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Digitale Medien

Measurement of bacterial growth rates in soil

Harris, D. ; Paul, E.A.

Amsterdam : Elsevier

Applied Soil Ecology 1 (1994), S. 277-290

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ISSN: 0929-1393

Schlagwort(e): %G+C ; Microbial growth ; Soil ; Specific respiration ; Thymidine incorporation

Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Thema: Biologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1016/0929-1393(94)90005-1

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Digitale Medien

Genetic selection in presence of pathogens such as the lymphoid leukosis virus: computer simulation (1984)

Harris, D. L. ; Gavora, J. S. ; Spencer, J. L.

Springer

Theoretical and applied genetics 68 (1984), S. 397-413

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ISSN: 1432-2242

Schlagwort(e): Quantitative genetics ; Selection response ; Chickens ; Lymphoid leukosis ; Egg production ; Computer simulation

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary A computer model was developed to simulate the population dynamics involved when selection is for a trait influenced by the presence of a pathogen in addition to quantitative genetic factors. The lymphoid leukosis virus is such a pathogen, when selection is for egg production in chickens. It is transmitted congenitally from dam to offspring and horizontally from one individual to another. For these simulations, individual selection for high performance in the trait influenced by the pathogen was more effective than family selection for removing infected individuals from populations. The resulting reduction in the incidence of infected individuals in following generations made the overall response to individual selection greater than for family selection. However, the virus would remain in most populations due to horizontal transmission to individuals which later transmit the virus to their offspring. These horizontally infected individuals would not be eliminated in the selection process because their egg production was assumed to be less reduced than that of congenitally infected birds. These simulation results seem to mimic certain experimental results which heretofore have been difficult to explain since they were not consistent with quantitative genetic theoretical expectations from selection.