Learn More
Variations in total brain mass and in the mass of three brain regions (main olfactory bulb, hippocampus, auditory nuclei) were examined using a data set for 63 species of bats (Chiroptera). Using both conventional and phylogenetically based analysis of covariance (log body mass as covariate), we tested several hypotheses that relate total brain mass or the(More)
We carried out DNA-hybridization comparisons among representatives of the major groups of Chiroptera to determine the phylogenetic position of the New Zealand short-tailed bat, Mystacina tuberculata. All analyses confirmed the noctilionoid affinity of this species suggested by an earlier serological study, with support from taxon jackknifing and at(More)
We examined taxa from 13 of the 17 chiropteran families, using single-copy DNA hybridization. Five taxa that either represented points of controversy in systematics or were members of problematic families were included in the experiment. The resulting data were used to build phylogenetic trees of 14 and 19 taxa, and by combining this study's data with those(More)
A complete suite of comparisons among six bandicoot species and one outgroup marsupial was generated using the hydroxyapatite chromatography method of DNA/DNA hybridization; heterologous comparisons were also made with three other bandicoot taxa. Matrices of ΔTm's, Δmodes, and ΔT50Hs were generated and corrected for nonreciprocity, homoplasy, and, in the(More)
We report three sets of DNA hybridization experiments conducted to determine relationships among species ofDidelphis (D. albiventris, D. marsupialis, D. virginiana). The 1989 and 1991 sets had fewer replicates per cell than the 1990 series (3.4 and 5.4 vs 9), but in 1991 we distinguished two populations ofD. marsupialis and utilized several individuals for(More)
Single-copy DNA/DNA hybridization experiments and numerical cladistic analyses of anatomical characters were used to investigate relationships among nine phalangerid (Marsupialia) species from four different genera. Both rate-dependent and rate-independent analyses of molecular data indicate that species ofTrichosurus form one clade and thatStrigocuscus,(More)
Lapointe and Kirsch (1995) have recently explored the possibility of reconstructing phylogenetic trees from lacunose distance matrices. They have shown that missing cells can be estimated using the ultrametric property of distances, and that reliable trees can be derived from such filled matrices. Here, we extend their work by introducing a novel way to(More)
We used tissues of the Virginia opossum (Didelphis virginiana) to examine the experimental accuracy of DNA hybridization statistics of thermal stability (Tmode, Tm, T50H, and NPH) with respect to systematic biases in counting radioactivity in elution fractions, and column position and loading order of hybrids in the thermal elution device. We failed to(More)
Part of the mitochondrial 12S ribosomal RNA gene was amplified and sequenced for 26 marsupials. Multiple alignments for these sequences as well as seven additional sequences taken from GenBank were obtained using CLUSTAL. PAUP was used for phylogenetic analysis and to obtain random tree-length distributions. Analyses were performed with and without(More)