Page 1 - CrociduraWagler_Sara
P. 1

Boll. Zool. 57: 283-293 (1990)

                                                        Insular variation in central                                           INTRODUCTION

                                                        Mediterranean Crocidura Wagler, 1832 The taxonomy of the genus Crocidura in continental
                                                        (Mammalia, Soricidae)
                                                                                                                               and Mediterranean insular populations has long been a

                                                                                                                               controversial matter. However, the recent development

                                                                                                                               of karyological and biochemical techniques has con-

                                                                                                                               firmed the specific status of the shrews living on Corsi-

                                                        MAURIZIO SARA                                                          ca (Catalan & Poitevin, 1981), Sardinia (Catzeflis,
                                                        MARIO LO VALVO                                                         1983a), Cyprus (Catzeflis, 1983b), Minorca and Ibiza
                                                        LAURA ZANCA                                                            (Poitevin et al., 1986) and Crete (Vogel et al., 1986).
                                                                                                                               The taxonomy of Sicilian shrews was also quite con-
                                                        Istituto di Zoologia, Università di Palermo,                           fused and both the number of species living in this
                                                        via Archirafi, 18 - I-90123 Palermo (Italy)                            Mediterranean island and their taxonomic status were

                                                                                                                               matters of discussion (see Vogel, 1988, and Contoli et

                                                                                                                               al., 1989, for a review). Uncertain was also the taxo-

                                                                                                                               nomy of shrews on Malta and Gozo (Schembri &

                                                                                                                               Schembri, 1979) and Pantelleria. Description of the

Downloaded by [] at 10:10 22 March 2014                                                                         species on this latter island relies on a single specimen

                                                                                                                               similar to C. cf. russula (Contoli & Amori, 1986). Con-

                                                                                                                               cerning the taxon living on the Egadi archipelago,

                                                        ABSTRACT                                                               authors have generally agreed on the presence of C.
                                                                                                                               suaveolens (Krapp, 1969; Vesmanis, 1976).

                                                           Morphometric variation of Crocidura mandible in Sicily and sur-       During a survey (1987-88) of the trophic niche of
                                                        rounding islands (Egadi archipelago, Ustica, Pantelleria and Gozo)     Tjto alba a large sample of Crocidura bony fragments
                                                        was analyzed by principal component and canonical variate ana-
                                                        lyses in order to integrate recent chromosomal and biochemical was found on Pantelleria. A few specimens were also

                                                        observations. Specimens of C. suaveolens and C. leucodon from main- found on the Egadi islands and on Ustica. It was also
                                                        land Italy and of C. russula from Sardinia were used as reference in
                                                        this analysis. The biometry of the only taxon of shrews living in      possible, moreover, to examine some mandible frag-
                                                        Sicily is significantly different from the three reference samples.    ments (coming from a Holocene layer) recently found
                                                        This result, coupled with a recently discovered new karyotype,         on Lampedusa. The presence of the taxon on Ustica

                                                        provides strong evidence for a new Eurasian species, for which the and Lampedusa was unknown until that period and
                                                        name C. sicula Miller 1901, was chosen.
                                                                                                                               not yet published.
                                                          Crocidura species living in the Egadi archipelago (Levanzo, Ma-
                                                        rettimo and Favignana), and on Ustica and Gozo, are biometrically        The result of the chromosomal analysis recently car-
                                                        grouped together. They also differ significantly from the Sicilian     ried out on specimens from Sicily and Malta (Vogel,

                                                        species and from the reference samples. However, the Gozo and 1988; Vogel et al., 1989) together with the presence of

                                                        Sicilian specimens share the same karyotype and both populations       a conspicuous osteological sample induced us to carry
                                                        are biochemically very similar. The status of these taxa should be     out a taxonomical revision of this material.
                                                        provisionally related to C. cf. sicula. The independent divergence of
                                                        insular populations is one of the recorded patterns of geographic         This report describes the geographical variation
                                                        variation and could explain these findings. As regards the indepen-    shown by the populations of the central Mediterranean
                                                        dent taxon from Pantelleria, there is evidence of the presence on      islands and is based on a biometrical multivariate anal-
                                                        the island of a C. cf. russula, probably coming from North Africa.     ysis of the mandible.
                                                        The pattern of other vertebrate and invertebrate colonization of

                                                        this island is, in fact, influenced by the African continent. The
                                                        presence of Crocidura on Ustica and Lampedusa was not known

                                                        until now. The mandible fragments found in Lampedusa are insuf-        MATERIALS AND METHODS
                                                        ficient to perform a multivariate analysis, allowing only a rough
                                                        morphological study. This taxon was also preliminarily related to        In order to investigate the biometry of the genus Crocidura, part
                                                                                                                               of the theriological collection of the Zoological Museum of the
                                                        C. cf. sicula.                                                         University (MZPA, Palermo - Italy) was used. Included in the

                                                                                                                                               collection are more than 500 specimens of Crocidura, mostly de-
                                                        KEY WORDS: Crocidura; Insular variation; Multivariate analysis. rived from Strigiformes pellets, found in the Italian mainland,

                                                        ACKNOWLEDGEMENTS                                                       North Africa, and Mediterranean islands such as Sicily, Sardinia,
                                                                                                                               Pantelleria, the Egadi arcipelago (Levanzo, Marettimo, Favignana),
                                                                                                                               Ustica and Gozo (Malta). The specimens were graphically com-

                                                           We would like to thank Prof. B. Massa and Prof. P. Vogel for        pared and measured following the current diagnosis of characters
                                                        improving a draft of this paper with their suggestions and Dr.         generally used in biometrical analysis of the genus Crocidura (Tos-
                                                        Burgio who permitted us to study the specimens from Lampedusa.         chi & Lanza, 1959; Krapp, 1969; Chaline et al., 1974; Jenkins,
                                                        We are also indebted to A. Torre and I. Fais, who provided speci-      1976; Saint Girons et al., 1979; Vesmanis & Vesmanis, 1982;
                                                        mens from Sardinia, to G. Aloise, M. Cagnin, and P. Galeotti for       Poitevin et al., 1986; Hutterer, 1986).
                                                        specimens from Italy and to J. Borg for those from Gozo.
                                                                                                                                  Based on the morphological features, the material from mainland
                                                        (Accepted 15June 1990)                                                 Italy was assigned to C. suaveolens and C. leucodon, whereas the
                                                                                                                               Sardinian shrews were known to be an insular population of C.
                                                                                                                               russula (Catzeflis, 1983a; Contoli et al., 1989). These three species
   1   2   3   4   5   6