ary ▁Site ▁of ▁Special ▁Scient ific ▁Interest ▁( SS SI ); ▁the ▁Al de , ▁O re ▁& ▁But ley ▁Est u aries ▁Special ▁Area ▁of ▁Conserv ation ▁( S AC ); ▁the ▁Al de - O re ▁Est u ary ▁Special ▁Prote ction ▁Area ▁( SP A ); ▁the ▁Al de - O re ▁Est u ary ▁R ams ar ▁Site ▁site ; ▁the ▁Su ff olk ▁Coast ▁and ▁He ath s ▁Area ▁of ▁Out standing ▁Natural ▁Beaut y ▁( A ON B ); ▁and ▁the ▁Su ff olk ▁Heritage ▁Coast ▁area . ▁ ▁Management ▁ ▁The ▁Royal ▁Society ▁for ▁the ▁Prote ction ▁of ▁Bird s ▁own s ▁and ▁man ages ▁Ha ver gate ▁Island . ▁Active ▁habitat ▁management ▁of ▁the ▁l ago ons ▁is ▁employed ▁to ▁benefit ▁the ▁islands ▁bre eding ▁and ▁winter ing ▁bird ▁populations . ▁Activ ities ▁include ▁control ▁of ▁water ▁levels ▁and ▁sal inity , ▁impro ving ▁bre eding ▁sites , ▁providing ▁increased ▁feed ing ▁edges , ▁the ▁creation ▁of ▁deep ▁water ▁ref ug es ▁for ▁in verte br ates ▁and ▁the ▁control ▁of ▁nest ▁pred ators ▁such ▁as ▁fo xes ▁and ▁g ull s . ▁Vol unte ers ▁also ▁help ▁with ▁work ▁on ▁the ▁island ▁including ▁carrying ▁out ▁bird ▁surve ying . ▁ ▁Th re ats ▁ ▁Due ▁to ▁the ▁low - lying ▁nature ▁of ▁the ▁island , ▁the ▁R SP B ▁recogn ises ▁that ▁rising ▁sea ▁levels ▁have ▁the ▁great ▁potential ▁to ▁threaten ▁the ▁island ▁in ▁the ▁coming ▁century . ▁Work ▁has ▁been ▁carried ▁out ▁to