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dc.contributor.author
Ishikawa, Naoto F.
dc.contributor.author
Hayashi, Fumio
dc.contributor.author
Sasaki, Yoko
dc.contributor.author
Chikaraishi, Yoshito
dc.contributor.author
Ohkouchi, Naohiko
dc.date.accessioned
2019-06-18T11:41:24Z
dc.date.available
2017-06-12T20:22:36Z
dc.date.available
2019-06-18T11:41:24Z
dc.date.issued
2017-03
dc.identifier.issn
2045-7758
dc.identifier.other
10.1002/ece3.2728
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/129622
dc.identifier.doi
10.3929/ethz-b-000129622
dc.description.abstract
The trophic discrimination factor (TDF) of nitrogen isotopes (15N/14N) within amino acids, between a stream‐dwelling dobsonfly larva (Protohermes grandis: Megaloptera; Corydalidae) and its diet (chironomid larvae), was determined in controlled feeding experiments. Last‐instar larvae of P. grandis were collected from the Yozawa‐gawa River, central Japan, and reared in the laboratory. After fed to satiation for 1 month, one group of larvae was each fed one living chironomid larva per day for 4 weeks, while a second group was starved for 8 weeks. The larvae were harvested at intervals and the nitrogen isotopic composition of glutamic acid (δ15NGlu) and phenylalanine (δ15NPhe) were determined to calculate TDF. The mean TDF of satiated and starved larvae were 7.1‰ ± 0.5‰ (n = 3) and 7.3‰ ± 0.5‰ (n = 5), respectively. Thus, the TDF for P. grandis larvae in this study was similar to that reported for other arthropods (approximately 7‰) and was independent of satiation or starvation. A previous study of wild P. grandis larvae, based on the δ15NGlu and δ15NPhe values, estimated its trophic position (TP) as approximately 2.0 ± 0.1 (n = 5), a low value close to that of algivores, although they are generally characterized as carnivores (usually accepted as TP ≥ 3). The TDF for P. grandis larvae suggests that their low TPs in nature were caused by incorporation of vascular plant‐derived amino acids (with a different δ15N profile from that of algae) and not by an unusually low TDF or by the effects of the satiation/starvation on amino acid metabolism.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Wiley
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
compound‐specific isotope analysis of amino acids
en_US
dc.subject
deamination
en_US
dc.subject
starvation
en_US
dc.subject
top predator
en_US
dc.subject
trophic position
en_US
dc.title
Trophic discrimination factor of nitrogen isotopes within amino acids in the dobsonfly Protohermes grandis (Megaloptera: Corydalidae) larvae in a controlled feeding experiment
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Ecology and Evolution
ethz.journal.volume
7
en_US
ethz.journal.issue
6
en_US
ethz.journal.abbreviated
Ecol Evol
ethz.pages.start
1674
en_US
ethz.pages.end
1679
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.identifier.nebis
010851048
ethz.publication.place
S.l.
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-06-12T20:22:48Z
ethz.source
ECIT
ethz.identifier.importid
imp593655585745514273
ethz.ecitpid
pub:192606
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-13T19:02:32Z
ethz.rosetta.lastUpdated
2021-02-15T04:49:17Z
ethz.rosetta.versionExported
true
ethz.COinS
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