Handlingsplan for kalksjøer - Direktoratet for naturforvaltning
Handlingsplan for kalksjøer - Direktoratet for naturforvaltning
Handlingsplan for kalksjøer - Direktoratet for naturforvaltning
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InnholdSammendrag .................................................................................................................................................................................. 5Summary .......................................................................................................................................................................................... 61 Innledning................................................................................................................................................................................... 71.1 Bakgrunn ............................................................................................................................................................................ 71.2 <strong>Handlingsplan</strong>ens målsetning ..................................................................................................................................... 72 Kalksjøer ..................................................................................................................................................................................... 72.1 Definisjon ........................................................................................................................................................................... 72.2 Beskrivelse av naturtypen ............................................................................................................................................ 82.3 Utbredelse i Norge ......................................................................................................................................................... 82.4 Beskyttelse og vern ......................................................................................................................................................113 Viktige artsgrupper i naturtypen ...................................................................................................................................153.1 Botaniske grupper ........................................................................................................................................................153.1.1 Kransalger ...........................................................................................................................................................153.1.2 Karplanter ...........................................................................................................................................................163.1.3 Andre grupper ....................................................................................................................................................183.2 Zoologiske grupper .......................................................................................................................................................183.3 Fokusarter i kalksjøene ...............................................................................................................................................194 Ulike typer <strong>kalksjøer</strong> ............................................................................................................................................................204.1 Kransalgesjøer (Chara-sjøer) (E0701) ...................................................................................................................204.2 Kalkrike tjønnaks- sjøer (E0702) .............................................................................................................................224.3 Humusrik kalksjø (E0703) (ny) ..................................................................................................................................234.4 Vegetasjonsfrie <strong>kalksjøer</strong> (E0704) (ny) ..................................................................................................................245 Påvirkningsfaktorer .............................................................................................................................................................255.1 Eutrofiering .....................................................................................................................................................................255.2 Fremmede arter .............................................................................................................................................................255.3 Tilgroing helofytter.......................................................................................................................................................265.4 Arealendringer................................................................................................................................................................265.5 Klima .................................................................................................................................................................................266 Mål ..............................................................................................................................................................................................266.1 Hovedmål .........................................................................................................................................................................266.2 Kunnskapshull .................................................................................................................................................................266.3 Forslag til konkrete mål ..............................................................................................................................................276.3.1 Kortsiktige mål ..................................................................................................................................................276.3.2 Langsiktige mål ................................................................................................................................................277 Tiltak ..........................................................................................................................................................................................277.1 Iverksatte tiltak ..............................................................................................................................................................277.2 Prioriterte tiltak (2010 – 2016) ............................................................................................................................... 277.2.1 Kartlegging av naturtypen og viktige arter .............................................................................................277.2.2 Truede arters miljøkrav ..................................................................................................................................287.2.3 Trusselfaktorer og samordning med vanndirektivet ............................................................................287.2.4 Beskyttelse og vern .........................................................................................................................................307.2.5 In<strong>for</strong>masjon ........................................................................................................................................................317.2.6 Data og datalagring ........................................................................................................................................317.3 Framdrift og kostnader ...............................................................................................................................................318 Litteratur ..................................................................................................................................................................................324