Detectability of fifteen aquatic micro/mesocosms |
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Authors: | Hans Sanderson Brian Laird Richard Brain Christian J. Wilson Keith R. Solomon |
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Affiliation: | (1) Department of Policy Analysis, National Environmental Research Institute, Aarhus University, Frederiksborgvej 399, Post Box 358, 4000 Roskilde, Denmark;(2) Department of Soil Science, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5A8, Canada;(3) Department of Environmental Studies, Center for Reservoir and Aquatic Systems Research, Baylor University, Waco, TX 76798, USA;(4) Canadian Food Inspection Agency, Ottawa, ON, K1A 0Y9, Canada;(5) Toxicology, Department of Environmental Biology, University of Guelph, Guelph, ON, N1G 2W1, Canada |
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Abstract: | Zooplankton abundance and species richness in 15 untreated 12,000 L outdoor microcosms (n = 15) were monitored over the course of 1 year to document the inherent variability and statistical detectability between replicates. Statistical power analysis were applied to derive the statistically minimal detectable difference (MDD) between replicates with default values set at; α = 0.1 and β = 0.2. Copepod abundance and species richness generally demonstrated the best detectability at 0.31 and 0.16, respectively, (n = 15); 0.59 and 0.33 (n = 3). Total zooplankton abundance and species richness had the lowest detectabilities at 0.19 and 0.14, respectively, (n = 15); 0.35 and 0.3 (n = 3). Rotifers, due to their opportunistic and rapid life traits, had the lowest single-species abundance detectabilities at 0.54 (n = 15); 0.8 (n = 3), whereas macroinvertebrate species richness had the lowest detectability at 0.43 (n = 15); 0.7 (n = 3) over 1 year. We recommend a priori calibration of the study design relative to relevant MDDs. Moreover, it is suggested to consider alternatives to statistical null hypothesis testing. |
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