排序方式: 共有44条查询结果,搜索用时 15 毫秒
41.
Plant growth rates and seed size: a re-evaluation 总被引:1,自引:0,他引:1
Turnbull LA Philipson CD Purves DW Atkinson RL Cunniff J Goodenough A Hautier Y Houghton J Marthews TR Osborne CP Paul-Victor C Rose KE Saner P Taylor SH Woodward FI Hector A Rees M 《Ecology》2012,93(6):1283-1289
Small-seeded plant species are often reported to have high relative growth rate or RGR. However, because RGR declines as plants grow larger, small-seeded species could achieve higher RGR simply by virtue of their small size. In contrast, size-standardized growth rate or SGR factors out these size effects. Differences in SGR can thus only be due to differences in morphology, allocation, or physiology. We used nonlinear regression to calculate SGR for comparison with RGR for 10 groups of species spanning a wide range of life forms. We found that RGR was negatively correlated with seed mass in nearly all groups, but the relationship between SGR and seed mass was highly variable. We conclude that small-seeded species only sometimes possess additional adaptations for rapid growth over and above their general size advantage. 相似文献
42.
Why do kleptobiotic spiders of the genus Argyrodes seem to be associated with spiders of the genus Nephila worldwide? Observations following introduction of experimental insect prey of different sizes and weights on to host webs revealed that: (1) small prey are more effectively retained on the web of Nephila clavipes than on the web of another common host, Leucauge venusta. (2) N. clavipes did not consume small prey that accumulated on the web whereas larger, heavier prey were enveloped and stored. (3) We observed clear partitioning of prey items between N. clavipes and Argyrodes spp.; diet selection by Argyrodes did not overlap with that of N. clavipes but closely overlapped with that of L. venusta. (4) L. venusta responds very quickly to prey impact whereas N. clavipes is slower, offering a temporal window of opportunity for Argyrodes foraging. (5) The ability of L. venusta to detect and respond to small items also means that it acts aggressively to Argyrodes spp., whereas N. clavipes does not. Consequently, food-acquisition behaviours of Argyrodes were clearly less risky with N. clavipes compared with L. venusta. We conclude that when a kleptobiotic organism has a choice of various host species, it will opt for the least risky host that presents the highest rate of availability of food items. The fact that Nephila species present such characteristics explains the worldwide association with Argyrodes kleptobiotic spiders. 相似文献
43.
Rubio-Gutierrez Juan Carlos Mendez-Hernández Pablo Guéguen Yann Galichon Pierre Tamayo-Ortiz Marcela Haupt Karsten Medeiros Mara Barbier Olivier Christophe 《Environmental science and pollution research international》2022,29(21):31042-31058
Environmental Science and Pollution Research - Bone mass in adulthood depends on growth and mineralization acquired during childhood and adolescence. It is well known that these stages of life are... 相似文献
44.
Baraket Nada Brandelet Benoît Trouvé Gwenaëlle Rogaume Yann 《Environmental science and pollution research international》2022,29(48):72639-72654
Environmental Science and Pollution Research - The objective of this work was to study the influence of temperature on the PCDD/Fs behavior stored in biomass ashes issued from an automatic... 相似文献