نتایج جستجو برای: community size

تعداد نتایج: 906527  

2006
Ingvar Backéus Lennart Strömquist C. Ruffo

Tree vegetation and size structure was sampled in a miombo woodland area in E Tanzania and related to environmental factors, particularly soil and disturbance history. A total of 86 tree species was found. Four plant communities were distinguished through multivariate classification. Community 1 was dominated by Brachystegia boehmii, Brachystegia bussei and Julbernardia globiflora, and communit...

Background: Social responsiveness of the curriculum is aimed at directing all medical education activities to the training of physicians able to meet the health needs of the target community. Since medical education has moved towards a community-centered and community-based approach, significant attention has been paid to the concept of social responsiveness of medical education. Therefore, the...

Journal: :Global change biology 2017
James P W Robinson Ivor D Williams Andrew M Edwards Jana McPherson Lauren Yeager Laurent Vigliola Russell E Brainard Julia K Baum

Fishing pressure on coral reef ecosystems has been frequently linked to reductions of large fishes and reef fish biomass. Associated impacts on overall community structure are, however, less clear. In size-structured aquatic ecosystems, fishing impacts are commonly quantified using size spectra, which describe the distribution of individual body sizes within a community. We examined the size sp...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز 1390

learning a second or foreign language requires the manipulation of four main skills, namely, listening, reading, speaking, and writing which lead to effective communication. it is obvious that vocabulary is an indispensible part of any communication, so without a vocabulary, no meaningful communication can take place and meaningful communication relies heavily on vocabulary. one fundamental fac...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی - دانشکده علوم اجتماعی 1389

the study aims to achieve research and testing of hypotheses survey techniques and questionnaires to collect information used. 61 questions in the questionnaire included 15 questions and 46 open questions according to research in the study population, girls and their mothers as the value of different children investment should be. mothers according to the research community benefits from havi...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2015
Candan U Soykan Rebecca L Lewison

Marine protected areas (MPAs) are used to protect species, communities, and their associated habitats, among other goals. Measuring MPA efficacy can be challenging, however, particularly when considering responses at the community level. We gathered 36 abundance and 14 biomass data sets on fish assemblages and used meta-analysis to evaluate the ability of 22 distinct community diversity metrics...

2015
Esteban Acevedo-Trejos Gunnar Brandt Jorn Bruggeman Agostino Merico

The factors regulating phytoplankton community composition play a crucial role in structuring aquatic food webs. However, consensus is still lacking about the mechanisms underlying the observed biogeographical differences in cell size composition of phytoplankton communities. Here we use a trait-based model to disentangle these mechanisms in two contrasting regions of the Atlantic Ocean. In our...

2007
Jofre Carnicer Lluís Brotons Daniel Sol Pedro Jordano

Aim To consider the role of local colonization and extinction rates in explaining the generation and maintenance of species richness gradients at the regional scale. Location A Mediterranean biome (oak forests, deciduous forests, shrublands, pinewoods, firwoods, alpine heathlands, crops) in Catalonia, Spain. Methods We analysed the relative importance of direct and indirect effects of community...

2017
Bing Yang Xueyong Pang Bin Hu Weikai Bao Guanglong Tian

Although the effects of gap formation resulting from thinning on microclimate, plant generation and understory plant community have been well documented, the impact of thinning on soil microbial community and related ecological functions of forests particularly in subalpine coniferous region is largely unknown. Here, the effects of thinning on soil microbial abundance and community structure us...

2000
E. WILLIAM SCHWEIGER JAMES E. DIFFENDORFER ROBERT D. HOLT RAYMOND PIEROTTI MICHAEL S. GAINES

We compared the density and spatial distribution of four small mammal species (Microtus ochrogaster, Peromyscus maniculatus, Sigmodon hispidus, and P. leucopus) along with general measures of an old field plant community across two successional phases (1984–1986 and 1994–1996) of an experimental study of fragmentation in eastern Kansas. During the early phase the plant community was characteriz...

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