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Do plants change their defence strategy from a structural defence to a chemical one as a response to heavier herbivory?
Södertörn University College, School of Life Sciences.
2005 (English)Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
Abstract [en]

To the main part, this paper is the result of a literature survey and to the minor part of a field survey. The study is found on the question of, if and why unpalatable plant species invade heavily grassed rangelands and if plants change their defence strategy from a mechanical defence to a chemical defence if the herbivory pressure increase. I conclude that defended plants do invade heavily grassed rangelands if the rangelands lose essential recourses (often nutrients) and/or the defended plants are strongly avoided by mammalian herbivores. I also conclude that plants do go from a mechanical defence strategy to a chemical strategy if their environment loses essential recourses under a threshold. This firstly depends on that mechanical defended plants can not develop a complete defence if they suffer from a shortage in the nutrient supply, and secondly of that plants in resources rich environments often have lager possibilities of responding to herbivory with regrowth. They do not therefore have to defend them self as hard as plants in environments with low supply of recourses.

Place, publisher, year, edition, pages
Huddinge: Institutionen för kemi, biologi, geografi och miljövetenskap , 2005. , 25 p.
Keyword [en]
Betespåverkan, botanik, försvarsmekanismer
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:sh:diva-310OAI: oai:DiVA.org:sh-310DiVA: diva2:15999
Uppsok
bio-/geovetenskap
Supervisors
Examiners
Available from: 2005-08-26 Created: 2005-08-26

Open Access in DiVA

fulltext(170 kB)476 downloads
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6326851e30c2ef431dc98bc6db9f9d44da296aa772276d7b1a9e3bf1ea8c8974e7e23f01
Type fulltextMimetype application/pdf

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf