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Molecular gut content analysis results are determined by various biotic factors in wolf spiders (Aranae: Lycosidae)
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).ORCID iD: 0000-0002-6011-8540
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).ORCID iD: 0000-0002-6205-611x
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).ORCID iD: 0000-0003-2220-1615
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Health Sciences (from 2013). Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).ORCID iD: 0000-0002-3813-9548
(English)Manuscript (preprint) (Other academic)
Identifiers
URN: urn:nbn:se:kau:diva-97415OAI: oai:DiVA.org:kau-97415DiVA, id: diva2:1812753
Available from: 2023-11-17 Created: 2023-11-17 Last updated: 2024-03-11Bibliographically approved
In thesis
1. Forests, Functions, and Food Webs: Riparian processes through an ecological and molecular lens
Open this publication in new window or tab >>Forests, Functions, and Food Webs: Riparian processes through an ecological and molecular lens
2023 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Riparian systems are critical ecological interfaces that have a significant impact on the surrounding aquatic and terrestrial ecosystems. The riparian and surrounding systems have significant roles in regulating energy flow, providing essential nutrients, and supporting unique species, making them important for ecosystem function. Both the aquatic and terrestrial ecosystems are reliant on the reciprocal exchange of energy subsides to maintain productive and stable food webs. Retention of forested buffers along streams during tree felling operations is a common management technique used to protect aquatic resources and conserve the surrounding ecosystem processes. Measuring the effects of forestry practices on the function and food webs of riparian predators is vital to making forest management decisions that strengthen and protect these fundamental services. Insight into predator function and predator-prey interactions using powerful molecular techniques can further the understanding of these complex systems and help to mitigate the effects of forestry practices.

This thesis explores the functional diversity, food webs, and predator-prey interactions in riparian systems impacted by forestry felling practices. I have studied the effects of clear-cutting and forested buffer zones on riparian functional diversity through the assessment of functional richness and redundancy of spider and plant communities. In addition, I have both validated and used stable isotope analysis and DNA metabarcoding to investigate the primary food sources and prey choices of riparian predators. Riparian buffer size had no direct effect on the functional richness or redundancy of riparian spiders and vascular plants. However, riparian buffer variables such as canopy closure, buffer density, and vegetation coverage did have direct impacts on both spider and plant function. Most riparian spiders and brown trout received a significant majority of their food source from the terrestrial environment and the presence or absence of a riparian buffer did not effect this outcome. However, web-weaving spiders in unbuffered systems were more likely to exploit aquatic resources as a primary food source. Overall, the responses of predator function and food webs to forestry practice are site-specific.

Abstract [en]

This thesis investigates the role of riparian systems impacted by forestry practices, examining their functional diversity, food webs, and predator-prey interactions. Clear-cutting and forested buffer zones' effects on riparian functional diversity, as well as the primary food sources of riparian predators, were studied using stable isotope analysis and metabarcoding. While buffer size did not directly impact the functional diversity of riparian spiders, brown trout, or plants, factors such as canopy closure and vegetation coverage did. Additionally, unbuffered systems impacted the prey source of web-weaving spiders.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2023. p. 61
Series
Karlstad University Studies, ISSN 1403-8099 ; 2023:34
Keywords
Riparian systems, functional diversity, stable isotope analysis, metabarcoding, Tetragnathidae, Lycosidae, forestry management, prey subsidies
National Category
Ecology
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-97332 (URN)978-91-7867-418-3 (ISBN)978-91-7867-419-0 (ISBN)
Public defence
2023-12-08, 21A342, Eva Erikssonsalen, Universitetsgatan 2, Karlstad, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council FormasKarlstad University
Available from: 2023-11-17 Created: 2023-11-07 Last updated: 2023-11-17Bibliographically approved

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Marker, JefferyLafage, DenisBergman, EvaErlandsson, Ann

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