Document Type : علمی - پژوهشی
MSc Graduated of Environmental Science, Department of Environmental Science, Faculty of Fishery and Environmental Science, Gorgan University of Agricultural Sciences and Natural Resources
Associated Prof., Department of Environmental Science, Faculty of Fishery and Environmental Science, Gorgan University of Agricultural Sciences and Natural Resources
This study investigated the effect of density and other properties of dead trees on the bird community in Golestan National Park during the autumn of 2013. Birds and various environmental variables were detected within a 25 m radius of each of 100 sampling points. The relationship between biological diversity and the relative abundance of bird species to the environmental variables related to the dead tree characteristics was evaluated. To determine the association of bird diversity indices with environmental variables, a canonical correspondence analysis (CCA) was performed. The first axis of CCA successfully separated the two groups of birds. The first group of birds comprised the Lagea Rock Nuthatch, Black Woodpecker, Winter Wern, Nutatch, Great Tit, Great Spotted Woodpecker, Erosian Jay, Nightingale and Common Blackbird which had a positive correlation with some factors of dead trees, such as: the first and second axes of standing dead trees (snags) and fallen dead trees (logs), wood surface conditions of snags, degree of decay of logs, height at which food is found of snags, condition of canopy in snags, length of logs and presence of nests. The second group was on the right-hand side of the axis and included such species as: Coal Tit, Song Thrush, Long-tail Tit, River Warbler, Flycature, Green Woodpecker, Stonechat, Hawfinch, Pheasant and Common Chiffchaff. These birds had a positive correlation with the following environmental variables: the third and fourth axes of logs and the fourth axis of snags.
- Kooch Y, Hosseini S.M, Akbarian M, Tabari M, Jalali Gh. The role of dead tree in regeneration density of mixed beech stand (case study: Sardabrood forests, Chalous, Mazindaran).Iranian Journal of Forest; 2010; 2(2): 93-103. [In Persian
- Ravanbakhsh H, Marvie Mohajer M.R, Etemad V. Natural regeneration of woody sp ecies in woodlands of southern slopes of Elborz mountains( case study: Latian Watershed). Iranian Journal of Forest;2010;. 2 (2): 113-125.
- [In Persian]
- Bagne K, Purcel K, Rotenberry J. Prescribed fire, snags population dynamics,and avian nest site selection. Forest Ecology and Management ; 2008; 255:95-105.
- Whitman A, Hagan J. An index to identify late - success ional forest in temperate and boreal
- Zones. Forest Ecology and Management; 2007; 246: 144 - 154.
- Martin K, Eadie J. M. Nest webs: a communitywide approach to the management and conservation of cavity nesting forest birds. Forest Ecology and Management;1999;115: 243- 257
- Mark E H, Christopher W, Becky F, Jay S , Misha, Y. Differences Between Standing and Downed Dead Tree Wood Density Reduction Factors: A Comparison Across Decay Classes and Tree Species. Forest Service, United States Department of Agriculture.; 2011.p.7.
- Baptiste R, Denis C, Loren K, Jean-Franc O, Christian K. Tree microhabitats as indicators of bird and bat communities in Mediterranean forests. Ecological Indicators;2013; 34 :221â 230.
- Mohammadnejad K, Rahmani R. The Effects of Dead Trees on Abundance Natural regeneration in mixed Fagus and Hornbeam Forests. Iranian Journal of Natural Resources;2002;54: 143-151.
- [In Persian]
- Bani Assadi S. Survey Effects of Deadwoods on avifaunal Richness and Abundance in northern Alborz: (case study : Kheirud Forest). MS.C. in Environmental Sciences, University of Tehran, 2011.p.122. [In Persian
- Alidadi F, Marvie Mohajer M. R, Etemad V, Sefidi K. Decay dynamics of oriental beech(Fagus orientalis)and hornbeam(Carpinus betuluc L.) deadwood in mixed beech stands. Iranian Journal of Forest and Poplar Research; 2014;22( 4): 624- 635 .[In Persian
- Poor Majidian M, Zahedi Amiri Gh, Jalilvand H,Mirdar Harijani M. Examine gaps on Natural Regeneration of Dead Trees IN not involved Beech( Case study: Jamand- Golbond).Iranian Journal of Science and Environmental Technology;2015; 17: 85- 94. [In Persian