@article{HennenbergFischerKouadioetal.2006,
  author    = {Hennenberg, K. J. and Fischer, Franka and Kouadio, K and Goetze, D and Orthmann, B and Linsenmair, KE and Jeltsch, Florian and Porembski, Stefan},
  title     = {Phytornass and fire occurrence along forest-savanna transects in the Comoe National Park, Ivory Coast},
  issn      = {0266-4674},
  doi       = {10.1017/S026646705003007},
  year      = {2006},
  abstract  = {In tropical West Africa, distribution patterns of forest islands in savannas are influenced by fires which occur regularly in the grass stratum. Along continuous forest-savanna transects in the Comoe National Park, the change in the amount and composition of non-woody phytomass was investigated from savanna to forest interior. This was correlated with the cover of vegetation strata above, soil depth, and the occurrence of seasonal surface fires. Phytomass mainly consisted of leaf litter in the forests (about 400 g m(-2) at the end of the rainy season, and about 600 g m(-2) at the end of the dry season) and of grasses in the savanna (about 900 g m(-2)). Low grass biomass appeared to be primarily the result of suppression by competing woody species and not of shallow soil. The occurrence of early dry-season fires seemed to be determined mainly by the amount of grass biomass as fuel because fires occurred in almost all savanna plots while forest sites remained unaffected. However, late dry-season fires will encounter higher amounts of leaf litter raising fire probability in forests. Due to the importance of the amount of combustible phytomass, fire probability and intensity might increase with annual precipitation in both savanna and forest},
  language  = {en}
}
@article{HobbhahnKuechmeisterPorembski2006,
  author    = {Hobbhahn, Nina and K{\"u}chmeister, Heike and Porembski, Stefan},
  title     = {Pollination biology of mass flowering terrestrial Utricularia species (Lentibulariaceae) in the Indian Western Ghats},
  series = {Plant biology},
  volume    = {8},
  journal   = {Plant biology},
  number    = {6},
  publisher = {Wiley-Blackwell},
  address   = {Oxford},
  issn      = {1435-8603},
  doi       = {10.1055/s-2006-924566},
  pages     = {791 -- 804},
  year      = {2006},
  abstract  = {The pollination biology of three mass flowering Utricularia species of the Indian Western Ghats, U. albocaerulea, U. purpurascens, and U. reticulata, was studied for the first time by extensive observation of flower visitors, pollination experiments, and nectar analyses. The ephemerality of the Utricularia habitats on lateritic plateaus, weather conditions adverse to insects, lack of observations of flower visitors to other Utricularia spp., and the predominance of at least. facultative autogamy in the few Utricularia species studied so far suggested that an autogamous breeding system is the common case in the genus. In contrast, we showed that the studied populations are incapable of autonomous selfing, or that it is an event of negligible rarity, although P/O was similarily low as in autogamous species investigated by other authors. In all three species the spatial arrangement of the reproductive organs makes an insect vector necessary for pollen transfer between and within flowers. However, U. purpurascens and U. reticulata are highly self-compatible, which allows for visitor-mediated auto-selfing and geitonogamy on inflorescence and clone level. Floral nectar is present in extremely small volumes in all three species, but sugar concentrations are high. More than 50 species of bees, butterflies, moths, hawk moths, and clipterans were observed to visit the flowers, and flower morphology facilitated pollination by all observed visitors. The results are discussed in the context of the phenological characteristics of the studied species, especially the phenomenon of mass flowering, and the environmental conditions of their habitats.},
  language  = {en}
}