Bionomical research on the continental shelf of Oran‘s Gulf enabled us to study Annelida macrofauna. Sampling sites were selected according bathymetry, which was divided into eight transects. Collected samples with Aberdeen grab separated Polychaeta Annelids from other zoological groups. 1571 inventoried and determined by species, including ten orders (Amphinomida, Capitellida, Eunicida, Flabel...

Blue jays (Cyanocitta cristata) were trained to hunt for non-cryptic moths presented in projected images. On each trial, the jays chose one of two patches to hunt in: (1) a uniform, “non-depleting” patch with constant prey density of 0.25; or (2) a “depleting” patch in which prey density changed during the foraging bout. In the depleting patch, the initial prey density was 0.50, declining to ze...

This review critically evaluates the available mercury (Hg) data in Arctic marine biota and the Inuit population against toxicity threshold values. In particular marine top predators exhibit concentrations of mercury in their tissues and organs that are believed to exceed thresholds for biological effects. Species whose concentrations exceed threshold values include the polar bears (Ursus marit...

The polypeptide chain composition and the chemical properties of several annelid hemoglobins and chlorocruorins are presented. In agreement with earlier studies on the hemoglobin from Arenicola cristata (Waxman, L. (1971) J. Biol. Chem. 246, 7318-7327), nearly all of the pigments which have been examined consist of one or more different disulfide-linked polypeptide chains of 13,000 to 16,000 da...

Japanese species of the genus Netelia of the subgenus Bessobates are revised. Fourteen species are recognized. Four new species, N. (B.) longipad, N. (B.) nigridorsalis, N. (B.) nodai and N. (B.) yakushimensis, are described. Six species, N. (B.) comitor Tolkanitz, 1974, N. (B.) frenata Tolkanitz, 1981, N. (B.) gansuana (Kokujev, 1906), N. (B.) kiuhabona (Uchida, 1928), N. (B.) nanaki Kaur & Jo...