检索结果-南通市图书馆

Distribution, habitat and adaptability of the genus Tapirus

Integrative Zoology 2012年第4期7卷 346-355页

作者： Manolo J.GARCÍA Emília Patrícia MEDICI, Eduardo J.NARANJO Wilson NOVARINO Raquel S.LEONARDO conservationist research center San Carlos UniversityGuatemala CityGuatemala Institute for Ecological research Campo GrandeBrazil El Colegio de la Frontera Sur ChiapasMexico Biology Department Andalas UniversityWest SumatraIndonesia Defensores de la Naturaleza Foundation Guatemala CityGuatemala

In this manuscript,as a starting point,the ancient and current distribution of the genus Tapirus are summarized,from its origins,apparently in Europe,to current ranges.Subsequently,original and current tapir habitats are de-scribed,as well as changes in ancient habitats.As the manuscript goes on,we examine the ways in which tapir species interact with their habitats and the main aspects of habitat use,spatial ecology and adaptability.Having reviewed the historic and current distribution of tapirs,as well as their use and selection of habitats,we intro-duce the concept of adaptability,considering that some of the tapir physiological characteristics and behavior-al strategies can reduce the negative impact of habitat alteration and climate change.Finally,we provide rec-ommendations for future research priorities.The conservation community is still missing important pieces of information for the effective conservation of tapirs and their remaining habitats in Central and South America and Southeast Asia.Reconstructing how tapir species reached their current distribution ranges,interpreting how they interact with their habitats and gathering information regarding the strategies they use to cope with habitat changes will increase our understanding about these animals and contribute to the development of conservation strategies.

关键词： adaptability climate change distribution habitat Tapirus

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Community Development in a Dryland CREP in Northeastern Oregon

引用

American Journal of Plant Sciences 2011年第6期2卷 744-752页

作者： John D. Williams Heidi M. Hartman Lori M. Spencer James O. Loiland USDA Agricultural research Service Columbia Plateau Conservation Research Center Pendleton USA Umatilla Soil & Water Conservation District Pendleton USA Department Environmental Science and Regional Planning Washington State University Tri-Cities Richland USA District conservationist (USDA-NRCS) Dillingham Field Office Dillingham USA

Riparian areas in dryland crop regions of the Intermountain Pacific Northwest have largely been converted to cropland or pasture during the last 140 years. Some formerly cultivated floodplains have become difficult to farm;enrollment of these lands into conservation programs provides the opportunity to use them as wildlife habitat and as buffer areas near streams. Our objective was to evaluate plant community development on an USDA Conservation Reserve Enhan- cement Program site in northeastern Oregon from when the plant was planted in 1999 through 2008. The research was designed as a descriptive study. We established permanent line-transects to quantify vegetation establishment and changes in species composition through time. We collected data in 2000-2001 and 2007-2008. Vegetation cover in 2000-2001 was 100%, dominated by tall wheatgrass. Living plant material cover decreased from 98% in 2000-2001 to 33% in 2007 and 68% in 2008;dead plant residue significantly increased and tall wheatgrass cover decreased. Native species were present in similar percentages from 2000 to 2008, although there was a shift from target to nontarget species. The 1999 seeding can be judged a success because of the ground cover provided and the establishment of one target species, tall wheatgrass. However, the increased ratio of dead to living plant material and shift to non-target annual weed species suggests that more active management (i.e., fire, grazing, or mowing) of the tall wheatgrass stand is needed to maintain its productivity and/or a healthy mix of multiple species.

关键词： Conservation Buffers Riparian Management Weed Control Plant Community

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Quantifying the spatial and temporal distribution of tanglehead (Heteropogon contortus) on South Texas rangelands

引用

Ecological Processes 2018年第1期7卷 14-22页

作者： Jose M.Mata Humberto L.Perotto-Baldivieso Fidel Hernández Eric D.Grahmann Sandra Rideout-Hanzak John T.Edwards Michael T.Page Taylor M.Shedd Caesar Kleberg Wildlife research Institute Texas A&M University-Kingsville700 University Blvd.MSC 218KingsvilleTX 78363USA

Introduction:Tanglehead is a grass native to southwestern US rangelands;however,its prevalence as a native invasive on South Texas rangelands has increased rapidly during the last decade.Large areas of monotypic stands have emerged in Jim Hogg,Duval,Brooks,and Kleberg counties.The aim of this research is to understand the spatial and temporal dynamics of these invasions as a model for the assessment of native invasive species.Our specific objectives were to(1)evaluate the feasibility of classifying tanglehead using 1-m resolution imagery data,(2)assess the spatial and temporal distribution of tanglehead in relation to soil type and distance from roads,and(3)quantify the temporal and spatial distribution of tanglehead on our study sites.We combined remote sensing approaches with landscape metrics to quantify the spatial and temporal distribution of tanglehead in five locations across our study area.We calculated the normalized difference vegetation index and combined it with the original aerial imagery to conduct an unsupervised classification with the following land cover classes:woody vegetation,tanglehead,non-tanglehead herbaceous,and bare ground.Soil type and the distance from roads were assessed to determine the relationship between these factors and tanglehead spatial distribution.Results:We were able to successfully map tanglehead using the 1-m imagery.Our image classification approach resulted in accuracies greater than 85%for all sites.Tanglehead occurred in sandy,loamy sand,and sandy loam soils.Over 70% of tanglehead cover occurred within the first 150 m from the edge of roads.This cover increased from 7.1%(SE=1.1%)in 2008 to 17.8%(SE=5.4%)in 2014.Once established,small patches of tanglehead began aggregating or coalescing with existing stands,thereby creating larger patches over larger areas.Conclusions:Our study has shown the value of analyzing spatiotemporal dynamics of tanglehead with remote sensing techniques and landscape metrics to improve our understanding of establishment and dispersal processes

关键词： distribution landscape sandy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：