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1 October 2017 The Influence of Dissolved Oxygen on Dinoflagellate Cyst Distribution Across Sluice Pond, a Meromictic Lake in NE Massachusetts, USA
Francine M. G. McCarthy, Matea Drljepan, J. Bradford Hubeny, Andrea M. Krueger, Paul Michael Pilkington, Nicholas L. Riddick, Michael D. MacKinnon
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Abstract

Assemblages of dinoflagellate cysts in lakebed sediments across the deep, meromictic basin of Sluice Pond (Lynn, Massachusetts) were compared with measurements of water quality and sediment geochemistry and with testate amoeba and tintinnid assemblages. Lakebed sediments below oxygenated waters (DO >2 mg/L) contain diverse testate amoebae, but sparse Peridinium willei-dominated dinoflagellate cyst assemblages. Sediments collected under hypoxic conditions (DO < 2 mg/L) showed higher preservation of organic carbon and nitrogen, and these deep basin sediments are characterised by diverse dinoflagellate cyst assemblages, but sieved microfossil assemblages are typically dominated by the planktonic Codonella cratera and the pseudo-planktonic Cucurbitella tricuspis. Strong inverse relationships of cysts of Peridinium willei (R2 = 0.81) and Difflugia oblonga tests (R2 = 0.7) with water depth are attributed to variations in bottom water oxygen concentrations. Both ecological and taphonomic factors must be considered when reconstructing palaeoenvironments from microfossil assemblages.

© 2016 AASP — The Palynological Society
Francine M. G. McCarthy, Matea Drljepan, J. Bradford Hubeny, Andrea M. Krueger, Paul Michael Pilkington, Nicholas L. Riddick, and Michael D. MacKinnon "The Influence of Dissolved Oxygen on Dinoflagellate Cyst Distribution Across Sluice Pond, a Meromictic Lake in NE Massachusetts, USA," Palynology 41(4), 516-532, (1 October 2017). https://doi.org/10.1080/01916122.2016.1276027
Published: 1 October 2017
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