Differences

This shows you the differences between two versions of the page.

--- 2020:groups:g2:start [2019/12/16 20:10] – [Introduction] rillo
+++ 2020:groups:g2:start [2024/01/09 18:45] (current) – external edit 127.0.0.1
@@ Line 2: / Line 2: @@
 **Group 2**
-<html><font size=6 face="Arial">Mycoloop: tasty parasites</font></html>
+<html><font size=6 face="Arial">Tasty parasites</font></html>
@@ Line 12: / Line 12: @@
 ===== Introduction =====
-Trophic interactions between phytoplankton (primary producers) and zooplankton (consumers) govern the flow of energy in marine systems. //Planktothrix agardhii// is an abundant marine cyanobacteria. This small phytoplankton displays resistance to grazing by zooplankton such as //Daphnia galeata// because of its filamentous morphology, production of toxins and low nutritional value. However, //Planktothrix// can be infected and killed by the obligate parasite //Rhizophydium megarrhizum//, a chytrid fungus. These parasitic fungi, in turn, have a free-living zoosporic stage that is highly nutritional and an important food source for zooplankton. Thus, parasitic //Rhizophydium// fungi create an important trophic link between cyanobacteria and zooplankton termed the "mycoloop".
-Additionally, when //Planktothrix// are infected by //Rhizophydium//, their morphology and nutritional value change and, consequently, they become more edible to //Daphnia//.
+{{http://media.nordicmicroalgae.org/large/Planktothrix%20agardhii_1.jpg?100  |Planktothrix agardhii}} Trophic interactions between phytoplankton (primary producers) and zooplankton (consumers) govern the flow of energy in aquatic systems. //Planktothrix agardhii// is an abundant aquatic cyanobacteria that can form algal blooms in freshwater lakes.
-**(to be continued)**
+{{  https://upload.wikimedia.org/wikipedia/commons/4/4e/Daphnia_pulex.png?100|Daphnia sp.}}  This small phytoplanktonic species displays resistance to grazing by zooplankton such as //Daphnia galeata// because of its filamentous morphology, production of toxins and low nutritional value. However, //Planktothrix// can be infected and killed by the obligate parasite //Rhizophydium megarrhizum//, a chytrid fungus. These parasitic fungi, in turn, have a free-living stage that is highly nutritional and an important food source for zooplankton. Thus, parasitic //Rhizophydium// fungi create an important trophic link between cyanobacteria and zooplankton termed the "//mycoloop//" (Agha et al. 2016).
+{{:2020:groups:g2:polycentric-chytrid-feeding-on-filamentous-cyanobacteria-after-karling-1977.png?150 |Chytrid fungi feeding on filamentous cyanobacteria, Karling, J.S. (1977) Chytridiomycetarium Iconographia.}}Additionally, when //Planktothrix//  cells are infected by //Rhizophydium//, their morphology and nutritional value change and, consequently, they become more edible to //Daphnia//. This way, //Rhizophydium// infection facilitates the grazing of //Planktothrix// by //Daphnia//, further strengthening the trophic link between phytoplankton and zooplankton.
 ===== Assignment =====
 Propose and analyse a mathematical model that describes the trophic dynamics among cyanobacteria (primary producer/host), chytrids (parasite/prey) and zooplankton (grazer/predator).
-===== Questions & Suggestions =====
+===== Suggested questions =====
+  - Under what conditions can cyanobacteria, chytrid fungi and zooplankton coexist?
+  - Under what conditions do cyanobacteria blooms form?
+Further well-grounded questions from the group are welcome.
-(1) Under what conditions can cyanobacteria, chytrids and zooplankton coexist? \\
-(2) Under what conditions do cyanobacteria blooms form?
 ===== References =====
-R. Agha, M. Saebelfeld, C. Manthey, T. Rohrlack and J. Wolinska. (2016) Chytrid parasitism facilitates trophic transfer between bloom-forming cyanobacteria and zooplankton (Daphnia). Scientific Reports 6:35039 DOI: [[https://www.doi.org/10.1038/srep35039|10.1038/srep35039]].
+T. Frenken  et al. (2017) Integrating chytrid fungal parasites into plankton ecology: research gaps and needs. Environ Microbiol, 19: 3802-3822. DOI: [[https://doi.org/10.1111/1462-2920.13827|10.1111/1462-2920.13827]]
+R. Agha, M. Saebelfeld, C. Manthey, T. Rohrlack and J. Wolinska. (2016) Chytrid parasitism facilitates trophic transfer between bloom-forming cyanobacteria and zooplankton (//Daphnia//). Scientific Reports 6:35039 DOI: [[https://www.doi.org/10.1038/srep35039|10.1038/srep35039]]. \\