3,756 research outputs found
A Nonlinear Ergodic Theorem for Discrete Systems
No full text27 pages, 1 article*A Nonlinear Ergodic Theorem for Discrete Systems* (Crowe, K. M.) 27 page
Experimental and theoretical (e, 2e) studies of argon (3p) ionization in asymmetric geometry
No full textM Stevenson, G J Leighton, A Crowe, K Bartschat, O K Vorov and D H Madiso
Fundamental Constants of Physics [Book Review]
No full textBook review of: Fundamental Constants of Physics. E. R. COHEN, K. M.
CROWE, AND J. W. M. DuMOND. Pp. 287+ix. Interscience
Monographs in Physics and Astronomy,
Volume I. Interscience Publishers, Inc., New York,
1957
Interactive effects of losing key grazers and ecosystem engineers vary with environmental context
No full textLoss of biodiversity may cause significant changes to ecosystem structure and functioning. Evidence from long-term in situ removal experiments is rare but important in determining the effects of biodiversity loss against a background of environmental variation. Limpets and mussels are thought to be important in controlling community structure on wave-exposed shores in the UK: limpets as key grazers, mussels as ecosystem engineers. A long-term factorial removal experiment revealed interactive effects that varied between 2 shores in SW England. At one site (Harlyn), removing limpets caused a significant shift in community structure, but where limpets were lost, the presence or absence of mussels made little difference. Where limpets were present, however, the removal of mussels changed the structure and variability of the community. At the other site (Polzeath), the loss of mussels caused significant changes in community structure, and limpets played a less important role. At Harlyn, fucoid algae were abundant throughout the year. There were fewer algae at Polzeath, and cover was dominated by the summer bloom of ephemerals. At Harlyn, the limpets played a major role in controlling algae, but their effects were mediated by the presence of mussels. Other grazers were not able to fulfil their role. At Polzeath, mussels were far more important, and ephemeral algae grew on them regardless of the presence or loss of limpets. These findings emphasise the need to assess spatial and temporal variation in the effects of biodiversity loss and the importance of interactive effects of loss of multiple species from different functional groups
Taxonomy, phylogenetic and biogeographical relationships of African grassland Francolins (Genus: Scleroptila)
No full textBibliography: leaves 23-28.The potential for using a combination of molecular and whole-organismal data has opened up new avenues for avian taxonomy, phylogenetics and biogeography. Such a multifaceted approach is used here to identify diagnosable taxa within the Orange River Francolin Scleroptila levaillanloides species complex and resolve evolutionary relationships between these taxa and other mono-and polytypic forms within the Red-winged Group of francolins (= genus Scleroplila sensli lalo). Mitochondrial cytochrome-b DNA sequence data (±250 b.p.) from 50 individuals and 19 morphological characters extracted from reports in published literature were employed to achieve these aims. These characters were analysed separately and also in combination using maximum parsimony (DNA sequences and organismal data), maximum likelihood (DNA sequences) and distance (DNA sequences) analyses. Monophyly of the Red-winged Group plus the Ring-necked Francolin Dendroperdix slreptophorus was supported by all the analyses (bootstrap support ranged from 50%-94%) except distance analysis. The Orange River Francolin complex was found to be non-monophyletic. Two distinct clades were identified, one comprising taxa from southwestern and the other from northeastern Africa. Morphological analysis yielded a distinct clade of the southwestern Orange River Francolin. The other polytypic species and assemblages thereof show poor resolution. The results of this study clearly demonstrate a need for further assessment of the taxonomic status of Scleroptila spp. and their phylogenetic relationships
Author and Educator Jody Allen Crowe to Speak on Fetal Alcohol Spectrum Disorder at the U of M Crookston on Monday, January 26, 2009; Presentation begins at 2 p.m. in Kiehle Auditorium
No full textWilson, Laurie; Tollefson, Elizabeth. (2009). Author and Educator Jody Allen Crowe to Speak on Fetal Alcohol Spectrum Disorder at the U of M Crookston on Monday, January 26, 2009; Presentation begins at 2 p.m. in Kiehle Auditorium. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/222016
Population genetics, behavioural ecology and management of the Greywing Francolin Francolinus africanus
No full textBibliography: p. 237-249.This study investigates the population genetics and behavioural ecology of the Greywing Francolin, Francolinus africanus, and identifies factors which influence the distribution and abundance of this important gamebird. It also develops scientifically sound management strategies which should allow the maintenance of populations at levels which will produce sustained and economically viable hunting yields as a co-product of agriculture. Examination of genetic variability based on allozymes disclosed estimates of average within-population heterozygosity higher than that for most birds, and for all other galliformes for which data are available. Thus, Greywing apparently have a high degree of population stability and large effective population sizes. Indirect estimates of migration and several significant allelefrequency differences between nearby coveys suggest that there is a greater degree of genetic subdivision among Greywing populations than among populations of other birds. However, although the data suggest that populations are genetically differentiated on a large geographical scale, they also indicate that there is considerable dispersal, which produces outbred subpopulations on a fine geographical scale. Greywing therefore have a wealth of genetic variability that may 'buffer' populations against environmental changes, responsible hunting and/or short-term demographic bottlenecks. They also appear to undergo sufficient migration so that recruitment from adjacent populations will ensure population stability in hunted areas
sj-pdf-1-cep-10.1177_03331024231161746 - Supplemental material for Migraine and risk of hypertensive disorders of pregnancy: A population-based cohort study
No full textSupplemental material, sj-pdf-1-cep-10.1177_03331024231161746 for Migraine and risk of hypertensive disorders of pregnancy: A population-based cohort study by Holly M Crowe, Amelia K Wesselink, Elizabeth E Hatch, Lauren A Wise and Susan S Jick in Cephalalgia</p
sj-docx-1-cpc-10.1177_10556656221125377 - Supplemental material for Psychological and Peer Difficulties of Children with Cleft Lip and/or Palate: A Systematic Review and Meta-Analysis
No full textSupplemental material, sj-docx-1-cpc-10.1177_10556656221125377 for Psychological and Peer Difficulties of Children with Cleft Lip and/or Palate: A Systematic Review and Meta-Analysis by Emma K. Branson and
Victoria M. Branson, Roisin McGrath,
Vanessa C. Rausa, Nicky Kilpatrick, Louise M. Crowe in The Cleft Palate-Craniofacial Journal</p
Taxonomy, phylogeny and eco-biogeography of southern African white-eyes (Zosterops spp.) Aves: order Passeriformes, Family: Zosteropidae
No full textIncludes abstract.Includes bibliographical references (p. 193-216).The aim of this study was to incorporate all lines of evidence to establish the true taxonomy and phylogeny of southern African Zosterops. Character data sets used include plumage and morphometric measures, vocal characters and molecular (mitochondrial and nuclear) DNA sequences. A broad scale phylogeographic analysis was also performed to establish the evolutionary process driving the diversity observed among these birds
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