OLR (1986) 33 (12) E. Biological Oceanography 1025

Gravenhurst Bay (Ontario). Ontario Min. of the Environ., Rexdale, ON, Canada. (gsb)

86:6995 Park, Y.C., E.J. Carpenter and P.G. Falkowski, 1986.

Ammonium excretion and glutamate dehydro- genase activity of zooplankton in Great South Bay, New York. J. Plankt. Res., 8(3):489-503.

In Great South Bay, nanoplankton accounted for the largest fraction (56%) of zooplankton glutamate dehydrogenase activity over a one-year period. Microzooplankton and macrozooplankton account- ed for 20% and 24%, respectively. Total zooplankton ammonium regeneration in Great South Bay could account for 74% of the ammonium requirement by phytoplankton in winter, but in summer when demand was greater, and zooplankton population was low, it supplied less than 5%. This study suggests that the smallest zooplankton fraction (~20 ~m) can be the most important as regards nitrogen regen- eration in estuarine environments. Mar. Sci. Res. Center, SUNY, Stony Brook, NY 11794, USA.

86:6996 Pr~zelin, B.B., M. Putt and H.E. Glover, 1986.

Diurnal patterns in photosynthetic capacity and depth-dependent photosynthesis-irradiance rela- tionships in ,Synechococcus spp. and larger phy- toplankton in three water masses in the northwest Atlantic Ocean. Mar. Biol., 91(2):205-217.

Three size classes (0.6-1 #m, 1-5 /~m, and ~ 5 /~m) were examined for composition, photosynthetic capacity (chlorophyll-based and cell based), and P-I parameters over a range of depths at a neritic frontal station, a warm-core eddy, and Wilkinson's Basin during summer 1984. Maxima in photosynthetic capacity was observed midday for all size classes in upper layers, and at dawn for those near the bottom of the euphotic zone. The smaller, Synechococcus- dominated fractions had lower assimilation rates than the larger phytoplankton group. Depth-de- pendent low-light photoadaptation, photoinhibition, and saturation intensities are discussed. Oceanic Biol. Gr., Univ. of Calif., Santa Barbara, CA 93106, USA. (gsb)

86:6997 Rudjakov, J.A., 1986. Diurnal changes of occurrence

frequency of some zooplankton species off Cali- fornia. Okeanologiia, 26(2):295-299. (In Russian, English abstract.)

86:6998 Sakshaug, Egil and Osmund Holm-Hansen, 1986.

Photoadaptation in Antarctic phytoplankton: var- iations in growth rate, chemical composition and P versus I curves. J. Plankt. Res., 8(3):459-473.

In culture experiments, chl/C ratio varied from 0.004 to 0.018, with lowest values at photon flux densities (PFD) ~500 /~E m 2sl and <40-50 /rE m2s ~. C:N:P, Si/C, and ATP/C ratios were also deter- mined. Short term incubations yielded P vs I curves which indicated little inter-sample variation in maximum carbon turnover rate. Low initial slope of P vs L low I~,, and poor tolerance of high PFDs characterized low-biomass communities, but not Odontella weissflogii-dominated communities. The importance of water column stability and mixing is discussed. Trondheim Biol. St., Univ. of Trondheim, N-7000 Trondheim, Norway. (gsb)

86:6999 Smith, K.L. Jr., A.F. Carlucci, P.M. Williams, S.M.

Henrichs, R.J. Baldwin and D.B. Graven, 1986. Zooplankton and bacterioplankton of an abyssal benthic boundary layer: in--situ rates of metab- olism. Oceanologica Acta, 9(1):47-55.

Samples collected by submersible between the sediment of the Panama Basin (3850 m) and 100 m above show that macrozooplankton respiration and bacterioplankton incorporation plus respiration amount to 11% of total estimated organic carbon input to the benthic boundary layer (BBL) in the fall. Respiration integrated over the 50 m BBL was equivalent to 0.05 mg C m 2 d ~ for macrozoo- plankton and 0.30 mg C m 2 d ~ for bacterioplank- ton. Mar. Biol. Res. Div., Scripps Inst. of Oceanogr., La Jolla, CA 92093, USA. (gsb)

86:7000 Thomas, A.C. and W.J. Emery, 1986. Winter

hydrography and plankton distribution on the southern British Columbia continental shelf. Can. J. Fish. aquat. Sci., 43(6):1249-1258.

The early winter (November-December 1983) con- centrations and spatial distributions of chlorophyll and zooplankton are shown to be closely related to patterns of hydrographic parameters. Concentra- tions of both are an order of magnitude less than published summer values for the same area. Highest chlorophyll and zooplankton concentrations (1.0 mg m 3 and 2900 counts m 3) were found in Coastal Current water and the frontal zone between this and the Davidson Current water. The warmer Davidson Current water was associated with extremely low