University:
York University
Course:
SC/BIOL 2021 | Cell Biology
Academic year:

2019
Views:

175

Pages:

3
Author:

Nick T.

1/30/19 Not reading will not tell you what's important mineralization. Animals digest: morphous particles. microbes A-leeching - Amphorous particles. 1 DOM+ POM = Marine Snow decomp. quickly dissapates into surrounding water during Particulate O.M. = tiny that is floating around. POM importance = eaten by oysters and scallops Shrimp and copepods can also eat a POM. aPom could supplement but not replace food. Detritus = dead stuff. Sea cucumbers = ocean earthworms. "Shredders" = crabs "deposit feeders" = but IN the deposit. Dead Plants are high in carbon, but low in Other nutrients, but Cis cellulose. nitrogen and ↳ Lignin = heavy-duty carbon compound = not mamy. could digest lignin. Not a good food. Source. The Dual Food Chain = Figure 3.12. Basically, the photosynthesis Food chain contrib- utes to the detritus Food chain. Marine Viruses = 20 to 200 nm Lytic and Lysogenic cycles (p.110). Infect most marine organism. • Kill-the-Winner Hypothesis Marine Prokaryote Decomposers. Organotrophs - Chemolithotrophs - Nitrifying Prok's - Bacteria: Growth rate vs Mortality Rate. Bacteria doesn't die of old age. So they get killed, and never "die". Ecotypes: K-(good competitors), r- (exploiters). Bacterias can have complex communities. Microscopic Eukaryotes. Protozoa = unicellular Autotropnic Metazoa = multicellular larval zooplankton. Reynold's Number low = harder to move. Getting nutrition through diffusion (DOM) takes less energy than trying to "Sweep" it in (POM). * As Size increases, getting nutrition goes from diffu- sion to filter Feeding. are not equally distributed. Microrganisms Heterotrophic bacteria eat organic material. Top-down control Bottom-up control The Law of Minimum Resources limit Abundance. Winter Summer The Marine Snow influences the global nutrient supply AND climate. Solubility Pump = controls CO₂ dissolubility and Ocean Circulation. Biological Pump = controls microbial production and consumption of organic matter.