Hamid Ejtehadi

Hamid Ejtehadi
Ferdowsi University Of Mashhad | FUM · Department of Biology

Professor
Biodiversity

About

89
Publications
30,616
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1,021
Citations

Publications

Publications (89)
Article
Full-text available
Piptatherum ferganense is recorded as a new grass species for the flora of Iran collected from Ghorkhod Protected Area and Aladagh Mountains in North Khorassan province. The core distribution range of the species is Eastern Irano-Turanian with a disjunction in northeastern Iran. The morphological characters of P. ferganense are illustrated and comp...
Article
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Climate and soil factors induce substantial controls over plant biodiversity in stressful ecosystems. Despite of some studies on plant biodiversity in extreme ecosystems including rocky outcrops, simultaneous effects of climate and soil factors have rarely been studied on different facets of biodiversity including taxonomic and functional diversity...
Article
Ferula microcolea (Boiss.) Boiss. is an endemic plant in Iran that some of its habitats have been destroyed in recent decades. Since the bioclimatic variables which determine its potential distribution, are poorly defined, a specific analysis is needed. In this study, the species distribution modelling was used for reaching these goals: (i) identif...
Article
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Abstract Aim Plant–plant interactions are an important factor in structuring plant biodiversity. However, most studies on the impacts of plant–plant interactions on biodiversity focus on species richness and to a lesser extent on other facets of diversity. When other facets of biodiversity are considered, studies often include a limited set of envi...
Article
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Recreational activities worldwide have major impacts on the environment. This study examined the impact of different kinds of recreational activities on plant communities in a highly visited park in Mashhad, Iran. Vegetation in the park was sampled along 41 random 10-m transects with different human disturbances (trails, dirt roads, campsites) and...
Article
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Campanula oreodoxa (Campanulaceae) is described and illustrated as a new sub-alpine species from North Khorassan province, Iran. The new species belongs to C. sect. Oreocodon based on dehiscence of the capsules with three middle pores at the base and absence of appendages between the calyx lobes. It is compared morphologically with the closely rela...
Article
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The interspecific plant interactions along grazing and aridity stress gradients represent a major research issue in plant ecology. However, the combined effects of these two factors on plant-plant interactions have been poorly studied in the northeast of Iran. To fill this knowledge gap, 144 plots were established in 12 study sites with different g...
Article
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Aims Understanding fine-grain diversity patterns across large spatial extents is fundamental for macroecological research and biodiversity conservation. Using the GrassPlot database, we provide benchmarks of fine-grain richness values of Palaearctic open habitats for vascular plants, bryophytes, lichens and complete vegetation (i.e., the sum of the...
Preprint
Aridity and intensive grazing have been confirmed to affect the facilitative effects of dryland shrubs. However, their combined effects on plant-plant interactions have rarely been tested. To test how these two factors affect relations between plants, we analyzed 144 plots (under shrub canopy vs. open areas) at 12 sampling areas established in the...
Article
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In grazing conditions, unpalatable species may induce either associational defense or neighbor contrast susceptibility in neighboring communities. Using surveys from eight grasslands, we tested whether various unpalatable species have the same impacts on neighboring communities in response to grazing. The studied unpalatable species were: Phlomis c...
Article
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Endemic plants of the Khorassan-Kopet Dagh (KK) floristic province in northeastern Iran, southern Turkmenistan, and northwestern Afghanistan are often rare and range-restricted. Because of these ranges, plants in the KK are vulnerable to the effects of climate change. Species distribution modelling (SDM) can be used to assess the vulnerability of s...
Preprint
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Research in environmental science relies heavily on global climatic grids derived from estimates of air temperature at around 2 meter above ground1-3. These climatic grids however fail to reflect conditions near and below the soil surface, where critical ecosystem functions such as soil carbon storage are controlled and most biodiversity resides4-8...
Article
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Overgrazing affects plant communities, and is a significant disturbance factor in arid and semi-arid regions. The immediate changes of plant communities after overgrazing in the disturbed arid ecosystems of Iran have been poorly studied. We recorded data from 100 random samples before and after overgrazing in the Golbahar plain located in the north...
Article
Phelipanche pouyanii is described here as a new species from South Khorassan Province, East of Iran. Its diagnostic morphological features are the calyx teeth being far longer than the calyx tube and staminal filaments being glabrous. These characters clearly differentiated the new species from its closely related taxa, i.e., P. mutelii, P. anguste...
Article
The Hezar-Masjed Mountain range is one of the main highlands of the northeasten Iran. The vegetation of its upper elevations has been poorly studied. This study aimed to compare the plant biodiversity of different aspects of the Hezar-Masjed Summit. A total number of 139 random 1x1m plots were recorded from different aspects of the study area. In e...
Article
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Endemic and restricted-range species are considered to be particularly vulnerable to the effects of environmental change, which makes assessing likely climate change effects on geographic distributions of such species important to the development of integrated conservation strategies. Here, we determined distributional patterns for an endemic speci...
Article
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Endemic species are believed to converge on narrow ranges of traits, with rarity reflecting adaptation to specific environmental regimes. We hypothesized that endemism is characterized by limited trait variability and environmental tolerances in two Dianthus species (Dianthus pseudocrinitus and Dianthus polylepis) endemic to the montane steppes of...
Article
Questions (i) Do patterns of species diversity and composition differ between the plots exposed to high versus low grazing intensity? (ii) Do these differences vary among three regions with different climate, representing the gradient from the arid to sub‐humid conditions? Location northeastern Iran Methods We compared plots intensively grazed by...
Article
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Aims: Classification is an appropriate tool for the summarizing of species data in community ecology. Researchers need to select the effective classification method(s) and the optimum number of clusters to perform a reasonable classification. The aims of the present research are to assess the efficacy of various classification algorithms and to sel...
Article
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Researches related to invasive plant ecology has recently increased, hence the terminology used in the early studies can later be perused by other researchers. Incorrect use of the term "invasive species" instead of "non-invasive species" may lead to environmental consequences and threatens the biodiversity and life of endangered species. Therefore...
Article
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Plant traits—the morphological, anatomical, physiological, biochemical and phenological characteristics of plants—determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research sp...
Article
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Stipa richteriana and Galium songaricum are newly recorded species for the flora of Iran, collected from Binalood and Hezar-Masjed Mountains in Razavi Khorassan Province. The geographical distribution of both species is mainly confined to the Middle Asia. Morphological characters of two newly recorded species are compared with their close relatives...
Article
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The study of local and regional mechanisms driving spatial patterns in beta diversity is essential to the understanding of biodiversity. We aimed to predict the roles of multiple mechanisms operating at regional to fine spatial scales in structuring the beta diversity in a mountainous semi-arid rangeland of the Khorassan-Kopet Dagh floristic provin...
Article
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It is well-known that pistes have adverse effects on alpine ecosystems. Previous studies urged that pistes should be installed and managed in the ways to minimize negative impacts on natural habitats. However, the impacts of this type of management on the plant communities are not widely studied. The aim of this study was to examine species composi...
Article
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Understanding the responses of vegetation characteristics and soil properties to grazing in different precipitation regimes is useful for the management of rangelands, especially in the arid regions. In northeastern Iran, we studied the responses of vegetation to livestock grazing in three regions with different climates: arid, semiarid, and subhum...
Article
Various disturbances affect the vegetation in rural areas. However, the responses of plant communities to multiple disturbances have rarely been studied. We investigated the vegetation of a rural landscape in northeast Iran. We established 42 study sites in three land use types using a stratified‐random design: ungrazed abandoned croplands (UACs),...
Article
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Molecular phylogenies are increasingly used to understand how biotic interactions and environment shape phylogenetic community structure (PCS). However, we do not understand the effects of plant–plant interactions and environment on PCS and phylogenetic diversity across spatial scales, particularly in rangelands. Here, we ask: (1) do plant–plant in...
Article
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In this study, the Qalajeh protected area in the Kermanshah Province (Iran) was investigated for its plant associations. Based on the map of the region, areas of natural and semi-natural habitats were initially separated from inhabited, farms and disturbed areas, in which 98 releves were stablished. Vegetation data were collected using the Braun-Bl...
Article
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The mechanisms determining community phylogenetic structure range from local ecological mechanisms to broad biogeographical processes. How these community assembly processes determine phylogenetic structure and patterns in rangeland communities across multiple spatial scales is still poorly understood. We sought to determine whether the structure o...
Article
Heydari Wildlife Refuge (HWR) is located in Binalood mountain range of the Razavi Khorassan Province in Northeastern Iran. The area belongs to the central part of Khorassan-Kopet Dagh floristic province, which is a transitional zone between different phytogeographical units in the Irano-Turanian region. We investigated the floristic composition, li...
Article
Achillea eriophora D.C. (Asteraceae), an endemic species in Iran, is used extensively in Iranian folk medicine to treat various ailments, including gastrointestinal disorders, skin inflammations and wound healing. The present study was aimed to investigate the effects of the methanolic extract of A. eriophora leaves on the stimulation of human fibr...
Article
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Characterizing traits of a species in its habitat is substantial for planning a practical conservation program. Acanthophyllum ejtehadii Mahmoudi & Vaezi (Caryophyllaceae) is a recently established endemic species for flora of Iran and has a narrow non-conserved natural habitat in Radkan region of Chenaran, Razavi Khorasan Province. The soil and cl...
Article
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Objective: Achillea is a traditional medicinal herb which contains different phenol and flavonoid compounds that are responsible for Achillea pharmacological effects. We aimed to determine phenol and flavonoid contents, besides antioxidant activities of different extracts from Achillea eriophoraa (A. eriophora) DC. and Achillea biebersteinii (A. b...
Article
Classification of Ecological Species Groups (ESG) in plant community analysis is one method to describe vegetation and relating them to environmental factors. This study was conducted to recognize ESG and their relationships with some environmental factors in Chamanbid-Jozak protected area from 2014 to 2016. This area is located in the eastern part...
Article
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Abstract Introduction: Study of functional and species diversity plays an important role in recognizing ecosystem function and services and is shown the type of response to environmental changes. Functional diversity refers to range and values of organism traits that affects ecosystems properties and is introduced in various ways such as number and...
Article
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Barbarea integrifolia (Brassicaceae) was collected during Khersan glacier studies around seasonal spring in south Alam-Kuh Mountain. Taxonomic remarks with distribution notes for the species and identification key for the Iranian Barbarea species are provided.
Poster
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Three different distribution patterns are uniform with statistically normal distribution, random with statistically poisson distribution and clumped with statistically negative binomial distribution have been introduced for plant species. In this study, four plant community models, with 5 species in 13 plots, with clumped, random, uniform distribut...
Article
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Ferula xylorhachis Rech.f. is an endemic plant species belonging to the Apiaceae family and distributed in northeastern Iran. In the present study, we attempted to determine the factors with the greatest effects on the distribution of this species and to determine suitable regions for it based on current and future conditions. The Maximum Entropy m...
Article
Aims Species composition and diversity of the mountainous rangelands are results of interactions between environmental severities, heterogeneous topography and facilitative effects by nurse plants. This research was aimed to compare relative effects of these three environmental variables on the natural vegetation of a mountainous rangeland. For a m...
Article
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During past few decades, worldwide various ecological alterations have been experienced after treat and decreasing of glaciers. Notable changes have been traced in Khersan glacier, Central Alborz of Iran by monitoring since 2013 to 2015. According to our studies, Khersan glacier surface reduced since 1991 and this significant reduction led to many...
Article
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Extensive investigation in subnival-nival area around Khersan glacier moraine introduced 71 vascular plant species. From this list 43 species have been listed in Noroozi (2001) in “ subnival-nival vascular plant species of Iran : a unique high mountain flora and its threat from climate warming ” and the others are new for subnival- nival area of Ir...
Article
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A complete, up to date checklist of Alyssum species reported from Iran is presented in this review. The distribution of these species was considered in Iran and in the adjacent countries, too. Additional records were obtained from Flora Iranica, Flora of Turkey and other references. In Iran some species (e. g., Alyssum hezarmasjedensis, A. mozaffar...
Article
Due to importance of considerable effects of ecotourism on environment, the effect of ecotourism on plant biodiversity in Cherlagh zone was investigated .To acquire the aim of the article, the sampling area was selected under the condition that the ecotourism is solely the variable factor and the slope, direction and height are considered constant...
Article
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In this study, taxonomic relationship of some Iranian species of Alyssum sect. Gamosepalums was explored in terms of anatomical aspects. Transversal sections of peduncle belonging to 8 species of Alyssum sect. Gamosepalum have studied by qualitative and quantitative characters. The vascular bundle type was bicollateral in all species. In sum, anato...
Data
Cluster analysis and principal component analysis were used to investigate the differences among species of Acanthophyllum sect. Oligosperma in Khorassan provinces (NE Iran). In this study, a total of 60 including 32 quantitatives and 28 qualitatives characters were examined on 98 herbarium specimens. The results explained morphological treats are...
Article
In order to examine the systematic application of seed-coat characters in Erysimum (Brassicaceae) distributed in Northeast of Iran (Khorassan provinces), the seeds of nine species (14 populations) were examined using the light microscope (LM) and the scanning electron microscope (SEM). According to results of the LM, diagnostic characters at the sp...
Article
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“Helali protected area” has been officially announced as a no-hunting zone since 1997 and then, became a protected area in 2006. This area with ca. 63495 hectares, is located in the west of Gonabad and southeast of Bajestan, Khorasan-e Razavi province. The area includes mountains, plains and foothills and has a dry and desert climate with warm summ...