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Effect of sampling effort and sampling frequency on the composition of the planktonic crustacean assemblage: a case study of the river Danube

Abstract

Although numerous studies have focused on the seasonal dynamics of riverine zooplankton, little is known about its short-term variation. In order to examine the effects of sampling frequency and sampling effort, microcrustacean samples were collected at daily intervals between 13 June and 21 July of 2007 in a parapotamal side arm of the river Danube, Hungary. Samples were also taken at biweekly intervals from November 2006 to May 2008. After presenting the community dynamics, the effect of sampling effort was evaluated with two different methods; the minimal sample size was also estimated. We introduced a single index (potential dynamic information loss; to determine the potential loss of information when sampling frequency is reduced. The formula was calculated for the total abundance, densities of the dominant taxa, adult/larva ratios of copepods and for two different diversity measures. Results suggest that abundances may experience notable fluctuations even within 1 week, as do diversities and adult/larva ratios.

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Correspondence to Levente Hufnagel.

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Vadadi-Fülöp, C., Hufnagel, L. & Zsuga, K. Effect of sampling effort and sampling frequency on the composition of the planktonic crustacean assemblage: a case study of the river Danube. Environ Monit Assess 163, 125–138 (2010). https://doi.org/10.1007/s10661-009-0822-z

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Keywords

  • Sample size
  • Seasonal dynamics
  • Diversity
  • Copepoda
  • Cladocera