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A middle Cambrian arthropod with chelicerae and proto-book gills.
Nature
September 2019
Department of Natural History (Palaeobiology Section), Royal Ontario Museum, Toronto, Ontario, Canada.
The chelicerates are a ubiquitous and speciose group of animals that has a considerable ecological effect on modern terrestrial ecosystems-notably as predators of insects and also, for instance, as decomposers. The fossil record shows that chelicerates diversified early in the marine ecosystems of the Palaeozoic era, by at least the Ordovician period. However, the timing of chelicerate origins and the type of body plan that characterized the earliest members of this group have remained controversial.
View Article and Find Full Text PDFFast shoreline erosion induced by ship wakes in a coastal lagoon: Field evidence and remote sensing analysis.
PLoS One
November 2017
Department of Cybernetics, School of Science, Tallinn University of Technology, Tallinn, Estonia.
An investigation based on in-situ surveys combined with remote sensing and GIS analysis revealed fast shoreline retreat on the side of a major waterway, the Malamocco Marghera Channel, in the Lagoon of Venice, Italy. Monthly and long-term regression rates caused by ship wakes in a reclaimed industrial area were considered. The short-term analysis, based on field surveys carried out between April 2014 and January 2015, revealed that the speed of shoreline regression was insignificantly dependent on the distance from the navigation channel, but was not constant through time.
View Article and Find Full Text PDFWetland fields as mirrors of drought and the Maya abandonment.
Proc Natl Acad Sci U S A
March 2012
Department of Geography and Geoinformation Science, George Mason University, Fairfax, VA 22307, USA.
Getting at the Maya Collapse has both temporal and geographic dimensions, because it occurred over centuries and great distances. This requires a wide range of research sites and proxy records, ranging from lake cores to geomorphic evidence, such as stratigraphy and speleothems. This article synthesizes these lines of evidence, together with previously undescribed findings on Maya wetland formation and use in a key region near the heart of the central Maya Lowlands.
View Article and Find Full Text PDF[Stratigraphy of the heart and great vessels of the thoracic cavity].
Vestn Rentgenol Radiol
November 1998
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