ENST 471 ppt6

ENST 471 ppt6 - Demystifying some terms HIEP 471 October 21...

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Demystifying some terms HIEP 471 ctober 1 and 23, 2008 October 21 and 23, 2008
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Estuarine Science • In order to understand disruption, we have to understand “normal” • Complicated terminology as the fields of arine and marine microbial ecology have marine and marine microbial ecology have evolved portant to understand the basics for our • Important to understand the basics for our further seminars and coursework
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What Do Food Webs Tell Us?
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Food whats? Food chains really do not exist in the real world Food webs function as integrators by linking a wide range of measures of ecosystem structure and function under a single descriptor Terminology differs for different fields, but lets take a stab at it….
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Terms • Primary producers=phytoplankton= (in the old days) algae • Not all algae are planktonic (kelp beds), more current terminology is to use algae where appropriate and phytoplankton (diatoms, dinoflagellates, cyanobacteria), where appropriate • All phytoplankton are algae, but not all algae are phytoplankton….
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Secondary production • Sorry to confuse you, but this is the tricky one • Heterotrophic bacteria are called secondary producers, because they are capable of remineralizing carbon and nutrients that are used at the base of the food web • Heterotrophic bacteria use the O2 produced by phytoplankton and organic matter to produce inorganic nutrients
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Consumers • Primary consumers=generally zooplankton, things like copepods, some filter feeders (larval stage rganisms), protistan grazers organisms), protistan grazers • Secondary consumers=crabs, shrimp, flounder, demersal fish, pelagic fish • Tertiary consumers=larger fish=grouper, triggerfish, striped bass uaternary consumers=sharks dolphins whales Quaternary consumers sharks, dolphins, whales, humans, tuna • Generally no hard fast rules, but in ti / i t t h i t h t estuarine/marine systems, the organisms that populate each category become generally larger and larger, and less and less numerous
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stuarine food webs and food Estuarine food webs and food chains
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Lets turn this old one on its head Sharks 4 ° cons Bigger fish 3 ° cons Fish 2 ° cons Zooplankton Nutrients 1 ° cons Phytoplankton eterotrophic & CO2 1 ° prod 2° prod Heterotrophic Bacteria Organic matter & O2
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???? Viruses are a natural component to food webs, its just that only recently did we discover that they were so important Zooplankton utrients 1 ° cons hytoplankton Nutrients & CO2 ° rod 2° prod Phytoplankton Heterotrophic Bacteria Organic matter O2
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This note was uploaded on 01/03/2009 for the course ENST 471 taught by Professor Noble,rachael during the Spring '08 term at UNC.

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ENST 471 ppt6 - Demystifying some terms HIEP 471 October 21...

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