A positive correlation between naturally captured prey, growth and flowering in drosera-intermedia in 2 contrasting habitats
Faculty of Sciences. Biology
Bulletin de la Société royale de botanique. - Bruxelles, 1862 - 1989
, p. 33-40
University of Antwerp
The effect of naturally caught insects, measured as the number of prey caught over the whole growing season, on growth and flowering of the carnivorous plant Drosera intermedia Hayne was investigated in four populations in two different heathland habitats : (1) a path through the wet heath where the plants root in a podzol, (2) a seepage area where plants root in a peaty soil or among Sphagnum. There was a positive correlation between vegetative growth during the growing season 1987 and the number of prey caught that season in all populations. No relationship between prey number and next year's vegetative growth was found. The number of prey caught in May and June 1987 was positively related to the probability to flower that year in the path populations (trend in the seepage area). The number of prey caught between May and August 1987 was positively related to flowering the following year in the seepage area, but not in the path populations. Overall, the data show that D. intermedia in the two contrasting habitats, benefits from insect prey both in terms of vegetative growth and flowering.