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Seabirds as agents ...
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Wardle, DavidSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
(author)
Seabirds as agents of spatial heterogeneity on New Zealand's offshore islands
- Article/chapterEnglish2014
Publisher, publication year, extent ...
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2014-06-13
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Springer Science and Business Media LLC,2014
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Springer Verlag (Germany),2024
Numbers
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LIBRIS-ID:oai:slubar.slu.se:61393
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https://res.slu.se/id/publ/61393URI
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https://doi.org/10.1007/s11104-014-2172-zDOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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AimsThis study investigates how burrow-nesting, co-lonial seabirds structure the spatial patterns of soil andplant properties (including soil and leaf N) and testswhether burrow density drives these spatial patternswithin each of six individual islands that vary greatlyin burrow density.MethodsWithin individual islands, we comparedsemivariograms (SVs) with and without burrows as aspatial trend. We also used SVs to describe and comparethe spatial patterns among islands for each of 16 soil andplant variables.ResultsBurrow density within a single island was onlyimportant in determining spatial structuring in one-fifthof the island-variable combinations tested. Amongislands, some variables (i.e., soil pH,δ15N, and com-paction; microbial biomass and activity) achieved peakspatial variance on intermediate-density islands, whileothers (i.e., net ammonification, net nitrification, NH4+,NO3-) became increasingly variable on denselyburrowed islands.ConclusionsBurrow density at the within-island scalewas far less important than expected. Seabirds and otherecosystem engineers whose activities (e.g., nutrient sub-sidies, soil disturbance) influence multiple spatial scalescan increase spatial heterogeneity even at high densities,inconsistent with a"hump-shaped"relationship be-tween resource availability and heterogeneity.
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Sveriges lantbruksuniversitetInstitutionen för skogens ekologi och skötsel
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Sveriges lantbruksuniversitet
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In:Plant and Soil: Springer Science and Business Media LLC383, s. 139-1530032-079X1573-5036
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