The evolution of long corolla tubes has been hypothesized to be driven by long-tongued pollinators.Corolla tubes in Pedicularis species can be longer than 10 cm which may function as flower stalks to increase visual a...The evolution of long corolla tubes has been hypothesized to be driven by long-tongued pollinators.Corolla tubes in Pedicularis species can be longer than 10 cm which may function as flower stalks to increase visual attractiveness to pollinators because these species provide no nectar and are pollinated by bumblebees. The corolla tube length was manipulated（shorter or longer） in two Pedicularis species in field to examine whether longer tubes are more attractive to pollinators and produce more seeds than short tubes. Our results did not support the pollinator attraction hypothesis, leaving the evolution of long tubes in Pedicularis remains mysterious.展开更多
Ⅰ. GENERAL CONDITION Situated on the northern slope of Daxue Mountain (大雪山) in the western part of Qilian Mts., Glacier No. 12 of Laohugou (老虎沟) is the longest valley glacier, covering an area of 21.45 km^2 wit...Ⅰ. GENERAL CONDITION Situated on the northern slope of Daxue Mountain (大雪山) in the western part of Qilian Mts., Glacier No. 12 of Laohugou (老虎沟) is the longest valley glacier, covering an area of 21.45 km^2 with 10 km in length. Its physical property is of significance in the continental glaciers of China. In 1959—62, the first Glacier Location Observa-展开更多
基金National Science Foundation of China (No. 31270281) to SQH supported this work
文摘The evolution of long corolla tubes has been hypothesized to be driven by long-tongued pollinators.Corolla tubes in Pedicularis species can be longer than 10 cm which may function as flower stalks to increase visual attractiveness to pollinators because these species provide no nectar and are pollinated by bumblebees. The corolla tube length was manipulated（shorter or longer） in two Pedicularis species in field to examine whether longer tubes are more attractive to pollinators and produce more seeds than short tubes. Our results did not support the pollinator attraction hypothesis, leaving the evolution of long tubes in Pedicularis remains mysterious.
文摘Ⅰ. GENERAL CONDITION Situated on the northern slope of Daxue Mountain (大雪山) in the western part of Qilian Mts., Glacier No. 12 of Laohugou (老虎沟) is the longest valley glacier, covering an area of 21.45 km^2 with 10 km in length. Its physical property is of significance in the continental glaciers of China. In 1959—62, the first Glacier Location Observa-
