 Consequently, we do not have sufficient information about biodiversity in most places on earth.Even though biodiversity declines from the equator to the poles in terrestrial ecosystems, this is still a hypothesis to be tested in aquatic and especially marine ecosystems where causes of this phenomenon are unclear.In addition, particularly in marine ecosystems, there are several well stated cases where diversity in higher latitudes actually increases (Moustakas & Karakassis 2005).