caa a22 4500 445894245 CHVBK 20180317145626.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10750-010-0274-z doi (NATIONALLICENCE)springer-10.1007/s10750-010-0274-z Parasitic chytrids could promote copepod survival by mediating material transfer from inedible diatoms [Elektronische Daten] [Maiko Kagami, Nico Helmsing, Ellen van Donk] Diatoms form large spring blooms in lakes and oceans, providing fuel for higher trophic levels at the start of the growing season. Some of the diatom blooms, however, are not grazed by filter-feeding zooplankton like Daphnia due to their large size. Several of these large diatoms are susceptible to chytrid infections. Zoospores of chytrids appeared to be excellent food for Daphnia, both in terms of size, shape, and quality (PUFAs and cholesterol). Thus, zoospores of chytrids can bridge the gap between inedible diatoms and Daphnia. In order to examine the effects of diatoms and chytrids on the survival of copepods, we performed one grazing and one survival experiment. The grazing experiment revealed that the diatom, Asterionella formosa, was not grazed by the copepod, Eudiaptomus gracilis, even after being infected by the chytrid Zygorhizidium planktonicum. However, carbon and nitrogen concentrations were significantly reduced by E. gracilis only when A. formosa was infected by Z. planktonicum, indicating that the chytrids might facilitate material transfer from inedible diatoms to the copepods. The survival experiment revealed that E. gracilis lived shorter with A. formosa than with the cryptophyta Cryptomonas pyrenoidifera. However, the survival of E. gracilis increased significantly in the treatment where A. formosa cells were infected by Z. planktonicum. Since E. gracilis could not graze A. formosa cells due to their large colonial forms, E. gracilis may acquire nutrients by grazing on the zoospores, and were so able to survive in the presence of the A. formosa. This provides new insights into the role of parasitic fungi in aquatic food webs, where chytrids may improve copepod survival during diatom blooms. Springer Science+Business Media B.V., 2010 Parasite nationallicence Food web nationallicence Chytrid nationallicence Eudiaptomus nationallicence Mycoloop nationallicence Kagami Maiko Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Rijksstraatweg 6, 3631 AC, Nieuwersluis, The Netherlands aut Helmsing Nico Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Rijksstraatweg 6, 3631 AC, Nieuwersluis, The Netherlands aut van Donk Ellen Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Rijksstraatweg 6, 3631 AC, Nieuwersluis, The Netherlands aut Hydrobiologia Springer Netherlands 659/1(2011-01-01), 49-54 0018-8158 659:1<49 2011 659 10750 https://doi.org/10.1007/s10750-010-0274-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0274-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kagami Maiko Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Rijksstraatweg 6, 3631 AC, Nieuwersluis, The Netherlands aut NATIONALLICENCE 700 1- Helmsing Nico Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Rijksstraatweg 6, 3631 AC, Nieuwersluis, The Netherlands aut NATIONALLICENCE 700 1- van Donk Ellen Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Rijksstraatweg 6, 3631 AC, Nieuwersluis, The Netherlands aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 659/1(2011-01-01), 49-54 0018-8158 659:1<49 2011 659 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer