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We investigate the extent to which functional structure and spatial variability of intertidal communities coincide with major biogeographical boundaries, areas where extensive compositional changes in the biota are observed over a limited geographic extension. We then investigate whether spatial variation in the biomass of functional groups, over geographic (10′s km) ....

By E.A. Wieters,C.D. McQuaid,G. Palomo,P. Pappalardo--Plos--2013-11-16
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Predicting shifts of species geographical ranges is a fundamental challenge for conservation ecologists given the great complexity of factors involved in setting range limits. Distributional patterns are frequently modelled to “simplify” species responses to the environment, yet the central mechanisms that drive a particular pattern are rarely understood. We evaluat....

By S. Baldanzi,C.D. McQuaid,S. Cannicci,F. Porri--Plos--2013-01-23
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We explore observables in a lattice Universe described by a recently found solution to Einstein field equations. This solution models a regular lattice of evenly distributed objects of equal masses. This inhomogeneous solution is perturbative, and, up to second order in a small parameter, it expands at a rate exactly equal to the one expected in a dust dominated Friedma....

By J-P. Bruneton,J. Larena--Institute of Physics (IOP Publishing)--2013-01-21
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From introduction: Gerwel was an exceptional, courageous, gifted and pioneering South African intellectual, scholar, leader and citizen. He had a profound commitment to creating a just and humane society. Through a long and distinguished association with the higher education sector, as an academic, dean, vice-chancellor, chairperson of the Committee of University Prin....

By S. Badat----2012-12-02
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By M.H. Villet--Rhodes University--2012-10-24
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By associating closely with others to form a group, an animal can benefit from a number of advantages including reduced risk of predation, amelioration of environmental conditions, and increased reproductive success, but at the price of reduced resources. Although made up of individual members, an aggregation often displays novel effects that do not manifest at the l....

By K.R. Nicastro,G.I. Zardi,C.D. McQuaid,G.A. Pearson,E.A. Serrão--Public Library of Science--2012-10-16
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We define, by an integral of geometric quantities over a spherical shell of arbitrary radius, an invariant gravitational entropy. This definition relies on defining a gravitational energy and pressure, and it reduces at the horizon of both black branes and black holes to Wald's Noether charge entropy. We support the thermodynamic interpretation of the proposed entropy b....

By R Brustein,A.J.M Medved----2012-08-29
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The Numerical INJection Analysis (NINJA) project is a collaborative effort between members of the numerical relativity and gravitational wave data analysis communities. The purpose of NINJA is to study the sensitivity of existing gravitational-wave search and parameter-estimation algorithms using numerically generated waveforms, and to foster closer collaboration betwee....

By P. Ajith,M. Boyle,D.A. Brown,B. Brugmann,L.T. Buchman,D. Pollney--Institute of Physics--2012-06-21
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Background: When genetic structure is identified using mitochondrial DNA (mtDNA), but no structure is identified using biparentally-inherited nuclear DNA, the discordance is often attributed to differences in dispersal potential between the sexes. Results: We sampled the intertidal rocky shore mussel Perna perna in a South African bay and along the nearby open coast,....

By P.R. Teske,I. Papadopoulos,N.P. Barker,C.D. McQuaid--BioMed Central--2012-06-13
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We calculate graviton n-point functions in an anti-de Sitter black brane background for effective gravity theories whose linearized equations of motion have at most two time derivatives. We compare the n-point functions in Einstein gravity to those in theories whose leading correction is quadratic in the Riemann tensor. The comparison is made for any number of gravitons....

By R Brustein,A.J.M Medved--American Physical Society--2012-04-23
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[from the Introduction] Straddled between the northern and southern boundaries of the Antarctic Circumpolar Current (ACC), Sub-antarctic islands are typically oceanic; experiencing moist, cool and windy climates. They are classified as regions, in which the terrestrial and marine ecosystems are relatively simple and extremely sensitive to perturbations. One such ex....

By I.J. Ansorge,P.W. Froneman,J.V. Durgadoo--InTech--2012-03-02
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Our first purpose is to produce knowledge, so that we can better understand our natural and social worlds and also enrich our scientific and cultural heritage. The second purpose of a university is to disseminate knowledge and to develop critical and creative minds. Our goals, yours and ours, must be for you to think imaginatively, ‘effectively and critically;’ to....

By S. Badat----2012-02-05
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