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Coastal niches for terrestrial predators: a stable isotope study
Stockholm University, Faculty of Science, Department of Botany.
Stockholm University, Faculty of Science, Department of Botany.
(English)Manuscript (Other academic)
Abstract [en]

The purpose of this study was to identify if terrestrial arthropod predators on Baltic Sea shores vary in their use of marine versus terrestrial food items, and to construct a bottom-up food web for Baltic Sea shores. The inflow of marine nutrients in the area consists mainly of marine algal detritus and emerging aquatic insects (e.g. phantom midges, Chironomidae). Diets of coastal arthropods were examined using carbon and nitrogen stable isotope analysis, and a two source mixing model was used to examine proportions of marine carbon to diets. The results suggest that spiders are the terrestrial predators mainly utilizing nutrients and energy of marine origin on Baltic Sea shores, while insect predators such as beetles and hemipterans mainly utilize nutrients and energy derived from terrestrial sources, possibly due to differences in hunting behaviour. That spiders are the predators that benefit the most from the marine inflow suggest that eventual effects of marine subsidies for the coastal ecosystem as a whole are likely mediated by spiders.

Keyword [en]
stable isotopes, marine subsides, food web, spiders
National Category
Ecology
Identifiers
URN: urn:nbn:se:su:diva-27226OAI: oai:DiVA.org:su-27226DiVA: diva2:213003
Available from: 2009-04-26 Created: 2009-04-26 Last updated: 2010-01-08Bibliographically approved
In thesis
1. The Spider and the Sea: Effects of marine subsidies on the role of spiders in terrestrial food webs
Open this publication in new window or tab >>The Spider and the Sea: Effects of marine subsidies on the role of spiders in terrestrial food webs
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The purpose of this study was to identify if terrestrial arthropod predators on Baltic Sea shores vary in their use of marine versus terrestrial food items, and to construct a bottom-up food web for Baltic Sea shores. The inflow of marine nutrients in the area consists mainly of marine algal detritus and emerging aquatic insects (e.g. phantom midges, Chironomidae). Diets of coastal arthropods were examined using carbon and nitrogen stable isotope analysis, and a two source mixing model was used to examine proportions of marine carbon to diets. The results suggest that spiders are the terrestrial predators mainly utilizing nutrients and energy of marine origin on Baltic Sea shores, while insect predators such as beetles and hemipterans mainly utilize nutrients and energy derived from terrestrial sources, possibly due to differences in hunting behaviour. That spiders are the predators that benefit the most from the marine inflow suggest that eventual effects of marine subsidies for the coastal ecosystem as a whole are likely mediated by spiders.

Place, publisher, year, edition, pages
Stockholm: Department of Botany, Stockholm University, 2009. 44 p.
Keyword
marine subsidies, food webs, stable isotopes, shore ecosystems, predators, spiders, Pardosa, algae, emerging insects
National Category
Ecology
Research subject
Plant Ecology
Identifiers
urn:nbn:se:su:diva-27227 (URN)978-91-7155-877-0 (ISBN)
Public defence
2009-06-05, föreläsningssalen, Botanicum, Lilla Frescativägen 5, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2009-05-14 Created: 2009-04-26 Last updated: 2009-04-27Bibliographically approved

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