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Diversitet av mossor och lavar på åkerholmar i ett öppet och ett skogsdominerat landskap
Stockholm University, Faculty of Science, Department of Physical Geography.
2015 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Diversity of mosses and lichens on midfield islets in an open and a forest-dominated landscape (English)
Abstract [sv]

De ekologiskt betydelsefulla småbiotoperna blir allt färre i det moderna jordbruket på grund av intensifieringen av jordbrukslandskapet som resulterat i ett allt mer fragmenterat landskap. För att kunna ge småbiotoper, såsom åkerholmar, ett optimalt skydd behövs flera studier om organismerna på holmarna, deras diversitet och spridning. I denna undersökning studeras artrikedomen av mossor och lavar på busk- och trädbekädda samt öppna åkerholmar i ett öppet- och ett skogsdominerat landskap. Analysen av artrikedom i studien tyder på att de finns fler arter av mossor och lavar i det öppna landskapet i förhållande till det skogsdominerade landskapet samt på de åkerholmarna som saknade busk- och trädvegetation. Dessa miljöer består av torr och stenig mark och växer igen relativt långsamt, vilket är gynnsamt för vissa mossor och lavar. Det fanns ingen signifikant korrelation mellan diversitet och storleken på åkerholmarna eller mellan diversitet och holmarnas avstånd till skog. Antalet arter i ett habitat kan bero på regionala artpoolen samt antalet potentiella kolonisatörer men även lokala processer. Vidare är det viktigt att nämna att studien tyder på att diversitet av mossor och lavar påverkas av förhållandena på holmarna, såsom busk- och trädtäckningen. Detta i kombination med en variation inom dessa små biotoper kan skapa goda förutsättningar för ett landskap med hög diversitet.

Abstract [en]

The ecologically important small remnant habitats are becoming fewer in modern agriculture due to the intensification of agricultural landscapes that have resulted in an increasingly fragmented landscape. In order to provide an ideal conservation framework for small habitats, such as midfield islets, several studies about the organisms on the islets, their diversity and distribution are needed. In this study I investigated the diversity of mosses and lichens on open midfield islets with and without shrubs and trees in an open and a forest-dominated landscape. The analysis of species diversity in the study suggests that, overall; there are more species of mosses and lichens in the open landscape in relation to the forest-dominated landscape, and on the opened islets lacking shrub and tree vegetation. These environments consist of dry and rocky soils and overgrow relatively slowly, which is favourable for mosses and lichens. There was no significant correlation between diversity and size of the midfield islets or their distance to forest. The number of species in a habitat may depend on regional species pool and the number of potential colonizers but also local processes. Furthermore, it is important to mention that the study suggests that the diversity of mosses and lichens is influenced by the conditions on the midfield islands, such as shrub and tree cover. These conditions, combined with a variation within these small habitats can create good conditions for a landscape with high diversity.

Place, publisher, year, edition, pages
2015. , 9 p.
Keyword [en]
Diversity, mosses, lichens, midfield islets, α-diversity, γ-diversity, species richness
Keyword [sv]
Diversitet, mossor, lavar, åkerholmar, α-diversitet, γ-diversitet, artrikedom
National Category
Ecology
Identifiers
URN: urn:nbn:se:su:diva-121430OAI: oai:DiVA.org:su-121430DiVA: diva2:858054
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Available from: 2015-09-30 Created: 2015-09-30 Last updated: 2015-09-30Bibliographically approved

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