000057941 001__ 57941
000057941 005__ 20170504092418.0
000057941 0247_ $$2doi$$a10.3140/bull.geosci.1396
000057941 0248_ $$2sideral$$a84175
000057941 037__ $$aART-2013-84175
000057941 041__ $$aeng
000057941 100__ $$0(orcid)0000-0003-1536-3069$$aJiménez-Sánchez, A.
000057941 245__ $$aPalaeogeographical patterns in late Ordovician bryozoan morphology as proxies for temperature
000057941 260__ $$c2013
000057941 5060_ $$aAccess copy available to the general public$$fUnrestricted
000057941 5203_ $$aSeveral studies have revealed temperature-related patterns in recent bryozoans, both in the chemical composition of the skeleton and in the morphological characters of the colonies, but comparable studies on Palaeozoic bryozoans are lacking. In this paper a statistical analysis of the morphological differences is undertaken between congeneric species of some Ordovician bryozoans from warm- and cold-water settings. For this study ten eurythermic cosmopolitan bryozoan genera from the Upper Ordovician were selected from the Mediterranean, Avalonia, Baltic and Laurentia-Siberian provinces. These genera are: Ceramopora and Ceramoporella (Cystoporata); Diplotrypa, Eridotrypa, Hallopora, Heterotrypa, Monticulipora and Trematopora (Trepostomata); Graptodictya (Cryptostomata); and Kukersella (Cyclostomata). The study involved 154 samples belonging to 104 different species. Twenty-eight morphological characters were measured, although only 21 were used in the final statistical analysis. Univariate (t, F, Kolmogorov-Smirnov and Mann-Whitney tests), multivariate discriminant and multivariate ordination (Principal Coordinates, Principal Components, Correspondence, and Detrended Correspondence) analyses were performed on the data. For the univariate and multivariate discriminant analyses, the total set of samples was divided a priori into cold- and warm-water subsets based on palaeolatitude: samples from the Mediterranean province were attributed to the cold-water subset, whereas samples from Avalonia, Baltic and the Laurentian-Siberian provinces were included in the warm-water subset. For the multivariate ordination analysis no a priori grouping by water temperature was imposed, and the aim of these analyses was to test whether different samples were correctly arranged along a water temperature gradient. The univariate statistical analysis showed that there are clear morphological differences between cold- and warm-water species in six of the ten Late Ordovician bryozoan genera analysed in this study, although these differences are only evident for some of the characters used, and only when the analysis is performed on individual genera. The best characters to differentiate species by water temperature are those related to the size of the zooidal polymorphs, especially the diameters of the autozooecia, mesozooecia and exilazooecia. With the exception of one genus (Trematopora), cold-water species have larger zooids. The discriminant analysis was able to classify correctly as warm- or cold-water 100% of the samples for two genera, slightly below 95% for two other genera, and between 67% and 90% for the remaining six genera. Finally, the multivariate ordination analysis was able to separate species by palaeogeographical province in some genera, but these provinces were not correctly arranged along a palaeolatitudinal gradient using any of the methods used.
000057941 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E17$$9info:eu-repo/grantAgreement/ES/MICINN/CGL2009-09583
000057941 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000057941 590__ $$a1.495$$b2013
000057941 591__ $$aPALEONTOLOGY$$b16 / 49 = 0.327$$c2013$$dQ2$$eT1
000057941 591__ $$aGEOSCIENCES, MULTIDISCIPLINARY$$b84 / 174 = 0.483$$c2013$$dQ2$$eT2
000057941 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000057941 700__ $$aTaylor , P.D.
000057941 700__ $$0(orcid)0000-0001-7275-9321$$aGómez, J.B.$$uUniversidad de Zaragoza
000057941 7102_ $$12000$$2685$$aUniversidad de Zaragoza$$bDepartamento de Ciencias de la Tierra$$cPetrología y Geoquímica
000057941 773__ $$g88, 2 (2013), 417-426$$pBULLETIN OF GEOSCIENCES$$tBULLETIN OF GEOSCIENCES$$x1214-1119
000057941 8564_ $$s663796$$uhttp://zaguan.unizar.es/record/57941/files/texto_completo.pdf$$yVersión publicada
000057941 8564_ $$s109927$$uhttp://zaguan.unizar.es/record/57941/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000057941 909CO $$ooai:zaguan.unizar.es:57941$$particulos$$pdriver
000057941 951__ $$a2017-05-04-09:18:44
000057941 980__ $$aARTICLE