Trophic ecology of the seagrass-inhabiting footballer demoiselle Chrysiptera annulata (Peters, 1855); comparison with three other reef-associated damselfishes
stable isotopes; siber; isotopic niche; pomacentridae; coraf reef; trophic ecology; Toliara; Western Indian ocean; reef fish
Abstract :
[en] Many damselfishes (Pomacentridae) are herbivorous or omnivorous with an important contribution of different kinds of algae in their diet. They display different levels of territoriality and farming behavior, from almost non territorial to monoculture farmers. In addition, few species inhabit seagrass meadows but, presently, none can be considered as seagrass-eating specialists. The footballer demoiselle, Chrysiptera annulata, is found in the seagrass meadows on the reef flat of the Great Reef of Toliara (Madagascar, Mozambique Channel). Regarding this unusual habitat for pomacentrid, this study aimed to answer 3 questions: 1) What is the diet of C. annulata? 2) Do the resources supporting this diet include seagrass? 3) Does its trophic niche overlap those of other sympatric damselfishes (Pomacentrus trilineatus, Chrysiptera unimaculata and Plectroglyphidodon lacrymatus) living in close association with macrophytes or eating algae? Stomach content examination and stable isotope analysis showed that the footballer demoiselle is not a seagrass consumer but is an omnivorous/herbivorous species heavily relying on algal resources and small invertebrates. SIAR, a stable isotope mixing model, indicated it assimilated large amount of turf algae and various benthic or planktonic invertebrates in lower proportions. SIBER metrics pointed out that isotopic niche of the footballer demoiselle partly overlaps the one of its congeneric C. unimaculata, but not those of P. trilineatus and P. lacrymatus. Trophic strategies of C. annulata differed both from farming species such as P. lacrymatus or from less territorial herbivores such as P. trilineatus. Its seagrass meadow habitat on the Great Reef of Toliara allow the conquest of an unusual habitat for damselfishes and could limit competition with C. unimaculata, a species displaying the same territorial behavior and the same isotopic niche but living on the reef itself.
Research Center/Unit :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Lepoint, Gilles ; Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Michel, Loïc ; Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Parmentier, Eric ; Université de Liège > Département de Biologie, Ecologie et Evolution > Morphologie fonctionnelle et évolutive
Frederich, Bruno ; Université de Liège > Département de Biologie, Ecologie et Evolution > Morphologie fonctionnelle et évolutive
Language :
English
Title :
Trophic ecology of the seagrass-inhabiting footballer demoiselle Chrysiptera annulata (Peters, 1855); comparison with three other reef-associated damselfishes
Publication date :
2016
Journal title :
Belgian Journal of Zoology
ISSN :
0777-6276
eISSN :
2295-0451
Publisher :
Royal Belgian Zoological Society, Bruxelles, Belgium
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