What factors affect island species diversity and why?

Explained as below.

Explanation:

Islands account for 1/6th of the earth's surface area but consist of about 30% of the biodiversity hotspots in the world.

Factors like  

Interactions among predators and prey (Invasibility)

Habitation sites that impact immigration.

Species adaptation to these places.

Resource availability.

As islands are rich in natural resources as islands are surrounded by waters on all sides thus remain isolated for long term periods.

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.