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Diet and endogenous carbohydrases in the temperate marine herbivorous fish Kyphosus sydneyanus

Moran, Damian LU and Clements, K. D. (2002) In Journal of Fish Biology 60(5). p.1190-1203
Abstract
Stomach content analysis showed that Kyphosus sydneyanus collected by spearing from coastal reefs near Leigh, north-east New Zealand, is herbivorous throughout its post-settlement life. All size classes collected consumed a wide range of macroalgae, predominantly the phaeophytes Carpophyllum maschalocarpum and Ecklonia radiata, and the rhodophytes Gigartina macrocarpa and Caulacanthus ustulatus. Multivariate analysis of variance and discriminant function analysis showed an ontogenetic diet shift, with gut contents dominated by rhodophytes and chlorophytes in juveniles and by phaeophytes in adults. No significant seasonal variation in diet was apparent for any size class. Amylase and amylopectinase activity was highest in the smaller size... (More)
Stomach content analysis showed that Kyphosus sydneyanus collected by spearing from coastal reefs near Leigh, north-east New Zealand, is herbivorous throughout its post-settlement life. All size classes collected consumed a wide range of macroalgae, predominantly the phaeophytes Carpophyllum maschalocarpum and Ecklonia radiata, and the rhodophytes Gigartina macrocarpa and Caulacanthus ustulatus. Multivariate analysis of variance and discriminant function analysis showed an ontogenetic diet shift, with gut contents dominated by rhodophytes and chlorophytes in juveniles and by phaeophytes in adults. No significant seasonal variation in diet was apparent for any size class. Amylase and amylopectinase activity was highest in the smaller size classes. Laminarinase activity was relatively low throughout all size classes, and did not correlate with the ontogenetic increase in phaeophyte consumption. The activity of endogenous enzymes hydrolysing starch broadly correlated with rhodophyte consumption in adult specimens of three other species of marine herbivorous fishes: Odax pullus, Girella tricuspidata and Parma alboscapularis; laminarin hydrolysis, however, was negatively correlated with phaeophyte consumption. Overall, the diet and enzyme results suggest that juvenile K. sydneyanus rely mainly on the endogenous digestion of rhodophytes and chlorophytes, while exogenous (microbial) digestion is used to digest the phaeophyte-dominated diet of adults. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
herbivory, diet, algae, digestion, Kyphosus sydneyanus
in
Journal of Fish Biology
volume
60
issue
5
pages
1190 - 1203
publisher
Wiley-Blackwell
external identifiers
  • scopus:0036587976
ISSN
0022-1112
DOI
10.1111/j.1095-8649.2002.tb01714.x
language
English
LU publication?
no
id
59e2f112-4c19-477d-9e8c-6711d84e6b14 (old id 1981413)
alternative location
http://www.blackwell-synergy.com/doi/abs/10.1111/j.1095-8649.2002.tb01714.x
date added to LUP
2011-06-21 17:00:14
date last changed
2017-11-19 03:31:30
@article{59e2f112-4c19-477d-9e8c-6711d84e6b14,
  abstract     = {Stomach content analysis showed that Kyphosus sydneyanus collected by spearing from coastal reefs near Leigh, north-east New Zealand, is herbivorous throughout its post-settlement life. All size classes collected consumed a wide range of macroalgae, predominantly the phaeophytes Carpophyllum maschalocarpum and Ecklonia radiata, and the rhodophytes Gigartina macrocarpa and Caulacanthus ustulatus. Multivariate analysis of variance and discriminant function analysis showed an ontogenetic diet shift, with gut contents dominated by rhodophytes and chlorophytes in juveniles and by phaeophytes in adults. No significant seasonal variation in diet was apparent for any size class. Amylase and amylopectinase activity was highest in the smaller size classes. Laminarinase activity was relatively low throughout all size classes, and did not correlate with the ontogenetic increase in phaeophyte consumption. The activity of endogenous enzymes hydrolysing starch broadly correlated with rhodophyte consumption in adult specimens of three other species of marine herbivorous fishes: Odax pullus, Girella tricuspidata and Parma alboscapularis; laminarin hydrolysis, however, was negatively correlated with phaeophyte consumption. Overall, the diet and enzyme results suggest that juvenile K. sydneyanus rely mainly on the endogenous digestion of rhodophytes and chlorophytes, while exogenous (microbial) digestion is used to digest the phaeophyte-dominated diet of adults.},
  author       = {Moran, Damian and Clements, K. D.},
  issn         = {0022-1112},
  keyword      = {herbivory,diet,algae,digestion,Kyphosus sydneyanus},
  language     = {eng},
  number       = {5},
  pages        = {1190--1203},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Fish Biology},
  title        = {Diet and endogenous carbohydrases in the temperate marine herbivorous fish Kyphosus sydneyanus},
  url          = {http://dx.doi.org/10.1111/j.1095-8649.2002.tb01714.x},
  volume       = {60},
  year         = {2002},
}