Analysis of evolutionary processes within the placidid stramenopile flagellates

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Title:Main Title: Analysis of evolutionary processes within the placidid stramenopile flagellates
Description:Abstract: Evolution!at!the!basis!of!the!tree!of!life!has!long!been!and!is!still!fascinating!scientists.! Reconstructing!the!phylogenetic!tree!that!unites!all!lineages!of!eukaryotes!is!still!a!grand! challenge.! The! difficulty! to! define! homologous! characters! across! the! very! different! lineages! makes! it! extremely! difficult! to! resolve! evolutionary! processes.! The! incompleteness! of! consistent! paleontological! records! of! the! delicate! single! cell! organisms!at!the!basis!of!the!tree!of!life!makes! calibration!of!evolutionary!time! scales! imprecise.!To!get!more!insights!into!evolutionary!processes!of!heterotrophic!flagellates,! we!use!Placididea.!This!recently!discovered!class!within!the!stramenopile!flagellates!has! been!isolated!from!nearly!all!continents,!originating!from!locally!separated!and!extreme! conditions,!as!well!as!coastal!regions.!Placidids!are!potentially!fast!evolving!organisms! due!to!their!small!size!and!their!adaptability!to!live!at!isolated!and!extreme!conditions.! The!first!described!species!was!Wobblia'lunata!Moriya!et'al.,!2000!obtained!from!marine! coastal!waters!of!Japan.!Two!years!later,!they!discovered!an!additional!species!in!Japan,! Placidia' cafeteriopsis.! Until! the! recent! discovery! of! Suigetsumonas' clinomigrationis! Okamura! and! Kondo,! 2015,! no! further! Placididea! were! described! and! only! partial! sequences! of! 18S! rDNA! of! strains! from! Canada,! Poland,! South! Africa,! Kenya! and! the! English!Channel!have!been!published.!We!succeeded!in!isolating!nine!novel!strains!from! Chile,!two!from!Germany,!one!from!the!Galápagos!Islands!and!Kenya.!14!placidids!have! been! used! for! multigene! analysis! to! obtain! information! about! the! mutation! rates! of! geographically!very!distant!organisms.!The!investigation!of!multiple!genes!increase!the! possibility! for! the! differentiation! between! species! and! populations! and! for! a! higher! robustness! of! the! phylogenetic! tree.! We! contribute! first! insights! into! evolutionary! processes,! mutation! rates,! and! the! molecular! clock! within! the! class! of! Placididea! combining!morphologicald,!ecologicald!and!phylogenetical!approaches.!
Responsible Party
Creator:Alexandra Rybarski (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:RybarskiMA.pdf
Data Type:Text - Text
File Size:565 KB
Date:Available: 24.05.2017
Mime Type:application/pdf
Data Format:PDF
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:24th of May, 2017
Report Type:Master 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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