Biodiversity is a term that describes the ecosystem complexity or taxonomic
diversity at the species, genus, family and order or phylum level and distributed
unevenly across different environment (Allaby, 1998; Chase and Leibold, 2002).
Marine and tropical environments maintain extremely diverse species assemblages,
whereas others such as dessert and alpine support a restricted range of species
(Gastan 2000). The ocean makes up 97% of the biosphere and support tremendous
species diversity but understanding the most species diversity in marine environment
remain extremely limited. The marine mammal is one of the major neglected
communities in the pelagic ecosystem of most of the oceans
