The Use of Aquatic Field Mesocosm Studies in Risk Assessment - Editorial
(pp. 605-607)
J. L. Shaw, J. H. Kennedy

Evaluating Macroinvertebrate Population and Community Level Effects in Outdoor Microcosms: Use of In Situ Bioassays and Multivariate Analysis (pp. 608-617)
J.L. Shaw, J.P. Manning

Effects of Diazinon on Large Outdoor Pond Microcosms (pp. 618-629)
J.M. Giddings, R.C. Biever, M.F. Annunziato, A.J. Hosmer

A Modular Estuarine Mesocosm (pp. 630-637)
J.R. Lauth, G.I. Scott, D.S. Cherry, A.L. Buikema, Jr.

Effects of Colloids, Flocculation, Particle Size, and Organic Matter on the Adsorption of Hexachlorobenzene to Sediments (pp. 643-651)
R. Tye, R. Jepsen, W. Lick

The Daily Changing Pattern of Hydrogen Peroxide in New Zealand Surface Waters (pp. 652-662)
R. Herrmann

Development of an Anaerobic Sludge Respiration Inhibition Test and its use to Assess Septic Tank Safety of Consumer Products (pp. 663-669)
D.D. Vaishnav, J.W. McCabe

Persistence of Polycyclic Aromatic Compounds of Different Molecular Size and Water Solubility in Surficial Sediment of an Intertidal Sandflat (pp. 670-676)
R. J. Wilcock, G. A. Corban, G. L. Northcott, A. L. Wilkins, A. G. Langdon

Mercury Pathways in the Carson River-Lahontan Reservoir System, Nevada, USA (pp. 684-690)
J.-C.J. Bonzongo, K.J. Heim, Y. Chen, W.B. Lyons, J.J. Warwick, G.C. Miller, P.J. Lechler

Sorption of an Alcohol Ethoxylate Surfactant to Natural Sediments (pp. 684-690)
M.L. Cano, P.B. Dorn

Relative Mobilities of Atrazine, Five Atrazine Degradates, Metolachlor, and Simazine in Soils of Iowa (pp. 691-695)
E.L. Kruger, B. Zhu, J.R. Coats

Effects of Low pH on the Uptake and Distribution of ⁵⁴Mn(II) in Brown Trout (Salmo trutta) - Short Communication (pp. 708-710)
C. Rouleau, H. TJälve, J. Gottofrey

Selective Assay for Heavy Metal Toxicity Using a Fluorogenic Substrate - Short Communication (pp. 711-714)
K. Jung, G. Bitton, B. Koopman

Cytochrome P450 and Contaminant Concentrations in Nestling Black- Crowned Night-Herons and Their Interrelation with Sibling Embryos (pp. 715-721)
B.A. Rattner, M.J. Melancon, T.W. Custer, R.L. Hothem

A Toxicity Test in Artificial Soil Based on the Life-History Strategy of the Nematode Plectus acuminatus (pp. 722-727)
J.E. Kammenga, P.H.G. Van Koert, J.A.G. Riksen, G.W. Korthals, J. Bakker

Inhibition of Cytochrome P4501A by Organotins in Fish Hepatoma Cells PLHC-1
(pp. 728-735)
B.J. Brüschweiler, F.E. Würgler, K. Fent

Fate and Transport of PCBs at the New Bedford Harbor Superfund Site (pp. 736-745)
L.S. Garton, J.S. Bonner, A. N. Ernest, R.L. Autenrieth

Dietary Uptake Efficiency of HCBP in Channel Catfish: The Effect of Fish Contaminant Body Burden - Short Communication (pp. 746-749)
H. Dabrowska, S.W. Fisher, K. Dabrowski, A.E. Staubus

Toxicity, Survivability and Activity Patterns of Northern Bobwhite Quail Dosed with the Insecticide Terbufos - Short Communication (pp. 750-753)
R.A. Brewer, L.L. Carlock, M.J. Hooper, L.W. Brewer, G.P. Cobb, III , R.J. Kendall

Evaluation of the Developmental Toxicity of the Pesticide MCPA and of its Contaminants Phenol and Chlorocresol (pp.754-760)
G. Bernardini, O. Spinelli, C. Presutti, C. Vismara, E. Bolzacchini, M. Orlandi, R. Settimi

Bacterial Interference in Whole Effluent Toxicity Tests - Short Communication
(pp. 761-764)
D.R. Grothe, D.E. Johnson

Effects of Nutritional Renewal Frequency on Survival and Reproduction of Ceriodaphnia dubia (pp. 765-770)
B. Ferrari, J.-F. Ferard

Benzo[A]pyrene Hydroxylase and Glutathione S-Transferase Activities as Biomarkers in Lymnaea palustris (Mollusca, Gastropoda) Exposed to Atrazine and Hexachlorobenzene in Freshwater Mesocosms (pp. 771-781)
W. Baturo, L. Lagadic

Biological Effects of Polychlorinated Dibenzo-p-Dioxins, Dibenzofurans, and Biphenyls in Bald Eagle (Haliaeetus leucocephalus) Chicks (pp. 782-793)
J.E. Elliott, R.J. Norstrom, A. Lorenzen, L.E. Hart, H. Philibert, S.W. Kennedy, J.J. Stegeman, G.D. Bellward, K.M. Cheng

Evaluation of Interstitial Water as a Route of Exposure for Ammonia in Sediment Tests with Benthic Macroinvertebrates (pp. 794-801)
F.W. Whiteman, G.T. Ankley, M.D. Kahl, D.M. Rau, M.D. Balcer

DNA Strand Breakage in Freshwater Mussels (Anodonta grandis) Exposed to Lead in the Laboratory and Field (pp. 802-808)
M.C. Black, J.R. Ferrell, R.C. Horning, L.K. Martin, Jr.