The effects of nutritional and social environment on ovarian dynamics and life history strategy in Nauphoeta cinerea

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The effects of nutritional and social environment on ovarian dynamics and life history strategy in Nauphoeta cinerea

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dc.contributor.author Barrett, Emma Louise Beverley en_GB
dc.date.accessioned 2009-08-05T13:27:37Z en_GB
dc.date.accessioned 2011-01-25T16:57:34Z en_US
dc.date.accessioned 2013-03-21T10:54:47Z
dc.date.issued 2009-01 en_GB
dc.description.abstract The trade-off between gametes and soma is central to life-history evolution. Oosorption has been proposed as a mechanism that can mediate this trade-off. When conditions are not conducive to successful reproduction, females are expected to be able to recoup nutrients from unfertilized oocytes and reinvest them into the somatic processes that promote survival and hence future reproduction. Although positive correlations between oocyte degradation and lifespan have been documented in oviparous insects, the adaptive significance of this process in species with more complex reproductive biology has not been explored. Oocyte degradation via apoptosis (programmed cell death) occurs in response to enforced virginity in females of the ovoviviparous cockroach, Nauphoeta cinerea. Observed apoptosis may represent oosorption, however, an alternative but not mutually exclusive argument is that oocyte apoptosis may represent oocyte ageing and clearance in order to maintain reproductive synchrony. The aim of this thesis was to test the hypothesis that the function of oocyte apoptosis is oosorption in N. cinerea. I found that in addition to enforced virginity, starvation induces oocyte apoptosis. However, the life history outcome following one form of stress is the opposite of the other. Hence, the functional role of oocyte apoptosis appears to be different depending on whether apoptosis is induced through starvation or age. Following a period of starvation-induced apoptosis females exhibit the increase in survival and future reproduction predicted by oosorption. Whereas, following a period of age-induced apoptosis females suffer fecundity and longevity cuts. However, age-induced apoptosis does not appear to simply be cellular ageing and clearance. In conjugation with age-induced apoptosis, ovariole number declines whilst the size of surviving oocytes increases. Hence, it appears that resources from sacrificed oocytes are being recycled into the survivors, and that this reinvestment in current reproduction trade-offs with future reproductive capacity. My thesis shows the importance of studying proximal mechanisms alongside more traditional measures of life history, as the relationship between isolated biological levels is not always clear. en_GB
dc.description.sponsorship NERC en_GB
dc.identifier.citation Barrett, E. L. B., Preziosi, R. F., Moore, A. J. & Moore, P. J. (2008) Effects of mating delay and nutritional signals on resource recycling in a cyclically breeding cockroach. Journal of Insect Physiology 54, 25-31. en_GB
dc.identifier.citation Barrett, E. L. B., Moore, A. J. & Moore, P. J. (2009) Diet and social conditions during sexual maturation have unpredictable influences on female life history trade-offs. J. Evol. Biol. 22(3):571-581 en_GB
dc.identifier.citation Barrett, E. L. B., Hunt, J., Moore, A. J. & Moore, P. J. (Published online ahead of press) Separate and combined effects of nutrition during juvenile and sexual development on female life-history trajectories: the thrifty phenotype in a cockroach. Proc. Roy. Soc. B., June 24, 2009, doi: 10.1098/rspb.2009.0725 en_GB
dc.identifier.citation Barrett, E. L. B., Moore, A. J. & Moore, P. J. (In Press) Does the scent of a potential mate prevent the resorption. Insect Science (DOI 10.1111/j.1744-7917.2009.01276.x) en_GB
dc.identifier.citation Barrett, E.L.B., Moore, A.J. and Moore, P.J. (In Press) A potential function for oocyte apoptosis in Nauphoeta cinerea. Physiological Entomology. en_GB
dc.identifier.uri http://hdl.handle.net/10036/76373 en_GB
dc.language.iso en en_GB
dc.publisher University of Exeter en_GB
dc.rights.embargoreason The majority of this thesis is published, or is in press. Journal of Evolutionary Biology, Proceedings of the Royal Society B and Physiological Entomology allow authors to have copyright and allow publishing of work elsewhere after a period of time (for JEB after 6 months (Aug 2009), for Proceedings 12 months (June 2010), and for Physiological Entomology 12 months (it is still in press). Journal of Insect Physiology and Insect Science retain copyright, therefore only links can be made to those sites. en_GB
dc.rights Journal of Insect Physiology (http://www.elsevier.com/wps/find/authorsview.authors/copyright#whatrights); Journal of Evolutionary Biology (http://www.blackwellpublishing.com/jeb_enhanced/submit.asp); Proceeding of the Royal Society B (http://royalsocietypublishing.org/site/authors/policy.xhtml); Insect Science (http://www.wiley.com/bw/submit.asp?ref=1672-9609); Physiological Entomology (http://www.wiley.com/bw/submit.asp?ref=0307-6962&site=1) en_GB
dc.subject Life history en_GB
dc.subject Trade offs en_GB
dc.subject Nauphoeta cinerea en_GB
dc.subject Oosorption en_GB
dc.subject Aging en_GB
dc.subject Starvation en_GB
dc.subject zVAD.fmk en_GB
dc.subject Apoptosis en_GB
dc.subject Ovary en_GB
dc.subject Oocyte en_GB
dc.subject Ovariole number en_GB
dc.subject Pheromones en_GB
dc.title The effects of nutritional and social environment on ovarian dynamics and life history strategy in Nauphoeta cinerea en_GB
dc.type Thesis or dissertation en_GB
dc.date.available 2009-08-05T13:27:37Z en_GB
dc.date.available 2011-01-25T16:57:34Z en_US
dc.date.available 2013-03-21T10:54:47Z
dc.contributor.advisor Moore, Patricia J en_GB
dc.contributor.advisor Moore, Allen J en_GB
dc.publisher.department School of Biosciences en_GB
dc.type.degreetitle PhD in Biological Sciences en_GB
dc.type.qualificationlevel Doctoral en_GB
dc.type.qualificationname PhD en_GB


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