Lecture 16

Question 1

Def(community structure)

Answer 1

describes which organisms are present in a given environment, in what numbers, and how they related to each other

Question 2

Def(food web)

Answer 2

a graphical representation of feeding relationships in a community

Question 3

food web

Answer 3

primary producer, primary consumer, secondary consumer, tertiary consumer

omnivory, trophic position

Question 4

E

Answer 4

90% E lost as entropy with each tropic connection
take E to catch, eat, digest
E lost as heat

Question 5

determine feeding relationship

Answer 5

direct observation, eg.giant water bug, baby turtle
gut or stomach content analysis, eg.sword fish, tuna
stable isotope analysis of tissue, N15(predator)=3/1000+N15(prey)

Question 6

represent food web

Answer 6

connectence web
energy web, arrow show flow of E
interaction web, arrow show direction of interaction

Question 7

features related to food web

Answer 7

connectedness=how linky a food web is=mean of link per species
more species, more linkage b/c more involved
food chain length=number of links from top to basal species
central tendency in food chain length

Question 8

limitation of food chain length

Answer 8

E
productive space