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  • 1
    Electronic Resource
    Electronic Resource
    Infrared and Raman studies of nitrate impurity in nitrite complexes (1969)
    s.l. : American Chemical Society
    Inorganic chemistry 8 (1969), S. 219-223 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50072a007
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  • 2
    Electronic Resource
    Electronic Resource
    Inbreeding: Benefits may outweigh costs
    Amsterdam : Elsevier
    Animal Behaviour 34 (1986), S. 939-941 
    Details
    ISSN: 0003-3472
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0003-3472(86)80086-0
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  • 3
    Electronic Resource
    Electronic Resource
    Inbreeding: Benefits may outweigh costs
    Amsterdam : Elsevier
    Animal Behaviour 34 (1986), S. 939-941 
    Details
    ISSN: 0003-3472
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0003-3472(86)80086-0
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of the herbicide paraquat on the ecology of a reservoir (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 3 (1973), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1973.tb00929.x
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  • 5
    Electronic Resource
    Electronic Resource
    A survey of the macro-invertebrate riffle fauna of the River Wye (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 10 (1980), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. Surveys of the Wye catchment in March and September 1975, and July and September 1976 and 1977, yielded 227 macro-invertebrate taxa, 77 of which were Chironomidae. Total macro-invertebrate density ranged from 520 to 22020 m−2. Total density estimates in July 1976. during a period of severe drought, were significantly higher than in July 1977 but no differences were established between estimates on other comparable dates in 1975, 1976 and 1977. The total number of taxa and total macro-invertebrates collected from sites with total dissolved solids concentrations less than 50 mg I−1 were significantly lower than at sites with higher concentrations. In general, upstream sites were dominated numerically by Plecoptera in March; Ephemeroptera, Trichoptera and Diptera were relatively more abundant during the summer months. Sites lower in the catchment were more variable in composition with Oligochaeta, Ephemeroptera, Trichoptera and Diptera all abundant at certain sites and times. The densities of Ecdyonuridae (Ephemeroptera). Hydropsychidae (Trichoptera) and Elminthidae (Coleoptera) in the impounded R. Elan, a tributary of the R. Wye, were significantly lower than at nearby sites on the Wye although no differences in total macro-invertebrate density were established. Average linkage clustering of Spearman rank correlation coefficients between selected taxa allowed the comparison of taxa groups with contemporary site groups by nodal analysis. Six major taxa groups were established and these characterized five site groupings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1980.tb01218.x
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of the herbicide paraquat on the ecology of a reservoir (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 4 (1974), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Toxicity experiments indicated that changes in the fauna following the use of paraquat for weed control were likely to be indirect effects caused by the death and destruction of angiosperms. Generally, invertebrates living amongst the emergent vegetation in the margins of the reservoir and on the sediments were unaffected though the density of the benthic ostracod Cypridopsis vidua increased rapidly after the death of angiosperms. Of the planktonic invertebrates, those which were generally closely associated with the macrophytes were eliminated or survived at lower densities. Many of the invertebrates intimately associated with the angiosperms (e.g. Lepidoptera, Tricho-ptera. Gastropoda) were lost completely or colonized the replacement growth of Chara globularis at reduced densities: these effects were extended to the year after treatment. A few species colonizing Chara were able to establish densities comparable with those found on the angiosperms in the pre-herbicide period but in some cases the time of peak density was delayed.Data from fish gut analyses indicated that there was a change in the diet of the eel following the death of the angiosperms and that this was largely a reflection of the loss, or reduction in density, of many invertebrates associated with the angiosperms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1974.tb00101.x
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  • 7
    Electronic Resource
    Electronic Resource
    The vertical distribution of macro-invertebrates in the substratum of the upper reaches of the River Wye, Wales (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 9 (1979), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. A study of the vertical distribution of benthic macro-invertebrates in the upper Wye, Wales, using basket samplers, indicated no difference between the number of organisms collected, at one sampling time, after 28, 61 and 93 days. However, densities in samples collected after periods greater than 370 days were generally lower than might have been expected. Overall, 59.4%, 22.6% and 18.0% of the benthic invertebrates were recorded in the top (0–11 cm), middle (12–22 cm) and bottom (23–33 cm) levels of the basket samplers. Some organisms were generally confined to the top level (e.g. Ephemeroptera, Simuliidae, Mollusca), others were more evenly distributed (e.g. Oligochaeta, Chironomidae) and some increased with depth at certain times (Sericostoma personatum). Except for organisms confined to the upper layer it was not possible to predict with any certainty the vertical distribution of most organisms within the substratum. The community structure and abundance of invertebrates in the basket samplers differed from collections obtained with a conventional surface sampler.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1979.tb01540.x
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of the herbicide paraquat on the ecology of a reservoir (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 3 (1973), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The application of paraquat (1.0 mg/l) to a fishing reservoir was successful in controlling the angiosperms, Potamogeton pectinatus and Myriophyllum spicatum, but a second application (0.6 mg/l) failed to control a replacement growth of the macro-phytic alga, Chara globularis.Paraquat was quickly lost from the water after each application and was largely taken up by the sediments, never more than 6% ofthe initial dose being recorded from the macrophytes. Final analysis of the sediments indicated that about 36% of the total amount of paraquat applied to the reservoir was not recovered.Some changes in the chemistry ofthe water after the first application of paraquat were consistent with the death of the plants (e.g. alkalinity), but there was no evidence that the subsequent decay ofthe plants produced large increases in the concentrations of major nutrients in the water. Although there was no gross deoxygenation there were changes in the oxygen status of the water following the herbicide-induced death ofthe angiosperms.Estimates of the biomass and net productivity of the macrophytes were made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1973.tb00070.x
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  • 9
    Electronic Resource
    Electronic Resource
    A survey of the macro-invertebrate riffle fauna of the rivers Ystwyth and Rheidol, Wales (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 10 (1980), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. A total of 155 taxa was collected from the Ystwyth (111) and Rheidol (134) catchments and total macro-invertebrate densities ranged from 435 to 9105 m−2 and 155 to 4290 m−2 in the two catchments, respectively. The fauna in each catchment was dominated by Insecta, principally Plecoptera, Ephemeroptera and Diptera. Trichoptera and Oligochaeta were proportionally more abundant in the Rheidol catchment. There was no evidence that the distribution or relative abundance of the faunas of the catchments were related simply to heavy metal contamination (mean zinc concentration up to 2.0 mg I−1 and 0.34 mg I−1 in the Ystwyth and Rheidol, respectively). Average linkage clusters of Spearman rank correlation coefficients suggested that community affinities were probably related principally to location within the catchment. There was no evidence in the Rheidol catchment that irregular discharges (up to c. 15 m3 s−1) of water for hydroelectric purposes had any substantial effect on the invertebrate fauna although total invertebrate density below the discharge was significantly higher than at an upstream site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1980.tb01219.x
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  • 10
    Electronic Resource
    Electronic Resource
    Raman spectra of molten alkali metal carbonates (1972)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 76 (1972), S. 1565-1571 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100655a013
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