Oberholster, Paul JBotha, AMAshton, PJ2010-09-302010-09-302009-04Oberholster, P.J., Botha, A.M. and Ashton, P.J. 2009. Appearance of new taxa: invertebrates, phytoplankton and bacteria in an alkaline, saline, meteorite crater lake, South Africa. Fundamental and Applied Limnology, Vol. 174(3), pp 271-2821863-9135http://www.schweizerbart.de/resources/downloads/paper_previews/73368.pdfhttp://hdl.handle.net/10204/4422Copyright: 2009 E. Schweizerbart’sche Verlagsbuchhandlung. This is the post print version. The definitive version is published in the Fundamental and Applied Limnology, Vol. 174(3), pp 271-282Data generated during 12 field trips in 2006 were used to investigate possible changes in the biota communities of Lake Tswaing after a borehole was sunk in 1988/1989 near the centre of the crater lake. The Tswaing meteorite crater lake is a small (0.07 km2), shallow alkaline (surface water pH varied from 9.6 to 10.3), meromictic lake with a Secchi disk transparency of between 6 and 12 cm. The lake had a distinct surface layer of cyanobacteria (Arthrospira flusiformis), located above a layer of purple sulphur bacteria in the lake. The absence of submerged and emergent aquatic macrophytes in the lake limits habitat diversity for attached diatoms in the littoral regions. Both the numbers of families and the density of the benthic invertebrates were very low. The dominant invertebrate groups present were Nematodes, Muscidae and Hydrophilidae. Seven macroinvertebrate families were recorded, five of which are new to Lake Tswaing. In addition, the periphytic ciliate Blepharisma sp. was also observed for the first time within the land/water contact zone of Lake Tswaing. Benthic diatoms were scarce and the dominant species present was Gyrosigma rautenbachiae, while Nitzschia quadrangula was the dominant planktonic diatom, previously not recorded in the main basin of the lake. The diatom species Nitzschia communis, although in low numbers, was also not reported in previous studies of Lake Tswaing.enBacterial plate distributionBenthic diatomsMacroinvertebratesNodularia spumigenaPhytoplanktonLimnologyBiota communitiesLake TswaingArticleOberholster, P. J., Botha, A., & Ashton, P. (2009). Appearance of new taxa: invertebrates, phytoplankton and bacteria in an alkaline, saline, meteorite crater lake, South Africa. http://hdl.handle.net/10204/4422Oberholster, Paul J, AM Botha, and PJ Ashton "Appearance of new taxa: invertebrates, phytoplankton and bacteria in an alkaline, saline, meteorite crater lake, South Africa." (2009) http://hdl.handle.net/10204/4422Oberholster PJ, Botha A, Ashton P. Appearance of new taxa: invertebrates, phytoplankton and bacteria in an alkaline, saline, meteorite crater lake, South Africa. 2009; http://hdl.handle.net/10204/4422.TY - Article AU - Oberholster, Paul J AU - Botha, AM AU - Ashton, PJ AB - Data generated during 12 field trips in 2006 were used to investigate possible changes in the biota communities of Lake Tswaing after a borehole was sunk in 1988/1989 near the centre of the crater lake. The Tswaing meteorite crater lake is a small (0.07 km2), shallow alkaline (surface water pH varied from 9.6 to 10.3), meromictic lake with a Secchi disk transparency of between 6 and 12 cm. The lake had a distinct surface layer of cyanobacteria (Arthrospira flusiformis), located above a layer of purple sulphur bacteria in the lake. The absence of submerged and emergent aquatic macrophytes in the lake limits habitat diversity for attached diatoms in the littoral regions. Both the numbers of families and the density of the benthic invertebrates were very low. The dominant invertebrate groups present were Nematodes, Muscidae and Hydrophilidae. Seven macroinvertebrate families were recorded, five of which are new to Lake Tswaing. In addition, the periphytic ciliate Blepharisma sp. was also observed for the first time within the land/water contact zone of Lake Tswaing. Benthic diatoms were scarce and the dominant species present was Gyrosigma rautenbachiae, while Nitzschia quadrangula was the dominant planktonic diatom, previously not recorded in the main basin of the lake. The diatom species Nitzschia communis, although in low numbers, was also not reported in previous studies of Lake Tswaing. DA - 2009-04 DB - ResearchSpace DP - CSIR KW - Bacterial plate distribution KW - Benthic diatoms KW - Macroinvertebrates KW - Nodularia spumigena KW - Phytoplankton KW - Limnology KW - Biota communities KW - Lake Tswaing LK - https://researchspace.csir.co.za PY - 2009 SM - 1863-9135 T1 - Appearance of new taxa: invertebrates, phytoplankton and bacteria in an alkaline, saline, meteorite crater lake, South Africa TI - Appearance of new taxa: invertebrates, phytoplankton and bacteria in an alkaline, saline, meteorite crater lake, South Africa UR - http://hdl.handle.net/10204/4422 ER -