Dynamics of the different phases of life cycle of <i>Rhizosiphon crassum</i>.

<p>Dynamics of the three different phases of the life cycle of the chytrid <i>Rhizosiphon crassum</i> infecting the cyanobacterium <i>Anabaena macrospora</i> at 0.5 m (A) and in the depth of maximum chlorophyll (MF) (B) in Lake Aydat, September 6^th to October 30^th 2010. The three phases regroup the six stages of life as above: Young phase (Stages 1 and 2), Maturation phase (Stages 3, 4 and 5) and Empty phase (Stage 6) (see the main text for details). Vertical lines mark the transition point between the increasing and the decreasing phases in the prevalence of infection of filaments (PrF), at 0.5 (dark dashed line) and MF (grey dashed line) depths.</p

Life cycles of the two chytrid species.

<p>The six different life stages of the two chytrid species, <i>Rhizosiphon crassum</i> (A) and <i>Rhizosiphon akinetum</i> (B) parasitizing the cyanobacterium <i>Anabaena macrospora</i> from the productive Lake Aydat: Stage1 : Encystment; Stage 2 : Prosporangium; Stage 3 : Expansion stage; Stage 4 : Budding; Stage 5 : Mature stage; Stage 6 : Empty stage. The six life stages were grouped into three different phases: Young phase (Stages 1 and 2), Maturation phase (Stages 3, 4 and 5) and Empty phase (Stage 6). Prosporangium (P) and Papilla (Pa).</p

Dynamics of host and chytrid parasitism parameters.

<p>Changes in the density of <i>Anabaena macrospora</i> total cells (A), cells per filament (B) and akinetes (E), and in the prevalences of infection of <i>A. macrospora</i> cells (C, PrC), filaments (D, PrF), akinetes (F, PrAK), and of cells in infected filaments (G, PrCF) at 0.5 m and in the depth of maximum chlorophyll (MF) in Lake Aydat, September 6^th to October 30^th 2010. Vertical lines mark the transition point between the increasing and the decreasing phases in the prevalence of infection of filaments (PrF), at 0.5 (dark dashed line) and MF (grey dashed line) depths.</p