摘要:

Mitochondrial DNA (mt‐DNA) of three eel species (the Atlantic eelsAnguilla anguillaandA. rostrata, and the African eelA. mossam‐bica), was sequenced and compared with mt‐DNA of other Indo‐Pacific eels(A. japonicaandA. marmorata, obtained from the EM‐BL data library), with the aim of analysing their phylogenetic relationships. Maximum parsimony analysis of 475 bp alignable sequences (partial Cyt‐b, tRNAThrand tRNAPro) showed a single most parsimonious tree, which was in agreement with the phylogeny ex pected on the basis of their breeding grounds distribution. UPGMA analysis resulted in a similar tree. Pairwise comparison of the se quences confirmed te genetic separation of the Atlantic species and showed a small evolutive distance between them. Nucleotide diver sities between Indo‐Pacific species equaled the diversities between these and the two grouped Atlantic species, suggesting that the three Indo‐Pacific species could have had an evolutive origin almost con temporary with a common ancestor of the Atlantic eels. A further 922 bp alignable mt‐DNA sequences (partial D‐Loop, tRNApheand 12srDNA)of A. rostrata, A. anguillaand Amossambicaconfirmed the phylogenetic relationships among the three species, but showed a slower mutation rate compared with the previous sequences, point ing to a non‐random distribution of variable sites along the mitochondrial genome. The possible geological events responsible for eel speciation are discussed.

ISSN:1125-0003    

DOI:10.1080/11250009609356144

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Geographic variation of the European moleTalpa europaeawas investigated through univariate and multivariate analyses of mor phometric characters. Fifteen Cartesian coordinates were recorded from the left mandible of 466 specimens from 145 European localities. Sexes and sample localities were pooled after testing for homogeneity of groups. Data were transformed to avoid the effect of within‐group allometry. Four major phenetic clusters are evident, i.e., a French‐Spanish, a central European, an Italian, and a British one. Distribution of specimens in canonical space is related to both geography and climate. The influence of historical events on variation was tested through the analyses of hypothetical secondary contact zones, showing the occurrence of stepclines. These step‐clines may be related to range expansion following ice retreat after the last Pleistocene glaciation.

ISSN:1125-0003    

DOI:10.1080/11250009609356145

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Populations ofFelis silvestris, the European, Asian and African wildcats, and the domestic cat, are characterized by a variable, genetically controlled, coat‐colour and markings system. Samples of the three Italian cats, the European, the Sardinian (belonging to the African group) and the domestic striped tabby were studied for com position and occurrence of coat‐colour and markings patterns, as well as for their association with craniometric and splanchnometric categories. Intergroup differences in the coat‐colour and markings system were consistent with known metric differences. It was thus possible to distinguish, objectively, the three cats from each other by means of coat patterns, even more clearly than with metric procedures. Distances between taxa, calculated through the relative frequencies of the coat patterns, were fully consistent with those measured from allele frequencies for polymorphic loci. This confirm ed the polytypical species status ofFelis silvestris.

ISSN:1125-0003    

DOI:10.1080/11250009609356146

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:1125-0003    

DOI:10.1080/11250009609356147

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:1125-0003    

DOI:10.1080/11250009609356133

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor