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Aquatic subsidies transport anthropogenic nitrogen to riparian spiders.

Authors
  • Akamatsu, Fumikazu1
  • Toda, Hideshige
  • 1 Department of Environmental Sciences, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan. [email protected] , (Japan)
Type
Published Article
Journal
Environmental pollution (Barking, Essex : 1987)
Publication Date
May 01, 2011
Volume
159
Issue
5
Pages
1390–1397
Identifiers
DOI: 10.1016/j.envpol.2011.01.005
PMID: 21300424
Source
Medline
License
Unknown

Abstract

Stable nitrogen isotopic composition (δ15N) of aquatic biota increases with anthropogenic N inputs such as sewage and livestock waste downstream. Increase in δ15N of riparian spiders downstream may reflect the anthropogenic pollution exposure through predation on aquatic insects. A two-source mixing model based on stable carbon isotopic composition showed the greatest dependence on aquatic insects (84%) by horizontal web-building spiders, followed by intermediate (48%) and low (31%) dependence by cursorial and vertical web-building spiders, respectively. The spider body size was negatively correlated with the dietary proportion of aquatic insects and spider δ15N. The aquatic subsidies transported anthropogenic N to smaller riparian spiders downstream. This transport of anthropogenic N was regulated by spider's guild designation and body size.

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