منابع مشابه
Community-level regulation of temporal trends in biodiversity
Many theoretical models of community dynamics predict that species richness (S) and total abundance (N) are regulated in their temporal fluctuations. We present novel evidence for widespread regulation of biodiversity. For 59 plant and animal assemblages from around the globe monitored annually for a decade or more, the majority exhibited regulated fluctuations compared to the null hypothesis o...
متن کاملElevational Trends in Biodiversity
alpha diversity Number of species within a restricted area, usually a small sample from a homogenous habitat. beta diversity Change in species composition from one area to another. ecotone An abrupt spatial transition from one community to another often caused by a change in environmental conditions or in the disappearance of a dominant species like the forest limit. gamma diversity Total numbe...
متن کاملTrends in Agricultural Biodiversity
" Biodiversity is a non-detachable part of the concept of sustainability. ... biodiversity is essential for agricultural production, as agriculture should be for biodiversity conservation. " Brazilian Government proposal to SBSTTA of the CBD, Second Meeting Montreal 2–6 September 1996 Although the context of this paper is a " World Biodiversity Update, " any attempt at such would be presumptuou...
متن کاملMeasuring phylogenetic biodiversity
Biodiversity has been described as the ‘biology of numbers and difference’ (Gaston 1996). Because species are different from one another, traditional metrics of biodiversity such as species richness or evenness increase when there are more species or when abundance is more equally apportioned among these species (see Chapters 4 and 5). Not only are species different from one another, the magnit...
متن کاملGlobal Marine Biodiversity Trends
■ Abstract Marine biodiversity encompasses all levels of complexity of life in the sea, from within species to across ecosystems. At all levels, marine biodiversity has naturally exhibited a general, slow trajectory of increase, punctuated by mass extinctions at the evolutionary scale and by disturbances at the ecological scale. In historical times, a synergy of human threats, including overfis...
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ژورنال
عنوان ژورنال: AStA Advances in Statistical Analysis
سال: 2017
ISSN: 1863-8171,1863-818X
DOI: 10.1007/s10182-017-0308-1