2026-09-20T00:27:15.414010400Zhttps://opus.uleth.ca/server/oai/requestoai:opus.uleth.ca:10133/36662016-09-09T21:58:38Zcom_10133_3346com_10133_1com_10133_296col_10133_3347col_10133_298
ULethbridge OPUS Repository
supervisor
Laird, Robert A.
author
Barks, Patrick M.
2015-04-29T20:59:48Z
2015-04-29T20:59:48Z
2015
https://hdl.handle.net/10133/3666
Senescence is characterized by age-related deterioration within individual organisms and a resultant decline in rates of survival or reproduction. Such declines seem inherently maladaptive, but occur nonetheless in a wide range of species. My thesis contributes to the questions of (i) why senescence is common in nature, and (ii) why patterns of senescence sometimes vary markedly both within and among species. With respect to why senescence is common, most evolutionary theory on senescence makes the simplifying assumption that all offspring are of equal quality. I show that this assumption does not hold in the aquatic plant Lemna minor, and develop a theoretical model to investigate how age-related declines in offspring quality influence the ‘force’ of natural selection. With respect to variation in patterns of senescence, I describe a common garden experiment demonstrating a high degree of among-population consistency in life expectancy and rates of senescence in L. minor.
en_CA
age-related declines
Lemna minor
offspring quality
senescence
Parental age effects and the evolution of senescence in Lemna minor
Thesis
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URL
http://localhost:4000/bitstreams/9d93f772-c4fe-46b3-9c1a-0ebe2e2e244c/download
File
MD5
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application/pdf
BARKS_PATRICK_PHD_2015.pdf
URL
http://localhost:4000/bitstreams/1e0b9011-ca7e-4858-bbda-cfaa15d9c37b/download
File
MD5
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text/plain
BARKS_PATRICK_PHD_2015.pdf.txt