Genetics of Natural Populations. XXV. Genetic Changes in Populations of Drosophila pseudoobscura and Drosophila persimilis in Some Localities in California

Evolution ◽  
1956 ◽  
Vol 10 (1) ◽  
pp. 82 ◽  
Author(s):  
Theodosius Dobzhansky
Keyword(s):  
Natural Populations ◽  
Drosophila Pseudoobscura ◽  
Genetic Changes ◽  
Drosophila Persimilis

Genetics of Natural Populations. XXXV. A Progress Report on Genetic Changes in Populations of Drosophila pseudoobscura in the American Southwest

Evolution ◽  
1964 ◽  
Vol 18 (2) ◽  
pp. 164 ◽  
Author(s):  
Th. Dobzhansky ◽  
W. W. Anderson ◽  
O. Pavlovsky ◽  
B. Spassky ◽  
C. J. Wills
Keyword(s):  
Natural Populations ◽  
Progress Report ◽  
American Southwest ◽  
Drosophila Pseudoobscura ◽  
Genetic Changes

Life History Changes in Eastern Mosquitofish (Gambusia holbrooki) Induced by Thermal Elevation

1991 ◽  
Vol 48 (1) ◽  
pp. 60-66 ◽  
Author(s):  
Gary K. Meffe
Keyword(s):  
South Carolina ◽  
Life History ◽  
Nuclear Reactor ◽  
Natural Populations ◽  
Life History Evolution ◽  
Gambusia Holbrooki ◽  
Genetic Changes ◽  
Thermal Death ◽  
Reproductive Biomass ◽  
Eastern Mosquitofish

Much light can be shed on life history evolution through study of responses of organisms to chronic exposure to a novel or perturbed environment. To determine the influence of 28 yr of temporally unpredictable thermal elevation on their life history patterns, I sampled eastern mosquitofish (Gambusia holbrooki) from a thermally elevated (outflow from a nuclear reactor) and an ambient (farm pond) habitat in South Carolina every month for 2 yr. Fish from the artificially heated environment reproduced all year, had higher reproductive investments (higher clutch sizes and reproductive biomass), and smaller offspring than did fish from the ambient environment, which ceased reproduction from October through March, typical for natural populations of the region. Likely environmental factors responsible for these differences include unpredictable food resources, higher mortality from thermal death, and higher predation by fishes and birds in the heated waters. The extent to which these life history alterations are the result of adaptive genetic changes versus phenotypically plastic responses remains to be tested.

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