نتایج جستجو برای: ecological conditions
تعداد نتایج: 935412 فیلتر نتایج به سال:
Paper presents scientometry as a science and a fundamental instrument for determining the international value of an university as well as for the statistical evaluation of scientific research results. The impact of the research measurable through scientometric indicators is analyzed. Promoting the scientific production of universities through institutional digital repositories deals with the co...
the present work was carried out to investigate first, the ecology of the sepedon flies as well as speciesof lymnea snails and secondly, the biological effects of sepedon fly larvae living on lymnea. in this regard,the life cycle, death rate and compatibility of lymnea species, as well as the life cycle of sepedon flies inbreeding cage and the activity of the new larvae in the same ecological c...
The present work was carried out to investigate first, the ecology of the Sepedon flies as well as speciesof Lymnea snails and secondly, the biological effects of Sepedon fly larvae living on Lymnea. In this regard,the life cycle, death rate and compatibility of Lymnea species, as well as the life cycle of Sepedon flies inbreeding cage and the activity of the new larvae in the same ecological c...
The process of learning in social-ecological systems is an emerging area of research, but little attention has been given to how social and ecological interactions motivate or inhibit learning. This is highly relevant to the South African water sector, where a major policy transition is occurring that provides local water users and managers with new opportunities to engage in adaptive learning ...
background: the survey for the prevalence of different species of cattle hyalomma ticks was carried out in three districts (rawalpindi, multan and lahore) of punjab province in pakistan. the bionomical conditions suitable for hyalomma were also studied in laboratory. methods: one hundred specimens of ticks of different genera were collected from each district. after identification, the hyalomm...
In any population in which resources are limiting, the allocation of resources toward increased reproductive success may generate costs to survival [1-8]. The relationship between a sexually selected trait and fitness will therefore represent a balance between its relative associations with fecundity versus viability [3, 6, 7]. Because the risk of mortality in a population is likely to be heavi...
Domesticated and growth hormone (GH) transgenic salmon provide an interesting model to compare effects of selected versus engineered phenotypic change on relative fitness in an ecological context. Phenotype in domestication is altered via polygenic selection of traits over multiple generations, whereas in transgenesis is altered by a single locus in one generation. These established and emergin...
When local resource users detect, understand, and respond to environmental change they can more effectively manage environmental resources. This article assesses these abilities among artisanal fishers in Roviana Lagoon, Solomon Islands. In a comparison of two villages, it documents local resource users' abilities to monitor long-term ecological change occurring to seagrass meadows near their c...
the effect of soil and topographic features on distribution of amygdalus scoparia in nehbandan (iran) was investigated. slope, aspect and altitudinal maps were overlaid to prepare a working map unit. quantitative and qualitative traits, including height, number, collar diameter of sprout with the highest diameter, crown diameter and trunk health were recorded in 1000 m2 plots (27 plots). in eac...
The validity of ecological studies in epidemiology for inferring causal relationships has been widely challenged as observed associations could be biased by the Ecological Fallacy. We reconsider the important design components of ecological studies, and discuss the conditions that may lead to spurious associations. Ecological associations are useful and valid when the ecological exposures can b...
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