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Spatial and temporal changes of parasitic chytrids of cyanobacteria
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Spatial and temporal changes of parasitic chytrids of cyanobacteria
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Spatial and temporal changes of parasitic chytrids of cyanobacteria
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Journal Article
Spatial and temporal changes of parasitic chytrids of cyanobacteria
2017
Overview
Parasitism is certainly one of the most important driving biotic factors of cyanobacterial blooms which remains largely understudied. Among these parasites, fungi from the phylum Chytridiomycota (i.e. chytrids) are the only eukaryotic microorganisms infecting cyanobacteria. Here, we address spatiotemporal dynamics of the cyanobacterial host
Dolichospermum macrosporum
(
syn. Anabaena macrospora
) and its associated chytrid parasites,
Rhizosiphon
spp., in an eutrophic lake by studying spatial (vertical, horizontal) and temporal (annual and inter-annual) variations. Our results show homogenous chytrid infection patterns along the water column and across sampling stations. However, the prevalence of infection presented drastic changes with time, at both intra- and inter-annual scales. In 2007, a maximum of 98% of vegetative cells were infected by
R. crassum
whereas this fungal species was not reported seven years later. In opposite,
R. akinetum
, a chytrid infecting only akinetes, increased its prevalence by 42% during the same period. High chytrid infection rate on the akinetes might have sizeable consequences on host recruitment (and proliferation) success from year to year, as supported by the recorded inter-annual host dynamics (affecting also the success of other chytrid parasites). The spatial homogenous chytrid infection on this cyanobacterium, coupled to both seasonal and inter-annual changes indicates that time, rather than space, controls such highly dynamic host-parasite relationships.
