"Ecological importance of taxonomic signs of lactic acid bacteria". By Sergei Rosen. //Abstracts of 8th International congress of bacteriology and applied microbiology division.Jerusalem, Israel, August 18-23, 1966, p. 75.
The raised task was to select from Bergey's Manual-8 the identification signs only those with the attached ecological importance, to calculate the total index of adaptability of ever species to the conditiones of habit (the ecologic potential), and to compare the quantity of potential to the data about prevalence. 22 tests were selected for streptococci and lactobacilli as well and 26 for leuconostoci. They were tests on tolerance and polysaccharide decomposition and fermentation of carbohydrates and related substances. In each genus the species with the bigger number of positive tests (from the selected amount) was given the potential 100,this index was falling with streptococci till 33, leuconostoci till 28, lactobacilli till 26 with decreating of the number of positive tests. The data about prevalence of different species were taken from literary summary (bactoflora Russia/USSR, 100 year period,more than 20 thousand strains in the selection) and
from the own experimental data about Armenia (approx. one thousand strains). The following number of strains were obtained (the potential is underlined, the number of strains are separted by oblique stroke according to literal and experimental data):
T h e r m o b a c t e r i a. Lactobacilus acidophilus 67: 1486/0; L.salivarius 67:7/97; L.lactis 51:290/53; L.delbrueckii 28:17/0; L.helveticus 26: 22/22;
S t r e p t o b a c t e r i a. L.plantarum 100: 1618/85; L.casei 85: 201/6;
L.xylosus 82: 0/11
B e t a b a c t e r i a. L.cellobiosus 74: 56/0; L.fermentum 59:408/4; L.brevis 44:389/0; L.buchneri 44:165/0.
E n t e r o c o c c i. Streptococcus faecalis 100: 8504/289; Str. faecium 91:4193/38; Str.uberis 86:0/7; Str.avium 78:0/11.
L a c t o c o c c i. Str. lactis 58: 3350/30; Str.cremoris 33:88/14.
L e u c o n os t o c i. L. mesenteroides 100: 494/0;L.paramesenteroides 89:0/20;
L.dextranicum 83:207/0; L. cremoris 28: 15/0.
It can be seen from the jbtained results that in every genus andsubgenus a species with the biggest ecological potential is spread to the greatest degree. The given data are support to be evidence of the ecological importance ofthe selected signs.