Arcellinida (testate lobose amoebae) were examined in surface-sediment samples collected in 2015 from throughout Harvey Lake, New Brunswick, Canada to assess whether the passage of Post-Tropical Storm Arthur in 2014 impacted the distribution of taxa and assemblages. Cluster analysis and non-metric multidimensional scaling (NMDS) revealed four distinct arcellinidan assemblages. Redundancy Analysis (RDA) and partial-RDA results were used to identify four variables that significantly influenced the assemblage composition and explained 20.2% of the faunal distributional variability. Arsenic concentration in the sediments of Harvey Lake is an important control over the distribution of Arcellinida assemblages. Shallower water (less than median water depth of 3.56 m) and highly diverse assemblages A3 and A4 (median SDI = 2.6) significantly correlated with wind-mixing probability , while deeper water (greater than median = 6.2 m) and moderately to highly diverse assemblages A1 and A2 (SDI range 2.4 -2.7) associated strongly with EM2. End Member 2 was derived from the suspension of and redeposition of sediments when the storm water wave base was deepened during the passage of Arthur. Water depth of sampling stationsPowered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporation should be taken into consideration in lakes that may be periodically impacted by large storms.
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