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排序方式: 共有189条查询结果,搜索用时 6 毫秒
91.
Rainer Brüggemann Andreas Kaune Laszlo Zelles Anton Hartmann Christian Steinberg 《Environmental Sciences Europe》1995,7(5):265-274
Ecotoxicological investigations focus on biological systems and their response to chemically induced stress. Experimental techniques are much more developed than deterministic dynamic modelling. In this methodological contribution a technique is presented, based on lattice theory. This technique, also calledHasse diagram technique, allows data analysis with respect to comparative evaluation. Hasse diagrams are used ? to suggest a possible measure of microbial diversity, ? to analyze dependencies between phospholipid fatty acids and simple geochemical parameters on an ordinal scale and ? to visualise complex results of interactions of humic substances with xenobiotics. 相似文献
92.
Niklas Johansson Gran Milbrink 《Journal of the American Water Resources Association》1976,12(1):39-48
ABSTRACT. Fertilized eggs of perch (Perca fluviatilus L.) and roach (Rutilus rutilus L.) were reared at different pH values both in the field and in the laboratory. The results from the laboratory tests revealed that both species showed at least a 50% decrease in their hatching frequencies when reared at pH values below 5.6. At pH values below 4.6 both species studied show an almost complete lack of reproduction. The field studies with eggs from different lakes indicated that there might be an adaptation, manifesting itself as a higher frequency of hatching in water with a composition similar to that of the natural habitat. Field experiments also showed that the roach is more sensitive than perch to low pH values. 相似文献
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The Science of Nature - 相似文献
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André V. L. Freitas José Roberto Trigo Keith S. Brown Jr. Ludger Witte Thomas Hartmann Lauro E. S. Barata 《Chemoecology》1996,7(2):61-67
Summary Larvae of the ithomiine butterflyPlacidula euryanassa sequester tropane alkaloids (TAs) from the host plantBrugmansia suaveolens and pass them through the pupae to freshly emerged adults. Wild caught adults also show in their tissues, variable amounts of pyrrolidizine alkaloids (PAs), probably sequestered from variable plant sources and subject to dynamics of incorporation, accumulation and utilization of PAs by ithomiine butterflies. The ratio TAs/PAs is also variable between different populations.Miraleria cymothoe, another ithomiine that feeds onB. suaveolens as larvae, does not sequester TAs from the host-plant, but sequesters PAs from plant sources visited by the adult butterflies. The main alkaloid found in both butterflies is lycopsamine, which also is the principal PA found in all genera of Ithomiinae. 相似文献
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