Relation between tolerances and distribution of two species of Ephemeroptera

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dc.contributor.advisorBrown, Alec Cen_ZA
dc.contributor.authorNoble, Robert Grahamen_ZA
dc.date.accessioned2016-03-10T06:56:34Z
dc.date.available2016-03-10T06:56:34Z
dc.date.issued1970en_ZA
dc.descriptionIncludes bibliographical references (p. 463-490).en_ZA
dc.description.abstractIn this study, tolerance limits for a number of environmental factors, taken both singly and in combination, have been determined in the laboratory for aquatic nymphs of two mayflies, Baetis harrisoni Barnard 1932 and Choroterpes (Euthraulus) bugandensis (Kimmins 1956). These limits have been examined in the light of available information on the ecology of the nymphs, in order to see to what extent the distribution of each species might be limited by intolerable environmental conditions. Baetis nymphs were found to be dislodged from rocks in the stream flow by current speeds in excess of 0.5-0.6 m/sec actually impinging on the nymphs and estimated 0.1 cm from the substratum surface. Choroterpes nymphs were dislodged by current speeds in excess of 0.3-0.4 m/sec estimated 0.1 cm from the substratum surface. Possible effects of flooding on nymphal populations of each species have been discussed in relation to the behaviour and physical habitat of the nymphs. Baetis nymphs live on rocks exposed to the current and numbers of them are washed away even in moderate floods. Choroterpes nymphs live on the under surfaces of rocks and numbers of them are only washed away by floods sufficiently strong to roll these rocks.en_ZA
dc.identifier.apacitationNoble, R. G. (1970). <i>Relation between tolerances and distribution of two species of Ephemeroptera</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/17621en_ZA
dc.identifier.chicagocitationNoble, Robert Graham. <i>"Relation between tolerances and distribution of two species of Ephemeroptera."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1970. http://hdl.handle.net/11427/17621en_ZA
dc.identifier.citationNoble, R. 1970. Relation between tolerances and distribution of two species of Ephemeroptera. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Noble, Robert Graham AB - In this study, tolerance limits for a number of environmental factors, taken both singly and in combination, have been determined in the laboratory for aquatic nymphs of two mayflies, Baetis harrisoni Barnard 1932 and Choroterpes (Euthraulus) bugandensis (Kimmins 1956). These limits have been examined in the light of available information on the ecology of the nymphs, in order to see to what extent the distribution of each species might be limited by intolerable environmental conditions. Baetis nymphs were found to be dislodged from rocks in the stream flow by current speeds in excess of 0.5-0.6 m/sec actually impinging on the nymphs and estimated 0.1 cm from the substratum surface. Choroterpes nymphs were dislodged by current speeds in excess of 0.3-0.4 m/sec estimated 0.1 cm from the substratum surface. Possible effects of flooding on nymphal populations of each species have been discussed in relation to the behaviour and physical habitat of the nymphs. Baetis nymphs live on rocks exposed to the current and numbers of them are washed away even in moderate floods. Choroterpes nymphs live on the under surfaces of rocks and numbers of them are only washed away by floods sufficiently strong to roll these rocks. DA - 1970 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1970 T1 - Relation between tolerances and distribution of two species of Ephemeroptera TI - Relation between tolerances and distribution of two species of Ephemeroptera UR - http://hdl.handle.net/11427/17621 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17621
dc.identifier.vancouvercitationNoble RG. Relation between tolerances and distribution of two species of Ephemeroptera. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1970 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17621en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Biological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherZoologyen_ZA
dc.titleRelation between tolerances and distribution of two species of Ephemeropteraen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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