Pollination Crisis? - Pollination limitation of Passiflora edulis Sims f. flavicarpa Degner in Bahia, Brazil : 9783639028164 : 28 May 2008 : Animal pollination of plants represents a critical ecosystem service of great value to humanity. Almost all flowering plant species of tropical rain forests are animal-pollinated and one-third of the human diet in tropical countries is derived from insect-pollinated plants, so the worldwide decline in pollinators has potential consequences for the stability of crop yields. Pollination systems - such as Passiflora edulis plantations in north-eastern Brazil - are under increasing threat from anthoprogenic effects, including fragmentation of habitat, changes in land use, modern agricultural intensification, use of chemicals such as pesticides and herbicides, and invasions of non-native plants and animals. Anne-Katrin Bogdanski determined whether the observed passion fruit fields were affected by pollination limitation and the possible reasons why th