Results 121 to 130 of about 294,307 (155)

Independence of alpha and beta diversities

Ecology, 2010
Denny, M., and S. Gaines. 2000. Chance in biology: using probability to explore nature. Princeton University Press, Princeton, New Jersey, USA. Jost, L. 2006. Entropy and diversity. Oikos 113:363-375. Jost, L. 2007. Partitioning diversity into independent alpha and beta components. Ecology 88:2427-2439. Quinn, G. P., and M. J. Keough.
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Beta-Diversity in Tropical Forest Trees

Science, 2002
The high alpha-diversity of tropical forests has been amply documented, but beta-diversity—how species composition changes with distance—has seldom been studied. We present quantitative estimates of beta-diversity for tropical trees by comparing species composition of plots in lowland terra firme forest in Panama, Ecuador, and Peru.
Condit, Richard S., Pitman, Nigel C. A., Leigh, Egbert Giles, Jr., Chave, Jerome, Terborgh, John W., Foster, Robin B., Nunez Vargas, Percy, Aguilar, Salomo´n, Valencia, Renato, Villa Munoz, Gorky, Muller-Landau, Helene C., Losos, Elizabeth Claire, Hubbell, Stephen P.   +12 more
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A review of beta diversity studies

Biodiversity Science, 2010
Beta diversity is an important component of biological diversity, measuring compositional change in species assemblages across temporal and spatial scales. Beta diversity concerns not only a number of ecological and evolutionary issues, but can also guide the selection of protected areas and help to optimize conservation networks.
Chen Shengbin, Ouyang Zhiyun, Xu Weihua, Xiao Yi   +3 more
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Diversity of amyloid beta peptide actions

Reviews in the Neurosciences
Abstract Fibril formation by amyloidogenic proteins and peptides is considered the cause of a number of incurable diseases. One of the most known amyloid diseases is Alzheimer’s disease (AD). Traditionally, amyloidogenic beta peptides Aβ40 and Aβ42 (Aβs) are considered as main causes of AD and the foremost targets in AD fight.
Sona Mardanyan, Svetlana Sharoyan, Alvard Antonyan   +2 more
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Patterns of elevational beta diversity in micro‐ and macroorganisms

Global Ecology and Biogeography, 2012
ABSTRACTAim  While ecologists have long been interested in diversity in mountain regions, elevational patterns in beta diversity are still rarely studied across different life forms ranging from micro‐ to macroorganisms. Also, it is not known whether the patterns in turnover among organism groups are affected by the degree to which the environment is ...
Jianjun Wang, Janne Soininen, Yong Zhang, Beixin Wang, Xiangdong Yang, Ji Shen   +5 more
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Measuring beta‐diversity from taxonomic similarity

Journal of Vegetation Science, 2007
AbstractQuestion: The utility of beta (β‐) diversity measures that incorporate information about the degree of taxonomic (dis)similarity between species plots is becoming increasingly recognized. In this framework, the question for this study is: can we define an ecologically meaningful index of β‐diversity that, besides indicating simple species ...
Giovanni Bacaro, RICOTTA, Carlo, Stefano Mazzoleni   +2 more
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Reliable estimates of beta diversity with incomplete sampling

Ecology, 2018
AbstractBeta diversity, the compositional variation among communities or assemblages, is crucial to understanding the principles of diversity assembly. The mean pairwise proportional dissimilarity expresses overall heterogeneity of samples in a data set and is among the most widely used and most robust measures of beta diversity.
Roden, Vanessa, Kocsis, Adam T., Zuschin, Martin, Kiessling, Wolfgang   +3 more
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A geometric approach to beta diversity

Ecological Monographs
AbstractBeta diversity—the variation among community compositions in a region—is a fundamental measure of biodiversity. Most classic measures have posited that beta diversity is maximized when each community has a distinct, nonoverlapping set of species.
Chuliang Song, Muyang Lu, Joseph R. Bennett, Benjamin Gilbert, Marie‐Josée Fortin, Andrew Gonzalez   +5 more
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Phylogenetic and Functional Beta Diversity

2013
The first objective of this chapter is to introduce the conceptual and empirical background for why phylogenetic and functional analyses of beta diversity are of interest to ecologists. This is followed by detailed instructions on how to calculate in R the major metrics of phylogenetic and functional beta diversity that are most commonly employed in ...
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Beta diversity for functional ecology

2008
The utility of biodiversity measures that incorporate pairwise species functional differences is becoming increasingly recognized. Functional diversity is regarded as the key for linking community composition to ecosystem processes like productivity, nutrient cycling, carbon sequestration, or stability when subject to perturbations.
RICOTTA, Carlo, BURRASCANO, SABINA
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