全文获取类型
收费全文 | 408篇 |
免费 | 35篇 |
专业分类
443篇 |
出版年
2023年 | 3篇 |
2022年 | 1篇 |
2021年 | 6篇 |
2020年 | 4篇 |
2019年 | 5篇 |
2018年 | 9篇 |
2017年 | 6篇 |
2016年 | 16篇 |
2015年 | 14篇 |
2014年 | 15篇 |
2013年 | 28篇 |
2012年 | 17篇 |
2011年 | 31篇 |
2010年 | 14篇 |
2009年 | 14篇 |
2008年 | 27篇 |
2007年 | 22篇 |
2006年 | 23篇 |
2005年 | 16篇 |
2004年 | 21篇 |
2003年 | 8篇 |
2002年 | 15篇 |
2001年 | 19篇 |
2000年 | 9篇 |
1999年 | 8篇 |
1998年 | 9篇 |
1997年 | 5篇 |
1996年 | 6篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1992年 | 7篇 |
1991年 | 4篇 |
1990年 | 9篇 |
1989年 | 7篇 |
1988年 | 6篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 8篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1981年 | 1篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1971年 | 1篇 |
1969年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有443条查询结果,搜索用时 0 毫秒
441.
442.
443.
Jorge F. Henriques Maringeles Lacava Celeste Guzmn Maria Pilar Gavín-Centol Dolores Ruiz-Lupin Eva De Mas Sara Magalhes Jordi Moya-Larao 《Heredity》2021,126(4):684
The relative body size at which predators are willing to attack prey, a key trait for predator-prey interactions, is usually considered invariant. However, this ratio can vary widely among individuals or populations. Identifying the range and origin of such variation is key to understanding the strength and constraints on selection in both predators and prey. Still, these sources of variation remain largely unknown. We filled this gap by measuring the genetic, maternal and environmental variation of the maximum prey-to-predator size ratio (PPSRmax) in juveniles of the wolf spider Lycosa fasciiventris using a paternal half-sib split-brood design, in which each male was paired with two females and the offspring reared in two food environments: poor and rich. Each juvenile spider was then sequentially offered crickets of decreasing size and the maximum prey size killed was determined. We also measured body size and body condition of spiders upon emergence and just before the trial. We found low, but significant heritability (h2 = 0.069) and dominance and common environmental variance (d2 + 4c2 = 0.056). PPSRmax was also partially explained by body condition (during trial) but there was no effect of the rearing food environment. Finally, a maternal correlation between body size early in life and PPSRmax indicated that offspring born larger were less predisposed to feed on larger prey later in life. Therefore, PPSRmax, a central trait in ecosystems, can vary widely and this variation is due to different sources, with important consequences for changes in this trait in the short and long terms.Subject terms: Evolutionary biology, Behavioural ecology, Heritable quantitative trait, Evolutionary ecology 相似文献