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Hur skiljer sig artsammansättningen av jordlöpare Carabidae på Tåkerns strandängar idag jämfört med år 2000?
Halmstad University.
2023 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Sveriges tredje största skalbagge familj är jordlöpare, Carabidae. En viktig familj som också visat sig vara en tydlig indikator, speciellt när man undersöker habitatkvaliteter. I denna studie gjordes en inventering av jordlöparen på strandängarna i Tåkerns naturreservat under år 2023. Studien baserades på en tidigare masterstudie som också gjorde en liknande inventering av jordlöpare år 2000. Målet var att undersöka om man kunde finna någon skillnad i artsammansättning av jordlöpare, jordlöpararternas status mellan år 2000 och 2023 samt om det finns några kopplingar i de skötselplaner som man gjort i reservatet under tiden. Resultatet indikerade att under fångstperioden vecka 20 till 25 år 2000 fångades det något fler arter år 2000 än år 2023. Tvärtom var det när det gällde resultatet för individantal mellan undersökningsåren. Majoriteten av arterna år 2023 var av liten storlek (mindre än 10 millimeter). I jämförelse mellan årens arter var 64,0 % gemensamma, 18,9 % försvunna och 16,0 % tillkomna. Det fanns en variation av diversiteten av jordlöpararter och individer mellan årens olika lokaler, därav fyra av åtta lokaler uppvisade mest spridning och därmed variation mellan alla lokalerna. Medelvärdet för individ och artantal skiljde sig mellan vissa lokaler men hade också en del likheter där exempelvis lokal 5 Väversunda (5) var en återkommande lokal mellan undersökningsåren med höga medelvärden för både arter och individer. Lokaler som Hygnestad (6) hade lägsta medelvärden av både arter och individer år 2000 medan Åsby (4) hade det lägsta medelvärdet för arter och individer år 2023. Enligt den svenska rödlistan fanns det ett fåtal som var rödlistade arter år 2000 och år 2023, men majoriteten hade en livskraftig (LC) status mellan undersökningsåren. De skötselplaner som uppdaterats genom åren har visat på utvecklande insatser för restaurering av strandängarna, först från att Tåkern blev ett naturreservat 1975 till den senaste planen år 2019. Slutsatsen av studien är att det har skett en förändring mellan åren, både i lokalernas utseende och skötsel enligt skötselplaner. Lika mycket skillnaden finns dock inte mellan mängden arter man hittar på Tåkerns strandängar år 2000 eller år 2023 samt utvecklingen av arternas status. Det är dock viktigt att fortsatt undersöka vilka förhållanden som dessa indikatorer har tillsammans med deras strandängar eftersom det tar lång tid att se hur arterna faktiskt reagerar på hur effektiva miljöerna är för deras populationstillväxt. Inför framtiden rekommenderar jag att man fortsätter inventera på Tåkern, så att den ökade kunskapen hjälper till med att prioritera rätt restaurering åtgärder för jordlöparen i Tåkerns naturreservat. 

Abstract [en]

Sweden’s third largest beetle family is the ground beetle, Carabidae. An important family that also has been evidenced to be a prominent indicator, especially when investigating habitat qualities. In this study, an inventory of the ground beetles was made on the flood-meadow in Tåkerns nature reserve during 2023. The study was based on a previous masterstudy, that also did a similar inventory of ground beetles in the year 2000. The goal was to investigate whether you can find any difference in the species composition of ground beetles, the status of the ground beetle species between the year 2000 and 2023 and also if this can have any connections in the management plans that have been made in the reserve in the meantime. The results indicate that during the sampling period of week 20 to 25 in 2000, a slightly greater number of species were caught in 2000 than in the year 2023. The opposite results were of the individual numbers between the survey years. Moreover, the majority of the species 2023 were of small size (less than 10 millimeters). In comparison between the year's species, 64,0 % were common, 18,9 % disappeared and 16,0 % were added. There was a variation of the diversity of ground beetle species and individuals between the locations of the years, of which four of eight sampling sites exhibit the most spread and thus variation between all of the locations. The mean value for number of individuals and species differed between certain locations but also some had some similarities, for example location 5 Väverunda was a recurring location between the survey years with high average values for both species and individuals. Locations such as Hygnestad (6) had the lowest average values for both species and individuals in 2000, while Åsby (4) had the lowest average values for species and individuals in 2023. According to the Swedish red list, were there a few number of red listed species in 2000 and in 2023, but the majority had a least concern (LC) status between the survey years. The management plans that have been updated throughout the years have shown developing efforts for the restoration of the flood-meadows over the years, first from Tåkern becoming a nature reserve in 1975 to the latest plan in 2019. The conclusion of this study is that there have been changes between the years, both in the locations appearance and management according to management plans. However, there is not as much difference in the amount of species that have been found on Tåkerns flood-meadow in 2000 or in 2023 and in the species status. It is still important to continue to investigate what conditions these indicators have together with their flood-meadow because it takes a long time to see how the species actually react to how effective the environments are for their population growth. For the future, I recommend that one can continue to inventory Tåkern, so that increased knowledge can help with prioritizing the right restoration measures for the ground beetle in Tåkerns natureserve.  

Place, publisher, year, edition, pages
2023. , p. 40
Series
Forskning i Halmstad, ISSN 1400-5409
Keywords [en]
Ground beetle, shore meadow, pasture, birdlake, species diversity, variation of vegetation, conservation plans and maintain pressure.
Keywords [sv]
Jordlöpare, strandängar, betesmark, fågelsjö, artdiversitet, vegetations variation, bevarandeåtgärder och hävdtryck.
National Category
Ecology
Identifiers
URN: urn:nbn:se:hh:diva-54225OAI: oai:DiVA.org:hh-54225DiVA, id: diva2:1882091
Educational program
Conservation and Diversity, 180 credits
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Examiners
Available from: 2024-07-05 Created: 2024-07-04 Last updated: 2025-10-01Bibliographically approved

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