13093 to 13104 of 13961 results
Databases and Geographical Information Systems are becoming increasingly popular tools for biogeographic analysis. The reliability of the analysis depends on the accuracy of the entered data and the ability to […]
The steepest latitudinal and longitudinal gradients in taxonomic diversity at the present day are those associated with tropical high diversity foci. Although there has been a tendency in the past […]
We still have much to learn about the evolution of taxonomic diversity gradients through geologic time. For example, have latitudinal gradients always been as steep as they are now, or […]
The temporal evolution of electron distributions and associated wave activity following substorm injections in the inner magnetosphere are investigated using data from the CRRES satellite. Equatorial electron distributions and concomitant […]
Electron pitch angle distributions sharply peaked at 90 degrees pitch angle were first recorded in the energy range 50 eV < E < 500 eV by the GEOS-1 and GEOS-2 […]
Over 15 months between January 1990 and March 1991, a range of physical, chemical and biological parameters was monitored regularly in fellfield soils of frost-sorted polygons at four sites on […]
Growth and mortality of 3 species (Inversiula nutrix, Celleporella bougainvillei, Fenestrulina rugula) of encrusting bryozoans were examined from 5 Antarctic localities, along a latitudinal gradient. Typically, growth in marine invertebrates […]
Overgrowth competition, sub-lethal mortality (some zooids killed but colony survives) and subsequent growth from fragments, and diversity of communities encrusting rocks (pebble through to boulder size) were examined from five […]
The Madagascar coast (both) has a higher density and diversity of hermit crabs than is known from any other localiy in the western Indian Ocean. Of the 20 species occurring […]
Qualitative samples of Collembola were obtained from a range of substrates near Husvik, Stromness Bay, South Georgia, between January anti March 1996. Collections made at Hope Point near Grytviken (Cumberland […]
Aim Encrusting faunal communities on rocks were examined from Southern Ocean intertidal and subtidal (6 m) zones to investigate potential change with latitude. Location The site locations were South Georgia […]
Two populations of the world’s most southerly diving beetle (Lancetes angusticollis) were studied on sub-Antarctic South Georgia between November 1995 and April 1996. Parallel observations were made on laboratory cultures […]