Presence of the Eucalyptus gall wasp Ophelimus maskelli and its parasitoid Closterocerus chamaeleon in Portugal: first record, geographic distribution and host preference

The Eucalyptus gall wasp Ophelimus maskelli (Hymenoptera: Eulophidae) and its parasitoid Closterocerus chamaeleon (Hymenoptera: Eulophidae) were observed for the first time in Portugal, in 2006 and 2007, respectively. Data on the distribution of O. maskelli in Portugal, differences in the susceptibility of two host species, Eucalyptus globulus and Eucalyptus camaldulensis, and parasitism by C. chamaeleon are given

Genetic differentiation among host-associated Alebra leafhoppers (Hemiptera: Cicadellidae)

The limited importance ascribed to sympatric speciation pro cesses via host race formation is partially due to the few cases of host races that have been reported among host populations. This work sheds light on the taxonomy of Alebra leafhoppers and examines the possible existence of host races among host-associated populations. The species of this genus show varying degrees of host association with deciduous trees and shrubs and, frequently, host popu lations of uncertain taxonomic status coexist and occasion ally become pests. Allozyme electrophoresis of 21 Greek populations including sympatric, local and geographically distant samples collected on 13 different plant species, show that they represent at least five species: A. albostriella Falle´n, A. viridis (Rey) (sensu Gillham), A. wahlbergi Bo Keywords: host races; leafhoppers; sympatric speciation; sibling species; allozymes; Alebra Introduction Sympatric speciation is a controversial subject in evol utionary biology (see Mayr, 1963; Futuyma and Mayer, 1980; Paterson, 1981; Via, 2001). One of the reasons for this controversy is that sympatric speciation seems to be an extremely rare phenomenon occurring only in very few groups of taxa, represented chiefly by phytophagous insects (Tauber and Tauber, 1977; Menken, 1981; Wood, 1993; Emelianov et al, 1995; Via, 1999; Finchak et al, 2000; Craig et al, 2001). The limited number of reported cases among organisms with sexual reproduction can be at least partially attributed to the fact that taxa undergoing sympatric speciation events must fulfill very restrictive biological and ecological requirements. Most sympatric speciation models demand that there is intraspecific genetic variation in traits that differentially affect the fitness of individuals that colonise new habitats or hosts (Dieckman and Doebeli, 1999; Hawthorne and Via, 2001 but see Higashi et al, 1999 and Takimoto et al, 2000). They assume that selection acting on these traits can prevent genetic exchange between populations (Bush, 1975; Tauber and Tauber, 1977; Diehl and Bush, 1989). In phytophagous insects, this means that host pref erences must be genetically determined and mating should occur on the host (Bush, 1975; Diehl and Bush, Correspondence: D Aguin-Pombo, Department of Biology, University of Madeira, Campus Universitario da Penteada, 9000 Funchal, Madeira, Portugal. E-mail: aguin uma.pt Received 12 December 2000; accepted 13 December 2001 heman and two new species. Of these, one is associated to Quercus frainetto and other is specific to Crataegus spp. Significant genetic differences among sympatric and local host populations were found only in A. albostriella, between populations on Turkey oak, beech and common alder. It is suggested that the last two of these host populations may represent different host races. The results show that both the host plant and geographical distance affect the patterns of differentiation in the genus. The formation of some spec ies seems to have been the result of allopatric speciation events while, for others, their origin can be equally explained either by sympatric or allopatric speciation.info:eu-repo/semantics/publishedVersio

Nota preliminare al ritrovamento di monete romane e medievali nello scavo archeologico del Cortile del Tribunale di Verona

Analisi delle monete rinvenute nel corso dell'indagine archeologica nel Cortile del Tribunale di verona, uno dei primi scavi estensivi nell'Italia settentrional

Le monete

Notizia preliminare dei ritrovamenti monetali provenienti dalle indagini archeologiche dei Teatro romano di Concordia Sagittari

Quello che l'Iconografia rateriana non rappresenta

Vengono confrontate le diverse ipotesi interpretative e cronologiche dell'Iconografia rateriana, lasciando aperta la soluzion

Monete rinvenute nei livelli tardo antichi nello scavo del Capitolium di Verona

Vengono esaminati i ritrovamenti dallo scavo del Capitolium di Veron

Le monete

Vengono considerati tutti reperti numismatici recuperati nell'indagine archeologica del Capitolium di Verona nel tentativo di ricostruire il quadro della circolazione monetaria in et\ue0 tardo antic

Verona: monete provenienti dallo scavo archeologico del fabbricato del Monte dei Pegni

Notizia preliminare a proposito dei ritrovamenti monetali emersi nell'indagine archeologica del Capitolium romano di Veron

Monete

In Lessinia nel corso di una serie prolungata di ricerche di superficie sono stati rinvenuti molti reperti, testimonianza della vita e del lavoro dei pastori in un arco temporale molto lungo. Sono state recuperate anche pi\uf9 di 400 monete, prevalentemente di bronzo del XV secolo, alcune sono anche di et\ue0 romana e provengono da pascoli a quota molto alta

Le monete

Notizia preliminare a proposito dei rinvenimenti monetali emersi nel corso dell'indagine archeologica del teatro romano di Concordia Sagittari