Ethan P. White

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Species abundance distributions (SADs) follow one of ecology's oldest and most universal laws--every community shows a hollow curve or hyperbolic shape on a histogram with many rare species and just a few common species. Here, we review theoretical, empirical and statistical developments in the study of SADs. Several key points emerge. (i) Literally dozens(More)
Body size is perhaps the most fundamental property of an organism and is related to many biological traits, including abundance. The relationship between abundance and body size has been extensively studied in an attempt to quantify the form of the relationship and to understand the processes that generate it. However, progress has been impeded by the under(More)
Power-law frequency distributions characterize a wide array of natural phenomena. In ecology, biology, and many physical and social sciences, the exponents of these power laws are estimated to draw inference about the processes underlying the phenomenon, to test theoretical models, and to scale up from local observations to global patterns. Therefore, it is(More)
The species abundance distribution (SAD) is one of themost studied patterns in ecology due to its potential insights into commonness and rarity, community assembly, and patterns of biodiversity. It is well established that communities are composed of a few common and many rare species, and numerous theoretical models have been proposed to explain this(More)
S. K. Morgan Ernest*, Brian J. Enquist, James H. Brown, Eric L. Charnov, James F. Gillooly, Van M. Savage, Ethan P. White, Felisa A. Smith, Elizabeth A. Hadly, John P. Haskell, S. Kathleen Lyons, Brian A. Maurer, Karl J. Niklas and Bruce Tiffney Department of Biology, University of New Mexico, Albuquerque, NM, USA Department of Ecology and Evolutionary(More)
Theoretical models for allometric relationships between organismal form and function are typically tested by comparing a single predicted relationship with empirical data. Several prominent models, however, predict more than one allometric relationship, and comparisons among alternative models have not taken this into account. Here we evaluate several(More)
Allen H. Hurlbert* and Ethan P. White Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA *Correspondence: E-mail: hurlbert@unm.edu Present address: Ethan P. White, Department of Biology, Utah State University, 5305 Old Main Hill, Logan, UT 84322, USA Abstract Species richness patterns are characterized either by overlaying species(More)
The species /time relationship (STR) describes how the species richness of a community increases with the time span over which the community is observed. This pattern has numerous implications for both theory and conservation in much the same way as the species /area relationship (SAR). However, the STR has received much less attention and to date only a(More)
Power-law relationships are among the most well-studied functional relationships in biology. Recently the common practice of fitting power laws using linear regression (LR) on log-transformed data has been criticized, calling into question the conclusions of hundreds of studies. It has been suggested that nonlinear regression (NLR) is preferable, but no(More)
Resource limitation represents an important constraint on ecological communities, which restricts the total abundance, biomass, and community energy flux a given community can support. However, the exact relationship among these three measures of biological activity remains unclear. Here we use a simple framework that links abundance and biomass with an(More)