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Biological Diversity of Fish and Bacteria in Space and Time
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Biological diversity is controlled by an array of factors and processes all active at different spatial and temporal scales. Regional factors control what species are available to occur locally, whereas the local factors determine what species are actually capable of colonizing the locality.

I have investigated how these local and regional factors affect species richness and diversity, mainly of fish in Swedish lakes and in order to assess the impact of dispersal mode one study on bacteria was also performed. In addition, potential first steps towards speciation were investigated in perch (Perca fluviatilis) from two different habitats.

Fish species richness and diversity were found to be regulated by history, dispersal limitation and the local environment. In addition, striking similarities were found in the control of community composition for fish and bacteria. Both were regulated by nearly equal parts regional and local factors. The study of morphological and genetical variation in perch (Perca fluviatilis) revealed genetic differentiation at small spatial scales, suggesting that genetic differences can evolve between groups at strikingly small spatial scales, which might have implications for speciation in a long time perspective.

Based on these findings I conclude that space and time matter. Space has the potential to isolate sites. And both dispersal and local extinctions, it seems, might take a long time, as effects of the last ice-age can still be seen on the contemporary fish community richness and composition.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2008. , p. 55
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 399
Keywords [en]
Ecology, species richness, fish, lake, biogeography, glacial, colonization, metacommunity, speciation, perch, bacteria, diversity
Keywords [sv]
Ekologi
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-8494ISBN: 978-91-554-7107-1 (print)OAI: oai:DiVA.org:uu-8494DiVA, id: diva2:171502
Public defence
2008-04-03, Lindahlssalen, Kärnhuset, EBC, Norbyvägen 18, Uppsala, 13:00
Opponent
Supervisors
Available from: 2008-03-12 Created: 2008-03-12 Last updated: 2022-01-28Bibliographically approved
List of papers
1. Fish species richness in lakes: the importance of local and regional processes
Open this publication in new window or tab >>Fish species richness in lakes: the importance of local and regional processes
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-96801 (URN)
Available from: 2008-03-12 Created: 2008-03-12 Last updated: 2013-02-11
2. Dispersal limitation and local processes - consequences for fish species richness and diversity
Open this publication in new window or tab >>Dispersal limitation and local processes - consequences for fish species richness and diversity
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-96802 (URN)
Available from: 2008-03-12 Created: 2008-03-12 Last updated: 2013-02-11
3. The role of environmental and spatial factors for the composition of aquatic bacterial communities
Open this publication in new window or tab >>The role of environmental and spatial factors for the composition of aquatic bacterial communities
2007 (English)In: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 88, no 9, p. 2154-2161Article in journal (Refereed) Published
Abstract [en]

This study investigates the importance of local vs. spatial factors on bacterial community composition of 35 rock pools at the Baltic Sea coast. The pools were located in five distinct spatial clusters over a total scale of <500 m and differed widely in terms of water chemistry. To determine the fractions of the variance in bacterial community composition (BCC) between rock pools that are explained by local environmental vs. spatial factors, a variance partitioning procedure using partial canonical correspondence analysis was performed. Three environmental variables (salinity, chlorophyll a concentration, and water color) had a significant effect on BCC, irrespective of the spatial location of the pools. Vice versa, there was a significant effect of spatial factors on BCC irrespective of any of the environmental factors included in this study. Hence, the patchy spatial distribution of the pools was partly reflected in the composition of the bacterial communities in the pools, which might be caused by congruent colonization events of adjacent pools, such as simultaneous sea-spray inputs or direct exchange of bacteria via connecting rivulets. This study shows that the composition of planktonic bacteria can show provincialism at small spatial scales, which is likely to be caused by -environmental conditions as well as historical events.

Keywords
Water pool, Restriction fragment length polymorphism, Spatial scale, Microorganism, Heterogeneity, Community structure, Biogeography, Bacteria, Microbial community, Composition, Environmental factor
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-96803 (URN)10.1890/06-2098.1 (DOI)000249500900002 ()17918394 (PubMedID)
Available from: 2008-03-12 Created: 2008-03-12 Last updated: 2022-01-28
4. Connectivity vs. local environment as structuring forces in lake fish communities
Open this publication in new window or tab >>Connectivity vs. local environment as structuring forces in lake fish communities
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-96804 (URN)
Available from: 2008-03-12 Created: 2008-03-12 Last updated: 2013-02-11
5. Small scale genetic and morphological differentiation in sympatric Eurasian perch
Open this publication in new window or tab >>Small scale genetic and morphological differentiation in sympatric Eurasian perch
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-96805 (URN)
Available from: 2008-03-12 Created: 2008-03-12 Last updated: 2010-01-13Bibliographically approved

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