Legendre shape descriptors and shape group determination of specimens in the Cymbella cistula species complex

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dc.contributor.author Pappas, Janice L.
dc.contributor.author Stoermer, Eugene F.
dc.date.accessioned 2011-04-26T15:23:44Z
dc.date.available 2011-04-26T15:23:44Z
dc.date.issued 2003
dc.identifier.uri http://hdl.handle.net/2027.42/83685
dc.description.abstract Ten Legendre shape descriptors were calculated for 66 specimens in the Cymbella cistula species complex from the Great Lakes. One-hundred x,y co-ordinates were used to calculate the width function W(x)=∑b P(x) to obtain the Legendre coefficients (b) as shape descriptors. Principal components analysis (PCA) was performed on Legendre shape descriptors for the whole valve outline, to determine a shape gradient. A second PCA was performed on Legendre shape descriptors for the dorsal side of the valve outline. From this, nine shape groups were determined. From multiple discriminant analysis (DA), all but the third and eigth shape groups had near-perfect specimen assignment. Misassigned specimens from these shape groups were assigned instead to adjacent groups in PCA shape space. Overall, a curved trajectory in PCA shape space may relect the degree of valve shape complexity. That is, there is a progression in PCA shape space form dorsally semicircular and somewhat arcuate to crescentic with a ventrally gibbous midvalve region. The distinct shape groups found indicated that several species may be present in the C. cistula complex. en_US
dc.language.iso en_US en_US
dc.subject Diatoms en_US
dc.subject Morphometric en_US
dc.subject Taxonomy en_US
dc.subject Systematics en_US
dc.title Legendre shape descriptors and shape group determination of specimens in the Cymbella cistula species complex en_US
dc.type Article en_US
dc.subject.hlbsecondlevel Science (General)
dc.subject.hlbsecondlevel Ecology and Evolutionary Biology
dc.subject.hlbtoplevel Science
dc.description.peerreviewed Peer Reviewed en_US
dc.contributor.affiliationum Museum of Paleontology en_US
dc.contributor.affiliationumcampus Ann Arbor en_US
dc.description.bitstreamurl http://deepblue.lib.umich.edu/bitstream/2027.42/83685/1/2003JLPCymbella.pdf
dc.identifier.source Phycologia en_US
dc.owningcollname Zoology, University of Michigan Museum of (UMMZ)
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