BIOL10001 Lecture Notes - Lecture 28: Sea Anemone, Fauna, Leeuwin Current
30 Jul 2018
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Temperate marine fauna: more than 80% of southern marine fauna are endemic, no major extinction events. Isolation more than 65 million years: currents act as barriers & (cid:494)transporters(cid:495, low diversity (compared to tropics, higher endemism. Intertidal rocky shores & sub-tidal rocky reefs: seagrass beds (australia: largest area of temperate seagrass, kelp forests (up to 30m high, bonney upwelling. Rocky shore zonation: strong bio-physical gradients driven by tides, zonation distinct bands of organisms along the rocky shore, driven primarily of bio-physical gradients (ie predation, physical drivers- tides (constant flux), master driver. Barnacles filter feeding appendage, hard-tough shells, protection from desiccation. Limpets zones grazing molluscs, go along eating algae (cid:494) Intertidal experiences periodic high and low tides. Algae need to be wet for long periods of time. Even though there is higher wave shock, lower salinity, temperature & desiccation. Sub littoral fringe (large algae, ascidians, sea urchins) Retreat into shell & survive dry low tides. Radula tongue- rake/scrape/cut algae, bore into prey.
