Search results

Search:
in the keywords: RUSSIA

Sort By:

Limit search:

Experience of using phytoperiphyton monitoring in urban watercourses

100%

Komulaynen S.

Oceanological and Hydrobiological Studies

2004

issue 1

65-75

The purpose of this paper is to assess how informative phytoperiphyton structural parameters are, and to assess the feasibility of using them for biological monitoring of river quality. The spatial distribution of the attached algae community was studied in some of rivers in Republic of Karelia (NW Russia). The influence of anthropogenic impacts on periphyton communities was analysed in terms of species richness, species diversity, species ecology values, biomass and chlorophyll concentration. All rivers are subjected to different kind of anthropogenic impacts in addition to natural disturbance. With regards to the species composition the differences between the urban and natural stretches of rivers are obvious. The data obtained demonstrate that the phytoperiphyton communities in urban streams are dominated by broadvalent, pollution-tolerant and even saprophilic taxa. Substantial changes in periphyton structure were often caused by an enhanced mechanical impact by storm run-off, which retarded colonisation, rather than any chemical influence. The burial of algae by sand and silt resulted in the loss of species or entire algal assemblages were observed. As result the communities are dominated by a few species with high recolonization potential.

Adult diapause and its physiological characteristics in the rageweed leaf beetle, Zygogramma suturalis F. (Coleoptera, Chrysomelidae), introduced to Russia fron North America

88%

Vinogradova E., Pantyuchov G.

Folia Biologica

1995

vol. 43

issue 3-4

137-141

From 1984-1991 in the Stavropol territory of Russia the strategy of seasonal development was studied in the rageeed leaf beetle Zygogramma suturalis F.During the laboratory and field studies a great diversity of the female adult diapause was revealed.It differs in the time of appearance, its duration and biological significance.The incidence of diapause varies considerably in different years.Sometimes it ensures the formation of an overwintering population, and other times it changes the duration reproduction and affects the abundance of the next generation.Respiraton intensity is a significant index of the physiological state of beetles.The oxygen consumption in diapausing females is 2-5 times lower than in active reproducing ones; in young 2-6 days old beetles the highest respiration level is observed.Relatively short spring and summer diapause is characterized by the same low metabolism rate as the very long summer-winter or autumnal-winter one.The males have a higher respiration rate than females, but seasonal pattern of the male respiration resembles the female one.

Refine search results

1 Folia Biologica

1 Oceanological and Hydrobiological Studies

1 2004

1 1995

1 Komulaynen S.

1 Pantyuchov G.

1 Vinogradova E.

Search results

Experience of using phytoperiphyton monitoring in urban watercourses

Adult diapause and its physiological characteristics in the rageweed leaf beetle, Zygogramma suturalis F. (Coleoptera, Chrysomelidae), introduced to Russia fron North America