Carbon source and trophic position of pelagic fish in coastal waters of south-eastern Izu Peninsula, Japan, identified by stable isotope analysis

It is important to clarify trophic dynamics in marine ecosystems for management of the fishing ground. Organic carbon sources and trophic position of pelagic fishes in the coastal waters of the south‐eastern Izu Peninsula, Japan, were examined on the basis of carbon and nitrogen stable isotope distr...

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Bibliographic Details
Published in:Fisheries science 2007-06, Vol.73 (3), p.593-608
Main Authors: Takai, N.(Nihon Univ., Shimoda, Shizuoka (Japan). Coll. of Bioresource Sciences), Hirose, N, Osawa, T, Hagiwara, K, Kojima, T, Okazaki, Y, Kuwae, T, Taniuchi, T, Yoshihara, K
Format: Article
Language:English
Subjects:
AGUAS COSTERAS
AZOTE
CARBON
carbon source
Carbon sources
CARBONE
CARBONO
COASTAL WATERS
EAUX COTIERES
ECOSISTEMA
ECOSYSTEME
ECOSYSTEMS
Engraulis japonica
engraulis japonicus
Fishing
Fishing zones
ISOTOPE
ISOTOPES
ISOTOPOS
Izu Peninsula
Larvae
Marine
Marine ecosystems
NITROGEN
NITROGENO
NIVEAU TROPHIQUE
NIVELES TROFICOS
Organic carbon
Particulate organic matter
PECES MARINOS
pelagic fish
Phytoplankton
POISSON DE MER
SALTWATER FISHES
Scorpaeniformes
stable isotope
Stable isotopes
Surf
TROPHIC LEVELS
trophic position
Water column
δ13C
δ15N
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Summary:It is important to clarify trophic dynamics in marine ecosystems for management of the fishing ground. Organic carbon sources and trophic position of pelagic fishes in the coastal waters of the south‐eastern Izu Peninsula, Japan, were examined on the basis of carbon and nitrogen stable isotope distributions. The δ13C of the fishes was mostly distributed from −19 to −16‰ for nektonic fishes (13 species of adults and immatures) and planktonic fishes (10 species of larvae and juveniles), close to the δ13C values of particulate organic matter and planktonic decapods. These δ13C signatures for the inhabitants of the water column were in contrast with the high δ13C values (mainly −16 to −13‰) for demersal fishes of Scorpaeniformes and benthic polychaetes collected in the surf zone. These results indicate that nektonic and planktonic fishes depend on phytoplankton for carbon supply. The δ15N signatures suggest that the trophic position ranged 3.1–4.5 for the nektonic fishes and 2.9–3.7 for the planktonic fishes, premised on trophic level 3 for larval Japanese anchovy Engraulis japonicus. Thus, planktivorous fishes should be mainly assigned to trophic levels 3 and 4 in this area.
ISSN:0919-9268
1444-2906
DOI:10.1111/j.1444-2906.2007.01372.x