Abstract
The respective roles of regular echinoids and scarid fishes in the transformation of turf algae, the main food resource for reef herbivores, were investigated on French Polynesian coral reefs. The role of one species of parrotfish (Scarus sordidus) was compared with that of four species of echinoids. The degree and ways of degradation of the algal matter were determined by the organic matter percentage, the composition of the sugar fraction, and the concentration and composition of chlorophylltype pigments as assayed by HPLC analysis. Chemical analyses were performed on anterior and posterior intestines for scarids, intestinal contents and faeces for echinoids, and on fresh algal turf as a control of initial food quality. A decrease in mean percentage of organic matter in gut content was observed from intestine (9.7%) to faeces (7%) in sea urchins, but not in parrotfishes. The total sugar fraction decreased from fresh algal turf (32% of total organic matter) to echinoid (28%) to scarid (18%) gut contents. The ratio of insoluble to soluble sugars (I/S ratios) was higher in echinoids (2.6) than in scarid gut contents (1.0). A decrease in the total pigment concentration was measured from fresh algal turf to echinoid and it was found to be even lower in scarid gut contents. Chromatograms showed that the composition of chlorophyll-type pigments in scarid intestines was very similar to fresh algal turf, with a dominance of native forms, mainly chlorophyll a and b. On the contrary, degraded pigment forms dominated in echinoids. The main degraded products were pheophorbides in sea urchins, and chlorophyllides in parrotfishes. These results provided evidence for differentiation in digestive processes occurring in the two types of grazers. Echinoids released higher degraded algal material than did scarids. Thus, these two types of grazers play different roles in the recycling of organic matter on coral reefs.
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References
Al-Hussaini AH (1947) The feeding habits and the morphology of the alimentary tract of some teleosts living in the neighbourhood of the Marine Biological Station, Ghardaqa, Red Sea. Mar Biol Stat Ghardaqa 5:1–61
Bailey TG, Robertson DR (1982) Organic and caloric levels of fish feces relative to its consumption by coprophagous reef fishes. Mar Biol 69:45–50
Bak RPM (1990) Patterns of echinoid bio-erosion in two Pacific coral reef lagoons. Mar Ecol Prog Ser 66:267–272
Bellwood DR, Choat JH (1990) A functional analysis of grazing in parrotfishes (family Scaridae): the ecological implications. Environ Biol Fish 28:189–214
Bouchon C (1985) Quantitative study of Scleractinian coral communities of Tiahura reef (Moorea Island, French Polynesia). Proc 5th Int Coral Reef Symp 6:279–284
Carpenter RC (1986) Partitioning herbivory and its effects on coral reef algal communities. Ecol Monogr 56:345–363
Choudhury D (1988) Herbivore induced changes in leaf-litter resource quality: a neglected aspect of herbivory in ecosystem nutrient dynamics. Oikos 51:389–393
Compiano AM, Romano JC (1988) Amino acids and monosaccharides in sediments in the vicinity of an urban sewer. Mar Environ Res 25:291–313
Dubois M, Gilles KA, Hamilton JK, Rebers PA, Smith F (1956) Colorimetric method for determination of sugars and related substances. Anal Chem 28:350–356
Galzin R, Pointier JP (1985) Moorea Island, Society Archipelago. Proc 5th Int Coral Reef Symp 1:73–101
Geesey GG, Alexander GV, Bray RN, Miller AC (1984) Fish fecal pellets are a source of minerals for inshore reef communities. Mar Ecol Prog Ser 15:19–25
Gerchakov SM, Hatcher PG (1972) Improved technique for analysis of carbohydrates in sediments. Limnol Oceanogr 17:938–943
Gohar HAF, Latif AFA (1961) The histology of the alimentary tract in representative scarid and labrid fishes from the Red Sea. Publ Mar Biol Sta Al-Ghardaqa 11:25–126
Handa N, Yanagi K, Matsunaga K (1972) Distribution of detrital materials in the Western Pacific Ocean and their biochemical nature. Mem Ist Ital Idrobiol 29 [Suppl]:53–71
Harmelin-Vivien ML (1979) Ichtyofaune des récifs coralliens de Tulear (Madagascar): Ecologie et relations trophiques. Thèse Doc ès-Sciences, Univ Aix-Marseille II
Hay ME (1984) Patterns of fish and urchin grazing on Caribbean coral reefs: are previous results typical? Ecology 65:446–454
Hobson ES (1974) Feeding relationships of Teleostean fishes on coral reefs in Kona, Hawaii. Fish Bull 72:915–1031
Horn MH (1989) Biology of marine herbivorous fishes. Oceanogr Mar Biol Annu Rev 27:167–272
Hutchings PA (1986) Biological destruction of coral reefs. Coral Reefs 4:239–252
Jangoux M, Lawrence JM (1982) Echinoderm nutrition. Balkema, Rotterdam
La Giraudière I de, Laborde P, Romano JC (1989) HPLC determination of chlorophylls and breakdown-products in surface microlayers. Mar Chem 26:189–204
Lewis JB (1964) Feeding and digestion in the tropical sea-urchin Diadema antillarum Philippi. Can J Zool 42:549–557
Lobel PS (1981) Trophic biology of herbivorous reef fishes: alimentary pH and digestive capabilities. J Fish Biol 19:365–397
Mantoura RFC, Llewellyn CA (1983) The rapid determination of algal chlorophyll and carotenoid pigments and their breakdown products in natural waters by reverse-phase high-performance liquid chromatography. Anal Chim Acta 151:297–314
Morrison D (1988) Comparing fish and urchin grazing in shallow and deeper coral reef algal communities. Ecology 69:1367–1382
Ogden JC (1977) Carbonate-sediment production by parrot fish and sea urchins on Caribbean reefs. In: Frost SH, Weiss MP, Saunders JB (eds) Reefs and related carbonates-ecology and sedimentology. Am Assoc Petrol Geol Tulsa 4:281–288
Ogden JC, Lobel PS (1978) The role of herbivorous fishes and urchins in coral reef communities. Environ Biol Fish 3:49–63
Robertson DR (1982) Fish feces as fish food on a Pacific coral reef. Mar Ecol Prog Ser 7:253–265
Rothans TC, Miller AC (1991) A link between biologically imported particulate organic nutrients and the detritus food web in reef communities. Mar Biol 110:145–150
Russ G (1984) Distribution and abundance of herbivorous grazing fishes in the Central Great Barrier Reef: 1-Level of variability across the entire continental shelf. Mar Ecol Prog Ser 20:23–34
Siegel S (1956) Nonparametric statistics for the behavioral sciences. McGraw-Hill, New York
Smith RL, Paulson AC (1974) Food transit times and gut pH in two Pacific parrot fishes. Copeia 1974(3):796–799
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Harmelin-Vivien, M.L., Peyrot-Clausade, M. & Romano, JC. Transformation of algal turf by echinoids and scarid fishes on French Polynesian coral reefs. Coral Reefs 11, 45–50 (1992). https://doi.org/10.1007/BF00291934
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DOI: https://doi.org/10.1007/BF00291934