[3] creating a floristic tension zone.
[4] A marine tension zone may be affected by variables such as depth, climate or salinity.
[5] In a tension zone there is the increased probability of hybridization between species of the separate zones and thus the tension zone may also be a hybrid zone.
[6] Historically tension zones were entirely natural in origin, however human activity has altered the tension zones in a variety of areas all over the world.
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