19_microbial_processes_1

19_microbial_processes_1 - Marine Microbial Processes I...

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Marine Microbial Processes I
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Outline Friday (Today) • A brief history of the development of our current understanding of the abundance and function of microbes in marine food webs Monday • The role of microbial processes in carbon cycling within marine food webs • evolving concepts
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As a general rule, the preferred prey size is approximately 1/10 of consumer size Other than chlorophyll, size determines almost everything about an organism’s role in the community of pelagic organisms 1. It determines who it will eat (all organisms 1/10 its own size) 2. It determines who will eat it (all organisms 10 times bigger than it) Marine Food Webs are Said to be Strongly Size-Structured!
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Trophic Pyramid
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Optimal Prey Size (1:10) of Pelagic Animals is a Valid General Rule for Even the Smallest Pelagic Organisms (Protozoans and Bacteria)
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Traditional Food Chain Concept (early1970’s) Note: organisms are placed into a given Trophic Level based on Autotroph versus Heterotrophic (i.e., chlorophyll versus no chlorophyll) and on the organism’s size
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Traditional Bacterial Concentrations Estimated from Transmission Light Microscopy and Culture-Plate Colony Counts
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19_microbial_processes_1 - Marine Microbial Processes I...

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