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Mapping the habitat suitability of Ottelia species in Africa

Plant Diversity 2022年第5期44卷 468-480页

作者： Boniface K.Ngarega John M.Nzei Josphat K.Saina marwa waseem A.halmy Jin-Ming Chen Zhi-Zhong Li Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical GardenChinese Academy of SciencesWuhan430074China Center of Conservation Biology Core Botanical GardensChinese Academy of SciencesWuhan430074China University of Chinese Academy of Sciences Beijing100049China Center for Integrative Conservation Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglun666303China Department of Environmental Sciences Faculty of ScienceAlexandria UniversityAlexandria21511Egypt

Understanding the influence of environmental covariates on plant distribution is critical,especially for aquatic plant *** change is likely to alter the distribution of aquatic ***,knowledge of this change on the burden of aquatic macroorganisms is often fraught with ***,a model genus for studying the evolution of the aquatic family Hydrocharitaceae,is mainly distributed in slow-flowing creeks,rivers,or lakes throughout pantropical regions in the *** to recent rapid climate changes,natural Ottelia populations have declined *** modeling the effects of climate change on the distribution of Ottelia species and assessing the degree of niche similarity,we sought to identify high suitability regions and help formulate conservation *** models use known background points to determine how environmental covariates vary spatially and produce continental maps of the distribution of the Ottelia species in ***,we estimated the possible influences of the optimistic and extreme pessimistic representative concentration pathways scenarios RCP 4.5 and RCP 8.5 for the *** results show that the distinct distribution patterns of studied Ottelia species were influenced by topography(elevation)and climate(e.g.,mean temperature of driest quarter,annual precipitation,and precipitation of the driest month).While there is a lack of accord in defining the limiting factors for the distribution of Ottelia species,it is clear that water-temperature conditions have promising effects when kept within optimal *** also note that climate change will impact Ottelia by accelerating fragmentation and habitat *** assessment of niche overlap revealed that Ottelia cylindrica and *** had slightly more similar niches than the other Ottelia *** present findings identify the need to enhance conservation efforts to safeguard natural Ottelia populations and provide a theoretical basis for the distr

关键词： African freshwater bodies Climate change Ecological niche modeling Habitat suitability Niche overlap

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Monitoring the impact of climate change and human activities on grassland vegetation dynamics in the northeastern Qinghai-Tibet Plateau of China during 2000–2015

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Journal of Arid Land 2019年第5期11卷 637-651页

作者： XIONG Qinli XIAO Yang marwa waseem a halmy Mohammed A DAKHIL LIANG Pinghan LIU Chenggang ZHANG Lin Bikram PANDEY PAN Kaiwen Sameh B EL KAFRAWAY CHEN Jun CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041China College of Biology and Environmental Sciences Jishou UniversityJishou 416000China Department of Environmental Science Faculty of ScienceAlexandria UniversityAlexandria 21511Egypt University of Chinese Academy of Sciences Beijing 100039China Botany and Microbiology Department Faculty of ScienceHelwan UniversityCairo 11790Egypt School of Government Sun Yat-sen UniversityGuangzhou 510275China CAS Key Laboratory of Tropical Plant Resources and Sustainable Use Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglun 666303China National Authority for Remote Sensing and Space Sciences Cairo 11790Egypt

Climate change and human activities can influence vegetation net primary productivity(NPP), a key component of natural ecosystems. The Qinghai-Tibet Plateau of China, in spite of its significant natural and cultural values, is one of the most susceptible regions to climate change and human disturbances in the world. To assess the impact of climate change and human activities on vegetation dynamics in the grassland ecosystems of the northeastern Qinghai-Tibet Plateau, we applied a time-series trend analysis to normalized difference vegetation index(NDVI) datasets from 2000 to 2015 and compared these spatiotemporal variations with trends in climatic variables over the same time period. The constrained ordination approach(redundancy analysis) was used to determine which climatic variables or human-related factors mostly influenced the variation of NDVI. Furthermore, in order to determine whether current conservation measures and programs are effective in ecological protection and reconstruction, we divided the northeastern Qinghai-Tibet Plateau into two parts: the Three-River Headwater conservation area(TRH zone) in the south and the non-conservation area(NTRH zone) in the north. The results indicated an overall(73.32%) increasing trend of vegetation NPP in grasslands throughout the study area. During the period 2000–2015, NDVI in the TRH and NTRH zones increased at the rates of 0.0015/a and 0.0020/a, respectively. Specifically, precipitation accounted for 9.2% of the total variation in NDVI, while temperature accounted for 13.4%. In addition, variation in vegetation NPP of grasslands responded not only to long-and short-term changes in climate, as conceptualized in non-equilibrium theory, but also to the impact of human activities and their associated perturbations. The redundancy analysis successfully separated the relative contributions of climate change and human activities, of which village population and agricultural gross domestic product were the two most impor

关键词： climate change human activities NDVI variation Qinghai-Tibet Plateau redundancy analysis vegetation net primary productivity

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