نتایج جستجو برای: temporal diversity
تعداد نتایج: 426873 فیلتر نتایج به سال:
The diversity-stability hypothesis states that current losses of biodiversity can impair the ability of an ecosystem to dampen the effect of environmental perturbations on its functioning. Using data from a long-term and comprehensive biodiversity experiment, we quantified the temporal stability of 42 variables characterizing twelve ecological functions in managed grassland plots varying in pla...
phytoplankton communities play a significant role in the oceanic biological pump by forming the base of the trophic structure. increase in nutrients loading affects spatial and temporal distribution of phytoplankton. this study examined the phytoplankton community structure and ecological indices in relation to nutrients dynamics in both estuarine and oceanic areas of ramisi-vanga systems alon...
and deterministic processes regulate spatio-temporal variation in seed bank diversity" (2012). USDA Forest Service / UNL Faculty Publications. Paper 231. Abstract Question: Seed banks often serve as reservoirs of taxonomic and genetic diversity that buffer plant populations and influence post-disturbance vegetation trajectories; yet evaluating their importance requires understanding how their c...
We assessed changes in phylogenetic diversity of angiosperm flora on six oceanic islands located in the southeastern Pacific Ocean, by comparing flora from two periods: the pre-European colonization of islands and current times. We hypothesize that, in the time between these periods, extinction of local plant species and addition of exotic plants modified phylogenetic-α-diversity at different l...
E have historically been interested in the relationship between biodiversity and ecosystem functioning. Widespread loss of diversity caused by anthropogenic forces has heightened this interest and fostered a desire to determine the mechanisms underlying these relationships. Species diversity is expected to affect ecosystem processes, because the number and kinds of species present determine the...
BACKGROUND Diverse flower communities are more stable in floral resource production along the flowering season, but the question about how the diversity and stability of resources affect pollinator reproduction remains open. High plant diversity could favor short foraging trips, which in turn would enhance bee fitness. In addition to plant diversity, greater temporal stability of floral resourc...
Spatial diversity patterns are thought to be driven by climate-mediated processes. However, temporal patterns of community composition remain poorly studied. We provide two complementary analyses of North American mammal diversity, using (i) a paleontological dataset (2077 localities with 2493 taxon occurrences) spanning 21 discrete subdivisions of the Cenozoic based on North American Land Mamm...
Quality of life is multifaceted and relative concept. It is being affected by spatial and temporal variation as well as social – individual values. This bears different meaning for different groups. This study tries to measure quality of life based on subjective indices. It further identifies and analyses the major spatial factors responsible for life quality of the rural people. This study is ...
The study of spatial and temporal variability of distribution of phytoplankton communities in Northern part of the Persian Gulf (Qeshm andLengeh Islands) was studied. In this study, five groups (47 genera) of phytoplankton include Bacillariophyceae, Dinophyceae, Cyanophyceae, Crysophyceae and Euglenophyceae were identified. The results showed that Diatoms group (79.6 %) and Rhizosolenia genus (...
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