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Grazing of protozoa and its effect on populations of aquatic bacteria (2001)

Hahn, Martin W. ; Höfle, Manfred G.

Oxford, UK : Blackwell Publishing Ltd

FEMS microbiology ecology 35 (2001), S. 0

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ISSN: 1574-6941

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Predation by bacterivorous protists in aquatic habitats can influence the morphological structure, taxonomic composition and physiological status of bacterial communities. The protistan grazing can result in bacterial responses at the community and the species level. At the community level, grazing-induced morphological shifts have been observed, which were directed towards either larger or smaller bacterial sizes or in both directions. Morphological changes have been accompanied by changes in taxonomic community structure and bacterial activity. Responses at the species level vary from species to species. Some taxa have shown a pronounced morphological plasticity and demonstrated complete or partial shifts in size distribution to larger growth forms (filaments, microcolonies). However, other taxa with weak plasticity have shown no ability to reduce grazing mortality through changes in size. The impact of protistan grazing on bacterial communities is based on the complex interplay of several parameters. These include grazing selectivity (by size and other features), differences in sensitivity of bacterial species to grazing, differences in responses of single bacterial populations to grazing (size and physiology), as well as the direct and indirect influence of grazing on bacterial growth conditions (substrate supply) and bacterial competition (elimination of competitors).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1574-6941.2001.tb00794.x

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Genetic influences on ultrasonic vocalizations in young mice (1987)

Hahn, Martin E. ; Hewitt, John K. ; Adams, Mark ; [et al.]

Springer

Behavior genetics 17 (1987), S. 155-166

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ISSN: 1573-3297

Keywords: ultrasounds ; mouse ; inbred strains ; Mendelian cross ; single gene ; biometrical genetics

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Psychology

Notes: Abstract Ultrasonic calls produced by young mice elicit maternal investigation and retrieval, and their characteristics have been shown to vary with age and genotype. In this study, we completed a full Mendelian cross of two inbred strains BALB/cJ and DBA/2J. The major result was the detection of directional dominance for a high rate of calling. Other characteristics were influenced by additive and maternal effects in the absence of directional dominance. We estimate the number of loci involved in the rate of calling to be about 1—facilitating studies of a gene-to-behavior pathway.