نتایج جستجو برای: habitat variables including elevation

تعداد نتایج: 1350684  

2014
Bronwyn Isaac John White Daniel Ierodiaconou Raylene Cooke

Arboreal marsupials play an essential role in ecosystem function including regulating insect and plant populations, facilitating pollen and seed dispersal and acting as a prey source for higher-order carnivores in Australian environments. Primarily, research has focused on their biology, ecology and response to disturbance in forested and urban environments. We used presence-only species distri...

Journal: :مرتع و آبخیزداری 0
مهسا قاضی مرادی کارشناس ارشد مرتعداری، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان مصطفی ترکش اصفهانی استادیار دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان حسین بشری استادیار دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان محمد رضا وهابی استادیار دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان

in this study, the ability of generalized additive model (gam) for mapping potential distribution of ferula ovina boiss, and the description of species response curves to environmental variables were examined in fereidonshar region with area of 1000 square kilometers located in west of isfahan province. the presence and absence data of the species were collected from 278 sites (including 138 pr...

Journal: :محیط زیست طبیعی 0
فاطمه بهادری خسروشاهی دانش آموخته کارشناسی ارشد، شرکت مهندسان مشاور آب و عمران فراز اندیش، ایران افشین علیزاده شعبانی استادیار دانشکده منابع طبیعی، دانشگاه تهران، ایران محمد کابلی استادیار دانشکده منابع طبیعی، دانشگاه تهران، ایران محمود کرمی استاد دانشکده منابع طبیعی، دانشگاه تهران، ایران پدرام عطارد استادیار دانشکده منابع طبیعی، دانشگاه تهران، ایران میترا شریعتی دانش آموخته کارشناسی ارشد، دانشکده منابع طبیعی، دانشگاه تهران، ایران

the aim of this study was to develop a methodology to identify suitable habitat of the eurasian nuthatch (sitta europea) at kheyrood forest, northern alborz, iran. this study was carried out during spring to summer 2008. with attention to the area and topographic condition of kheyrood forest, patom, namkhane, gorazbon, cheler and baharbon were selected as data collecting series. the present stu...

Changes in the geographical distribution of plants are one of the major impacts of the climate change. This study was aimed to predict the potential changes in the distribution of Artemisia aucheri Boiss in Isfahan rangelands. Therefore, six bioclimatic variables and two physiographic variables were used under the Generalized Linear Model (GLM), Flexible Denotative Analysis (FDA), Surface Range...

Journal: :PloS one 2016
Cintia Camila Silva Angelieri Christine Adams-Hosking Katia Maria Paschoaletto Micchi de Barros Ferraz Marcelo Pereira de Souza Clive Alexander McAlpine

A mosaic of intact native and human-modified vegetation use can provide important habitat for top predators such as the puma (Puma concolor), avoiding negative effects on other species and ecological processes due to cascade trophic interactions. This study investigates the effects of restoration scenarios on the puma's habitat suitability in the most developed Brazilian region (São Paulo State...

Journal: :Remote Sensing 2016
Samuel M. Jantz Lilian Pintea Janet Nackoney Matthew C. Hansen

All four chimpanzee sub-species populations are declining due to multiple factors including human-caused habitat loss. Effective conservation efforts are therefore needed to ensure their long-term survival. Habitat suitability models serve as useful tools for conservation planning by depicting relative environmental suitability in geographic space over time. Previous studies mapping chimpanzee ...

Journal: :Remote Sensing 2013
Li Shen Yuhong He Xulin Guo

The population of loggerhead shrike (Lanius ludovicianus excubutirudes) in Grassland National Park of Canada (GNPC) has undergone a severe decline due to habitat loss and limitation. Shrike habitat availability is highly impacted by the biophysical characteristics of grassland landscapes. This study was conducted in the west block of GNPC. The overall purpose was to extract important biophysica...

2015
Juan D Carvajal-Quintero Federico Escobar Fredy Alvarado Francisco A Villa-Navarro Úrsula Jaramillo-Villa Javier A Maldonado-Ocampo

Studies on elevation diversity gradients have covered a large number of taxa and regions throughout the world; however, studies of freshwater fish are scarce and restricted to examining their changes along a specific gradient. These studies have reported a monotonic decrease in species richness with increasing elevation, but ignore the high taxonomic differentiation of each headwater assemblage...

Journal: :caspian journal of environmental sciences 2013
k. sabetraftar r. zarkami r. sadeghi p. van damme

the genus azolla forms a group of small-leafed, floating aquatic ferns native to the tropics, subtropics, and warm temperate regions of africa, asia, and america. for several decades, these ferns have been utilized for various purposes: e.g. as green manure, feed for animals, but also for the removal of different metals (e.g. hg, pb, cr and cd) through wastewater treatment or for elimination of...

2016
Wen Wu Yuehui Li Yuanman Hu

Background. Understanding species distribution, especially areas of overlapping habitat between sympatric species, is essential for informing conservation through natural habitat protection. New protection strategies should simultaneously consider conservation efforts for multiple species that exist within the same landscape, which requires studies that include habitat overlap analysis. Methods...

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