Residues of Polychlorinated Biphenyls (PCB) and Organochlorine Insecticides in Liver Tissue from Terrestrial Danish Predatory Birds

Several observations of the occurrence of PCB in marine organisms have been published since Jensen (1966) proved the presence of these compounds as pollutants in the environment. In the last years the occurrence in terrestrial animals, especially birds have been reported a.o. by Prestt & Moore (1970).     

The standard metabolic rate of dolphin fish

The standard metabolic rates (SMRs) of 11 (1.395–4.125 kg) dolphin fish (mahimahi or dorado, Coryphaena hippurus ) were measured at 25°± 0.5°C. Fish were prevented from swimming with neuromuscular blocking agents and force ventilated. Heart rates were determined simultaneously. SMRs (358–726 mg O₂ h ^–1) were several times those of other similarly sized active teleosts such as salmonids, but close to those of tunas. Heart rates (84–161 beats min ^–1) were also high, but alike those of tunas under similar circumstances. As in tunas, the high SMR of dolphin fish may result from high osmoregulatory costs engendered by their large gill surface areas and/or other adaptations necessary for achieving exceptionally high maximum metabolic rates.     

Bulk chemical characterization of particulate material from the Jade Bay,Lower Saxonian Wadden Sea

Data on the bulk chemical composition (C, N, P, S, total chlorophyll) of particulate matter were obtained on five occasions over one or two tidal cycles in the Jade Bay, Lower Saxonian Wadden Sea. Sampling intervals were usually one hour. The results show pronounced short-term variability for all parameters which is controlled to a large extent by physical processes such as erosion of surficial sediments at high current speeds and sedimentation at slack water. Contributions from living phytoplankton biomass were low while C∶N ratios indicate a high abundance of microheterotrophs. Organic phosphorus accounted for 36% of total P, exchangeable ammonium made up 1.9% of total nitrogen on average.