A method to assess the gas resistance of woody plants was developed based on the level of inhibition of the photosynthetic activity of leaves exposed to toxic gases in the laboratory and could be ...used to identify plants resistant to environmental pollution for further practical and breeding use. The effective quantum yield of photosystem II was used as an indicator of genotype tolerance. The sensitivity of the indicator was sufficient to differentiate control and experimental variants. The objects under study were ranked according to the degree of gas resistance. Recommendations were given for the practical application of the new method.
Fast development of mariculture in the world leads to increasing of the load on natural habitats, especially due to organic enrichment. There are a few investigations concerning the effect of ...additional organic loading on the Arctic benthic communities. The main goal of our research was to ascertain the impact of mussel farm on the benthic community in the White Sea and its following recovery after mussel farm removal. We performed annual observations from 1988 to 2011. During the mussel farm functioning, two stages of organic enrichment impact on community structure were recorded: in the first 2 years, diversity and proportion of deposit feeders increased but later all studied characteristics of the benthic community decreased significantly. After the mussel farm removal, the benthic community started to restore and we distinguished several stages of recovery succession. Native structure of benthic community began to recover 8 years after organic loading had ceased, when selective deposit feeding bivalves
Portlandia arctica
Gray appeared in the benthos. 4–6 years later it became the only dominating species in the studied benthic community. Therefore, in the White Sea, native structure recovery of the Arctic benthic community after the severe disturbance took about 15 years.
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