ip el ago ▁of ▁small , ▁flat ▁islands ▁and ▁sk er ries ▁in ▁shall ow ▁water , ▁with ▁large ▁re ed ▁b eds ▁in ▁the ▁trans itory ▁zone ▁between ▁islands ▁and ▁open ▁water . ▁Several ▁of ▁the ▁larger ▁islands ▁are ▁for ested , ▁domin ated ▁by ▁o ak , ▁p ine ▁and ▁bir ch , ▁while ▁the ▁smaller ▁islands ▁have ▁a ▁more ▁diverse ▁fl ora ▁including ▁areas ▁of ▁open ▁land . ▁ ▁The ▁arch ip el ago ▁is ▁considered ▁to ▁be ▁one ▁of ▁the ▁most ▁important ▁bre eding ▁areas ▁for ▁har bour ▁se al ▁in ▁the ▁Balt ic ▁Sea , ▁where ▁the ▁species ▁is ▁under ▁threat . ▁At ▁most , ▁ 1 5 0 ▁se als ▁have ▁been ▁recorded ▁in ▁the ▁nature ▁reserve , ▁contrib uting ▁about ▁ 5 0 % ▁of ▁the ▁total ▁amount ▁of ▁reprodu ction ▁of ▁the ▁species ▁in ▁the ▁Kal m ars und ▁area . ▁ ▁The ▁nature ▁reserve ▁also ▁displays ▁a ▁rich ▁bird - life . ▁O sp rey , ▁white - ta iled ▁e agle ▁and ▁western ▁mar sh ▁har rier ▁are ▁birds ▁of ▁pre y ▁regularly ▁seen ▁in ▁the ▁arch ip el ago . ▁Other ▁rec urr ing ▁birds ▁include ▁common ▁sh el du ck , ▁vel vet ▁sc oter , ▁tu ft ed ▁du ck ▁and ▁red - back ed ▁sh rike . ▁ ▁Lar ge ▁parts ▁of ▁the ▁area ▁are ▁restricted ▁access ▁areas ▁during ▁most ▁of ▁the ▁spring , ▁summer ▁and ▁early ▁aut umn . ▁ ▁References ▁ ▁Category : N ature ▁res erves