Figs (Moracea: Ficus) and fig wasps (Hymenoptera: Chlocloids: Agaonideae) depend on each other to complete their reproduction. Monoecious fig species and their pollinating wasps are in conflict over the use of fig ov...Figs (Moracea: Ficus) and fig wasps (Hymenoptera: Chlocloids: Agaonideae) depend on each other to complete their reproduction. Monoecious fig species and their pollinating wasps are in conflict over the use of fig ovaries which can either produce one seed or one wasp. From observation on Ficus virens Ait., we showed that female flowers with outer layer of ovaries (near to the wall of syconium) had no significant difference from that with inner and interval layer of ovaries (near to the syconium cavity), in which most seeds and wasps were produced. This meant that fig tree provided the same potential resource for seed and wasps production. Observation indicated that there was usually only one foundress in syconium at female flower phase and no com- petition pollinators. Measurement of the style length of female flowers and the ovipositor of pollinators indicated that most ovaries could be reached by pollinator’s ovipositor. However, at the male flower phase, production of seeds was significantly more than that of wasps including non-pollinating wasps but there was no significant difference between seed and pollinating wasp production when without non-pollinating wasps produced. This result indicated that non-pollinating wasps competed ovaries not with seeds but with pollinating wasps for ovipositing. Bagged experiment showed that the sampling fig species was not self-sterile which was important for figs and wasps to survive bad season. Seed production in self-pollinated figs was not significantly different from total wasps in- cluding non-pollinating ones. This might be related with the weaker competition among wasps since bagged figs were not easy to reach by wasps from outside.展开更多
Since the establishment of the reserve against deposit system in China, theorists have different views about it. After analyzing some of those views, this essay proposes that presently, it is inappropriate to cancel t...Since the establishment of the reserve against deposit system in China, theorists have different views about it. After analyzing some of those views, this essay proposes that presently, it is inappropriate to cancel that system, and the rate of the required reserve should be reduced instead of being removed. With the analysis, the author points out the defects of that system, and makes a further study of that system's influence on the sustainable development of the commercial banks in China. In the last part, from several aspects, namely, the institutional environment, the rate of required reserve, the structure, and the mode of calculating and drawing money, the author offers some suggestions for the perfection of China's reserve against deposit system, and the acceleration of the sustainable development of commercial banks.展开更多
The giant panda is an icon for conservation worldwide and in China it is strictly protected by law.With continuing protection of their environment,the number and size of family groups of all wild animals in China have...The giant panda is an icon for conservation worldwide and in China it is strictly protected by law.With continuing protection of their environment,the number and size of family groups of all wild animals in China have been increasing each year,with a consequent increase in fighting for food and territory.Wild giant pandas that have been attacked by other animals,such as black bears or boars,are often found in the Wolong and Baoxing Conservation Centers for the Giant Panda(CCGP).展开更多
基金Supported by the Knowledge Innovation Research Program,Chinese Academy of Sciences (KSCX2-SW-105)
文摘Figs (Moracea: Ficus) and fig wasps (Hymenoptera: Chlocloids: Agaonideae) depend on each other to complete their reproduction. Monoecious fig species and their pollinating wasps are in conflict over the use of fig ovaries which can either produce one seed or one wasp. From observation on Ficus virens Ait., we showed that female flowers with outer layer of ovaries (near to the wall of syconium) had no significant difference from that with inner and interval layer of ovaries (near to the syconium cavity), in which most seeds and wasps were produced. This meant that fig tree provided the same potential resource for seed and wasps production. Observation indicated that there was usually only one foundress in syconium at female flower phase and no com- petition pollinators. Measurement of the style length of female flowers and the ovipositor of pollinators indicated that most ovaries could be reached by pollinator’s ovipositor. However, at the male flower phase, production of seeds was significantly more than that of wasps including non-pollinating wasps but there was no significant difference between seed and pollinating wasp production when without non-pollinating wasps produced. This result indicated that non-pollinating wasps competed ovaries not with seeds but with pollinating wasps for ovipositing. Bagged experiment showed that the sampling fig species was not self-sterile which was important for figs and wasps to survive bad season. Seed production in self-pollinated figs was not significantly different from total wasps in- cluding non-pollinating ones. This might be related with the weaker competition among wasps since bagged figs were not easy to reach by wasps from outside.
文摘Since the establishment of the reserve against deposit system in China, theorists have different views about it. After analyzing some of those views, this essay proposes that presently, it is inappropriate to cancel that system, and the rate of the required reserve should be reduced instead of being removed. With the analysis, the author points out the defects of that system, and makes a further study of that system's influence on the sustainable development of the commercial banks in China. In the last part, from several aspects, namely, the institutional environment, the rate of required reserve, the structure, and the mode of calculating and drawing money, the author offers some suggestions for the perfection of China's reserve against deposit system, and the acceleration of the sustainable development of commercial banks.
文摘The giant panda is an icon for conservation worldwide and in China it is strictly protected by law.With continuing protection of their environment,the number and size of family groups of all wild animals in China have been increasing each year,with a consequent increase in fighting for food and territory.Wild giant pandas that have been attacked by other animals,such as black bears or boars,are often found in the Wolong and Baoxing Conservation Centers for the Giant Panda(CCGP).
