Homework #3.docx

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Department
Fisheries And Wildlife
Course
F_W 1100
Professor
Trista Strauch
Semester
Spring

Description
Nicholas Noto Dr. Strauch Fisheries and Wildlife 1100 23 April 2013 Homework #3 1. The swim bladder in fish is used for buoyancy. When the fish wants to go deeper  in water it just deflates it so it is able to sink and when it wants to rise in the water  it inflates it with gas to float upward. Since darters are bottom dwellers, they have  lost their swim bladders over time because they do not need it to rise to the top of  the water. Also, because they live in fast­moving streams it is easier to stay on the  bottom of the stream and hold on when they do not have a swim bladder.  2. No, it is not plausible that the female snakes would swallow their offspring to  protect them. Garter snakes are ovoviviparous, meaning their offspring develop in  eggs inside the mother. So the baby snakes that were emerging from the cut open  mothers were not actually born yet. The advantage to this is that the developing  babies are kept safe because predators cannot easily get to the eggs. This type of  development is not the most convenient way for all species of snakes because  some of them live different life styles and that type of development would not be  realistic.  3. No, frogs that have temperature­dependent sexes do not have a 50­50 ratio of  males to females. This is because the 
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