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In paleolimnology, downcore assemblages are taken to be representative of the plankton that were living at some moment in the past. To evaluate the fidelity of the deposited diatom assemblage to that of the living plankton, a twenty-year series of whole-water plankton samples was compared to surface-sediment diatoms. When standardized and pooled, the 81 quarterly plankton samples were composed of Aulacoseira (51%), Cyclostephanos and other discoid diatoms (28%), Asterionella (9%), and Fragilaria (8%). In the deposited assemblage, however, the rank of the two most-common taxa was reversed: Cyclostephanos+ outnumbered Aulacoseira (47 and 34%, respectively). Some littoral taxa were over-represented in sediments (e.g. Encyonema) while others were under-represented (e.g. Gyrosigma). The reasons for these differences appear unrelated to frustule dissolution, but may insteadrelate to sampling frequency, sampling depth, and lake-specific characteristics.
Kurt A. Haberyan. 2017. \u201cMozingo Studies II. Similarity of the Planktonic and Deposited Diatom Assemblages\u201d. Global Journal of Science Frontier Research - I: Interdisciplinary GJSFR-I Volume 16 (GJSFR Volume 16 Issue I3): .
Crossref Journal DOI 10.17406/GJSFR
Print ISSN 0975-5896
e-ISSN 2249-4626
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Total Score: 131
Country: United States
Subject: Global Journal of Science Frontier Research - I: Interdisciplinary
Authors: Kurt A. Haberyan (PhD/Dr. count: 0)
View Count (all-time): 161
Total Views (Real + Logic): 3560
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Publish Date: 2017 01, Wed
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In paleolimnology, downcore assemblages are taken to be representative of the plankton that were living at some moment in the past. To evaluate the fidelity of the deposited diatom assemblage to that of the living plankton, a twenty-year series of whole-water plankton samples was compared to surface-sediment diatoms. When standardized and pooled, the 81 quarterly plankton samples were composed of Aulacoseira (51%), Cyclostephanos and other discoid diatoms (28%), Asterionella (9%), and Fragilaria (8%). In the deposited assemblage, however, the rank of the two most-common taxa was reversed: Cyclostephanos+ outnumbered Aulacoseira (47 and 34%, respectively). Some littoral taxa were over-represented in sediments (e.g. Encyonema) while others were under-represented (e.g. Gyrosigma). The reasons for these differences appear unrelated to frustule dissolution, but may insteadrelate to sampling frequency, sampling depth, and lake-specific characteristics.
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