Factors Controlling Plankton Ecology

David Thomas (June 20, 2011)

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Slides

0:05 Scales/marine ecology/controls/sampling
1:54 Global marine primary production
2:42 Sea ice biology/ecology is an ancient and nobel science
4:27 ...Antarctic sea ice
4:39 Ice is important for obvious...
4:51 ...and it is not just a few
5:06 ...and they are there because there is lots to eat
5:49 Supply and Demand
8:31 Space...rather an obvious one
10:07 But for the algae, bacteria and their grazers
12:39 Plants in the oceans
13:33 Many phytoplankton 10s, 100s and even 1000s
14:37 But not all...
15:34 The Bioeochemical Cycle
17:30 Photosynthesis
18:15 Photosynthesis(cont.)
19:53 Photosynthesis(cont.)
21:27 Light reaction- Quality and Quantity
25:25 Light reaction- Quality and Quantity
27:38 Measurement from Oxygen Changes
29:03 additional requirement for nitroget and phosphorous
30:29 Nitrogen a key limitation
31:52 Cycles in the ocean are complex
32:24 But not just nitrogen...
32:39 Even trace metals important...
33:23 Seasonal cycle
34:23 P vs E key to it all
34:35 What initiates the spring bloom
34:38 What initiates a phyloplankton bloom
36:40 Caution...
38:18 P vs E key to it all
38:26 Critical Depth
40:41 Critical Depth Theory
41:37 Critical depth (cont.)
43:19 Sub-surface Chlorophyll layers
44:31 Not just one algae but a succession
45:35 ...and so what is this to do with sea ice
46:26 Frozen seawater is a labyrinth of brine filled channels and pores
46:42 And within the labyrinth
47:32 But for the algae, bacteria and their grazers the scales have changed
49:38 how relevant is it for us...

Abstract

No description available.