A wildlife reserve

This task is about creating a wildlife reserve.
A wildlife reserve has been suggested for the area marked on the map. A fence, shown by the dashed line, is to be built around the edge of the reserve. 
 
Map of Suggested Reserve
wildlife-reserve.png

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a)  Someone said they should include part of the river in the reserve.
     Why would this be a good idea?

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b)  Why does the reserve include areas of scrub and swamp as well as native bush?

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c)  Why would a fence be built around the reserve?

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d)  How do reserves benefit animals and plants?