Results 61 to 70 of about 6,176 (252)
Punctuated equilibrium as the default mode of evolution of large populations on fitness landscapes dominated by saddle points in the weak-mutation limit [PDF]
arXiv, 2020 Punctuated equilibrium is a mode of evolution in which phenetic change occurs in rapid bursts that are separated by much longer intervals of stasis during which mutations accumulate but no major phenotypic change occurs. Punctuated equilibrium has been originally proposed within the framework of paleobiology, to explain the lack of transitional forms ...
arxiv
Human evolution: taxonomy and paleobiology [PDF]
Journal of Anatomy, 2000 This review begins by setting out the context and the scope of human evolution. Several classes of evidence, morphological, molecular, and genetic, support a particularly close relationship between modern humans and the species within the genus Pan, the chimpanzee.
Bernard Wood, Brian G. Richmond
openaire +3 more sources
Lethaia, EarlyView., 2021 Biomineralization is a generic term used to indicate biological‐mediated mineral formation. In carbonate mineralization, nucleation of crystals can be: (1) controlled directly by the organisms, like in the skeletal formation of most metazoans; (2) induced by microbial communities, by indirect precipitation mediated by their metabolic activities; or (3)
Adriano Guido +4 more
wiley +1 more source
Tectonics may affect closed watersheds used to monitor climate change and human activity effects
Terra Nova, Volume 35, Issue 1, Page 58-65, February 2023., 2023 Abstract Playa lakes developed in closed watersheds have been used as environmental impact indicators (global warming, water extractions, etc.), but they could be also sensitive to active tectonics. Our study area is located in the main watershed in the western Betics, the northern branch of the Gibraltar arc, which is within the fold‐and‐thrust belt ...
Alejandro Jiménez‐Bonilla +2 more
wiley +1 more source
A ubiquitous ~62-Myr periodic fluctuation superimposed on general trends in fossil biodiversity. I. Documentation [PDF]
Paleobiology 37:92,2011, 2010 We use Fourier analysis and related techniques to investigate the question of periodicities in fossil biodiversity. These techniques are able to identify cycles superimposed on the long-term trends of the Phanerozoic. We review prior results and analyze data previously reduced and published.
arxiv
Archeological hair in paleobiological research
Journal of Biological Research - Bollettino della Società Italiana di Biologia Sperimentale, 2005 The aim of our research is to define some biological characteristics of ancient populations using hair. Samples of human hair from South American mummies housed in the Museum of Anthropology and Ethnography, Turin University, were studied by light microscopy, “tricocicloforo” measurements and Scanning Electron Microscopy (SEM).
MEAGLIA D +3 more
openaire +4 more sources
Broken Beds, but better science; using multiple hypotheses to interpret geological data
Terra Nova, Volume 35, Issue 1, Page 73-82, February 2023., 2023 Abstract In this study, we propose a multiple hypotheses approach to improve interpretations of limited remotely sensed datasets, such as sparsely exposed outcrops, subsurface datasets, or planetary objects using semi‐quantitative scoring and ranking of observable features.
Arnaud Gallois +3 more
wiley +1 more source
Journal of Quaternary Science, EarlyView.ABSTRACT Water bodies located in floodplains and tropical forests are known to be important carbon stores, but many are subjected to intensive pressures from damming, land use and climate changes. Sedimentary records preserve long‐term archives for understanding how such changes affect the quantity and quality of carbon stores.
Suzanne McGowan +8 more
wiley +1 more source
Shared patterns in body size declines among crinoids during the Palaeozoic extinction events
Scientific Reports, 2021 Crinoids were among the most abundant marine benthic animals throughout the Palaeozoic, but their body size evolution has received little attention. Here, we compiled a comprehensive database on crinoid calyx biovolumes throughout the Palaeozoic. A model
Mariusz A. Salamon +4 more
doaj +1 more source
Late Ordovician geographic patterns of extinction compared with simulations of astrophysical ionizing radiation damage [PDF]
Paleobiology 35, 311-320 (2009), 2008 Based on the intensity and rates of various kinds of intense ionizing radiation events such as supernovae and gamma-ray bursts, it is likely that the Earth has been subjected to one or extinction level events during the Phanerozoic. These induce changes in atmospheric chemistry so that the level of Solar ultraviolet-B radiation reaching the surface and
arxiv