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|Authors:||Nevrova, E. L.|
Revkov, N. K.
Petrov, A. N.
|Title:||Structure of benthic diatoms taxocenes in modern conditions (Crimea, The Black Sea)|
|Keywords:||benthic diatoms;Bacillariophyta;multivariate statistics;pollutant;Crimea;the Black Sea|
|Abstract:||The total updated list of benthic diatoms from the Crimean coast, including 409 species and intra-species taxa has been prepared. More than a half (55%) of general floristic richness of the Black Sea benthic diatoms is formed by species of the Crimean coast. 48 new and 21 rare species have been revealed for Crimean coast, five of them were recognized as newly-found for the whole Black Sea and 4 species were new for science. The comparative structural analysis of benthic diatoms taxocenes from two water areas of Crimean coast have been carried out and based on methods of multivariate statistics. Those areas (Laspi and Sevastopol bays) have substantially differed by content of heavy metals and other pollutants in bottom sediments. The features of spatial organization of benthic diatoms habitats have been investigated for both bays. Statistically significant taxocenotic complexes and subcomplex groupings of diatoms were revealed in each of the bay. Development of diatom taxocene in Laspi bay is caused by worsening of optimal environmental conditions from the central part of the bay towards the both more shallow and deep-water zones. The peak of species richness values coincides with 16-20 m depth, and characterizes the middle sublittoral zone that is the most optimal one for diatom algae inhabitation. In Sevastopol bay the level of toxicants’ content in bottom sediments and water depth are the leading abiotic factors influencing on peculiarities of diatom taxocene structure. The differences in the structural pattern can be caused by presence an eurybiontic species and species having the highest parameters of development within the certain biotope at all stations of the investigated water area. Lists of principal species contributing the most input into similarity within taxocenotic complexes of each bay were compounded. Inter-complex differences in taxocenes structure are mostly pronounced and probably caused by different response of discriminating species to a high level of toxicants. Structural differences at sub-complex level are less pronounced and can be conditioned by similar reaction of discriminating species on joint influence of key environmental factors within a certain bay. The most significant discriminating species can also be considered as indicators of the diatom taxocenes condition under comparative assessment of biotopes subjected to miscellaneous anthropogenic load. It is proposed to consider Tabularia tabulata, Amphora proteus and Nitzschia reversa as indicators of conventionally healthy biotopes, whereas Tryblionella punctata, Diploneis smіthіі and Nitzschia sіgma can be considered as indicators of biotopes subjected to persistent technogenic impact.|
|Appears in Collections:||International Workshop On Black Sea Benthos|
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