790 E. Biological Oceanography OLR (1982) 29 (12)

82:6193 Yntema, C.L. and N. Mrosovsky, 1982. Critical

periods and pivotal temperatures for sexual differentiation in loggerhead sea turtles. Can. J. Zool., 60(5):1012-1016.

Caretta caretta eggs were incubated at constant temperatures ranging 24-34°C. At temperatures >32°C all embryos developed into females; at < 28°C, all males. At 30°C there were approximately equal numbers of both sexes. Sexual differentiation is not determined by temperature throughout in- cubation but during a critical period (somewhere between stages 12 and 22) of embryonic devel- opment. Mrosovsky: Dept. of Zool., Univ. of Toronto, Ont., M5S IAI, Canada.

El l0 . Bottom communities

82:6194 Bay, Daniel, 1982. In-situ study of the metabolism of

three infraiittorai benthic communities of the Aqaba Gulf. C. r. hebd. S~anc. Acad. Sci., Paris, (III)294(11):463-466. (In French, English ab- stract.) Station Stareso, Univ. de Liege, B.P. no. 33, 20260 Calvi, Haute-Corse, France.

82:6195 Bell, S.S. and L.D. Coen, 1982. Investigations on

epihenthic meiofauna. II. Influence of micro- habitat and macroalgae on abundance of small invertebrates on Diopatra cuprea (Bosc) (Poly- chaeta: Onuphidae) tube-caps in Virginia. J. expl mar. Biol. Ecol., 61(2):175-188.

Nematodes, harpacticoid copepods and polychaetes were the most numerous taxa on the tube-caps. Meiofauna abundance was not affected by tube-cap density or complexity; presence of the macroalga Ulva significantly increased the number of meio- fauna. Results were compared with data from a similar study in Florida. Dept. of Biol., Univ. of South Florida, Tampa, Fla. 33620, USA. (msg)

82:6196 Bondartchuck, L.L. et al., 1980. Ecological inves-

tigations of the shelf. Trudy Inst. Okeanol. P. P. Shirshova, 1980:1-98; 10 papers. (In Russian, English abstracts.)

This collection covers algal seasonality, anemone feeding behavior and effects of pollution on benthic diatoms of the White Sea; Chukchi Sea benthos; techniques for trophic analysis of amphipods; Southern Hemisphere cold-water brachiopods; pale- obenthic productivity determinations; polychaete

distribution; and Benthoctopus sibiricus in the eastern Arctic. (isz)

82:6197 Chandran, R., G.S. Thangaraj, V. Sivakumar, B.

Srikrishnadhas and K. Ramamoorthi, 1982. Ecology of macrohenthos in the Vellar Estuary least India]. Indian J. mar. Sci., 11(2):122-127.

Macrobenthos in 3 different (marine, gradient and tidal) zones comprised polychaetes, bivalves, gas- tropods and crustaceans; distribution was studied in relation to seasonal changes of bottom salinity, temperature, oxygen, pH, bacterial population, total organic carbon and physical nature of the sub- stratum. A rapid depletion of benthos occurred during the NE monsoon. Centre of Adv. Study in Mar. Biol., Annamalai Univ., Porto Novo 608 502, India.

82:6198 Commito, J.A., 1982. Importance of predation by

infaunai polychaetes in controlling the structure of a soft-bottom community in Maine, USA. Mar. Biol., 68(1):77-81.

Density of the abundant (63% of the total number of individuals in the benthic community) amphipod Corophium volutator was reduced in the presence of Nereis virens adults, and also was negatively corre- lated with the total density of all other infaunal species, indicating the existence of 'at least a 3-level interactive system.' Dept. of Biol., Hood Coll., Frederick, Md. 21701, USA. (mjj)

82:6199 Davis, G.E., 1982. A century of natural change in

coral distribution at the Dry Tortugas: a com- parison of reef maps from 1881 and 1976. Bull. mar. Sci., 32(2):608-623.

A detailed color map of 23,000 hectares produced by Alexander Agassiz was compared with one produced in the mid-1970's by the interdisciplinary Tortugas Reef Atoll Continuing Transect Studies (TRACTS) investigation. The area covered by living hermatypic corals had changed little--from 2.8 to 3.8%--but coral species distribution and reef types showed major changes, some attributed to hurricanes or thermal shock. Includes 2 color maps as loose inserts. Natl. Park Service., Channel Islands Natl. Park, 1699 Anchors Ways Dr., Ventura, Calif. 93003, USA. (mwf)

82:6200 Felbeck, Horst and G.N. Somero, 1982. Primary

production in deep-sea hydrothermai vent organ- isms: roles of sulfide-oxidizing bacteria. Trends biochem. Sci., 7(6):201-204.