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Table 3 Estimated taxa richness according the abundance-based coverage estimator (ACE) and Chao1 for the four study sites in the Danube Delta Biosphere Reserve (Romania) during the sampling period in 2014

From: Pilot longitudinal mosquito surveillance study in the Danube Delta Biosphere Reserve and the first reports of Anopheles algeriensis Theobald, 1903 and Aedes hungaricus Mihályi, 1955 for Romania

  Dunărea Veche Lacul Roșuleț Letea Sulina
Observed number of taxa 8.000 9.000 12.000 12.000
Chao1 8.000 9.000 12.000 15.000
Chao1 standard error 0.000 0.000 0.000 4.517
ACE 8.000 NaNa 13.380 NaNa
ACE standard error 0.935 NaNa 1.708 NaNa
  1. aCalculation of the ACE not possible, because all rare species (<10 specimens) contained only a single specimen