Country of Origin: United States Country of Publication: United States Abstract: Concentrations of /sup 239 + 240/Pu are reported in tissues of several species of reef and pelagic fish caught at 14 different atolls in the northern Marshall Islands. Several regularities that are species dependent are evident in the distribution of /sup 239 + 240/Pu among different body tissues. Concentrations in liver always exceeded those in bone and concentrations were lowest in the muscle of all fish analyzed. A progressive discrimination against /sup 239 + 240/Pu was observed at successive trophic levels at all atolls except Bikini and Enewetak, where it was difficult to conclude if any real difference exists between the average concentration factor for /sup 239 + 240/Pu among all fish, which include bottom feeding and grazing herbivores, bottom feeding carnivores, and pelagic carnivores from different atoll locations. The average concentration of /sup 239 + 240/Pu in the muscle of surgeonfish from Bikini and Enewetak was not significantly different from the average concentrations determined in these fish at the other, lesser contaminated atolls. Concentrations among all 3rd, 4th, and 5th trophic level species are highest at Bikini where higher environmental concentrations are found. The reasons for the anomalously low concentrations in herbivores from Bikini and Enewetak are not known.; Major Descriptors: *AQUATIC ECOSYSTEMS -- RADIONUCLIDE MIGRATION; *FISHES -- RADIONUCLIDE KINETICS; *FOOD CHAINS -- RADIONUCLIDE MIGRATION; *PLUTONIUM 239 -- RADIOECOLOGICAL CONCENTRATION; *PLUTONIUM 239 -TISSUE DISTRIBUTION; *PLUTONIUM 240 -- RADIOECOLOGICAL CONCENTRATION; *PLUTONIUM 240 -- TISSUE DISTRIBUTION Descriptors: CONTAMINATION; LIVER; MARSHALL ISLANDS; MUSCLES; PACIFIC OCEAN ; SEAWATER; SKELETON Broader Terms: ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; ANIMALS; AQUATIC ORGANISMS; BODY; DIGESTIVE SYSTEM; DISTRIBUTION; ECOLOGICAL CONCENTRATION; ECOSYSTEMS; ENVIRONMENTAL TRANSPORT; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; GLANDS; HEAVY NUCLEI; HYDROGEN COMPOUNDS; ISLANDS; ISOTOPES; MASS TRANSFER; MICRONESIA; NUCLEI; OCEANIA; ORGANS; OXYGEN COMPOUNDS; PLUTONIUM ISOTOPES; RADIOISOTOPES; SEAS; SURFACE WATERS; VERTEBRATES; WATER; YEARS LIVING RADIOISOTOPES Subject Categories: 560172* -- Radiation Effects -- Nuclide Kinetics & Toxicology -- Animals -- (-1987) 520302 -- Environment, Aquatic -- Radioactive Materials Monitoring & Transport -- Aquatic Ecosystems & Food Chains -- (-1987) INIS Subject Categories: C21* -- Tissue Distribution, Metabolism, Toxicology & Removal of Radionuclides C22 -- Radionuclide Ecology Author(s): Leviten, P.J. Kohn, A.J. Affiliation: Univ. of Washington, Seattle Source: Ecol. Monogr. (United States) v 50:1. Publication Date: Mar 1980 p 55-75 Contract Number (DOE): AT~(29-2)-266; Document Type: Journal Article Language: English Journal Announcement: EDB8010 Subfile: ERA Center). (Energy Research Coden: ECMOA AT-(26-1)-628 Abstracts); TIC (Technical 9004003 10/5/861 (Item 561 from file: 103) 00673289 ERA-05-037175; EDB-80-112816 Title: Microhabitat resource use, activity patterns, and episodic catastrophe: Conus on tropical intertidal reef rock benches Information Country of Origin: United States Abstract: Low species richness (five to nine species) and high population density (means of 0.2-8.6 individuals per square metre) characterize Conus assemblages on intertidal benches throughout the tropical Indo-West Pacific region. Data from 16 such habitats in Hawaii, Marshall Islands, Australia, Maldives, and Seychelles indicate that Similarity of microhabitats between species is equal to or greater than random expectation. Significant between-species differences in zonation