November18thLecNotes

November18thLecNotes - November 18th 2008 Lecture Notes...

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November 18 th 2008 Lecture Notes taken by Dr Balko (ppt) Routine Class Matters ~ Reading assignments for Today Chp 34 and Chp 37. (ppt) 1. What relationship(s) exist, if any, between predation, parasite loads and disease?? 2. What are Keystone Predators and why are they important to ecological communities? Some prey gain protection through mimicry , in which one species “copycats” the appearance of another Batesian mimicry occurs when a palatable species resembles an unpalatable one (ex. Figure 37.3C). * Müllerian mimicry is when two unpalatable species look like each other (ppt) ~ • In parasitism a parasite obtains food at the expense of its host {however, an individual could live a long life w/o knowing they have a parasite} • Pathogens are parasites that are often lethal to their hosts • Be able to discern a clear distinctions among predators, parasites, and pathogens? What are those little caterpillar-attacking wasps in Intro Essay? They are actually parasitoids. • What’s with all these rabbits in figure 37.6A? They are ‘invading’ rabbits in Australia [we’ll come back to this]. (ppt) Clicker Question answer = A & D. However, A is really the better answer because predators do incur a cost if they fail to choose a palatable prey, OR if they choose a toxic model. 1
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November 18 th 2008 Lecture Notes taken by Dr Balko (ppt) Key Stone Species Figure 37.4 • A keystone predator may maintain community diversity by reducing the numbers of other predators and competitors • Removal of a keystone predator from a community can cause major changes in community dynamics ~ as depicted by Figure 37.4. Spiny sea urchins eat brown kelp, sea otters (in turn) eat spiny sea urchins, while the killer whales eat sea otters. Which link in this food chain is the key stone predator? Sea otters were over harvested, resulting in a population explosion of sea urchins. As a result the brown kelp population was decimated. Wildlife biologist’s translocated sea otters back to the northern California waters – the sea urchin populations dropped and the kelp recovered. HOWEVER, there has been a recent collapse in the northern California sea otter
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November18thLecNotes - November 18th 2008 Lecture Notes...

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