Advances in Microbial Ecology by Ronald M. Atlas (auth.), K. C. Marshall (eds.)

By Ronald M. Atlas (auth.), K. C. Marshall (eds.)

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Patrick (1963) found that algal diversity was lower in polluted streams than in relatively pristine waterways (Fig. 3). Marshall et al. (1981) carried out an in situ study of cadmium and mercury stress in the plankton community of a lake in Northwestern Ontario, Canada. 2 X 10- 8 M/liter for both Cd and Hg. Potentially toxic concentrations of Cd may occur in many contaminated lakes, but toxic concentrations of Hg probably occur in few lakes. Eloranta and Kettunen (1979) examined the impact of discharges from a paper mill.

Sci. Hung. 25:187-222. Basharin, G. , 1959, On a statistical estimate for the entropy of a sequence of independent random variables, Theory Probab. Its Appl. (USSR) 4:333-336. Bell, C. , Holder-Franklin, M. , 1980, Heterotrophic bacteria in two Canadian rivers. I. Seasonal variations in the predominant bacterial populations, Water Res. 14:449-460. Bell, C. , Holder-Franklin, M. , 1982, Correlations between predominant heterotrophic bacteria and physiochemical water quality parameters in two Canadian rivers, Appl.

They found that there was an inverse relationship between bacterial biomass and species diversity in surface waters, but diversity was near maximal in sediments regardless of the size of the bacterial community. The inverse relationship between cell number and species diversity is in accordance with the general ecological principle that suggests that elevated populations in resource-limited habitats reflect the success of relatively few well-adapted (opportunistic) species. The similar levels of diversity in sediments at all locations suggest that these marine sediment communities are not severely stressed by environmental factors and thus achieve a high level of diversity characteristic of biologically accommodated communities.

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