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Title: Nutrient Regeneration by the Larger Net Zooplankton in the Southern Basin of Kaneohe Bay, Oahu, Hawaiian Islands 
Author: Szyper, James P; Hirota, Jed; Caperon, John; Ziemann, David A
Date: 1976-10
Publisher: University of Hawaii Press
Citation: Szyper JP, Hirota J, Caperon J, Ziemann DA. 1976. Nutrient regeneration by the larger net zooplankton in the southern basin of Kaneohe Bay, Oahu, Hawaiian Islands. Pac Sci 30(4): 363-372.
Abstract: Four experiments were performed during February 1974 with
mixed zooplankton collected with .33-mm mesh in the southern basin of Kaneohe
Bay. The mean specific excretion rates multiplied by the estimated average
standing stocks of the animals gave estimates of addition to the bay waters of
ammonia, phosphate, dissolved organic nitrogen, and dissolved organic phosphorus
of 38.6,4.0,23.7, and 3.2 ng-at/liter/day, respectively. The specific excretion rates
were not significantly affected by the concentrations of animals in experimental
vessels, by the estimated concentrations of food in the environment on the days
of the experiments, nor by incubation periods of up to 4.5 hours.
The rates are comparable to those obtained from zooplankton of this general
size in environments that have rather different temperature and food levels, indicating
that size-dependent metabolic rates are the major determinant of specific
excretion rates, although feeding and temperature can affect the results of
experiments.
Two collecting devices, a conical net and a purse seine made of the same
plankton mesh, were used to assess possible effects of capture on the results. The
animals from the net hauls excreted phosphate more slowly and dissolved organic
nitrogen more rapidly than did those from the seine catches, possibly as a result of
the greater initial crowding of animals in the cod-end jar of the towed net. There
was no evidence that animals were damaged by collection and no observable
effect of initial shock.
Although principally carnivorous, the animals in these experiments (60 to
70 percent Sagitta) processed dietary nitrogen and phosphorus in a way similar
to that of the mainly herbivorous Calanus: they constructed body tissue that was
richer in nitrogen relative to phosphorus than was their food and they excreted
solutes that were relatively poorer in nitrogen than was their food.
ISSN: 0030-8870
URI: http://hdl.handle.net/10125/1171

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