A centrifugation method for measuring the relative density (specific gravity) of planktonic rotifers (Rotifera), with values for the relative density of Polyarthra major Burckhardt and Keratella cochlearis (Gosse)

Saunders-Davies, A. P.; Pontin, Rosalind M.

doi:10.1007/bf00025768

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1989

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“…ONGE and PRICE (1975) when adding trimetaphosphate or dextran sulfate to Ludox-AM. SAUNDERS-DAVIES and PONTIN (1987) used Ficoll to measure the relative density of rotifers. (1977) used this addition in sorting zooplankton by isopycnic sedimentation at one gravity.…”

Section: Introductionmentioning

confidence: 99%

Isolation and analysis of particulate detritus as an aid to studies on the nutritional ecology of deposit feeders

Dorgelo

Leonards

1989

Hydrobiological Bulletin

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By submitting detritus s.L, consisting of the fractions particulate detritus s.s., mineral particles, mesofaunal elements, cyanobacterial colonies and other microalgae such as diatoms, to density gradient centdfugation (DGC) in Percoll and Ludox-TM the major part of detritus s.s. could be separated. Qualitative analysis of the fractions proved that the organic carbon content and (to a small extent) the nitrogen content of the fractions distinguished after DGC were higher than those of the detritus s.L before DGC, probably due to contamination with the gradient material. These results as well as the problems of quantifying the natural food of deposit feeders are discussed.

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Section: Introductionmentioning

confidence: 99%