+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

On the structure of a population of Oliva oliva (L., 1758) in Papua New Guinea. (Studies on Olividae. 22)

, : On the structure of a population of Oliva oliva (L., 1758) in Papua New Guinea. (Studies on Olividae. 22). Apex (Brussels). 20 septembre; 102-3: 29-38

Monthly samplings of the population of O. oliva on the black sand beach of Sisimangum (Hansa Bay, Papua New Guinea) were effected during 8 months. The very sharp size frequency distribution did not vary appreciably and suggests a high mortality at about half of the maximum size. No significant change was observed in the distribution of shell colour classes. Predation pressure is high: counts of the presence of scars on the shell show that most of the specimens have survived an unsuccessful attack. The distribution of scars suggests that the responsible predator(s) form a "search image" adjusted to the most abundant class of prey (16-20 mm black shells). Such apostatic selection could stabilize the balanced colour polymorphism observed in the population. Abrupt changes in shell colour were experimentally induced by maintaining black specimens on white sand. These induced colour shifts allow an estimation of the growth rate, which averages 4.0 mm/year (for shells in the 13-22 mm range).


Other references

Tomporowski, P.D.; Beasman, K.; Ganio, M.S.; Cureton, K., 2007: Effects of dehydration and fluid ingestion on cognition. The effects of exercise-induced dehydration and fluid ingestion on men's cognitive performance were assessed. Eleven young men attended separate sessions in which each individual cycled in a controlled environment at 60 % of V.O (2max) for pe...

Anonymous, 2002: Occupational exposures to air contaminants at the World Trade Center disaster site--New York, September-October, 2001. Amid concerns about the fires and suspected presence of toxic materials in the rubble pile following the collapse of the World Trade Center (WTC) buildings on September 11, 2001, the New York City Department of Health (NYCDOH) asked CDC for assist...

Diamant-Berger, L., 1952: Post-traumatic osteoporosis. Bulletin Medical 66(17): 353-356

Lagan, M., 1961: Regeneration from implanted dissociated cells II Regenerates produced by dissociated cells derived from different organs. In adult axolotls, hind limbs were irradiated (3000-5000 r) to destroy the regeneration ability. Three to 6 weeks afterwards the limbs were injected with mixtures of cell suspensions from various body parts (tail and limb, their blastemas, head, o...

Hunt P.A.; Giblin A.M., 1984: Iron mobility and the geochemistry of groundwaters in the Hawkesbury Sandstone of the Sydney Basin. Abstracts Geological Society of Australia: ages 268-270. 1984.

Reznicek, L.; Lamparter, J.; Vogel, M.; Kampik, A.; Hirneiß, C., 2016: Flicker defined form perimetry in glaucoma suspects with normal achromatic visual fields. To evaluate if repeated flicker-defined form (FDF) perimetry can detect visual field (VF) defects in glaucoma suspects with normal findings in achromatic standard automated perimetry (SAP). Patients with optic nerve heads (ONHs) or retinal nerve f...

Evdonin, A.L.; Tsupkina, N.V.; Konstantinova, I.M.; Medvedeva, N.D., 1999: Intracellular distribution of proteasomes in A-431 cells. The intracellular proteasome distribution in A-431 cells was shown using methods of cell fractionation and immunofluorescence. In growing cells the distribution of proteasomes was EGF-dependent. In unstimulated cells and within 30 min of EGF treat...

Hermans, E.H., 1957: Dermabrasion technique with diamond fraises. A.M.A. Archives of Dermatology 75(6): 871-872

Roos, J.; Jorgensen, C.B., 1974: Rates of disappearance from blood and biological potencies of mammalian gonadotropins (HCG and ovine LH) in the toad Bufo bufo bufo (L.). General and Comparative Endocrinology 23(4): 432-437

Kravchenko, A.; Citerne, S.; Jéhanno, I.; Bersimbaev, R.I.; Veit, B.; Meyer, C.; Leprince, A-Sophie., 2016: Mutations in the Arabidopsis Lst8 and Raptor genes encoding partners of the TOR complex, or inhibition of TOR activity decrease abscisic acid (ABA) synthesis. The Target of Rapamycin (TOR) kinase regulates essential processes in plant growth and development by modulation of metabolism and translation in response to environmental signals. In this study, we show that abscisic acid (ABA) metabolism is also...