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Species Interactions and Community structure

Food Chains vs. Food Webs. A Food Chain in the Rocky Tidal Pools. Tide Pool Food Chain Players: primary producers. Algae at the base of the food chain Attached to rocksPorphyra and Corallina are two common species. Filter feeders. Balanus the barnacleAttached to rocks andSessile. Motile guys.

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Species Interactions and Community structure

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    1. Species Interactions and Community structure Chapter 17 Ecology

    2. Food Chains vs. Food Webs

    3. A Food Chain in the Rocky Tidal Pools

    4. Tide Pool Food Chain Players: primary producers Algae at the base of the food chain Attached to rocks Porphyra and Corallina are two common species

    5. Filter feeders Balanus the barnacle Attached to rocks and Sessile

    6. Motile guys Katharina tunicata, a chiton Herbivore Roams around on rocks scraping algae like a wanderin’ ‘dillo of the tide pool

    7. Another motile guy Nucella Also motile like chitons, but… they eat barnacles

    8. Our Star: Pisaster Top predator (top of the ‘food chain’) Roams (slowly) around rocks ripping open molluscs and chowing down on them.

    9. So what happens when we remove Pisaster, our top predator? Let’s see a model simulation Results of an actual experiment (not a model)

    10. The results were ‘transferable’ to s similar tidepool in New Zealand

    11. The Empty Forest While many Neotropical Forests appear intact… That is, many areas are not deforested… Hunting has depleted many species

    12. The Empty Forest

    13. I hate fire ants, but…

    14. Citrus Ants and Citrus Citrus ants, Oecophylla Eat bugs that infest citrus in China Weave nests of silk to construct nests Nests are placed in trees by farmers But ants also ‘harvest’ Homopteran nectar

    15. Weaver ants continued

    17. The Food Web: simplified version

    18. Defining a Keystone species

    19. Introduction of species can alter food webs

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