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Population Dynamics and Conservation of the Sand Lizard (Lacerta agilis) on the Edge of its Range
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Evolutionary Functional Genomics.
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The sand lizard (Lacerta agilis) reaches the northern periphery of its distribution in south-central Sweden, where small, isolated relict populations occur in pine heath forests on sandy sediments. Modern forestry and fire suppression have reduced the amount of suitable open habitat for the species in this area and seem to be important for its decline. Main objectives of this thesis were to evaluate the efficiency of different management strategies, and if the sand lizard can function as an umbrella species for biodiversity conservation.

Over a 16-year period, the estimated annual numbers of adult females in each of two study populations fluctuated between 23 and 3. Simulations of stochastic future population growth showed that the risk of extinction was highly dependent on population growth rate, which in turn was strongly affected by juvenile survival as indicated by elasticity analysis.

Simulations of population growth for 50 years showed that the quasi-extinction risk (threshold ≤ 10 females) was > 56% for patches ≤ 1 ha; which is the observed average size of suitable habitat for inhabited patches during a 10-year period. In managed metapopulation networks with highly co-fluctuating local populations, among-population dispersal was not important to reduce extinction risks over a 50-year horizon.

In the field the preferred microhabitat of sand lizards was successfully restored using tree felling and patch-soil scarification. The lizards gradually colonized the restored patches, and 16 years after restoration, sand lizards where mainly found there.

Pine-heath area, and patch area within individual pine heaths, were of major importance for long-term population persistence at regional and landscape scales, respectively. Analyses of nested species subsets and an umbrella index suggest that the sand lizard can be a useful cross-taxonomic umbrella species on both scales for other red-listed species.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2005. , p. 42
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 41
Keywords [en]
Ecology, demography, extinction, habitat, Lacerta agilis, management, metapopulation, peripheral populations, population dynamics, population viability analysis, reintroduction, reptiles, umbrella species
Keywords [sv]
Ekologi
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-5750ISBN: 91-554-6218-9 (print)OAI: oai:DiVA.org:uu-5750DiVA, id: diva2:166248
Public defence
2005-05-13, Friessalen, EBC, Norbyvägen 18, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2005-04-22 Created: 2005-04-22 Last updated: 2009-04-01Bibliographically approved
List of papers
1. Demography and management of relict sand lizard (Lacerta agilis) populations on the edge of extinction
Open this publication in new window or tab >>Demography and management of relict sand lizard (Lacerta agilis) populations on the edge of extinction
2000 (English)In: Ecological Bulletins, ISSN 0346-6868, Vol. 48, p. 123-142Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92922 (URN)
Available from: 2005-04-22 Created: 2005-04-22 Last updated: 2009-04-01Bibliographically approved
2. Sand lizard (Lacerta agilis) in Central Sweden: Modeling Juvenile Reintroduction and Spatial management Strategies for Metapopulation Establishment
Open this publication in new window or tab >>Sand lizard (Lacerta agilis) in Central Sweden: Modeling Juvenile Reintroduction and Spatial management Strategies for Metapopulation Establishment
2004 (English)In: Species Conservation and Management: Case Studies, 2004, p. 326-339Chapter in book (Other academic)
Identifiers
urn:nbn:se:uu:diva-92923 (URN)0-19-516646-9 (ISBN)
Available from: 2005-04-22 Created: 2005-04-22 Last updated: 2009-04-01Bibliographically approved
3. Habitat tracking and population dynamics of an early successional lizard in a changing pine forest landscape
Open this publication in new window or tab >>Habitat tracking and population dynamics of an early successional lizard in a changing pine forest landscape
(English)Manuscript (Other (popular science, discussion, etc.))
Identifiers
urn:nbn:se:uu:diva-92924 (URN)
Available from: 2005-04-22 Created: 2005-04-22 Last updated: 2010-01-14Bibliographically approved
4. Area-sensitivity of the sand lizard and spider wasps in sandy pine heath forests – umbrella species for early successional biodiversity conservation?
Open this publication in new window or tab >>Area-sensitivity of the sand lizard and spider wasps in sandy pine heath forests – umbrella species for early successional biodiversity conservation?
2004 (English)In: Ecological Bulletins, Vol. 51, p. 189-207Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92925 (URN)
Available from: 2005-04-22 Created: 2005-04-22 Last updated: 2009-04-01Bibliographically approved

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Citation style
  • apa
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Output format
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