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- Title
Dietary analysis of the herbivorous hemiramphidHyporhamphus regularis ardelio: an isotopic approach.
- Authors
Carseldine, L.; Tibbetts, I. R.
- Abstract
The stable isotope values for a range of size classes ofHyporhamphus regularis ardeliofrom Moreton Bay, south-east Australia were determined. There was a positive linear relationship betweenδ13C and standard length( LS)(δ13C = 0·034LS − 16·23;r2 = 0·78).δ13C ranged from−8·48 to−17·29‰ with the smallest size class(50 mmLS) being on average 1·04‰ enriched with respect to that of zooplankton( Temora turbinata) and 7·97‰ depleted compared toZostera capricorni.δ13C was positively correlated withLS( P < 0·01)(more enriched with increasingLS) with those fish of the largest size class(225 mmLS) being 9·86 and 0·84‰ enriched thanT. turbinataandZ. capricorni, respectively. There was no detectable trend inδ15N values withLS( P > 0·01) withδ15N, ranging from 9·18 to 11·00‰. Fish of all size classes were on average 2·32 and 7·63‰ more enriched than zooplankton and seagrass, respectively. Carbon isotope data indicate thatH. r. ardeliocommence life as carnivores and change to a diet in which seagrass is the primary carbon source. The dependence on animal matter, however, is always present. Due to the low percentage of nitrogen inZ. capricorni(2·5%) compared to zooplankton(9·1%) it appears that nitrogen from zooplankton is necessary throughout their life history with the carbon requirements for these fish coming chiefly fromZ. capricorni.
- Subjects
MORETON Bay (Qld.); QUEENSLAND; HERBIVORES; HALFBEAKS; BELONIFORMES; EXOCOETIDAE; FISH life cycles
- Publication
Journal of Fish Biology, 2005, Vol 66, Issue 6, p1589
- ISSN
0022-1112
- Publication type
Article
- DOI
10.1111/j.0022-1112.2005.00701.x