the year, with peaks of biomass in spring and autumn . It forms a very large surface for attachment of epiphytes, and covers on average 40% of the stream bed . Numbers of epiphyte cells removed from Ranunculus ranged through the year between 52 x 103 and 271 x 103 cells mm -2 stream floor, with maximum numbers in April, and a secondary peak in October. This pattern partly reflects fluctuations in the biomass of Ranunculus ; the number of cells per unit area of plant surface showed a broader spring peak and lower fluctuations in other seasons . Diatoms formed 65 to 98% of these epiphyte cells, with chlorophytes reaching their peak (10%) in summer and cyanophytes (25%) in autumn . Estimates of biomass of these epiphytic forms, derived from measurements of chlorophyll c, indicate a range between 30 and 100 g dry weight m -2 of weed bed .Colonisation studies showed that the algae grow and reproduce throughout the year, with a mean generation time of about 5 days, suggesting an annual production of about 3 kg dry weight m -2 of weed bed, which makes epiphytic algae the principal primary producers in the stream . The numbers and biomass of epiphytic algae on Cladophora are considerably less .The species of epiphytic algae found on Ranunculus were generally similar to those growing on Cladophora, and to epilithic algae on pebbles of the stream bed, but different species were dominant on the different substrata . Algal cells in the water column were all derived from benthic habitats, although their relative abundance was very different .

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The Benthic Algae of Some Streams in Southern England: I. Biomass of the Epilithon in Some Small Streams

Cited by 77 publications

References 10 publications

Studies on epilithic and epiphytic diatoms in a chalkstream: Comparative estimates of chlorophyllaand its derivatives

Studies on epilithic and epiphytic diatoms in a chalkstream: Comparative estimates of chlorophyllaand its derivatives

Diatoms in river water-monitoring studies

Seasonal changes in composition and biomass of epiphytic algae on the macrophyte Ranunculus penicillatus in a chalk stream, with estimates of production, and observations on the epiphytes of Cladophora glomerata

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