جستجوی مقالات مرتبط با کلیدواژه « پرندگان مهاجر » در نشریات گروه « اکولوژی »

Conservation and development of biodiversity are some of the most important issues in lake management. Calculating and studying biodiversity is a difficult, time-consuming, and costly process, and there is no well-established and planned biodiversity guidance. The purpose of this study was to evaluate the significant reduction of Parishan lake biodiversity and its changes due to the reduction of habitat over fourteen years. Census data from 1997 to 2011 were collected and analyzed. In this study, based on the number of species in different conservation categories, 64 species of least concern (LC), 4 endangered species (NT), 2 endangered species (VU), and 1 endangered species (EN) were identified. The frequency of each family was observed with a total of 135347 birds. Most of the birds observed belonged to the Eurasian coot (Fulica atra) species of the Rallidae family. Some biodiversity indices (Simpson, Shannon-Wiener, and Camargo) were used to investigate the species biodiversity and evenness of birds during the years 1998 to 2012. The results showed that the Simpson index of 0.925 in 1998 to 0.348 in 2008 year. It was the second year that showed an increase in biodiversity over an eight-year period, and the Camargo Index confirmed the same results. To achieve this, Ecological Methodology software was used. Generally, the results of this study showed that decreasing the water level of Parishan lake significantly reduced the biodiversity of many species.

In the present study, the wintering birds of the artificial wetlands of Yazd province in 1393, 1395 and 1396 were studied. This study is one of the first studies conducted with the aim of preventing the drying process of the wetland by emphasizing on maintaining water rights and protection of migratory birds in the artificial wetland of Yazd. Data from winter and autumn counts which were carried out in 2014, 2016, and 2017, were gathered and analyzed. In this study, 48 bird species (18 species of aquatic, 18 species of waterside and 12 species waterside) were identified. The highest numbers belonged to the Fulica atra (528 individuals), Sturnus vulgaris (500 individuals) and Anas platyrhynchos (130 individuals) respectively. Among aquatic birds, the highest number of species were represented by the family of Scolopacidae (6 species). Furthermore, the family of Rallidae represented the highest number (531 individuals comprising of 3 species). The highest and lowest numbers were 2750 and 819 individuals in 2017 and 2016 respectively. The highest evenness was observed in 2016 (0.62) and the lowest in 2014 (0.39). The most diversity of Simpson and Shannon-Winer in 2016 were 4.32 and 2.01 respectively. This study has shown that the artificial wetland of Yazd, in addition to protecting and maintaining water birds, is also important for the conservation and providing habitats for terrestrial birds and thus protecting it should be of utmost importance.