000130120 001__ 130120
000130120 005__ 20190405063422.0
000130120 0247_ $$2doi$$a10.1111/j.1365-2699.2009.02094.x
000130120 02470 $$2ISI$$a000268056000012
000130120 037__ $$aARTICLE
000130120 245__ $$aThe curse of taxonomic uncertainty in biogeographical studies of free-living terrestrial protists: a case study of testate amoebae from Amsterdam Island
000130120 269__ $$a2009
000130120 260__ $$c2009
000130120 336__ $$aJournal Articles
000130120 520__ $$aAim A current debate in microbial biogeography contrasts two views concerning the distribution of free-living microorganisms. The first view assumes a ubiquitous distribution, while the second view assumes that at least some species have limited geographical distributions. We tested for limited geographical distributions by identifying testate amoebae morphospecies from an extremely remote oceanic island where the potential for endemism is high. Location Amsterdam Island, Indian Ocean. Methods Sixty moss and water samples collected from the top of the volcano to the lowland were investigated for their testate amoeba content. Due to taxonomical uncertainties among the Argynnia (Nebela) dentistoma species complex (including A. antarctica), we also performed light- and scanning electron microscopy investigations on the shell ultrastructure and biometric analysis on several specimens of this taxon. Results We identified a total of 43 testate amoeba taxa belonging to 15 genera. Only 4 testate amoeba taxa had previously been recorded on this island. Testate amoeba communities of Amsterdam Island are dominated by cosmopolitan ubiquitous euglyphid taxa such as Trinema lineare, Assulina muscorum and Corythion dubium. The length and width ranges for Argynnia dentistoma on Amsterdam Island overlap with other records of this species and of A. antarctica, suggesting that A. antarctica is not a distinct taxon. Main conclusions Although Amsterdam Island is among the most remote islands in the world, an extensive inventory of testate amoebae morphospecies provided no clear evidence for endemism. On the one hand, our detailed morphometic analysis of the Argynnia dentistoma complex revealed that A. antarctica, a morphospecies previously suggested to display endemism, cannot be confidently distinguished from the cosmopolitan morphospecies A. dentistoma. On the other hand, five morphotaxa could not be identified with certainty and might represent new species, potentially with limited distribution. These examples illustrate how taxonomical uncertainties undermine biogeographic studies of testate amoebae. In order to allow better interpretation of morphology-based testate amoeba distribution data, an assessment of genetic diversity among and within morphotaxa in relation to geographic distance for some common testate amoebae should be given high priority.
000130120 6531_ $$aAmsterdam Island
000130120 6531_ $$aBiogeography
000130120 6531_ $$aCosmopolitan distribution
000130120 6531_ $$aEndemism
000130120 6531_ $$aIndian Ocean
000130120 6531_ $$aMicroorganisms
000130120 6531_ $$aTaxonomy
000130120 6531_ $$aTestate amoebae
000130120 700__ $$aHeger, T.J.
000130120 700__ $$aMitchell, E.A.D.
000130120 700__ $$aLedeganck, P.
000130120 700__ $$aVincke, S.
000130120 700__ $$aVan de Vijver, B
000130120 700__ $$aBeyens, L.
000130120 773__ $$tJournal of Biogeography$$j36$$k9$$q1551-1560
000130120 8564_ $$zURL
000130120 8564_ $$uhttps://infoscience.epfl.ch/record/130120/files/Heger_et_al_2009.pdf$$zn/a$$s464967
000130120 909C0 $$xU11021$$0252129$$pECOS
000130120 909CO $$qGLOBAL_SET$$particle$$ooai:infoscience.tind.io:130120$$pENAC
000130120 937__ $$aECOS-ARTICLE-2008-125
000130120 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000130120 980__ $$aARTICLE