Animal-habitat relationships in the Knysna forest : discrimination between forest types by birds and invertebrates

 

Show simple item record

dc.contributor.advisor Crowe, Timothy M en_ZA
dc.contributor.author Koen, Julius Heinrich en_ZA
dc.date.accessioned 2016-05-09T09:02:40Z
dc.date.available 2016-05-09T09:02:40Z
dc.date.issued 1985 en_ZA
dc.identifier.citation Koen, J. 1985. Animal-habitat relationships in the Knysna forest : discrimination between forest types by birds and invertebrates. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/19521
dc.description.abstract Some silvicultural practices in the Knysna Forest are aimed at the sustained-yield production of valuable timber tree species, albeit on limited areas only. This study investigates effects of forest plant species composition and physiognomy on bird and invertebrate communities in three discrete, relatively undisturbed forest types along a dry-wet soil moisture gradient. Using discriminant functions analysis, a 100% floristic and a 78% vegetation structural discrimination was obtained between the three forest types. However, the bird communities of these floristically and structurally different forest types were very similar in species composition and had much lower densities than normally encountered in other superficially similar forests. It was only possible to discriminate between the wet and the moist/dry forest types by using the two best bird discriminators. the blackheaded oriole (Oriolus larvatus) and the sombre bulbul (Andropadus importunus). A separation of the moist and dry forest types was not possible. Although an 81% discrimination between forest types was attained through analysis of ground surface invertebrates. measures of litter and aerial invertebrate abundance were of limited use as discriminators. Historical and biogeographic factors and the low nutritional levels in the soil and vegetation may be the cause of low bird and invertebrate density and diversity. It is concluded therefore, that floristics and vegetation structure have, at best, a minor influence on bird community structure, and possibly also on the invertebrate community in the Knysna Forest and that management practices need not cater for variation in forest vegetation composition and physiognomy. Bibliography: pages 49-59. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Zoology en_ZA
dc.title Animal-habitat relationships in the Knysna forest : discrimination between forest types by birds and invertebrates en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Biological Sciences en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Koen, J. H. (1985). <i>Animal-habitat relationships in the Knysna forest : discrimination between forest types by birds and invertebrates</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/19521 en_ZA
dc.identifier.chicagocitation Koen, Julius Heinrich. <i>"Animal-habitat relationships in the Knysna forest : discrimination between forest types by birds and invertebrates."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1985. http://hdl.handle.net/11427/19521 en_ZA
dc.identifier.vancouvercitation Koen JH. Animal-habitat relationships in the Knysna forest : discrimination between forest types by birds and invertebrates. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1985 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/19521 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Koen, Julius Heinrich AB - Some silvicultural practices in the Knysna Forest are aimed at the sustained-yield production of valuable timber tree species, albeit on limited areas only. This study investigates effects of forest plant species composition and physiognomy on bird and invertebrate communities in three discrete, relatively undisturbed forest types along a dry-wet soil moisture gradient. Using discriminant functions analysis, a 100% floristic and a 78% vegetation structural discrimination was obtained between the three forest types. However, the bird communities of these floristically and structurally different forest types were very similar in species composition and had much lower densities than normally encountered in other superficially similar forests. It was only possible to discriminate between the wet and the moist/dry forest types by using the two best bird discriminators. the blackheaded oriole (Oriolus larvatus) and the sombre bulbul (Andropadus importunus). A separation of the moist and dry forest types was not possible. Although an 81% discrimination between forest types was attained through analysis of ground surface invertebrates. measures of litter and aerial invertebrate abundance were of limited use as discriminators. Historical and biogeographic factors and the low nutritional levels in the soil and vegetation may be the cause of low bird and invertebrate density and diversity. It is concluded therefore, that floristics and vegetation structure have, at best, a minor influence on bird community structure, and possibly also on the invertebrate community in the Knysna Forest and that management practices need not cater for variation in forest vegetation composition and physiognomy. Bibliography: pages 49-59. DA - 1985 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1985 T1 - Animal-habitat relationships in the Knysna forest : discrimination between forest types by birds and invertebrates TI - Animal-habitat relationships in the Knysna forest : discrimination between forest types by birds and invertebrates UR - http://hdl.handle.net/11427/19521 ER - en_ZA


Files in this item

This item appears in the following Collection(s)

Show simple item record