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niche
Root Ecological Niche Index and Root Distribution Characteristics of Artificial Phytocommunities in Rehabilitated Fields
      
The ecological niche that roots occupy, their abundance and distribution, and the factors that affect them must be acknowledged.
      
In the first instance therefore, a new method to calculate the root ecological niche index (RENI) is proposed, embracing the entire phytocommunity of plantations.
      
Niche of insect borers within Pinus massoniana infected by pine wood nematode
      
The niche width, proportional similarity of niche and the niche overlap of dominant species of dying trees were computed.
      
Species within host trees vary from winter to summer and all the species have their own niche width, proportional similarity of niche and the niche overlap.
      
Dominance of Dremomys pernyi and Callosciurus erythraeus in small mammal communities, time niche breadth, and time niche overlap between the two small mammals were calculated, respectively.
      
Niche characteristics of rodents by diverse disturbance in Alashan desert, Inner Mongolia, China
      
Their spatial and temporal niches among the four disturbance types were assessed using the Shannon-Wiener niche breadth index and the Pianka niche overlap index.
      
The Pianka niche overlap indices of six-paired species were the highest and varied from 0.900 to 1.000, suggesting their spatial niche overlapped almost completely.
      
Conversely, the spatial niche overlap index for Meriones unguiculatus, Cardiocranius paradoxus, and Salpingotus kozlovi was zero, thus indicating a complete absence of competition among them.
      
In addition, the temporal niche breadth and overlap indices varied greatly in relation to disturbance types and season.
      
The level of temporal niche overlap in spring and autumn was low while in summer it was high.
      
For all disturbance types and for each season, the temporal niche overlap index of Meriones meridianus and Cricetulus barabansis was always highest but for Meriones unguiculatus and Salpingotus kozlovi always lowest.
      
The traditional niche-assembly theory asserts that species live together in a community only when they differ from one another in resource uses.
      
As an alternative to the niche theory, Hubbell and other ecologists introduced a neutral model.
      
Unlike the niche-assembly theory, the neutral theory takes similarity in species and individuals as a starting point for investigating species diversity.
      
We also suggest that the most important task in the future is to bridge the niche-assembly theory and the neutral theory, and to add species differences to the neutral theory and more stochasticity to the niche theory.
      
Phytohormones are viewed as specific mediators in interactions between various organisms inhabiting the same ecological niche, the biological role of which is not limited to processes taking place in plants.
      
Stem cells occupy a special niche that provides a microenvironment, including an adhesion of stem cells to the basal membrane and their paracrine interactions with neighbor epidermal and mesenchymal cells.
      
 

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