▁John ▁de ▁V aux ▁by ▁King ▁David ▁I . ▁The ▁de ▁V aux ▁family ▁built ▁a ▁strong hold , ▁known ▁as ▁Castle ▁Tar bet , ▁on ▁the ▁island , ▁but ▁in ▁ 1 2 2 0 , ▁William ▁de ▁V aux ▁gift ed ▁F id ra ▁to ▁the ▁mon ks ▁of ▁D ry burgh ▁Ab bey , ▁in ▁the ▁B orders . ▁His ▁successor ▁built ▁Dir leton ▁Castle , ▁on ▁the ▁main land , ▁as ▁a ▁replacement ▁dwell ing . ▁ ▁Nature ▁and ▁e col ogy ▁The ▁number ▁of ▁bre eding ▁pu ff ins ▁on ▁the ▁island ▁has ▁increased ▁recently ▁due ▁to ▁the ▁removal ▁of ▁an ▁introduced ▁plant , ▁tree ▁m allow ▁( L av ater a ▁ar b ore a ). ▁It ▁is ▁likely ▁that ▁it ▁was ▁plant ed ▁by ▁l ighth ouse ▁keep ers ▁for ▁use ▁as ▁to ile t ▁paper , ▁and ▁for ▁its ▁medic inal ▁qual ities . ▁The ▁shr ub ▁was ▁blocking ▁the ▁ent ran ces ▁to ▁the ▁bre eding ▁bur rows , ▁and ▁in ▁ 1 9 9 6 ▁the ▁number ▁of ▁occupied ▁bur rows ▁had ▁fallen ▁to ▁approximately ▁ 4 0 0 . ▁Following ▁clear ance ▁by ▁R SP B ▁Scotland ▁staff ▁and ▁volunte ers ▁over ▁ 1 , 0 0 0 ▁bur rows ▁are ▁occupied ▁in ▁ 2 0 1 6 . ▁ ▁Cultural ▁references ▁Robert ▁Louis ▁Stevens on ▁often ▁visited ▁the ▁be aches ▁at ▁the ▁area ▁known ▁today ▁as ▁Y ellow cra ig ▁and ▁it ▁is ▁said ▁that ▁he ▁based ▁his ▁map ▁of ▁Tre