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44 results for “Formica rufa group”
Fig. 30 in A taxonomic revision of the Palaearctic members of the Formica rufa group (Hymenoptera: Formicidae) - the famous mound-building red wood ants
Fig. 30: Principal component analysis of 10 nest samples of Formica kupyanskayae (white rhombs) and of 76 nest samples of Formica pratensis (black dots). Ten phenotypic characters were considered.
Fig. 29 in A taxonomic revision of the Palaearctic members of the Formica rufa group (Hymenoptera: Formicidae) - the famous mound-building red wood ants
Fig. 29: Principal component analysis of polymorphism in 295 gynes of Formica pratensis. The P-morph with reduced setae (white dots) is clearly separated from the strongly haired N-morph (black rhombs). Eleven phenotypic characters were considered.
Fig. 24 in A taxonomic revision of the Palaearctic members of the Formica rufa group (Hymenoptera: Formicidae) - the famous mound-building red wood ants
Fig. 24: Position of the type samples of Formica major NY- LANDER, 1849 (MA) and Formica constricta KARAVAJEV, 1929 (CO) in a principal component analysis considering 58 nest samples of Formica polyctena (black squares) and 27 nest samples of Formica aquilonia × polyctena or backcrosses (white dots). The F. polyctena sample deeply placed within the hybrid cluster is aberrant and cannot be a hybrid for zoogeographical reasons. Seven phenotypic characters were considered.
Fig.22 in A taxonomic revision of the Palaearctic members of the Formica rufa group (Hymenoptera: Formicidae) - the famous mound-building red wood ants
Fig.22: Classification by the exploratory data analyses NC-Ward (dendrogram shown), NC-part.hclust and NC-part.kmeans and final species hypothesis formed by a controlling linear discriminant function (for details, see Material and Methods). Shown are 169 samples of workers of Formica rufa (red bars), Formica polyctena × rufa and backcrosses (green bars), and F. polyctena (black bars). White bars indicate outliers in NC- part.clust. The mean error of three analyses is 3.7% for K = 2 (presence of hybrids ignored) but 13.2% for K = 3 (presence of hybrids accepted), with 19% of the hybrid samples classified as either parental species. Accordingly, a hypothesis forma- tion based on NC-clustering alone, neglecting any accessory information, would suggest two sufficiently separable species. Twelve phenotypic characters were considered.
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