Ecological roles of saprotrophic Peronosporales (Oomycetes, Straminipila) in natural environments

摘要: Abstract The fungus-like Peronosporales are composed of several lineages mainly biotrophic and hemibiotrophic representatives. Saprotrophic species limited to the genera Halophytophthora Salisapilia , some in Phytopythium Phytophthora Clades 6 9, which inhabit terrestrial all types aquatic ecosystems. recent discovery marine habitats freshwater indicated that these not only morphologically but also ecologically poorly delineated. In addition, half monophyletic. They play key ecological roles by upgrading nutrients higher trophic levels through colonization plant debris, makes substrata more palatable for detritivores or zoospore grazing zooplankton, although their role as saprotrophs is still largely neglected. Some can be aggressive opportunistic pathogens riverine forests presence susceptible hosts favourable environmental conditions and, a consequence, most studies have focused on pathogens. Identification challenging due hybridization complexes harbour multiple cryptic therefore, reliable without DNA sequencing tools.