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Sympatric:reproductively isolated subpopulation in the midst of its parent population (change in genome); polyploidy in plants (the acquisition of multiple copies of each chromosome)
What causes Extinction?
Everglade Kite feeds exclusively on apple snail, found in swamps , such behavioral specialization renders the kite extremely vulnerable to any environmental changes
Competition by exotic (non-native) species ~ cause of 68% of species designation as extinct, endangered, vulnerable, rare; travel
Overexploitation ~ commercial harvest or sport fishing; illegal trade
Devils hole pup fish found only in one spring fed water hole in the Nevada Desert. As rainfall decreases pupfish population become isolated in shrinking streams and small springs