نتایج جستجو برای: indicator species

تعداد نتایج: 618489  

2012
Aaron M. ELLISON Florian M. Steiner Aaron M. Ellison

I review the distribution of ant genera in cold biomes of the northern hemisphere, and discuss opportunities and challenges in using ants as environmental, ecological, and biodiversity indicators in these biomes. I present five propositions that, if supported with future research, would allow ants to be used as biological indicators in north-temperate cold biomes: (1) Distribution of individual...

2016
Dong-Hwan Kim Tae-Soo Chon Sang-Bin Lee Young-Seuk Park

Benthic macroinvertebrates were collected from streams located in an urban area from regions featuring different environmental conditions. Physicochemical variables and land use types pertaining to sampling sites were analyzed concurrently. Multivariate analyses (cluster analysis and non-metric multidimensional scaling) and rank-abundance diagrams were used to characterize community patterns to...

2016
Edwin C Rowe Adriana E S Ford Simon M Smart Peter A Henrys Mike R Ashmore

Atmospheric nitrogen (N) deposition has had detrimental effects on species composition in a range of sensitive habitats, although N deposition can also increase agricultural productivity and carbon storage, and favours a few species considered of importance for conservation. Conservation targets are multiple, and increasingly incorporate services derived from nature as well as concepts of intri...

2016
Chong Wei Ying

The aims of this paper are to determine the reliability and validity of Entrepreneurial Attitude Orientation (EAO) scale as an instrument to measure the entrepreneurial attitudes among business students of higher education institutes of Malaysia. Initially, the EAO scale consisted of 75 items concerning 4 conceptual subscales: achievement in business (23 items), perceived personal control of bu...

2016
Ryan Allan Johnson Marc A. Linderman RYAN ALLAN JOHNSON Heather Sander

Ecological indicators, historical land use, and invasive species detection in the lower Iowa River floodplain." MA has been approved by the Examining Committee for the thesis requirement for the Master of Arts degree in Geography at the May 2014 graduation.

Journal: :J. Informetrics 2013
Ludo Waltman Nees Jan van Eck

We address the question how citation-based bibliometric indicators can best be normalized to ensure fair comparisons between publications from different scientific fields and different years. In a systematic large-scale empirical analysis, we compare a traditional normalization approach based on a field classification system with three source normalization approaches. We pay special attention t...

2014
George A. Meindl Daniel J. Bain Tia-Lynn Ashman

Serpentine soils are edaphically stressful environments that host many endemic plant species. In particular, serpentine soils are high in several heavy metals (e.g. nickel, cobalt and chromium) and these high heavy metal concentrations are thought, in part, to lead to varying levels of plant adaptation and soil affinities (i.e. endemic vs. non-endemic plant species). It is unclear, however, whe...

2013
James Thurlow Channing Arndt M. Azhar Hussain Vincenzo Salvucci Finn Tarp Lars P. Østerdal

The poverty mapping methodology for estimating welfare rankings from small areas has proven to be useful in guiding allocation of government funds, regional planning, and general policy formulation. Nevertheless, poverty mapping also suffers from a series of by now well recognized shortcomings. We apply an approach based on first order dominance (FOD) to small area estimation. Five advantages t...

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