The study of biodiversity of overwintering birds in different parts of Boujagh National Park (Guilan province)

Measurement of the biodiversity of overwintering birds is a very important issue in ecology and wetland management. In the present study, 8 orders of overwintering birds (waterfowl, shorebirds and wetland-dependent bird species) belonging to 17 families, 39 genera and 73 species were identified and bird census and survey techniques were calculated based on total counts from mid-Dei to mid-Bahman in the different parts of Boujagh National Park (located in Guilan province). Then the biodiversity of birds was calculated using Margalef's species richness indices, Simpson’s, Shannon-Wiener’s and Brillouin’s diversity indices, Buzas-Gibson’s evenness index during a 3-year study period (1390-1392). Based on the obtained results of biodiversity indices, the highest Margalef's richness and also the highest species diversity (in relation to all three Simpson’s, Shannon-Wiener’s and Brillouin’s diversity species indices) were observed in Boujagh’s wetland indicating the favorable conditions in the given part of wetland. The outcomes also showed that the highest species evenness was obtained at the mouth of Sefidrod River. Based on the results of one-way analyze of variance (ANOVA) test, there were significant differences between different parts of the National Park Boujagh and the Margalef's species richness indices as well as Buzas-Gibson’s evenness index (p