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  • 1
    Electronic Resource
    Electronic Resource
    Biological aspects of Chew Valley and Blagdon Lakes, England (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 5 (1975), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: This paper forms a sequel to that describing the physical and chemical aspects of Chew Valley and Blagdon Lakes (Wilson et al., 1975).General accounts of the phytoplankton, zooplankton, macrophytes, littoral and benthic faunas, and fish are presented, based on surveys undertaken between 1966 and 1973.The spring diatom blooms (principally Asterionella) are correlated with silica and phosphate depletion in both lakes, while growths of blue-green (principally Microcystis) in the summer and autumn are correlated with low values of nitrate and saline ammonia.The principal zooplankter in both lakes is Daphnia hyalina. Daphnia pulex was found very commonly in Blagdon in 1970/71, but has not been recorded since. The Daphnia in Chew are smaller in size than those in Blagdon.Blagdon is richer in abundance and number of species of littoral animals, and in macrophyte development, than is Chew. The benthos of both lakes is very similar, except that Blagdon has a well-established population of Anodonta cygnaea, while in Chew the species has apparently only recently become established.Both lakes are maintained artificially as trout fisheries. Other fish present include eels, sticklebacks, and gudgeon. Roach and Perch are found in Chew only. An outline account of their food is given based on stomach content analysis, and shows that trout feed principally on chironomid pupae in spring, and on small fish in autumn.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1975.tb01761.x
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  • 2
    Electronic Resource
    Electronic Resource
    Chironomid pupal exuviae in the River Chew (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 7 (1977), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. Weekly skim-net samples of chironomid pupal exuviae were collected at a single station on the River Chew, Avon, England, from September 1972 to September 1973. Eighty-six types of exuviae were characterized in this study, of which sixty-four made up only 4% of the year's catch. Thirty -eight percent of the year's catch was referable to Micropsectra atrofasciata Kieffer.The samples showed the expected maxima of numbers and species in spring and early summer. The emergence periods for many of the more common species were very extended, with one or more peaks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1977.tb01652.x
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  • 3
    Electronic Resource
    Electronic Resource
    The use of chironomid pupal exuviae for characterizing streams (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.tb00923.x
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  • 4
    Electronic Resource
    Electronic Resource
    Physical and chemical aspects of Chew Valley and Blagdon Lakes, two eutrophic reservoirs in North Somerset, England (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 5 (1975), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Chew Valley and Blagdon Lakes are two shallow, hard-water, lowland eutrophic reservoirs, situated near Bristol in the south-west of England.Chew Lake is more turbid and richer in plankton but poorer in macrophytes than Blagdon, and is more exposed to wind action. Both lakes show evidence of transient stratification in the summer coupled to deoxygenation of the bottom water, which has led to release of nutrients from the sediments.Severe algal blooms in Chew Lake in 1968 and the consequent filtration difficulties led to the establishment of a collaborative research programme between the University of Bristol and the Bristol Waterworks Company, to define the present biological status of the lakes, and to predict their possible future development. The work covers a wide range of measurements and observations on the limnological conditions of the lakes, which form an elegantly contrasted pair, and this paper describes their general physical and chemical features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1975.tb01760.x
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  • 5
    Electronic Resource
    Electronic Resource
    Monitoring the Effect of Sewage Effluent on the Oxford Canal Using Chironomid Pupal Exuviae (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 8 (1994), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Collections of chironomid pupal exuviae from the Oxford Canal were taken monthly from May to October 1991 at stations above and below the sewage effluent discharge at Kidlington, near Oxford.The chironomid exuvial assemblages showed clear changes reflecting the effects of the sewage, notably in the increased dominance of Parachironomus arcuatus and Chironomus riparius and other pollution-tolerant species downstream from the effluent inflow. A return to the pattern of taxa seen in the upstream stations was noted below the next canal lock, 2.8 km downstream from the effluent discharge.Environmental quality indices, calculated according to the Chironomid Pupal Exuvial Technique, also reflected the effects of the sewage inflow.The results show that chironomid populations, as sampled by collecting pupal exuviae, are potentially valuable for monitoring organic pollution in canals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.1994.tb00910.x
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  • 6
    Electronic Resource
    Electronic Resource
    The decline of a roach Rutilus rutilus (L.) population in Chew Valley Lake (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 3 (1971), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A series of nettings for roach in Chew Valley Lake carried out by members of the Zoology Department, Bristol University, has revealed a marked decline in the population between 1965 and 1968. Fish from the main Lake were found to be heavily parasitized with Ligula intestinalis (L.) while those from the inflow pool (Herriott's Pool) were practically free from infection. It is considered that the decline of the roach can be linked to the incidence of Ligula, but that clean fish from the inflow pool may provide breeding stock and maintain the production of fry, which serve as food for the trout.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1971.tb03655.x
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  • 7
    Electronic Resource
    Electronic Resource
    Eosinophil Granulocytes and Hypoxia (1967)
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 818-819 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the course of a quantitative study of blood and bone marrow in guinea-pigs exposed to hypoxia, striking changes in the numbers of eosinophil granulocytes were previously found in routine counts2. Results based on the small numbers of eosinophils encountered in routine differential counts of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/213818a0
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  • 8
    Electronic Resource
    Electronic Resource
    The hydraulic interaction between prosoma and opisthosoma in Amaurobius ferox (Chelicerata, Araneae) (1973)
    Springer
    Zoomorphology 74 (1973), S. 221-230 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Experiments are described which demonstrate that blood moves from the prosoma into the opisthosoma in Amaurobius ferox when the spider is held on a plasticine block and is stimulated with a small brush. This movement of blood is also seen during bouts of struggling when the spider is trying to free itself. The return flow of blood from the opisthosoma is to a large extent due to the pumping action of the heart. It is proposed that the locomotory exhaustion shown by artificially stimulated spiders is due to this loss of blood from the prosoma which leads not only to hydraulic insufficiency, but also to a lack of oxygen through interruption of the normal blood flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00375785
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  • 9
    Electronic Resource
    Electronic Resource
    Some comments on the hydrostatic system of spiders (Chelicerata, Araneae) (1970)
    Springer
    Zoomorphology 68 (1970), S. 308-322 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An anatomical study of five spider types has shown that the musculi laterales of the prosoma, together with the subcuticular muscle sheet of the opisthosoma, may be jointly responsible for generating the internal hydrostatic pressures which control the leg extension mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376004
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  • 10
    Electronic Resource
    Electronic Resource
    A survey of the distribution of chironomidae (Diptera, Insecta) of the river rhine by sampling pupal exuviae (1984)
    Springer
    Aquatic ecology 18 (1984), S. 119-132 
    Details
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During the period from 1981-07-23 to 1981-08-10, the River Rhine, from the Alps to the North Sea, was sampled for chironomid pupal exuviae. Samples were also taken from the Grande Canal d'Alsace and from selected tributaries. In all 78 samples were taken, of which 9771 exuviae were examined and 135 taxa identified. A species list is given showing the distribution of taxa between the principal regions of the river (Appendix 1). Samples were also taken to show the ‘within-sample’ and ‘between-sample’ variability, and one pair of samples was used to demonstrate the difference between the two banks of the river below the junction with the Main. The Rhine above the Bodensee has a diverse fauna dominated by Orthocladiinae. The Hochrhein near the entry of the River Aare, and the River Aare itself, also have a diverse fauna, but include many sediment-dwelling Chironominae. Below Strasbourg the fauna changes markedly, losing most of its sediment-dwellers, and shows a great increase of pollution-tolerant species. The fauna generally becomes less diverse and of poorer quality throughout the Oberrhein sections, and faunal changes are demonstrated that are related to the inflow of the Rivers Neckar and Main, Samples from the Mittelrhein gorge and the Niederrhein are generally dominated by two species ofRheotanytarsus and show a progressive reduction of diversity coupled to an increase of pollution-tolerant species. The low proportions of sediment-dwellers in the Niederrhein and the Waal, suggests that the sediments are unsuitable for the support of a normal chironomid fauna.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257051
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