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- Title
Excretion and respiration rates of the scyphomedusa Aurelia aurita from the Inland Sea of Japan.
- Authors
Hidetomo Shimauchi; Shin-Ichi Uye
- Abstract
Abstract??We measured the ammonium excretion, phosphate excretion and respiration rates of the scyphomedusaAurelia auritafrom Ondo Strait, in the central part of the Inland Sea of Japan, at 28 and 20?C. The rates measured at 28?C were converted to those at 20?C using the Q10values, i.e. 1.56, 1.57 and 2.80, for ammonium excretion, phosphate excretion and respiration rates, respectively. The composite relationships between metabolic rates and wet weight of a medusa (WW, g, range 11?1330 g) at 20?C were expressed by the following allometric equations. For ammonium excretion rate (N, ?moles N medusa?1d?1):N= 0.497WW1.09, phosphate excretion rate (P, ?moles P medusa?1d?1):P= 0.453WW0.84, and respiration rate (R, ?moles O2medusa?1d?1):R= 96.9WW1.06. Mean O:N ratios (i.e. atomic ratios of 16.9 and 11.0 at 28 and 20?C, respectively) indicated that the metabolism ofA. auritamedusae was protein-dominated. These metabolic parameters enabled us to estimate the nitrogen and phosphorus regeneration rates of anA. auritamedusa population typical of early summer in the Ondo Strait (means of water temperature, medusa individual weight and population biomass: 20?C, 200 gWWand 50.8 gWWm?3, respectively). Regenerated nitrogen and phosphorus were equivalent to 10.0 and 21.6% of phytoplankton uptake rates, respectively, nearly twice that estimated for mesozooplankton, demonstrating thatA. auritamedusae are key components of the plankton community, influencing the trophic and nutrient dynamics in the Ondo Strait during early summer.
- Subjects
SEA of Japan; MOON jelly (Cnidaria); RESPIRATION; EXCRETION
- Publication
Journal of Oceanography, 2007, Vol 63, Issue 1, p27
- ISSN
0916-8370
- Publication type
Article
- DOI
10.1007/s10872-007-0003-z