Detail of "11004-68-5"

Reference

Specific blue-green algal carotenoids in sediments of Esthwaite Water

Specific blue-green algal carotenoids in sediments of Esthwaite Water. Griffiths, Mary (Dep. Zool., Univ. Washington, Seattle, Wash., USA). Limnol. Oceanogr., 23(4), 777-84 (English) 1978. CODEN: LIOCAH. ISSN: 0024-3590. DOCUMENT TYPE: Journal CA Section: 61 (Water) Two cores from Esthwaite Water have been analyzed for oscillaxanthin (I) [25217-88-3] derived from Oscillatoria alone, and myxoxanthophyll (II) [11004-68-5] found only in blue-green algae. II profiles are similar for the two cores with max. at 6-7 cm and 14-16 cm and low values in the top 5 cm and below 17-19 cm. I follows the same general pattern but without pronounced max. Such profiles can be used to indicate the appearance of Oscillatoria and other blue-green algae in a lake, and indirectly, the onset of eutrophication. Raw data for the blue-green algae present in the lake between 1948 and 1976 have been analyzed. When the years of maximal algal counts in the lake are correlated with the depths of II max. in the sediment, an annual sedimentation rate for the top 15 cm of 0.6 cm/yr is obtained, which agrees quite well with results by other methods.

Measurement and interpretation of sedimentary pigments

Measurement and interpretation of sedimentary pigments. Swain, Edward B. (Limnol. Res. Cent., Univ. Minnesota, Navarre, MN 55392, USA). Freshwater Biol., 15(1), 53-75 (English) 1985. CODEN: FWBLAB. ISSN: 0046-5070. DOCUMENT TYPE: Journal CA Section: 61 (Water) Section cross-reference(s): 53 The factors that control the concns. of pigments in lake sediments were studied using the data from transects across lake basins, surface samples from oligotrophic and eutrophic lakes, and 2 210Pb-dated short cores. Both the chlorophyll a (I) [479-61-8]-carotenoid ratio and the oscillaxanthin (II) [25217-88-3]-myxoxanthophyll (III) [11004-68-5] ratio are mostly detd. by the quality of autochthonous prodn. rather than by preservation conditions. The chlorophyll deriv.-total carotenoid ratio values were higher in oligotrophic lakes than in eutrophic lakes due to differences in the prodn. of the 2 pigments. The stratigraphy of percent native I appeared to record the hypolimnetic O concns. at the time of deposition. The II-III ratio was a degrdn.-immune indicator of the relative prodn. of several correlated mechanisms that tended to produce higher sedimentary pigment concns. in eutrophic lakes. Since most of these mechanisms, e.g., hypolimnetic O consumption, indirectly translate higher primary prodn. into higher sedimentary pigment concns., the latter are sometimes misleading, and pigment accumulation rate may be a better indicator for past primary prodn.