1,721,056 research outputs found

    Diversità Animale

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    titolo originale: Animal Diversity, third editio

    The cave crickets of Greece: a contribution to the study of Southern Balkan Rhaphidophoridae diversity (Orthoptera), with the description of a new species of Troglophilus Krauss, 1879

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    The taxonomy, geographic distribution and ecology of Rhaphidophoridae of Greece are updated herein. At present, 28 species of Dolichopoda Bolívar, 1880 and five species of Troglophilus Krauss, 1879 are known to colonize Greek caves and, in a few circumstances, epigean habitats. Dolichopoda includes a high number of species and shows a wide geographic distribution, including most of Greece. The genus diversity peaks in the Hellenic region, which hosts 28 of the 51 species described thus far. Most of the Dolichopoda species show a high degree of endemism, being recorded from only one or a few caves in restricted geographic areas. The thermo-xerophilic climate characterizing most of the southern Balkan Peninsula and the high fragmentation of the Greek karstic areas could have played an important role in the reduction of gene flow among cave cricket populations, leading to strong isolation and multiple speciation events. All the Dolichopoda species found in the area are highly dependent on caves and show clear adaptations to the subterranean ecosystems. Of the five Troglophilus species known for the area, only two occur in continental Greece, with a very scattered geographic distribution including a few mountain localities in northern and central Greece. The remaining three species are widespread throughout Crete and some Aegean islands. Finally the newly discovered Troglophilus zoiai n. sp. from a cave on the western slope of Mount Parnassos (central Greece) is described

    Pattern of gene flow and genetic divergence in the three Italian species of the cave cricket genus Troglophilus (Orthoptera, Rhaphidophoridae): allozyme data

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    In this paper, we report data on the levels of genetic differentiation among and gene flow within each of the three species of the cave cricket genus Troglophilus living in Italy. We analyzed genetic variation at 18 enzymatic loci in 12 populations of T. cavicola, 6 populations of T. neglectus and 3 populations of T. andreinii. In particular, populations of T. cavicola and T. neglectus were sampled in overlapping geographical areas, from North-Eastern Italy to Slovenia and Croatia. We found a significant isolation by distance pattern for T. cavicola, indicating that the spatial distribution of genetic heterogeneity is best described by a stepping-stone model. The same does not hold for T. neglectus. Within the three species, the pattern of genetic structuring was mainly related to the limestone structure of the area rather than the availability of epigean routes for dispersal. A calibration for gene flow estimates in cave crickets is provided to discriminate between and current gene flow. This supports previous cave cricket data suggesting that detected gene flow is due to historical rather than current connections among populations
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