GEOL 3070 Lecture 27: Marine Invertebrate Animals
Premium

3 Pages
92 Views
Unlock Document

Department
Geological Sciences
Course
GEOL 3070
Professor
Thomas Marchitto
Semester
Spring

Description
Marine Invertebrate Animals Thursday, April 20, 20111:01 AM Invertebrate Phyla (Kingdom Animalia) • >90% of all living (and fossil) animals are invertebrates • Lack bony internal skeleton • 33 phyla on Earth today • 5 phyla surveyed here (particularly conspicuous in ocean) I. Porifera (sponges) • Benthic, sessile • Spongin with network of opal (or calcite)spicules • Flagellated collar cells sweep water out while capturing food particles • Digestion carried out by ameboid cells No digestive, circulatory, respiratory, or nervous systems • II. Cnidaria • Toxic stinging cells: cnidocytes (aka nematocysts) • Repel predators and capture prey • Radial symmetry • Primitive nervous system • Food drawn to mouth and simple dead-end digestive cavity A. Medusae (jellies) • Predatory zooplankton (swim weekly) • Bell-shaped fringed with muscle and tentacles B. Polyps: sea anemones • Benthic and mainly sessile, with basal disc (allows them to attach to the bottom) C. Polyps: corals • Most live in CaCO 3aragonite) cups called corallites • Usually colonial • Hermatypic: reef builders • Ahermatypic: Don't build reefs (live in solitary form) ○ Usually deep sea corals 1. Zooxanthellae • Most reef corals have symbiotic algae (Dinoflagellates) • Algae release organic molecules to coral (food) • Coral supplies nutrients (N,P) and C2 to algae • Algae gives reefs their color (also benthic and encrusting algae) 2. Limitations on Reef Corals (hermatypic) • Optimal temperature range 23-29°C (tropics) • Most live shallower than 25m (need sunlight for algae) • Can't tolerate low salinities (runoff) • Killed by high turbinity (runoff) • Killed by exposure to air for more than a few hours 3. Atolls • Ring of coral around submerged volcanoes • Volcano must sink slower than coral growth (~1 cm/yr) 4. Reef Ecosystems • ~100X more productive than typical tropical waters • Efficient trapping and recycling of nutrients 2 • Great Barrier Reef: >2900 reefs covering 344,000 km • Reefs are the most diverse marine ecosystems • Provide habitat and breeding ground for ○ ~3M marine species ○ ~1/3 of all fish species • Fish, mollusk
More Less

Related notes for GEOL 3070

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit