title: [Regularities in the variability of species structure of costal littoral kelp: the model analysis].
abstract: The model describes species structure of competitive community, inhabiting stochastically variable environment.  Species list of this community, rearranged accordingly decreasing species abundance, can be described by decreasing geometrical series.  According to the model, the value of coefficient of this progression q should be q = exp(-1) = 0.368.  The actual data do not contradict statistically to this model constant.  Seasonal variability of species structure in biotopes is observed.  These biotopes differ one from another by the stability and heterogeneity levels of environmental conditions, estimated with the help of expert evaluation. Total community biomass shows two seasonal peaks; at winter and at spring - summer.  Maximal values of total biomass are observed in the biotope with intermediate level of environment stability.  The number of species is increased simultaneously with the growth of environmental stability.  The level of species abundance equitability grows up too in these conditions.  The model of geometric series describes the species structure of the macroalgae community quite adequately.  At the same time, the positive correlation between sample's species richness and equitability of species structure results in the outcome that after all samples averaging the biomass distribution of species is approximately more accurately not by geometrical series but by power model. The new  statistical method is offered in the application to this work.  It allows the expose of statistically significant not monotone essential non-linear relations of nonquantitative (order-type) arguments.
authors.forename: V V
authors.initials: VV
authors.lastname: Sukhanov
authors.forename: V E
authors.initials: VE
authors.lastname: Zhukov
mesh_terms: D018533:Biomass; D017753:Ecosystem; D008954:Models, Biological; D015233:Models, Statistical; D012621:Seasons; D012624:Seaweed / Q000145:classification / Q000254:growth & development / Q000502:physiology*; D013045:Species Specificity; D035962:Zosteraceae / Q000502:physiology