Drosera anglica is a rare carnivorous plant that is well-adapted to waterlogged and nutrient-poor environments in wetlands. This species is a weak competitor in nutrient-habitat. The species is threatened, and is assigned a vulnerable species in Red Data Book of Japan.
Although peat mining had been conducted for about 30 years in Sarobetsu mire, D.anglica populations are established with a common species, D.rotundifolia. The sizes of D.anglica populations are larger than those of any other populations in un-mined Sarobetsu mire. My questions are (1$B!K(BWhy is D.anglica more difficult to maintain the populations than D.rotundiforia? (2) Are these D.anglica populations able to persist?
To answer the questions, basic information on growth, survivorship and reproduction is required. I will compare the two species to characterize life history traits of D.anglica and to find out favorable habitats for the persistence of D.anglica population. In 2008, I measured seed productivity and germination rate that were not greatly different between two species. So I will confirm these in 2009, by field observations and lab-experiments. In this seminar, I will introduce the previous reports about new knowledge of carnivorous plants, effects of competition on carnivorous plants, and my idea on researches in this year.