that of Lim (1998) in Southeast Asia. We haven′t calculated the statistical parameters for G. fusci because Q. kobinensis was absolutely predominant .There were only 93 specimens of G. fusci collected and it was far less than the number of Q. kobinensis . The seasonal populationdynamics of a monogenean is related to complex environmental parameters especially water temperature ( Chubb,1977 ) as e.g., MO (1992) found Gyrodactylus salaris through most of the year except 2-3 months when temperature had fallen to almost 0 °C; Jansen & Bakke (1993) found
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A new locality of Pulsatilla patens (L.) Mill. in the Wyszków-Jegiel Forest District, in the southern part of Puszcza Biała (ATPOL EC79) is described. This locality is situated on an escarpment, at the edge of Peucedano-Pinetum fresh pine forest with elements of Serratulo-Pinetum mixed pine forest and Potentillo albae-Quercetum steppe oak forest. Good light conditions prevail in the place of plant occurrence. Studies carried out in 2008-2015 showed an increasing trend of P. patens population, though, recently, this population seems to be stable. The number of species accompanying the pasque-flower also increased in this time period. It was found based on the analysis of flora directly neighbouring the clumps of the pasque-flower. During 7 years, the number of taxa increased by 31.5% on plot I and by 25% on plot II. In the years 2011-2013, the pasque-flower was represented both by flowering (1-2) and vegetative individuals. Afterwards, the plant was present only in vegetative stage. The number of its leaves varied in time. The highest number of leaves - 14 per individual - was noted in 2014, and the lowest number (1) - in 2012. The reason for a decline in the number of plant clumps in the site Dalekie and, at the same time, the greatest threat was the excavation of sand from the escarpment. In 2012, this escarpment slid down and several clumps of the pasque-flower were destroyed. Forest management and digging up by wild boars were additional factors limiting the population. To preserve the site of P. patens, measures of active protection should be applied.
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Kubát K. et
The paper deals with a mathematical model for two interacting populations. Under the assumption of fast stochastic contacting of populations, we derive stochastic Poisson-type differential equations with a small parameter and propose an approximative algorithm for quantitative analysis of population dynamics that consists of two steps. First, we derive an ordinary differential equation for mean value of each population growth and analyse the average asymptotic population behaviour. Then, applying diffusion approximation procedure, we derive a stochastic Ito differential equation for small random deviations on the average motion in a form of a linear non-homogeneous Ito stochastic differential equation and analyse the probabilistic characteristics of the Gaussian process given by this equation.
Nonlinear PDEs: The Role of the Simplest Equation. Commun Nonlinear Sci Numer Simulat, 16 (2011), 4215-4231.
 Vitanov, N. K., Z. I. Dimitrova. Application of the Method of Simplest Equation for Obtaining Exact travelling-wave Solutions for Two Classes of Model PDEs from Ecology and PopulationDynamics. Commun Nonlinear Sci Numer Simulat, 15 (2010), 2836-2845.
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