Niche
Mandibulata are important crop pests or disease vectors. Also, some are beneficial because of crop pollination or pest control.
http://books.google.com/books?id=_kHeAXV5-XwC&pg=PA231&lpg=PA231&dq=mandibulata+asexual+reproduction&source=bl&ots=x4dMpyn3Yb&sig=KF66bAGlq8uMC4Vpao4-T_-Y3tM&hl=en&sa=X&ei=qLOXU_-9Ko3JsQS61YD4AQ&ved=0CCkQ6AEwAjgK#v=onepage&q=mandibulata%20asexual%20reproduction&f=false