Reproductive decisions are sensitive to cues of life expectancy: the case of a moth

Javoiš, Juhan; Tammaru, Toomas

doi:10.1016/j.anbehav.2003.10.022

Cited by 81 publications

(70 citation statements)

References 33 publications

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“…Fox & McCoy 2000;Bonneaud et al 2004;Javois & Tammaru 2004) and decreasing in others (e.g. Ilmonen et al 2000;Råberg et al 2000;Bonneaud et al 2003).…”

Section: Discussionunclassified

Senescent birds redouble reproductive effort when ill: confirmation of the terminal investment hypothesis

2006

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This study reports an experimental confirmation of the terminal investment hypothesis, a longstanding theoretical idea that animals should increase their reproductive effort as they age and their prospects for survival and reproduction decline. Previous correlational and experimental attempts to test this hypothesis have yielded contradictory results. In the blue-footed booby, Sula nebouxii, a long-lived bird, after initial increase, male reproductive success declines progressively with age. Before laying, males of two age classes were challenged with lipopolysaccharide to elicit an immune response, which induced symptoms of declining survival prospects. Reproductive success of immune-challenged mature males fell, while that of immune-challenged old males showed a 98% increase. These results demonstrate that senescent males with poor reproductive prospects increase their effort when those prospects are threatened, whereas younger males with good reproductive prospects do not.

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“…Fox & McCoy 2000;Bonneaud et al 2004;Javois & Tammaru 2004) and decreasing in others (e.g. Ilmonen et al 2000;Råberg et al 2000;Bonneaud et al 2003).…”

Section: Discussionunclassified

Senescent birds redouble reproductive effort when ill: confirmation of the terminal investment hypothesis

2006

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“…It has been shown that injury affects mating patterns in insects. Injured medflies will mate less frequently than intact medflies (Javois and Tammaru, 2004).…”

Section: Introductionmentioning

confidence: 98%

Interactions between injury, stress resistance, reproduction, and aging in Drosophila melanogaster

Sepúlveda

Shojaeian

Rauser

et al. 2008

Experimental Gerontology

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SummaryAn important aspect of the aging process in Drosophila melanogaster is the natural loss of antennae, legs, bristles, and parts of wings with age. These injuries lead to a loss of hemolymph, which contains water and nutrients. Stress-resistant lines of D. melanogaster are sometimes longer-lived than the populations from which they are derived. One hypothesis tested here is that increased stress resistance fosters longevity because it allows fruit flies to cope with the loss of hemolymph due to injury to the aging fly. We tested the effects of surgically induced injury on the aging and reproduction of five replicate populations. We then tested the effects of injury on populations that had been selected for different levels of stress resistance and on control populations. Injury affected aging more in males than in females, in part because of a counter-balancing reduction in female reproduction brought about by injury. More specifically, injury reduced female fecundity and male virility. Injury significantly reduced the starvation resistance in some groups of flies, but not in others. These findings undermine any simple interpretation of the interactions between injury, reproduction, and aging based on stress resistance. But they do indicate the existence of significant interactions between these biological processes, interactions that should be resolved in greater mechanistic detail than has been managed here. §To whom all correspondence and queries should be addressed:

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“…For example, the results of studies of wear-and-tear in insects are considered largely in the context of either aging theory [1][2][3] or age-determination technology [4][5][6][7], and only rarely in the context of fitness [8][9][10]. The literature on impairments in nonhuman vertebrates includes studies concerned with healed fractures [11,12], degenerative joint disease [13][14][15][16][17][18][19][20], broken teeth and horns [21][22][23], and either diversionary [24][25][26], compensatory [27,28], or infirmity-elicited [29,30] behaviors.…”

Section: Introductionmentioning

confidence: 99%

A search for principles of disability using experimental impairment of Drosophila melanogaster

Carey

Pinter‐Wollman

Wyman

et al. 2007

Experimental Gerontology

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The results of life table experiments to determine the effects of artificial impairment (leg amputation) in 7,500 D. melanogaster adults revealed that the extent to which life expectancy was reduced in impaired individuals was conditional on: (1) leg location and number amputated-front leg had greatest impact and the number of legs amputated directly correlated with mortality impact; (2) age of amputation-the greatest relative reduction in remaining life expectancy occurred when young flies were impaired; (3) vial orientation-mortality in impaired flies was the least when vials held upside-down (most friendly environment) and the greatest when they were right-side up (least friendly environment); and (4) sex-male mortality was reduced more than female mortality in nearly all impairment treatments. These results were used to formulate a set of general principles of disability that would apply not only to humans but to all organisms.

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Reproductive decisions are sensitive to cues of life expectancy: the case of a moth

Cited by 81 publications

References 33 publications

Senescent birds redouble reproductive effort when ill: confirmation of the terminal investment hypothesis

Senescent birds redouble reproductive effort when ill: confirmation of the terminal investment hypothesis

Interactions between injury, stress resistance, reproduction, and aging in Drosophila melanogaster

A search for principles of disability using experimental impairment of Drosophila melanogaster

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