Efficient uptake of algal production by a single resident herbivorous fish on the reef
Identifieur interne : 000845 ( Main/Exploration ); précédent : 000844; suivant : 000846Efficient uptake of algal production by a single resident herbivorous fish on the reef
Auteurs : N. V. C. Polunin [Papouasie-Nouvelle-Guinée]Source :
- Journal of Experimental Marine Biology and Ecology [ 0022-0981 ] ; 1988.
Abstract
Daily ingestion in the winter by the herbivorous territorial reef-dwelling jewel damselfish Plectroglyphidodon lacrymatus (Quoy et Gaimard) was measured at Motupore Island, Papuan Coastal Lagoon, southern Papua New Guinea, using two independent techniques. A gut-filling/feeding-activity method gave a rate of 1.52 g dry wt · day−1 for each fish, while a defecation/absorption method gave 1.62 g dry wt · day−1; ingestion was taken to be the average of these two estimates (1.57 g dry wt · day−1). The mean planar area of territories was 0.43 m2, and the mean surface-area index of the outer reef-flat/upper reef-slope sites involved was 1.82 m2 · m−2. After measuring the C (39.9 %), N (4.3 %), and P (0.43 %) contents of the food, in the winter the fish was found to take up daily 1.43g C · m−2, 0.14 gN ·m −2 and 0.014 gP·m−2 of territory. Thus, the C: N: P atomic ratio of the turf-algal food was 263: 22: 1. Using laboratory respirometry, and surface light intensity and extinction data, daily net turf-algal production in the winter was 1.09–1.10gC · m−2 on experimental plates, and 1.98–2.00 g C · m−2 in territories. Thus P. lacrymatus consumed > 70% of the net community C fixation in its territory in the winter. The fish ingested an especially large part of the N (91%; 42% of P) incorporated into the algal community, and, thus, “spatially focused” fluxes particularly of N within its territory. Substantial quantities of C, N, and P(310 mg C · m−2 day−1; 13 mg N · m−2 · day−1; 6 mg P · m−2 · day−1) were defecated and probably contributed to temporary pools of these elements in the reef interstitial water. Dietary absorption by the fish was high: 91.7% for N (76.5% in summer), 78.4% for C (58.3% in summer), and 61.4% for P (only summer data available). Organics were absorbed in the first 25% of the gut length. P. lacrymatus ingested 15% of its body N, 24% of C, and 37% of total material daily by mass.
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DOI: 10.1016/0022-0981(88)90109-8
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