LEARNING ASSIGNMENT 5
Phytoplankton, Zooplankton and the Food Chain
By Annie Carman
Presented to Mrs. Miller
John Abbott College
Science and knowledge
April 7th 2013
LEARNING ASSIGNMENT #5
Due date: the first day you have class in week 11.
Days you have class: ____________________
Point-form answers under the questions. Source all information. Do not cut and paste; paraphrase.
□ Are you doing this as an individual only?
□ Are you doing this as a part of a group?
If you are providing a combined answer as part of a group effort, list the full name of each student:
10) When Oceans Get Warmer; Carbon Dioxide Uptake by Marine Plankton May Be Reduced
Experiments on plankton’s communities depend on biological factors. The process happens when atmospheric CO2 enters the ocean at the sea surface. It allows for continued uptake, it has to be transported to deeper layers. Researchers have surrounded planktons communities in big tanks of 1400 litres each to see how this system will be modify in response to surface-ocean warming. The researchers were very surprised to find out that the plankton would consume up to one third less CO2 at a high temperature. This causes a fading of carbon pump.
'Black Box' plankton found to have huge role in ocean carbon fixation/plankton assignment
Carbon fixation by phytoplankton plays a huge role in the global carbon cycle located in the open ocean but scientists have not fully understood it. Their thesis is that cyanobacteria are over accounted for the phytoplankton’s role in carbon fixation. Researchers discovered that eukaryotic phytoplankton has a big amount of carbon, 44% of the total of contribution. Small eukaryotic phytoplanktons are obtaining carbon by feeding bacteria’s, supplementing carbon through photosynthesis.
Climate Change Reduces Nutritional Value Of Algae
The composition of algae is changing therefore micro-algae are growing much faster under some climate change influence. As we know, algae are at the bottom of the food chain which is affected by the climate change of underwater life. Scientists wanted to know if the increase of CO2 underwater could affect the concentration exerted. The experiment was made on freshwater micro-algae such as small and mostly unicellular algae. The experiment was controlled in large tanks and the air was also controlled. As a result, the micro-algae grew faster with a higher concentration of CO2. Researchers will examine the effects of reducing nutritional value that the algae can have on ecosystems.
Bering Sea chill yields fatter plankton, pollock diet changes
Due to the 3 last years of cold water temperature, scientists have found that it would have helped for the Zooplankton to reproduce in the Bering Sea. The younger of the Pollock tend to eat the smaller planktons while the larger one prefer the larger plankton found in the cold water. As a result, young Pollock start living as well in warmer temperatures but as they grow bigger they are not able to find they prey they need to survive and produce enough fat.
14) Zooplankton main fare for Arctic cod, marine birds and bowhead whales
Eutrophication Affects Diversity Of Algae
Phytoplankton are the basic of the marine food chain, they are more common in coastal areas, from the polar regions to the Equator. Researchers of the University of...
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