First hour exam ID: eee105 Password: prAIRie Friday Feb 8 noon here 100 points(of 500 for semester) 29 questions57 bubbles TEST REVIEW If University-approved conflict Sign up with Karin Nelson by Wednesday’s lecture Wed. Feb 6 Conflict Exam 5-7pm 100 Gregory

EEE Question Formats: Multiple True-False Multiple choice

EEE (MC) Plants and animals are absolutely identical in the way they ____________. A. obtain energy B. respire C. apportion energy between their necessary life activities D. reproduce E. obtain nutrients Multiple choice

EEE 105 T F F T T Multiple True-False

Population Ecology EEE ID: eee105 Password: prAIRie Chapter 6

limiting factors density-dependent

limiting factors density-dependent

Predation regulates prey populations predation is “good” for the prey removes old, diseased, young density-dependent

Predation regulates prey populations predation is “good” for the prey removes old, diseased, young density-dependent predator/prey interaction

limiting factors density-dependent

Disease regulates populations disease is “good” for the prey removes old, diseased, young density-dependent predator/prey interaction epidemic waves epidemic waves

Energy Food chain E producer primary secondary consumer Trophic levels autotrophherbivorepredator respiration decomposition Photosynthetic food chain parasites each trophic level regulates population of its prey parasites (diseases) regulate population of hosts

Population density also changes behavior Rats in 1/4 acre pens all the food & water they need N t K 5, social behavior destroyed

Predators can also regulate diversity of their community e.g. marine rocky coast intertidal zone

Predators can also regulate diversity A tide pool

dozens of species a diverse community

dozens of species a diverse community Starfish prey on mollusks when starfish removed

Starfish prey on mollusks when starfish removed mussels overgrow everything Starfish are keystone predators many species wiped out They promote species diversity

biotic potential r max = intrinsic rate of increase dN/dt = N r max logistics curve dN/dt = N r max (K - N/K) K = the carrying capacity N t K

r-strategy rapid reproduction N t K “boom and bust” pests are r-strategists

K-strategy N t K large size, deliberate reproduction

r-strategist K-strategist r- and K-strategies contrasted population growth small slow fast large body size many offspring survival low high low parental care few offspring #

r strategy K strategy

Energy Food chain E producer primary secondary consumer Trophic levels autotrophherbivorepredator respiration decomposition Photosynthetic food chain parasites

Energy Food chain E producer primary secondary consumer Trophic levels autotrophherbivorepredator respiration decomposition Photosynthetic food chain parasites parasites are r-strategists

Secondary succession r strategy K strategy

End of Material for First Hour Exam