9685

8929

كارشناسي ارشد

مرتعداري

اصفهان: دانشگاه صنعتي اصفهان، دانشكده منابع طبيعي

1393

دوازده،89ص.: مصور،جدول،نمودار﴿رنگي﴾

ص.ع.به فارسي و انگليسي

محمدرضا وهابي، محمودرضا همامي

محمدتقي فيضي

93/12/23

مصطفي تركش اصفهاني، حسين بشري

مهندسي منابع طبيعي

ID8929

Seed Dispersal by small and larg Herbivores ant and Persian gazelle in Kolah Qazi National Park Zahra Jamali 2 12 2014 z jamali@na iut ac ir Department of Natural Resources Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiAbstractAlteration of arid lands vegetation may lead to constant changes in the soil in a way thatfor many years can not be returned to its original condition Reproductive succsess anddispersal of plants to a high extent depends on their ability for seed dispersal Myrmecochory is an important factor in determining the distribution composition andspecies diversity of vegetation communities particularly in arid land ecosystems Westudied the potential seed dispersal by harvester ants Messor spp and Persian gazelle Gazella subgutturosa in Kolah Qazi National Park central Iran The study conducted forsix months April May June July October November in 2013 In each month 30 antnests where no gazelle dung was around it and 30 ant nests where gazelle dungs weredetected on them were randomly selected across the study area From each ant nest a soilsample with a depth of 5 cm was taken 60 habitat sites including 30 independent replicatesfor ant nest with gazelle dung and 30 independent replicates for ant nest without gazelledung were selected Samples were dried in a dark room by exposing to open air and thenfrom each a sample was taken and kept in refrigerator for two months for cold stratificationtreatment Seed content of dung samples were determined in greenhouse germinationexperiments over a period of 8 months In total 124037 seedlings from 63 plant speciesand 21 families were germinated from ant nest soil samples Of these 52 species wereforb 9 species were grass and 2 species were shrub Although the species richness ofgrasses were low but they constituted about 52 of the total germinated seeds In May June and July the density and richness of seeds were higher in ant nest sites withoutgazelle dung In contrast in April September and Octoberthe density and richness of seedswere higher in ant nest sites with gazelle dung Seedlings grown from soil samples of antnests with gazelle dung showed higher species richness while those resulted from soilsamples of ant nests without gazelle dung had higher species density The ant nests weredivided into four groups based on their seed species richness as resulted from principalcomponent analysis and cluster analysis while the months located into three clusters Apriland May June and July and September and October Given that most of plant speciesrecorded in the park regenerate by seeds and that seeds of different plant species dispersedby harvester ants mirmecochory may play an important role in vegetation dynamics andconservation of semi arid steppe rangelands Keywords Seed germination experiment harvester ants ant nests seed content aridecosystems

محمدرضا وهابي، محمودرضا همامي

محمدتقي فيضي

مصطفي تركش اصفهاني، حسين بشري