test 2 study guide - Lifecycles Indirect lifecycle...

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Lifecycles Indirect lifecycle Organisms that hatches out of an egg does not look like an adult Larva 80% of all marine invertebrates Provisions Food energy Yolk-most common way offspring are provisioned by their parents Can live off it for a coupel of days, at most a week Zoea Looks like the larva crab Nauplius 3 pairs of legs, single eye which is simple not compound Most crustaceans Primitive Not undergoing that much egg development True crabs Going through more egg development Direct lifecycle Typically do not have masked offspring Capsule has 50 to 200 more eggs than will ever hatch Ones that do not hatch are eaten Edible eggs or nurse eggs which are consumed by the survivors; sometimes infertile Feeding Suspension feeding Tiny particles in the water that are smaller than themselves Not filter feeding because that implies there is a mechanism used to mechanically sive, or filter, the water Bivalves employ gills as feeding mechanisms Snail feeding Rasping and grinding organ
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Muscles pull radula over rod back and forth Constantly making new ribbon and teeth Welks Eat meat, other bivalves Pry them open and drill bit to eat bivalves Cone snails In coral reefs Teeth evolved into harpoons, or spears with barb Jab radula in prey Inject toxins through hallow teeth Conotoxins Rod Knot Bird that has the longest migration patter Flies from souther south America to the Greenland area Goes through our east coast Eats horse shoe crab eggs Fisherman are getting horse crabs and using them as baits for welks Estuaries A partially enclosed coastal embayment where freshwater and seawater meet and mix Eutrophication Addition of excess nutrients to a body of water Coastal-plain estuary Formed at the end of the last ice age when the rising sea level invaded low-lying coastal river valleys Tectonic estuary Forms when the sea reinvades the land due to subsidence of the land, not as a result of a rising sea level Semienclosed bay or lagoon Sandbars build up parallel to the coastline and partially cut off the waters behind them from the sea
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This note was uploaded on 03/19/2008 for the course ZOL 453 taught by Professor Hill during the Fall '07 term at Michigan State University.

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test 2 study guide - Lifecycles Indirect lifecycle...

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