Why did the Spanish take the first African slaves to Hispaniola?

The islands were producing far more agriculturally at this time then the mainland, so it make sense that the first African slaves went to Hispaniola. The crops that were being grown during the 16th and 17 century in this area were very labor intensive. Due to disease and all that, that native Taino population on the island was wiped out and it was therefore necessary for the Spanish plantation owners to look elsewhere for cheap labor. The beginning of the slave trade comes about after pretty much the same sequence of events everywhere in the Americas, just at different times. Need for increased labor --> loss of native population from disease --> slave trade