Nitrification in Antarctic soils

Article Abstract:

Marshall's explanation for the presence of pollen from trees considered foreign to Antarctica is used to account for the presence of bacteria in the region. Marshall believes that a specific weather pattern enabled exotic biological particles to be carried by the wind from South America to Antarctica. It is proposed that wind-borne dispersal of bacteria throughout the region may have occurred at the same time as wind-borne transfer of bacteria. The temperature in tested soils suggests that nitrifiers may not have originated in Antarctica.

Bacteria, Microorganisms, Antarctic regions, Origin, Dispersal (Ecology), Nitrification

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Succeeding in the sand dunes

Article Abstract:

Soil-carried plant pathogens may cause plant species to succeed each other as dominant in sand dune ecology. W.H. Van der Putten and coworkers tested the supposition that disease-causing organisms that attack particular plant species could engender plant succession. Their results, showing that pathogens cause the marram grass Ammophila arenaria, the fescue Festuca rubra, the sand sedge Carex arenaria and the sea couch Elymus athericus to follow each other in turn, are impressive but not conclusive.

Models, Causes of, Environmental aspects, Plant-pathogen relationships, Plant succession, Sand dune ecology, Dune ecology, Sand dune flora, Dune plants

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Nonlinearity and the Moran effect

Article Abstract:

Issues are presented concerning the synchronization phenomena which exist in two populations of feral sheep and their influence on extrinsic environmental variation and population dynamics.

Behavior, Feral livestock, Sheep, Population biology

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