نتایج جستجو برای: richness

تعداد نتایج: 20745  

A standardized sampling technique for measuring plant diversity is needed to assist in resource inventories and for monitoring long-term trends in vascular plant species richness.With considering to the estimated richness amount (via different methods) are changing influenced by interaction of plot distance and shape, and also, presenting of a plot design (that can be near to reality) is import...

2013
Timothy A. Schetter Timothy L. Walters Karen V. Root

Impacts of human land use pose an increasing threat to global biodiversity. Resource managers must respond rapidly to this threat by assessing existing natural areas and prioritizing conservation actions across multiple spatial scales. Plant species richness is a useful measure of biodiversity but typically can only be evaluated on small portions of a given landscape. Modeling relationships bet...

Journal: :journal of rangeland science 2013
ali mahdavi javad eshaghi rad mojtaba jamshidifard

recognizing the herbaceous plant species diversity could use as an importantindicator applied for the rangeland and forests management. considering the presence ofvegetation and animal husbandry in zagros region, iran, being aware of the diversity andrichness of plant species is necessary to management or the destructed vegetationrestoration. in order to study the effect of aspect and elevation...

Journal: :SAGE Open Nursing 2017

Journal: :Communicative & Integrative Biology 2011

Journal: :Nature Ecology & Evolution 2019

2017
Rodrigo B. Ferreira Karen H. Beard Stephen L. Peterson Sharon A. Poessel Colin M. Callahan

Darwin proposed two contradictory hypotheses to explain the influence of congeners on the outcomes of invasion: the naturalization hypothesis, which predicts a negative relationship between the presence of congeners and invasion success, and the pre-adaptation hypothesis, which predicts a positive relationship between the presence of congeners and invasion success. Studies testing these hypothe...

2008
JENNY DAVIS JENNY DAY RICARDO FIGUEROA VINCENT H. RESH

NÚRIA BONADA* , MARIA RIERADEVALL* , HELEN DALLAS , JENNY DAVIS , JENNY DAY , RICARDO FIGUEROA § , VINCENT H. RESH AND NARCÍS PRAT* *Department of Ecology, University of Barcelona, Barcelona, Spain Department of Zoology, University of Cape Town, Cape Town, South Africa Aquatic Ecosystems Research Group, Murdoch University, Murdoch, Western Australia Aquatic Systems Research Unit, Environmental ...

2017
Devdutt Kulkarni Frederik De Laender

Food web structure and species richness are both subject to biotic (e.g. predation pressure and resource limitation) and abiotic stress (e.g. environmental change). We investigated the combined effects of both types of stress on richness and connectance, and on their relationship, in a predator-prey system. To this end, we developed a mathematical two trophic level food-web model to investigate...

Journal: :بوم شناسی کشاورزی 0
اشکان عسگری کورس خوشبخت سعید صوفی زاده جعفر کامبوزیا

evaluation diversity of agricultural plants and effectiveness of management factors in non-hunting of gharaviz abstract biodiversity is the basis of agriculture. sustainable agriculture both promotes and is enhanced by biodiversity. during present study, agrobiodiversity and management factors were investigated in three villages of gharaviz area and four villages in surroundings area, in sarpol...

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