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Die sperm-ultrastruktuur van drie echinodermaatspesies en die invloed van lindaan op die ultrastruktuur van die Parechinus angulosus--sperm
Tesis (M. Sc.) -- Universiteit van Stellenbosch, 1997.
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| Format: | Thesis |
| Language: | Afrikaans |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613738297720832 |
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| access_status_str | Open Access |
| author | Du Toit, Antonie Louis |
| author2 | Reinecke, A. J. |
| author_browse | Du Toit, Antonie Louis Reinecke, A. J. |
| author_facet | Reinecke, A. J. Du Toit, Antonie Louis |
| author_sort | Du Toit, Antonie Louis |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Tesis (M. Sc.) -- Universiteit van Stellenbosch, 1997. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/55508 |
| institution | Stellenbosch University (South Africa) |
| language | Afrikaans |
| last_indexed | 2026-06-10T12:40:54.953Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/55508 Die sperm-ultrastruktuur van drie echinodermaatspesies en die invloed van lindaan op die ultrastruktuur van die Parechinus angulosus--sperm Du Toit, Antonie Louis Reinecke, A. J. Stellenbosch University. Faculty of Science. Dept. of Botany & Zoology. Spermatozoa Echinodermata -- Spermatozoa Lindane Dissertations -- Zoology Tesis (M. Sc.) -- Universiteit van Stellenbosch, 1997. TEM studies of the sperm ultrastructure of three South African echinoderms (Parechinus angulosus (Leske, 1778): Echinoidea; Ophiarachnella capensis (Bell, 1888): Ophiuroidea; Patiriella exigua (Lamarck, 1816): Asteroidea) were performed. All three species have a sperm morphology of the primitive type consisting of spherical (O. capensis and P. exigua) or conical (P. angulosus) headpieces, a midpiece and a long flagellated tail. The shape of the apical granules varies from the semi-spherical for P. angulosus, to flattened ovale for O. capensis to spherical for P. exigua. These are enclosed in an acrosomal membrane and are respectively embedded in cup shaped, undulating and funnel shaped nuclear fossa. The posterior contingent of the peri-acrosomal material of the echinoid and asteroid sperm is differentiated as a sub-acrosomal component, while it appears homogeneous in the ophiuroid sperm. Nuclear vacuoles are found in the electron dense and granular nuclei of the non-echinoid sperm, but seem to be absent from Parechinus sperm. The latter contain a deep posterior nuclear fossa that is less prominent in Ophiarachnella sperm and absent from Patiriella sperm. A single, annular mitochondrion encircles the sperm flagellum of P. angulosus and O. capensis symmetrically and that of P. exigua asymmetrically. Two centrioles (distal and proximal) are associated with the flagella of each of the three species. Using suitable micrographs, the typical 9+2 configurations of microtubuli and accessory structures of flagella are described. The angle at which the flagellum of P. angulosus and O. capensis joins the headpiece is perpendicular to the nuclear basis and less than 90° in the P. exigua sperm. In all three species the sperm cell is totally enclosed by a plasma membrane except where it fuses with the apical membrane to form the compound membrane. In order to show phylogenetic and taxonomic similarities and differences, sperm ultrastructure was compared amongst the three species and with other species of the same classes. In the second part of this study, the influence of lindane on the sperm ultrastructure of P. angulosus was investigated. Appreciable damage to the membrane and nuclear material of the sperm of study animals, exposed to 500 µg/l lindane, was observed and described. These findings support evidence that sperm morphology could possibly be used as a biomarker of environmental quality. Masters 2012-08-27T11:37:05Z 2012-08-27T11:37:05Z 1997 Thesis http://hdl.handle.net/10019.1/55508 af Stellenbosch University 146 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Spermatozoa Echinodermata -- Spermatozoa Lindane Dissertations -- Zoology Du Toit, Antonie Louis Die sperm-ultrastruktuur van drie echinodermaatspesies en die invloed van lindaan op die ultrastruktuur van die Parechinus angulosus--sperm |
| title | Die sperm-ultrastruktuur van drie echinodermaatspesies en die invloed van lindaan op die ultrastruktuur van die Parechinus angulosus--sperm |
| title_full | Die sperm-ultrastruktuur van drie echinodermaatspesies en die invloed van lindaan op die ultrastruktuur van die Parechinus angulosus--sperm |
| title_fullStr | Die sperm-ultrastruktuur van drie echinodermaatspesies en die invloed van lindaan op die ultrastruktuur van die Parechinus angulosus--sperm |
| title_full_unstemmed | Die sperm-ultrastruktuur van drie echinodermaatspesies en die invloed van lindaan op die ultrastruktuur van die Parechinus angulosus--sperm |
| title_short | Die sperm-ultrastruktuur van drie echinodermaatspesies en die invloed van lindaan op die ultrastruktuur van die Parechinus angulosus--sperm |
| title_sort | die sperm ultrastruktuur van drie echinodermaatspesies en die invloed van lindaan op die ultrastruktuur van die parechinus angulosus sperm |
| topic | Spermatozoa Echinodermata -- Spermatozoa Lindane Dissertations -- Zoology |
| url | http://hdl.handle.net/10019.1/55508 |
| work_keys_str_mv | AT dutoitantonielouis diespermultrastruktuurvandrieechinodermaatspesiesendieinvloedvanlindaanopdieultrastruktuurvandieparechinusangulosussperm |