Ward_Lect34A_Chordata_ppt

Ward_Lect34A_Chordata_ppt - BIS2C Winter 2010 (Ward)...

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BIS2C Winter 2010 (Ward) Lecture 34. Chordata, Part 1 Today's lecture (10 March) finish Echinodermata introduction to Chordata major features early chordate evolution origin of vertebrates jawless and jawed fish Friday lecture tetrapods, especially amniotes convergent evolution
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BIS2C: Room assignments for final exam Section Students with the last name Go to… A: Thursday 8am A-G 179 Chem H-Z 1100 SocSci B: Tuesday 1pm A-La 1001 Giedt Le-Z 1100 SocSci
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BIS2C Sect A clicker questions: student ID’s not on class roster Student ID Clicker ID 6 ?? 992283142 77559F 993366259 EECA10 993416604 DCBC1E 993444773 76EA9C 993557631 ?? 993668300 30AC18 993693090 EEED58 993837775 F6E976 994798295 509AF5 994930781 5.49E+68 994986162 EC9B5A 995019054 168974 995725050 B6F820 995966660 F4DA4B 996370048 ?? Send explanation or correction by Friday, March 12 to: Susan Keen (slkeen@ucdavis.edu) Tom Goliber (tgoliber@ucdavis.edu)
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California sea otters eat urchins. Sea urchins consume kelp. When sea urchins are abundant they can destroy underwater kelp forests.
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Sea otters can be considered a “keystone species” in this system because 1. The kelp forests flourish when they are removed. 2. Their presence or absence has a large effect on ecosystem structure. 3. They provide the key to understanding why sea urchins eat kelp. 4. Their abundance is positively correlated with the abundance of other animals in the environment. 5. They have evolved to eat sea urchins.
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Sea cucumbers (Holothuroidea) soft-bodied and slug-like (ossicles much reduced) greatly elongated oral/aboral axis, secondarily bilateral grazers, suspension feeders
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= pentaradial symmetry = partial bilateral symmetry Hypothesized phylogeny of major echinoderm groups
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Sea cucumbers (Holothuroidea) can expel parts of their gut as anti-predator defense ( http://www.youtube.com/watch?v=lKWSLg5PDiU ) Sea cucumber with expelled Cuvierian tubules
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What are chordates? Sea squirts, lancelets, jawless fishes, jawed fishes, and
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Ward_Lect34A_Chordata_ppt - BIS2C Winter 2010 (Ward)...

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