Theory of Island Biogeography ndiyo inonyanya kubatsira kunzwisisa kwesainzi zvese zviri zviviri maitiro uye maitiro ekuyera mwero wekutsakatika kwemarudzi. Chiyero chekutsakatika kwemarudzi chinoitwa chakaomarara nenyaya yekuti marudzi mazhinji epasi haana kutsanangurwa kana kuongororwa. Kufungidzira kunosiyana zvakanyanya kuti mangani marudzi aripo chaizvo (anofungidzirwa huwandu: 3,600,000-111,700,000) kusvika sei akagamuchira mhando chaiyo (anofungidzirwa huwandu: 1.5-8 mamirioni emhuka).
mhando hadzina kutsanangurwa kana kuongororwa