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CONSERVATION OF OTTER AND FIRE-BELLIED TOAD IN A FRAGMENTED NATURE - An investigation of barriers and possibilities to maintain otter and fire-bellied toad a favourable status in respectively West Zealand and East Funen

By Martin Pedersen, Klaus Andersen and Andreas Lund Povlsen

Abstract

Resumé Omdrejningspunktet i denne rapport er en analyse af odderens bevaringsmuligheder i tre sammenhængende habitatområder i Vestsjælland, og klokkefrøens bevaringsmuligheder i ét habitatområde på Østfyn, der udgøres af to separate lokaliteter. Fælles for de to arter er, at de er stærkt truet og sårbare i de pågældende områder og spørgsmålet er derfor, hvilke landskabelige og forvaltningsmæssige forhold der forårsager dette. Endvidere undersøges, hvilken effekt Habitatdirektivet har som redskab til at bevare truede arter i Danmark. Med afsæt i denne problemstilling har undersøgelsen til formål at identificere landskabelige og forvaltningsmæssige barrierer i forhold til at opnå Habitatdirektivets mål om en gunstig bevaringsstatus for de to arter. På baggrund heraf opstilles endvidere en række anbefalinger og forslag til forbedrende foranstaltninger, der kan bidrage til arternes bevaring. Gennem en kartografisk analyse identificeres de landskabelige barrierer i undersøgelsesområderne på baggrund af de to arters forskelligartede habitat- og spredningskrav. Herefter vurderes deres bevaringsstatus i habitatområderne på baggrund af DMU’s kriterier for gunstig bevaringsstatus. Identificeringen af forvaltningsmæssige barrierer foregår gennem en analyse af, hvilke forhold der har haft indflydelse på implementeringen af Habitatdirektivet i Danmark. F.eks., hvordan forvaltningsmæssige traditioner har påvirket implementeringsresultatet. Forslagene til forbedrende foranstaltninger er forankret i den udledte viden fra de to analysedele. Det primære resultat af undersøgelsen er, at der kun findes få landskabelige og forvaltningsmæssige barrierer i forhold til at imødekomme odderens habitat- og spredningskrav i Vestsjælland. Den væsentligste barriere i forhold til at sikre odderen en gunstig bevaringsstatus er forekomsten af individer og derfor anbefales en udsætning af odder. I forhold til klokkefrøen på Østfyn, er der både fundet landskabelige og forvaltningsmæssige barrierer af afgørende betydning for artens bevaringsmuligheder. De består primært af en intensiv arealanvendelse i undersøgelsesområdet, som forhindrer udveksling af individer mellem habitatområdets to dele, en utilstrækkelig habitatkvalitet og mangel på habitater. På den baggrund er der opstillet to scenarier, der på forskellig vis kan bidrage til at sikre klokkefrøen en gunstig bevaringsstatus. Abstract The focus of this report is an analysis of the possibilities for conservation of the otter in three interconnected Special Areas of Conservation (SAC) in West Zealand, and the possibilities for conservation of the fire-bellied toad in one SAC in East Funen which consists of two separate areas. A common issue for the two species is that they are severely under threat and vulnerable in the considered areas. The question is which issues, conditions of landscape as well as administrative conditions, have an influence on this situation. Additionally, the instrumental effect the Habitats Directive has on the conservation of species under threat of extinction in Denmark is investigated. While bearing these issues in mind, the main purpose of the study is to identify barriers, be they the conditions of the landscape or the administrative conditions, in relation to the achievement of the aim of the Habitats Directive to maintain a favourable conservation status for the two species. Considering to these issues it is furthermore a purpose to put forward a number of recommendations and specific proposals for beneficial measures, which can contribute to the conservation of the species. By means of a cartographical analysis, barriers in the conditions of the landscape are identified in the studied areas in relation to the two species differing needs of habitat and dispersal. Subsequently, their conservation status in the SAC’s is evaluated in relation to DMU’s criteria for a favourable conservation status. The identification of administrative barriers will take place through an analysis of what conditions influence the implementation of the Habitats Directive in Denmark. This including, what impact administrative traditions have had on the result of the implementation? The proposals for the beneficial measures are based on the extracted knowledge of both parts of analysis. The primary conclusion from the study is that there are only a small number of barriers, administrative and landscape conditions, to meeting the needs of habitat and dispersal in West Zealand. A factor in securing a favourable conservation status for the otter is the prevalence of individuals and a release of otter is therefore recommended. With regard to the fire-bellied toad in East Funen both administrative and landscape conditions have been found to set up barriers of fundamental significance for the conservation of the species. They consist primarily of an intensive land use in the studied area which makes exchange of individuals between the two parts of the SAC impossible, an insufficient quality of the habitat, and a lack of habitats. With a reference to these issues, two scenarios have been put forward which in different ways can secure a favourable conservation status for the fire-bellied toad

Topics: Habitatdirektiv, Artsbevarelse, Implementeringsteori, Nyinstitutionel teori, Populationsøkologi, Spredningsdynamik, Kriterier for gunstig bevaringsstatus, Katografisk analysemodel, Odder, Klokkefrø, Vestsjælland, Østfyn
Year: 2007
OAI identifier: oai:rudar.ruc.dk:1800/2437
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