Results 251 to 260 of about 53,027 (281)

Selectivity of End-Cretaceous Marine Bivalve Extinctions

Science, 1995
Analyses of the end-Cretaceous or Cretaceous-Tertiary mass extinction show no selectivity of marine bivalve genera by life position (burrowing versus exposed), body size, bathymetric position on the continental shelf, or relative breadth of bathymetric range.
D, Jablonski, D M, Raup
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Biological selectivity of extinction

2005
Selective survival across major extinction event horizons is both a bothersome puzzle and an opportunity to delimit the biologically interesting question of causality. Heritable differences in characters may have predictable consequences in terms of differential species survival.
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Patchy structure and selective extinction

Astrophysics and Space Science, 1985
In 1934 Bok argued that the observed phenomenon of clustering of galaxies could not be caused by intergalactic dust matter distributed like the interstellar clouds of dust in the Milky Way. Bok considered background clusters between foreground clusters of galaxies, while Zwicky investigated distant concentrations of galaxies through foreground clusters.
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Taxon age and selectivity of extinction

Paleobiology, 1991
Taxon-age distributions were compiled for families of marine animals surviving or becoming extinct in each stage of the Phanerozoic. I demonstrate, through the use of a modified bootstrap analysis, that there is no difference between the longevity of families becoming extinct during times of background extinction and times of mass extinction.
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Environmental determinants of extinction selectivity in the fossil record

Nature, 2008
The causes of mass extinctions and the nature of biological selectivity during extinction events remain central questions in palaeobiology. Although many different environmental perturbations have been invoked as extinction mechanisms, it has long been recognized that fluctuations in sea level coincide with many episodes of biotic turnover. Recent work
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Phylogeny and the selectivity of extinction in Australian marsupials

Animal Conservation, 2002
AbstractRecent studies have suggested that contemporary losses of species are unevenly distributed over phylogenies. Here, we show that species of Australian marsupials are at higher risk if they belong to genera that are species‐poor, old or phylogenetically distinct. Extinction risk in this group is also related to habitat and body size, being higher
Johnson, Christopher N., Delean, Steven, Balmford, Andrew   +2 more
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Selectivity of foraminiferal extinction in the late Eocene

Paleobiology, 1997
Late Eocene foraminiferal extinction shows diverse patterns of selective morphologic and latitudinal extinction. Taxa with discoidal shape, calcareous tests, and narrow and low-latitudinal ranges are at significantly greater risk of extinction. Elevated extinction intensities in calcareous tests are mainly due to the presence of larger benthic ...
Amit Banerjee, George E. Boyajian
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Problems in Extinction Model Selection and Parameter Estimation

Environmental Management, 2000
It is a vexing problem to achieve a consensus about the proper scientific way to assess population viability for habitat conservation plans. Rather than a hypothesis-testing approach, here it is proposed to select population models, estimate extinction parameters, and assess prediction uncertainty using a pragmatic, empirical Bayesian approach.
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SELECTIVE SPATIAL ATTENTION IN PATIENTS WITH VISUAL EXTINCTION

Brain, 1990
The present study was designed to verify the attentional performance of patients with parietal lesions in the experimental condition in which they had to pay attention to 3 spatial positions located on the left, on the right and directly above the fixation stimulus (Experiment 1) and to only 1 of the 3 spatial positions at a time (Experiment 2). Twelve
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Probability of Extinction in a Finite Population with Truncation Selection

Biometrics, 1980
SUMMARY A model is considered for a finite population in the presence of a combination of natural and artificial selection. The population is assumed to contain two types of individuals which reproduce according to a Poisson distribution. The probability that a given type is lost within a certain time is obtained.
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