BIO207H5 Lecture 9: lecture 9 notes

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copperscorpion639

9 Jan 2011

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Group living: young are protected in the middle and less attack on vulnerable prey. Cicadas: predation occurs much later then coming out of the ground, it provides advantage as predator response is later then emergence of cicadas. Predator satiation: most of the offspring are produced in a short period of time. Stalking: search time takes longer as u have to follow ur prey. Pursuit: takes less time because it takes less time to follow and look for prey. Predators may use camouflage as a way to lure prey. Reduce energy of plants because its lost its parts (roots and leaves etc) Secondary compounds: makes the leaves taste bad or toxic so deter herbivore but some herbivores have adapted to break down those toxic compounds. Natural selection: evolves by increasing the chances of survival of the individuals in which they are found. Adaptation: is a genetic change that occurs over generations in response to natural selection.

Related Questions

Tree hole mosquito experiment
We tested for facultative changes in behavior of an aquatic insect in response to cues from predation and for evolution of prey behavior in response to experimental predation regimes. Larvae of the tree hole mosquito Aedes triseriatus reduced filtering, browsing, and time below the surface in response to water that had held a feeding larva of the predatorToxorhynchites rutilus. We subjected experimental A. triseriatuspopulations to culling of 50% of the larval population, either by T. rutiluspredation or by random removal. After two generations of laboratory culling, behavior of the two treatment groups diverged. Aedes triseriatusin control-culled lines retained their facultative shift from filtering to resting, but tended to lose the response of reduced browsing below the surface in water that had held a feeding predator. Predator-culled lines lost their facultative response of reduced filtering in water that had held a feeding predator and evolved toward more time resting and less time filtering in both water that had held a feeding predator and water that had held only A. triseriatus. Predator-culled lines retained their facultative response of reduced browsing below the surface in water that had held a feeding predator. Two field populations and their reciprocal hybrids responded similarly to cues from predation and did not differ in their evolutionary response to experimental culling. We conclude that consistent presence or absence of predation can select rapidly for divergence in prey behavior, including facultative behavioral responses to predators.

What do the terms filtering, browsing and resting exactly mean?
Please explain what is happening during the 2 generations of laboratory culling?
What are the responses for the treatment group?
How is A. triseriatus affected through predation?
How is T. rutilus affected through predation?

tealgoose402

Pick an organism, and a trait of that organism. You shouldexplain how the trait evolved. Be sure that your evolutionaryexplanation isa sensible one. Do not choose an organism or traitthatanother student chose, or you will not receive credit for yourpost. Your responsein this session is to propose an alternativeexplanation for why the trait in anotherpost evolved. For instanceif aclassmates original post said that a peacockâs plume might haveevolved due tosexual selection, your response might detail how theplume might have evolved asa way to scare off predators.

limeplatypus318

	Plant A	Plant B
Use following link to fill in numbers and answer fewquestions.	Plant A	Plant B
Prediction: startingpopulation
Prediction: endingpopulation
Starting population
Ending population


	Plant A	Plant B	Herbivore A
	Plant A	Plant B	Herbivore A
Prediction: startingpopulation
Prediction: endingpopulation
Starting population
Ending population




1. Whatassumptions does this model make about co-dominance as well as thegeneral terrain of the ecosystem?

2. Do youfind one producer to be dominant? Why might one producer bedominant over another?
Step 2:
1. Do youfind one producer to be dominant? Why might one producer bedominant over another?

2. How doproducer population numbers with the presence of an herbivorecompare to the primary colonizer model?















DATA TABLE: ECOLOGY
LESSON 2

Lesson 2:	Plant A	Herbivore A	Omnivore A	Top Predator
Step 1
(X, Â, or Â¯)
Prediction
Simulation 1
Simulation 2


Lesson 2:	Plant A	Plant B	Plant C	Herbivore A	Herbivore B	Herbivore C	Omnivore A	Omnivore B	Top
									Predator
(X, Â, or Â¯)
Prediction
Simulation 1
Simulation 2
Modifications made


Responses to questions
Step 1:
1. Was your predictioncorrect? How did you arrive at your prediction? What differenceswere there between your prediction and the simulation?

2. What would happen to thisimaginary ecosystem if the producers were to die out?

3. Which populations wouldbenefit the most from the presence of decomposers?


Step 2:
1. Was your predictioncorrect? How did you arrive at your prediction? What differenceswere there between your prediction and the simulation?

2. Were you able to modifythe parameters so that each species survived? Explain how youdecided what changes to make.


3. Which way does energy flowand how does eating an organism result in energy transfer?

peachspider723

BIO207H5 Lecture 9: lecture 9 notes

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