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您的检索式：作者名="Geoffrey M.WHILE"
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| 1 | Multi-scale approach to understanding climate effects on offspring size at birth and date of birth in a reptile显示文摘Climate change is already impacting species around the world.Although most focus has been on the effect of temperature,changes in climatic variables other than temperature are also expected to drive biological change.Current models suggest that ectotherms,such as reptiles,will be strongly affected by climate change;however,data from natural populations are rare.Here,we use extensive data from 2 populations of a viviparous lizard(Niveoscincus ocellatus Gray,1845)at the climatic extreme of the species distribution.We examine the effects of climate at a local,a regional and a global scale(thus,integrating a suite of variables at different spatial and temporal scales)on 2 key life history traits:offspring date of birth and size at birth.Overall,our results show that across 9 years of study,local temperature had strong effects on the offspring date of birth but not on the size at birth.Therefore,a rapid increase in local temperature throughout the species range(as predicted under global warming scenarios)is likely to affect phenological processes with potential concomitant effects on offspring fitness and survival. | ChloéD.CADBY Geoffrey M.WHILE Alistair J.HOBDAY Tobias ULLER Erik WAPSTRA | 2010 | Integrative Zoology2010，5，2： | 0 |
| 2 | Oxidative stress physiology in relation to life history traits of a free-living vertebrate:the spotted snow skink,Niveoscincus ocellatus显示文摘Recent research suggests that oxidative stress,via its links to metabolism and senescence,is a key mechanism linking life history traits such as fecundity and growth with survival;however,this has rarely been put under empirical scrutiny within free-living populations.Using a wild population of live-bearing skinks,we explored how plasma antioxidant activity(OXY),reactive oxidative metabolites(ROM),and the estimated oxidative stress index are associated with female and male life history.We found that male skinks have a significantly higher ROM and estimated oxidative stress index than female skinks,but this was not accompanied by a sex difference in mortality.Both sexes showed a non-linear association between OXY and age,indicating that the oldest and youngest individuals had the lowest OXY.Interestingly,female skinks with high OXY showed a decreased probability of survival to the following season.However,we found no significant associations between female reproductive investment(litter size or litter mass)or parturition date(i.e.metabolism)and oxidative status.Combined,our results offer mixed support for a role of oxidative stress in mediating life history traits and suggest that future studies need to explore oxidative stress during vitellogenesis in addition to using an intra-individual approach to understand the cost of reproduction and patterns of aging. | Caroline ISAKSSON Geoffrey M.WHILE Mats OLSSON Jan KOMDEUR Erik WAPSTRA | 2011 | Integrative Zoology2011，6，2： | 0 |
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