Protists from extreme habitats exemplified by choanoflagellates from the Atacama Desert
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| Title: | Main Title: Protists from extreme habitats exemplified by choanoflagellates from the Atacama Desert |
| Description: | Abstract: Heterotrophic protists are of great importance for aquatic food webs and directly influence the availability of carbon to higher trophic levels. Due to their high abundances, high contribution to the total biomass and their distribution even in habitats with extreme environmental conditions, protists are central to ecological studies of habitats worldwide. The high pace of evolution in protists also makes them ideal models for evolutionary mechanisms. As the sister group of Metazoa choanoflagellates are of additional interest regarding the evolution of multicellular life. Choanoflagellates are heterotrophic protists that filter-feed on bacteria with high efficiency. Their taxonomy recently has been under revision due to combination of new data obtained from higher level molecular and morphological analyses. Studying choanoflagellate phylogeny and their mechanisms of adaption to extreme habitats will lead to new insights regarding the molecular mechanisms underlying ecological adaptations. The Atacama Desert, with hyper arid conditions stable for millions of years, is providing a variety of different extreme habitats. With its unique conditions, the Atacama Desert acts as an adaptation centre for protist speciation. Fostering hypersaline conditions, high UV-radiation and unique mineral compositions, salt flats are environments that require unique and drastic adaptations for organisms inhabiting them. This thesis focused on the investigation of different choanoflagellate species from habitats with extreme conditions. Several habitats of the Atacama Desert were sampled and screened for choanoflagellates, which were isolated, cultivated and investigated via light and electron microscopy, molecular analysis and autecological experiments. A new species of craspedid choanoflagellates, isolated from Salar de Llamara and highly adapted to hypersaline environments, is described to further elucidate evolutionary processes of choanoflagellate species from the Atacama Desert. Additionally, a survey of the global distribution of the newly erected genus Enibas is conducted by screening of south England coastal waters. Overall this study expands the knowledge on choanoflagellate phylogeny and the effects of isolation in extreme habitats on the pace of evolution and speciation. |
Responsible Party
| Creator: | Lennart Gutsche (Author) |
| Publisher: | CRC1211 Database (CRC1211DB) |
| Publication Year: | 2019 |
Topic
| CRC1211 Topic: | Biology |
| Related Subproject: | B3 |
| Subject: | Keyword: Biogeography |
| Geogr. Information Topic: | Biota |
File Details
| Filename: | GutscheBA.pdf |
| Data Type: | Text - Text |
| File Size: | 712 KB |
| Date: | Available: 03.07.2019 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Only Own Subproject |
| General Access and Use Conditions: | According to the CRC1211DB data policy agreement. |
| Access Limitations: | According to the CRC1211DB data policy agreement. |
| Licence: | None |
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Specific Information - Report
| Report Date: | 3rd of July, 2019 |
| Report Type: | Bachelor Thesis |
| Report City: | Cologne |
| Report Institution: | University of Cologne |
Metadata Details
| Metadata Creator: | Frank Nitsche |
| Metadata Created: | 24.10.2019 |
| Metadata Last Updated: | 24.10.2019 |
| Subproject: | B3 |
| Funding Phase: | 1 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 63 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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