1034 E. Biological Oceanography OLR (1986) 33 (12)

exposed to 252Cf in water, food, or sediments suggest that Cf bioavailability is similar to that of other transuranic nuclides. Whole body concentration factors ranged from 78 in the mollusk Venerupis decussata to 763 in the polychaete Hermione hystrix, after 3 weeks exposure to labelled seawater; depu- ration in clean water was slow. High absorption coefficients for ingested 252Cf and low transfer factors after exposure to labelled sediment were observed; both effects were species-specific. Intl. Lab. of Mar. Radioact., Musee Oceanogr. MC 98000, Monaco. (gsb)

86:7080 Guzmfin del Prro, S.A. et al., 1986. The impact of the

Ixtoc-I oil spill on zooplankton. J. Plankt. Res., 8(3):557-581.

Zooplankton data from the southern Gulf of Mexico (1979-1982) show a decrease in biomass levels of almost four orders of magnitude, lower than pre- viously observed mean biomass levels of 389 mg m 3. Seasonal biomass changes observed before and after the spill show the same pattern, with maximum in summer and minimum in spring. Changes in the organization and structure of the zooplankton community occurred after the spill, reaching a lower level of stability. Most samples appear to be contaminated by hydrocarbons, but the role of the Ixtoc-I oil spill as a factor in this is hard to determine. Decay of oil in zooplankton occurs exponentially: persistent levels of aliphatic hydro- carbons suggest a persistent pollution source, with damaging effects on plankton lower than those produced by the Ixtoc-1. Escuela Nac. de Cien. Biol., Apdo. Postal 42-186, 11340 Mexico.

86:7081 Maher, W.A., 1986. Trace metal concentrations in

marine organisms from St. Vincent Gulf, South Australia. Wat. Air Soil Pollut., 29(1):77-84. Water Res. Centre, Canberra Coll. of Adv. Ed., PO Box 1, Belconnen ACT 2616, Australia.

86:7052 Moulton, M.P. and T.W. Schultz, 1986. Comparisons

of several structure-toxicity relationships for chlorophenols. Aquat. Toxicol., 8(2):121-128. Schultz: Coll. of Vet. Med., Univ. of Tennessee, Knoxville, TN 37901-1701, USA.

86:7083 Nakajima, Akira and Takashi Sakaguchi, 1986.

Selective accumulation of heavy metals by mi- cruorganisms. Appl. Microbiol., BiotechnoL, 24(1):59-64.

Of 32 bacteria, 15 yeast, 16 fungus, and 20 actinony- cete species tested, Pseudomonas stutzeri, Neurospora sitophila, Streptomyces albus and S. viridochromogenes exhibited extremely high uranium absorption. Ura- nyl, mercury, and lead ions were selectively accu- mulated by most species. An uranium adsorption- desorption process utilizing immobilized S. albus cells is demonstrated. Sakaguchi: Dept. of Chem., Miyazaki Med. Coll., Kiyotake, Miyazaki 889-16, Japan. (gsb)

86:7084 Seki, Humitake, 1986. Thresholds in eutrophication of

natural waters. Environ. Monit. Assessment, 7(1): 39-46.

The 'health of natural waters' may be readily assessed by a combination of two routine meas- urements: bacterioplankton density and DOC. Inst. of Biol. Sci., Univ. of Tsukuba, Sakuramura, Ibaraki 305, Japan. (gsb)

86:7085 Tagatz, M.E., G.R. Plaia and C.H. Deans, 1986.

Toxicity of dibutyl phthaiate--contaminated sed- iment to laboratory- and field-colonized estua- rine benthic communities. Bull. environ. Contamin. Toxicol., 37(1):141-150. U.S. EPA, Environ. Res. Lab., Gulf Breeze, FL 32561, USA.

86:7086 Wyers, S.C., H.R. Frith, R.E. Dodge, S.R. Smith,

A.H. Knap and T.D. Sleeter, 1986. Behaviourai effects of chemically dispersed oil and subsequent recovery in Diploria strlgosa (Dana). Mar. Ecol. (P.S.Z.N. 1), 7(1):23-42. Bermuda Biol. Sta. for Res., Ferry Reach 1-15, Bermuda.

E330. Laboratory culture (rearing exper- iments, etc.)

86:7087 Hayes, J.A., D.K. Larue, J. Joyce and J.H. Schel-

lekens, 1986. Puerto Rico: reconnaissance study of the maturation and source rock potential of an oceanic arc involved in a collison. Mar. Petrol. Geol., 3(2): 126-138.

Cretaceous and Lower Tertiary rocks deposited on Puerto Rico contain >1% TOC and kerogens, mainly of the type prone to gas generation. Puerto Rico was part of the active Greater Antilles Arc prior to the Oligocene. The high geothermal gra- dients and rapid burial resulted in over-mature and mature Cretaceous rocks; however, their maturation