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Dispersing diving beetles (Dytiscidae) in agricultural and urban landscapes in south-eastern Sweden
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Ecology .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Ecology .
2002 (English)In: Annales Zoologici Fennici, ISSN 0003-455X, E-ISSN 1797-2450, Vol. 39, no 2, p. 109-123Article in journal (Refereed) Published
Abstract [en]

Flying dytiscids were trapped in an agricultural landscape with wetlands in different successional stages and in two urban landscapes with young wetlands. We compared the faunas in air and in water. Hydroporus and Agabus were the most frequently trapped genera in air. Most species were trapped near water in the agricultural landscape, species characteristic of later successional stages were common in air and dominated in water. In the urban landscapes, species were mainly trapped far from water and species known to colonise new waters were common in air and in the youngest waters. Overall, females and immature adults were more common in flight catches during April-July than during August-October. Our results indicate that urbanisation would result in a less diverse fauna, but may lead to an assemblage dominated by species that are infrequent in agricultural landscapes. To obtain a rich wetland insect fauna, a wide range of wetland types is required at the landscape scale.

Place, publisher, year, edition, pages
2002. Vol. 39, no 2, p. 109-123
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-48871OAI: oai:DiVA.org:liu-48871DiVA, id: diva2:269767
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2021-09-17
In thesis
1. Diversity, dispersal, and interactions among diving beetles and mosquitoes in Swedish wetlands
Open this publication in new window or tab >>Diversity, dispersal, and interactions among diving beetles and mosquitoes in Swedish wetlands
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, I explore why biodiversity, as exemplified by diving beetle and mosquito faunas, differs between wetlands, and what environmental factors that affect and control diversity in different types of wetlands and landscapes. The study organisms, diving beetles (Dytiscidae) and mosquitoes (Culicidae), are abundant and species-rich groups in many types of wetlands. They also represent predator and prey. I have explored the diversity of diving beetles and mosquitoes along environmental gradients, along which primarily permanence, size, age, and shading, differ between wetlands. I have also studied wetlands in different types of landscapes (urban and agricultural), and in two different geographical regions (SE and SW Sweden). I have studied the colonization process of new wetlands by diving beetles, and changes in their faunas during the ecological succession of wetlands, and also migration and dispersal of diving beetles in different types of landscapes. Finally, I experimentally explored interactions between the predacious diving beetles and a potential prey - mosquito larvae. One important goal throughout the work has been to formulate advices for construction and management of wetlands, to obtain or preserve high biodiversity, both in individual wetlands as well as in whole landscapes. The results illustrate that many types of wetlands: permanent and temporary, small and large, situated in forests and in open environments, new and old ones, support high diversity of the studied organisms. Urban wetlands had generally fewer species than wetlands in agricultural landscapes, but wetlands in both types of landscapes supported unique species. The faunas differed considerably between wetland types, as many species have specific habitat requirements, but it was hard to classify faunas in specific wetland types as more "valuable" than others. Hence, to obtain a rich wetland insect fauna on a landscape level (which should be more important than to maximise diversity in individual ponds), it seems necessary to take into account more than individual wetlands or ponds. It might be vital to maintain different successional stages, and to construct new wetlands (or to rejuvenated later stages), since the early stages are short-lived, and support both rare and unique species not found in later stages. The interaction experiments, among dytiscids and mosquito larvae, showed that diving beetles (middle-sized species, 10-20 mm) significantly reduced levels of mosquito larvae. Single dytiscids could consume large numbers of such larvae. These predators are probably important in the natural control of mosquito larvae.

Place, publisher, year, edition, pages
Linköping: Linköping University, 2003. p. 45
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 796
National Category
Ecology
Identifiers
urn:nbn:se:liu:diva-179331 (URN)9173735876 (ISBN)
Public defence
2003-03-21, Planck, Fysikhuset, Linköpings universitet, Linköping, 13:15
Note

All or some of the partial works included in the dissertation are not registered in DIVA and therefore not linked in this post.

Available from: 2021-09-29 Created: 2021-09-17 Last updated: 2023-02-28Bibliographically approved

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Lundkvist, ElisabethLandin, Jan

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