468 E. Biological Oceanography, ()LR (1983) 30 (61

Forestry and Environ. Studies, 205 Prospect St., New Haven, Conn. 06511, USA.

83:3454 Pritchard, P.C.H., 1982. Nesting of the leatherback

turtle, Dermochelys coriacea, in Pacific Mexico, with a new estimate of the world population status. Copeia, 4:741-747.

"An aerial survey revealed that nesting by D. coriacea occurs in a greater density and over a much greater extent than previously documented. This single breeding population is by far the largest known. The world population is estimated at 115,000 mature females. Because of severe stresses on all major populations, "endangered" status is still considered justified.' Florida Audubon Sot., l l01 Audubon Way, Maitland, Fla. 32751, USA.

83:3455 Renouf, Deane and M.B. Davis, 1982. Evidence that

seals may use echolocation. Nature, Lond., 300(5893):635-637.

Experimental evidence supports the contention that when visual cues are not available, seals use echolocation. Results help explain why previous attempts to demonstrate sonar abilities in pinnipeds have been unsuccessful. Dept. of Psychology, Me- morial Univ. of Nfld., St. John's, Nfld. AIB 3X9, Canada.

83:3456 Stoneburner, D.L., J.l. Richardson and G.K. Wil-

liamson, 1982. Observations on the movement of hatcbling sea turtles. Copeia, 4:963-965. Custom Telemetry and Consulting, 185 Longview Dr.. Athens, Ga. 30605, USA.

83:3457 Taylor, R.H., 1982. New Zealand fur seals at the

Bounty Islands. N.Z. Jl mar. Freshwat. Res., 16(1):1-9. Ecol. Div., DSIR, Private Bag, Nel- son, New Zealand.

83:3458 Whitledge, T.E., 1982. Regeneration of nitrogen by

the nekton and its significance in the Northwest Africa Upwelling ecosystem. Fishery Bull. nam. mar. Fish. Serv., U.S., 80(2):327-335.

N excretion rates of octopus and fish (6 spp.) ranged 0.44 4.61 ~g NH4-N/mg dry weight per day; whole body C:N was 4.85. N turnover time was ~65 days. Ammonium regeneration rates were ~ 3 mg-at/m-" per day over the shelf and 1.8 mg-at/m: per day on the slope. Dept. of Energy and Environ., Brook- haven Natl. Lab., Upton, NY 11973, USA.

ELI0. Bottom communities

83:3459 Lubchenco, Jane, 1982. Effects of grazers and algal

competitors on fucoid colonization in tide pools. J. Pto,col., 18(4):544-550.

Removal of both herbivores and algal competitors (but not removal of either group alone) from mid-littoral sheltered tide pools resulted in the establishment of Fucus vesiculosus which persisted for up to 3 years. The normal, conspicuous absence of fucoids from these pools must be 'due to the joint action of herbivores and algal competitors and not to possible deleterious factors associated with constant submersion." Dept. of Zool.. Oregon State Univ., Corvallis, Oreg. 97331, USA. (mwf)

83:3460 Munda, I.M. and J.W. Markham, 1982. Seasonal

variations of vegetation patterns and biomass constituents in the rocky eulittoral of Heigoland INorth Seal. Helgolander Meeresunters., 35(2): 131-151. Biol. Inst., Slovene Acad. of Sci. and Arts, Ljubljana, Yugoslavia.

83:3461 van den Hoek, C., 1982. Phytogeographic distribution

groups of henthic marine algae in the North Atlantic Ocean: a review of experimental evi- dence from life history studies. Helgoli~nder Meeresunters., 35(2):153-214.

The possible phytogeographic boundaries of 15 benthic algal species were inferred from "experi- mentally determined lethal temperatures and tem- peratures limiting growth or reproduction.' These boundaries appear to agree with those based on distribution data and often are of a composite nature -e.g., Nemalion helminthoides has a 'southern reproduction boundary on the N. Atlantic E. shore and a southern lethal boundary on the N. Atlantic W. shore.' This 61-page paper details further the distribution of the 15 species and considers causes for NE America's low endemism, Includes 7 pages of references. Dept. of Syst. Bot., Biol. Centre., The Univ., P.O. Box 14, 9750 AA Haren, Groningen, Netherlands. (ahm)

El40. Birds

83:3462 Mel'nikov, Yu.l., 1982. Certain adaptations in coastal

birds. Soy. J. Ecol. (a translation of Ekologiya), 13(2): 134-139.