Glaucias presentation Flashcards
How is the paradox of plankton caused
Complex biotic interactions
Phylogenetical diversity
Ever changing environment and phytoplanktonic community structure
How can we determined phytoplankton community structure
Microscopic analyses
CHEMTAX (estimates % abundance of algae based on pigment versus accessory ratios, but ratios are affected by nutrients and light)
What is the difference between Atlantic and arctic phytoplankton species
Atlantic: less stratified, warm and saline, low Si:N
Arctic: More stratisfied, cold and fresh, high Si:N
How does phytoplankton affect ecosystems
Carbon export, DMSP (cloud seeding) and cloud cover, mixotrophy, N fixation, calcium carbonate pump
What is the Redfield ration and how is it influenced
Phytoplankton composition influences element ratios even in deep waters (e.g. C:N:P = 106:16:1).
Not uniform in the oceans and depends on groups, physiology and nutrients (e.g less C:N in Atlantic waters, diatoms in Arctic =more C
What are phytoplankton functional traits and how are they influenced
Conceptual groupings of phytoplankton, which share a common ecological function. Explains phytoplankton composition by considering functional traits (such as size).
Influenced by growth, reproduction and survival
How is cell size influenced
Metabolic rate, nutrient uptake, light absorption, sinking rate, exported production, marine food web
What is the difference between Diatoms and Phaeocystis
Diatoms: invest in NPQ under continuous light
Phaeocystis: grow faster with higher PS efficiency under dynamic light
Relies heavily on D1 protein repair
What are the differences between FRRf and PAM
FRRf: more sensitive, short but intense flashes (single turnover, only reduction of Qa), measures effective absorption crosssection, more flexible
PAM: only for high biomass, multiple turnover (long flash for reduction of Qa, Qb and plastoquinone), less flexible, no cross section
How to interpret the relayability of FRRf data
Look at the slope of the saturation curve and the RsigmaPII: indicates the optimal ELED intensity to close all RC without photochemical quenching
How is the arctic ocean changing due to climate change
Higher SST (sea surface temperature), more precipiation, river flow, sea ice melting and glacier melting
Higher primary production
Atlantification (less mixing)
Less thermohaline circulation and multi year sea ice
What is the impact of climate change on ocean acidification
More CO2 = more acidic
Cold arctic water can take up more CO2
More HCO3 in the water leads to deformed shells of coccolitophores
What are the take home messages of Glaucias presentation
Biological communities are divers
Analysis of community structure is important
All approaches have good and and bad points
Understand functional role of phytoplankton
Use functional traits to understand community
Arctic change so community changes
Incorporate synergetic causes and effects
