EVALUATION OF REPRODUCIBILITY AND RELIABILITY OF BENTHIC DIATOMS SPECIES COMPOSITION AT COASTAL LOCATION OF SW CRIMEA
Keywords:
benthic diatoms, Bacillariophyta, species diversity, species accumulation curves, estimation methodol-ogy, Black SeaAbstract
Benthic diatoms species richness analysis had been conducted at near shore location (S = 0.8 km2) nearby mouth of r. Belbek (SW Crimea, Black Sea). Totally 10 stations (by 6 replicates per each ones) were sampled in November 2009 on sandy-muddy substrate within depth range 6 – 19 m. At total, 267 diatom species were found by microscoping of permanent slides. The share of mass species consisted 26.0 – 74.4 % of total species number registered for each station. Comparative assessment of the diatom expected species richness (Sexp) was performed by results of 4 estimators (Jack-knife-1 & 2, Chao-2 and Karakassis-S∞). Estimator S∞ had shown the most precise evaluation of Sexp values. The other estimators displayed more overestimated results of the Sexp (32 to 47 % higher than Sobs). One any sample is required in order to reveal about 35 % of the species, 2 samples are required to include in the data set about 50 % of the species. To reveal 80 % of species, more than 6 samples are required. The statistical assessment of the results reproducibility of diatoms species composition under comparison of 6 independent replicates (taken from each of 10 sampling stations) was performed and the reliability of differences between different stations was also evaluated. The average species similarity coefficient for any pair of samples from the same station was significantly higher (1.6 – 2.5 times) than the similarity coefficient between any pair of samples taken from different stations. The differences in diatom species richness between any replicates from the same station were non-significant.
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