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Land use effects on ecological linkages between small streams and their surrounding terrestrial habitats

Carlson, Peter (2014). Land use effects on ecological linkages between small streams and their surrounding terrestrial habitats. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2014:18
ISBN 978-91-576-7984-0
eISBN 978-91-576-7985-7
[Doctoral thesis]

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Adult aquatic insects are important vectors for aquatic transfers to terrestrial consumers and an integral component of riparian and terrestrial food webs. Incorporation of aquatic subsidies into terrestrial food webs depends heavily on the dispersal and life history traits of aquatic insects. Agricultural land use often results in the degradation of in-stream and riparian habitats which may affect the efficiency of cross-habitat exchanges.

In this thesis I studied; (i) how land use (forested and agriculture) affects stream invertebrate assemblages, with special focus on aquatic insects, (ii) how riparian habitats differ with land use and how these differences affect dispersal of emerged adult aquatic insects, and (iii) if the distribution of riparian arthropod consumers is related to food resources (aquatic and terrestrial dipterans) and/or riparian habitat (e.g., substratum and microclimate).

Subsidy production (abundances of adult aquatic insects) was over five times greater in agricultural streams, however, most emerging insects dispersed no further than 10m from the stream edge. In contrast, dispersal of adult aquatic insects declined little with distance in the forested sites. Furthermore, the abundance of arthropod consumers was lower at agricultural sites, compared to forested sites. Taken together, these results indicate that agricultural practices result in reduced subsidy resource exchange efficiency, where energy flow to riparian habitats is weakened relative to the productivity of the stream. Specifically, cross-habitat transfers are constrained by factors associated with land use, microhabitat and phenology.

Land use has been largely ignored in studies of aquatic to terrestrial cross-habitat resource exchanges. This thesis illustrates the interdependence of spatial resources and how anthropogenic alterations can disrupt cross-scale linkages. This thesis brings attention to the importance of aquatic-terrestrial linkages in forested and agricultural landscapes, demonstrating that anthropogenic impacts may have deeper consequences for aquatic and terrestrial ecosystems than have been previously identified.

Authors/Creators:Carlson, Peter
Title:Land use effects on ecological linkages between small streams and their surrounding terrestrial habitats
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :27 February 2014
Number of Pages:56
I.Carlson, P.E., Johnson, R.K., McKie, B.G. (2013). Optimizing stream bioassessment: habitat, season, and the impacts of land use on benthic macroinvertebrates. Hydrobiologia 704(1), 363-373.
II.Sandin, L., McKie, B.G., Carlson, P.E., Johnson, R.K. Difference in resource transfer potential between stream and terrestrial habitats revealed by dispersal traits. (manuscript).
III.Carlson, P.E., McKie, B.G., Sandin, L., Johnson, R.K. Strong land use effects on the dispersal patterns of emerged stream insects: implications for transfers of aquatic subsidies to terrestrial consumers. (manuscript).
IV.Carlson, P.E., McKie, B.G., Johnson, R.K. Cross-habitat linkages between aquatic insect subsidies and terrestrial arthropods: interacting influences of land use and microhabitat. (manuscript).
Place of Publication:Uppsala
Publisher:Dept. of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7984-0
ISBN for electronic version:978-91-576-7985-7
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:M Aquatic sciences and fisheries > M40 Aquatic ecology
P Natural resources > P01 Nature conservation and land resources
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Agrovoc terms:rivers, riparian zones, habitats, land use, aquatic insects, arthropoda, food chains, agriculture
Keywords:land use, habitat, traits, dispersal, subsidies, riparian, streams, arthropods, aquatic
Permanent URL:
ID Code:11038
Faculty:NL - Faculty of Natural Resources and Agricultural Sciences (until 2013)
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: Peter Carlson
Deposited On:28 Feb 2014 12:22
Metadata Last Modified:02 Dec 2014 11:05

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