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Effects of the halocline on water quality and phytoplankton composition in a shallow brackish lake (Lake Obuchi, Japan)

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Abstract

The relationships of the halocline to both water quality and phytoplankton composition in Lake Obuchi, a shallow brackish lake in northern Japan, were investigated from April 2001 to December 2004. The halocline in this lake became stronger in summer (July–September, mean maximum density gradient 4.3–5.8 ρ t m−1) but weaker in spring, fall, and winter (1.9–3.3 ρ t m−1). Although the difference in water quality between the upper and lower layers separated by the halocline was high in summer, nutrients (PO4 3−-P and NH4 +-N) were eluted from the bottom sediment as levels of dissolved oxygen decreased in the bottom layer because of the strong stratification caused by the halocline formed over the long term. Moreover, phytoplankton taxa composition also differed between the upper and lower layers in summer, but was similar in other seasons. The dominant phytoplankton taxa in the upper layer in summer were Skeletonema costatum and Cyclotella spp., whereas in the lower layer, Gymnodinium spp. (Dinophyceae) and Chlorophyceae, which prefer eutrophic and low dissolved oxygen conditions, dominated. This suggests that the halocline was related to differentiations in both water quality and ecosystem components between the upper and lower layers in the brackish lake water.

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Correspondence to Shinji Ueda.

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Ueda, S., Kondo, K. & Chikuchi, Y. Effects of the halocline on water quality and phytoplankton composition in a shallow brackish lake (Lake Obuchi, Japan). Limnology 6, 149–160 (2005). https://doi.org/10.1007/s10201-005-0153-x

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