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Uppföljningsinventering av Karlsviks och Bohults naturreservat - observerade förändringar sedan reservaten bildades
Halmstad University, School of Business, Engineering and Science.
Halmstad University, School of Business, Engineering and Science.
2020 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Follow-up inventory of Karlsvik and Bohult nature reserves - observed changes since their establishment (English)
Abstract [en]

Abstract

Broadleaved forests are highly valuable biotopes with important recreational value and contain rich occurrences of species of conservation concern. To monitor the development of nature values in a forest ecosystem during an interval of approximately ten years, follow-up inventories were carried out, following the first inventories which took place ten years ago in two nature reserves (Karlsvik and Bohult) dominated by broadleaved trees in the county of Halland, Sweden. Indicator species of lichen and moss were searched for and compared to the first inventories. The results show that both reserves contain more indicator species today than approximately ten years ago, though a change in the species composition was observed. In Bohult fewer indicator lichens were observed, although more observations were made of indicator mosses - making the total number of indicator species higher than in the previous inventory. Potential explanations to the differing results of the two reserves were discussed and assessed to be for varied reasons. The observed increased occurrences of indicator species may be due to increased continuity leading to bigger and older trees which make way for more epiphytes. The observed decreased occurrences of indicator species may be due to human activity such as newly carried out clearcutting in close proximity to the reserve (which could lead to edge effects or other environmental stresses), nitrogen deposition or exploitation. An observed threat for both reserves is the increasing growth of norway spruce (Picea abies) which may outcompete broadleaved species and the potential indicator species they may inhabit.

Abstract [sv]

Sammanfattning

Ädellövskogar är mycket värdefulla naturtyper med höga rekreationsvärden och med rika förekomster av naturvårdsarter. För att utvärdera förändringen av skogliga naturvärden inom en tidsperiod av ca tio år utfördes uppföljningsinventeringar av två tidigare inventerade naturreservat som domineras av ädellövskog i Hallands län i Sverige. Signalarter av lavar och mossor eftersöktes och jämfördes med tidigare funna signalarter. Båda reservatens ursprungliga inventeringar utfördes för ca tio år sedan och resultaten visar att de båda reservaten nu har fler signalarter än tidigare, samtidigt som en förändring observerades i artsammansättningen då samtliga signalarter ej återfanns. I Bohult observerades färre signalartslavar, men fler signalartsmossor - vilket resulterade i ett större antal signalarter totalt för området. Potentiella förklaringar till de skilda förändringarna diskuterades och bedömdes bero på varierande orsaker. Det större antalet observerade signalarter skulle kunna förklaras av ökad tid för kontinuitet med fler grova och äldre träd som utgör lämpliga substrat för kolonisering av de eftersökta signalarterna. Det färre antalet observerade signalartslavar i Bohult skulle kunna bero på mänsklig påverkan i form av nyligen utförda kalavverkningar i angränsning till reservatet, vilket kan bidra till kanteffekter eller andra påfrestningar på miljön. Kvävenedfall, dikning av vattendrag eller annan exploatering föreslås också som möjlig orsak. Ett observerat hot för båda reservaten var igenväxningen av gran, vilken skulle kunna konkurrera med ädellövträden och de signalarter de kan husera.

Place, publisher, year, edition, pages
2020. , p. 27
Keywords [en]
Inventory, follow-up inventory, indicator species, broadleaved forest, biotope assessment, mosses, lichen, Karlsvik, Bohult, nature reserve, Halland, Sweden
Keywords [sv]
Inventering, uppföljningsinventering, Karlsvik, Bohult, signalart, signalarter, ädellövskog, biotopbedömning, mossor, lavar, naturreservat, Sverige, Halland
National Category
Ecology Other Biological Topics
Identifiers
URN: urn:nbn:se:hh:diva-42784OAI: oai:DiVA.org:hh-42784DiVA, id: diva2:1452027
Subject / course
Biology
Educational program
Conservation and Diversity, 180 credits
Supervisors
Examiners
Available from: 2020-07-06 Created: 2020-07-03 Last updated: 2020-07-06Bibliographically approved

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