Global diversity and body size

Article Abstract:

Most species within any specific group of organisms lie in an optimal, intermediate size range, where there are more chances of the appearance of dominating species. However, the species-abundance relationship observed in insects may be unamenable for extrapolation to other group of organisms. In the microbial world, many species may be found in a small natural sample but the global number of such species may be modest. The extrapolation of these results to the bacterial world may support the abundance of these small-bodied taxa among the diverse species on the Earth.

Analysis, Observations, Biological diversity, Biodiversity, Body size, Body weights and measures, Microorganisms, Species diversity, Dispersal (Ecology)

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A purple protist

Article Abstract:

A ciliate, Strombidium purpureum Kahl, was isolated from the photic, upper layer of anaerobic, sulphide-containing marine sands. Analysis ofthese ciliates showed the presence of purple endosymbionts which are probably related to the genus Rhodopseudomonas. In this interaction, the bacteria utilize metabolic end-products of the host and protects the host against oxygentoxicity. This interaction is probably similar to the association which gave rise to the present-day mitochondria.

Research, Symbiosis, Identification and classification, Mitochondria, Origin, Bacteria, Photosynthetic, Photosynthetic bacteria

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Veil architecture in a sulphide-oxidizing bacterium enhances countercurrent flux

Article Abstract:

The marine sulphide-oxidizing bacterium Thiovulum majus forms white veils on or above sulphidic sediments. The cell motility results in a helicoid swimming path, and cells exhibit pronounced chemosensory behaviour in O(sub2) gradients. Areas with high cell densities draw oxygenated water downwards through the veil. The microbial community structure therefore overcomes the restrictions of diffusion, thus enhancing the respiration and sulphide oxidation rates.

Physiological aspects, Oxygen, Marine bacteria, Oxygen transport

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