نتایج جستجو برای: have variable ecosystems
تعداد نتایج: 3135311 فیلتر نتایج به سال:
This investigation was conducted to study of diversity and distinction of Garra rufa in some aquatic ecosystems located in Fars province. So, 208 samples were collected from five aquatic ecosystems located in Fars province (Rudbal river, Babasheikh Khalil subterranean, Qaderabad subterranean, Doudabad subterranean, Khargheh river) and 24 morphological traits were measured. Before data analysis,...
Land use/cover change is one of the main factors in environmental changes. The changes directly affect the value of ecosystem services. The purpose of this research is to evaluate the effect of land use/land cover change in the Kashkan area on its ecosystem services. This research was carried out in three stages, including the analysis of land cover changes, prediction of changes, and carbon st...
The aim of this paper is to integrate the concept of co-creation of value with digital ecosystems and propose the impact of this integration on aspects of firm performance. The focus of the paper is on platforms that exist within digital ecosystems and the consumer-firm interaction under co-creation of value. Digital ecosystems are divided into four types of platform ecosystems based on the und...
Terrestrial ecosystems that were rare before human colonisation of New Zealand often have highly specialised and diverse flora and fauna characterised by endemic and nationally rare species. Although many of these ecosystems are under threat from anthropogenic modification and their biodiversity values are declining, they still are not adequately identified by current land classifications. We c...
Vegetation productivity is an essential variable in ecosystem functioning. Vegetation dynamics of dryland ecosystems are most strongly determined by water availability and consequently by rainfall and there is a need to better understand how water limited ecosystems respond to altered rainfall amounts and variability. This response is partly determined by the vegetation functional response to r...
in the name of allah , the compassionate the merciful abstract shath ( blasphemic utterace made during spiritual ) is a complicated concept that deserves reflection in gnosticism and sufism ( mysticism ) and estem and westem scholars have alwaya paid attention to it. although principal essence of gnostic belief is the holy divine law ,gnosticism has pure and unique thoughts . by glancing at t...
This report combined spring-aquatic observations (starting in March 1995) of select macroinvertebrates, with summer-dry observations (extending through August 1995) of select plants from the same vernal pool ecosystems at the Vina Plains Preserve, southern Tehama County, California. Density indices were developed from catch-and-release collections of Lepidurus packardi and Branchinecta conserva...
Preventive and/or manipulative practices will be needed to maintain soil's biological, physiochemical, nutritional, and structural health in natural, managed, and disturbed ecosystems as a foundation for food security and global ecosystem sustainability. While there is a substantial body of interdisciplinary science on understanding function and structure of soil ecosystems, key gaps must be br...
We review the status of marine shellfish ecosystems formed primarily by bivalves in Australia, including: identifying ecosystem-forming species, assessing their historical and current extent, causes for decline and past and present management. Fourteen species of bivalves were identified as developing complex, three-dimensional reef or bed ecosystems in intertidal and subtidal areas across trop...
The order of species arrival during community assembly can greatly affect species coexistence, but the strength of these effects, known as priority effects, appears highly variable across species and ecosystems. Furthermore, the causes of this variation remain unclear despite their fundamental importance in understanding species coexistence. Here, we show that one potential cause is environment...
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