By Lars Landner (auth.), Dr. Lars Landner (eds.)
Hazard overview of a compound (xenobiotic) discharged to the aquatic surroundings calls for info on either publicity and results to varied elements of the atmosphere. The multitude of ecological gradients within the Baltic Sea is used as a heritage instance for discussing the complexity of the difficulty and the necessity for brand new methods. hence, this e-book makes an attempt to move past the simplistic, standardized momentary laboratory assessments often used as a foundation for chance evaluation of chemical compounds, and provides robust emphasis to the translation of ecotoxicological info of their actual, ecological context, stating the necessity to ponder the average mortality distribution of the inhabitants less than examine, the position of keystone species and of species with vast ecological niches as opposed to people with slim, really good niches.
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Additional info for Chemicals in the Aquatic Environment: Advanced Hazard Assessment
G Persson (1983). h Elmgren et al. (1984). Schwenke (1974). j In the fourhorn sculpin (Myoxocephalus quadricornis) significant genetic differences were shown in both time and space in the Gulf of Bothnia (Gyllensten and Ryman 1985). However, the degree of genetic differentiation between localities was found to be low and the actual species was thus considered to be suitable for biomonitoring programs. Genetic heterogeneity is also evident in Mytilus edulis when comparing the Baltic proper to the Kattegatt and the North Sea (Theisen 1978).
The transition from a marine Ecosystem Variability and Gradients 29 assemblage in the south and in deeper water layers, where the Arctic zoogeographical element also constitutes a considerable element (Leppakoski 1975 a), to communities more and more dominated by species of freshwater origin in the north and in near-surface waters along the main salinity gradients is well known and logical. In a permanently stratified (halocline) body of water this phenomenon is further strengthened through displacements in the vertical distribution of some species, known as brackish-water submergence of many representatives of the marine element and emergence of species of limnic origin (Remane 1958).
C Approximately 30 macrofaunal taxa identified from the phytal zone at Tvlirminne (W. Gulf of Finland; Hlillfors et al. 1975), and 55 taxa from the Asko area (N. Baltic Proper) (Haage 1975) compared to the approximately 25 taxa in the archipelago of LuleA, N Bothnian Sea (H. Kautsky et al. 1981). d Some introduced species have been added to the original Baltic fauna, especially in some extreme habitats, such as highly disturbed coastal bays, underwater constructions and harbors (Lepplikoski 1984).