Show simple item record Barks, Patrick M. Laird, Robert A. 2016-06-14T22:26:47Z 2016-06-14T22:26:47Z 2016-06-14
dc.description Sherpa Romeo yellow journal (pre-print only, accepted for publication) en_US
dc.description.abstract As they grow old, most organisms experience progressive physiological deterioration resulting in declining rates of survival and reproduction – a seemingly maladaptive phenomenon known as senescence. Although senescence is usually defined with respect only to survival and reproduction, a third component of fitness, offspring quality, may also decline with age. Few studies, however, have assessed age-related changes in offspring quality using measures that truly reflect fitness. In a controlled environment, we tested for age-related declines in three demographic components of fitness (survival, reproduction, and offspring quality) in Lemna minor, a small aquatic plant in the subfamily Lemnoideae (the duckweeds) with a short lifespan and rapid rate of asexual reproduction. Our primary measure of offspring quality, the intrinsic rate of increase, more closely approximates fitness than measures used in previous studies such as size, lifespan, and total reproductive output. We observed strong age-related declines in all three components of fitness: old plants had lower rates of survival and reproduction, and produced lower-quality offspring than younger plants. Theoretical and empirical research on the evolutionary biology of senescence should devote more attention to offspring quality. This often unrecognized component of fitness may change with age – as we have shown in L. minor – and may be shaped by, and feed back into, the same evolutionary forces that give rise to senescence. en_US
dc.language.iso en_CA en_US
dc.subject Ageing en_US
dc.subject Lansing effect en_US
dc.subject Lemna minor en_US
dc.subject Life history en_US
dc.subject Parental age effects en_US
dc.title Senescence in duckweed: age-related declines in survival, reproduction, and offspring quality en_US
dc.type Article en_US
dc.publisher.faculty Arts and Science en_US
dc.publisher.department Department of Biological Sciences en_US
dc.publisher.institution University of Lethbridge en_US

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