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Results 1501 to 1530 of 2340:

The morphology of the last instar larva of Aglaope infausta (Lepidoptera: Zygaenidae: Chalcosiinae)

Harald FÄNGER, Clas M. NAUMANN

Eur. J. Entomol. 98 (2): 201-218, 2001 | DOI: 10.14411/eje.2001.038

The larval morphology of the western Palaearctic zygaenid species Aglaope infausta (Linnaeus, 1767) is described and figured in detail. Unlike other members of the zygaenid subfamily Chalcosiinae, the last instar larva of A. infausta has numerous secondary setae and a multitude of cuticular cavities that are devoid of openings. The other chalcosiine genera have primary setae and cuticular cavities with specialized openings through which a defensive secretion can be discharged. Imaginal characters, on the other hand, provide strong evidence for placing Aglaope in the Chalcosiinae.

Pollen preference of the Chrysoperla species (Neuroptera: Chrysopidae) occurring in the crop environment in western France

Johanna VILLENAVE, Bruno DEUTSCH, Thierry LODÉ, Elizabeth RAT-MORRIS

Eur. J. Entomol. 103 (4): 771-777, 2006 | DOI: 10.14411/eje.2006.104

Two species of the Chrysoperla carnea complex: Ch. carnea sensu Henry and Ch. lucasina, occur in the crop environment in western France. Within the framework of a conservation biological control program for protected seed crops, the pollen consumption of these common green lacewings was investigated. The diverticulum contents of collected specimens were analysed to determine their food preference. Ch. carnea sensu Henry and Ch. lucasina are opportunistic feeders, which are attracted to large patches of flowering plants. The establishment of monitoring an attractive environment for these predators is discussed.

Adult demography, dispersal and behaviour of Brenthis ino (Lepidoptera: Nymphalidae): how to be a successful wetland butterfly

Kamil ZIMMERMANN, Zdenìk FRIC, Ladislava FILIPOVÁ, Martin KONVIÈKA

Eur. J. Entomol. 102 (4): 699-706, 2005

Continent-wide loss of traditionally managed humid meadows is raising concern for associated butterfly specialists across Europe. However, not all species associated with this biotope are threatened, and the Lesser Marbled Fritillary (Brenthis ino) has even spread locally. We employed mark-recapture and transect walks to study its population structure and patterns of landscape occupancy in a hilly region of western Bohemia, Central Europe, to determine which life history or demography traits might be responsible for its success. A population studied by mark-recapture harboured more than 1000 individuals and was interconnected with other populations. This was further supported by a fit of the inverse power function to dispersal data. Observations of adult behaviour revealed a broad host plant range: at least three species of plants were used by the single population. On a landscape scale, the butterfly exhibited an aggregated distribution matching its host plants. It was associated with the distribution of characteristic plants and butterflies of semi-natural humid meadows, but its frequency exceeded those of other humid grasslands specialists. The relatively broad host range coupled with varying biotope requirements of individual host plant species results in a wide biotope range for the butterfly, explaining its persistence in fragmented Central European landscapes.

Seasonal adaptations of green lacewings (Neuroptera: Chrysopidae)

Michel CANARD

Eur. J. Entomol. 102 (3): 317-324, 2005 | DOI: 10.14411/eje.2005.049

Seasonal adaptations of green lacewings (Neuroptera: Chrysopidae) and their role in the control of aphid populations are discussed. The chrysopids of temperate zones face seasonal changes and must escape cyclic adversity. One way is via the number of broods per year. Most green lacewings are facultatively multivoltine, with the succession of generations most often regulated by photomediated diapause. Others are univoltine and some extend their life-cycle to two years in cold or dry environments. Synchronization is an important feature of seasonality, often starting in spring. In univoltine species, it is sometimes the result of subtle mechanisms, such as double contradictory signals (short plus long day lengths) for reactivation in spring, or a multi-receptivity of the preimaginal instars to photoperiod throughout a year, combined with photo-controlled and synchronized egg laying in late summer. Only one North American species is known to enter a surnumerary food-mediated diapause in summer. Every postembryonic instar may undergo diapause depending on the species. The timing and impact of the spring resumption in aphid consumption depends on their overwintering strategy.
As far is known, chrysopids are intolerant of freezing, but their supercooling points are low enough to enable them to endure hard frost. The numbers of overwintering specimens of green lacewings in the field depend on the structure of the assemblages in the previous growing season. Three examples are used to show that the overwintering populations are different in the different biotopes and dependent on the way the dominant species overwinter. Artificial chambers proposed for overwintering adults of common green lacewings afford them protection during diapause and enhance their predatory efficiency in spring.

Description of the larval stages of Gymnochthebius jensenhaarupi and phylogenetic analysis of the relationships with other species of the subfamily Ochthebiinae (Coleoptera: Hydraenidae)

Juan A. DELGADO, Miguel ARCHANGELSKY

Eur. J. Entomol. 102 (2): 231-240, 2005 | DOI: 10.14411/eje.2005.036

The three larval instars of Gymnochthebius jensenhaarupi (Knisch, 1924) are described and illustrated, including a detailed analysis of their chaetotaxy and porotaxy. The specimens used in this study were collected with adults of G. jensenhaarupi and have been identified as such by association. Comparative notes on the morphology of these larvae with other species of the subfamily Ochthebiinae are given. A hypothesis of phylogenetic relationships between G. jensenhaarupi and other members of Ochthebiinae with thoroughly described larvae is presented. The monophyly of Ochthebiinae is supported by additional larval features. On the other hand Ochthebius, as currently composed, seems to by paraphyletic. Gymnochthebius Orchymont, 1943 is confirmed as the sister group of Aulacochthebius Kuwert, 1887.

Testing the impact of laboratory reared indigenous leafroller (Lepidoptera: Tortricidae) parasitoids (Hymenoptera: Ichneumonidae, Braconidae) on sentinel hosts in controlled orchard releases

Joan E. COSSENTINE

Eur. J. Entomol. 105 (2): 241-248, 2008 | DOI: 10.14411/eje.2008.034

Leafrollers can experience high levels of indigenous parasitism in organically managed apple orchards and the augmentative release of specific parasitoid species to suppress these secondary pests may be advantageous in orchards converting to non-chemical pest management. Caged and uncaged releases of two ichneumonid [Apophua simplicipes (Cresson) and Glypta variegata Dasch] and two braconid (Macrocentrus linearis Nees and Apanteles polychrosidis Viereck) koinobiont endoparasitoids of the obliquebanded leafroller, Choristoneura rosaceana (Lepidoptera: Tortricidae) on host-infested potted apple trees were conducted to assess the parasitoids' abilities to find and successfully parasitize sentinel hosts under orchard conditions. Seasonal timing of the trials varied for each parasitoid species, based on their relative performance under simulated summer/fall conditions in laboratory trials. After the release of five or fifty parasitoid females, the mean percent parasitism of leafroller larvae collected from infested trees ranged from 0 to 75% depending on the parasitoid species involved. Although caged releases tended to increase the percentage of live parasitized hosts in release treatments, uncaged releases provided a more realistic assessment of the parasitoid's ability to seek and find hosts within an infested area over a longer period. Release of the large, solitary A. simplicipes, had the most significant impact on the host population density.

BOOK REVIEW: Gay T., Kehimkar I.D. & Punetha J.: Butterflies of India.

Z. FRIC

Eur. J. Entomol. 106 (3): 404, 2009 | DOI: 10.14411/eje.2009.051

Oxford University Press, New Delhi, 2008, 71 pp., ISBN 978-0-19-568801-6.

BOOK REVIEW: Van Driesche R., Hoddle M. & Center T.: Control of Pests and Weeds by Natural Enemies. An Introduction to Biological Control.

I. HODEK

Eur. J. Entomol. 106 (2): 323, 2009 | DOI: 10.14411/eje.2009.038

Blackwell, Malden, MA & Oxford, 2008, 473 pp. ISBN 978-1-4051-4571-8. Price: USD 69.95.

Limited variation in mitochondrial DNA of maize-associated Ostrinia nubilalis (Lepidoptera: Crambidae) in Russia, Turkey and Slovenia

Sugihiko HOSHIZAKI, Ryôta WASHIMORI, Shun-Ichi KUBOTA, Andrei N. FROLOV, Daisuke KAGEYAMA, Stanislav GOMBOC, Suguru OHNO, Sadahiro TATSUKI, Yukio ISHIKAWA

Eur. J. Entomol. 105 (4): 545-552, 2008

A sequence analysis of the mitochondrial cytochrome oxidase subunit II (COII) gene in Russian and Turkish maize-associated populations of Ostrinia nubilalis and a Slovenian population of O. nubilalis probably infesting maize revealed little diversity. This lack of diversity may have resulted from bottleneck event(s) when the maize-associated population of O. nubilalis expanded from small population(s) in association with the cultivation of maize in Europe ca. 500 years ago. In the genealogy of COII genes obtained in the present and previous studies, Eurasian samples were substantially differentiated from North American samples. Since the North American population of O. nubilalis came from Europe, our finding suggests that there is geographical differentiation in European maize-associated O. nubilalis, and that maize-associated populations of O. nubilalis expanded multiple times in Europe. Finally, a phylogenetic analysis of the COII gene did not support that O. nubilalis and O. furnacalis are the closest relatives within the O. furnacalis species group.

BOOK REVIEW: Nickel H.: The Leafhoppers and Planthoppers of Germany (Hemiptera, Auchenorrhyncha). Patterns and Strategies in a Highly Diverse Group of Phytophagous Insects.

P. LAUTERER

Eur. J. Entomol. 101 (2): 272, 2004

Pensoft Series Faunistica No. 28. Pensoft Publishers, Sofia-Moscow wt Goecke & Evers, Keltern, 2003, 460 pp. ISSN 1312-0174. Hardcover. Price USD 67.00

BOOK REVIEW: Lampel G. & Meier W.: HEMIPTERA: STERNORRHYNCHA - APHIDINA. Vol. 2: APHIDIDAE. Fauna Helvetica 16.

J. HAVELKA

Eur. J. Entomol. 106 (2): 192, 2009 | DOI: 10.14411/eje.2009.023

Centre Suisse de cartographie de la faune & Schweizerische Entomologische Gesellschaft, Neuchâtel, 2007, 523 pp. ISBN 978-2-88414-028-7. Price EUR 56.00, USD 83.00.

BOOK REVIEW: Vallenduuk H.J. & Moller Pillot H.K.M.: CHIRONOMIDAE LARVAE. General Ecology and Tanypodinae.

J. MATÌNA

Eur. J. Entomol. 106 (2): 324, 2009 | DOI: 10.14411/eje.2009.039

KNNV Publishing, Zeist, 2007, 144 pp. ISBN 978-90-5011-259-8. Price EUR 69.50.

Host ant specificity of large blue butterflies Phengaris (Maculinea) (Lepidoptera: Lycaenidae) inhabiting humid grasslands in East-central Europe

Magdalena WITEK, Ewa B. ¦LIWIÑSKA, Piotr SKÓRKA, Piotr NOWICKI, Marta WANTUCH, Vladimír VRABEC, Josef SETTELE, Michal WOYCIECHOWSKI

Eur. J. Entomol. 105 (5): 871-877, 2008 | DOI: 10.14411/eje.2008.115

Butterflies of the genus Phengaris have a highly specialised life cycle involving an obligatory relationship with Myrmica ants. A knowledge of the host ant specificity is essential for understanding the relationship between a particular Phengaris species and its hosts and also important for the conservation of these butterflies. Data on host ant specificity were collected in Poland, the Czech Republic, Slovakia and Ukraine. Five different Myrmica species were used by P. teleius as hosts (M. scabrinodis, M. rubra, M. ruginodis, M. rugulosa and M. gallienii) and at most localities it was not possible to distinguish a primary host - i.e. several Myrmica species were parasitized to similar extents. Three populations of P. nausithous were found in Poland and Ukraine. In every case, M. rubra was its primary host, although in the Kraków region (Poland) two nests of M. scabrinodis and two of M. ruginodis were infested by this butterfly species. P. alcon in the four populations investigated in Poland and Ukraine invariably only used M. scabrinodis as a host despite the presence of other Myrmica species. These results obtained suggest lack of host specificity in P. teleius and high host specificity in P. nausithous, which mainly uses M. rubra as its host across Europe. Moreover, the three populations of P. alcon investigated seem to be highly specific and use M. scabrinodis as a host, which confirms the high local specialisation of these populations.

Isolation and characterization of polymorphic microsatellite loci in the bamboo locust Rammeacris kiangsu (Orthoptera: Acrididae)

Wen-Juan XUAN, Yan-Yan ZHANG, Na-Na LIU, Jin-Liang ZHAO, Guo-Fang JIANG

Eur. J. Entomol. 106 (4): 663-665, 2009 | DOI: 10.14411/eje.2009.082

Twelve polymorphic microsatellite loci were developed and characterized from the bamboo locust, Rammeacris kiangsu, based on enriched genomic libraries. Analysis of 30 individuals showed that the number of alleles ranged from seven to 25 with the observed heterozygosity ranging from 0.333 to 0.767 and expected heterozygosity from 0.784 to 0.963. Test of cross-species amplification showed that some of these microsatellite markers could be used for studying other species such as Ceracris nigricornis, C. fasciata, and Chorthippus brunneus.

BOOK REVIEW: Regnault-Roger C., Philogene B.J.R. & Vincent C. (eds): Biopesticides of Plant Origin.

J. HAVELKA

Eur. J. Entomol. 106 (2): 224, 2009 | DOI: 10.14411/eje.2009.029

Intercept Ltd - Lavoisier Publ. Inc., Hampshire, UK, Secaucus, NJ, USA, 313 pp., 2005, ISBN 2-7430-0675-7. Price EUR 100.00, USD 136.00, GBP 71.00.

Characterization of ten polymorphic microsatellite markers for the endemic Chapman's ringlet, Erebia palarica (Lepidoptera: Nymphalidae)

Marta VILA, Tomás LATASA, Juan J. PINO, Georges VERHULST

Eur. J. Entomol. 106 (4): 485-490, 2009 | DOI: 10.14411/eje.2009.061

Ten polymorphic microsatellite loci were developed for the butterfly Erebia palarica (Nymphalidae, Satyrinae), endemic to NW Spain. Polymorphism for 20 individuals from a NW Spanish population (Ancares) and 15 more from two other nearby localities (Courel, Trevinca) was assessed. Overall, the number of alleles per locus ranged from six to 24. Ancares showed an average number of alleles per locus of 14.30 (SD = 5.32), observed heterozygosity of 0.753 (SD = 0.14) and unbiased expected heterozygosity of 0.818 (SD = 0.114). Genotypic frequencies conformed to the Hardy-Weinberg equilibrium at Ancares, and there was no evidence of linkage disequilibrium. Multilocus genotypes resulting from this set of markers will be useful for determining genetic diversity and differentiation within and among populations of this local endemic butterfly in NW Spain. Of the six loci amplified in the closely related species, Erebia meolans, five were polymorphic.

Effects of habitat loss and fragmentation on the abundance and species richness of aphidophagous beetles and aphids in experimental alfalfa landscapes

Audrey A. GREZ, Tania ZAVIEZO, Sandra DÍAZ, Bernardino CAMOUSSEIGT, Galaxia CORTÉS

Eur. J. Entomol. 105 (3): 411-420, 2008 | DOI: 10.14411/eje.2008.052

In agro-ecosystems, habitat loss and fragmentation may alter the assemblage of aphidophagous insects, such as foliar-foraging (coccinellids) and ground-foraging predators (carabids), potentially affecting intraguild interactions. We evaluated how habitat loss (0, 55 and 84%), fragmentation (1, 4 and 16 fragments) and their combination affected the abundance and species richness of coccinellids and carabids, and aphid abundance, both in the short-term (summer: December to February) and over a longer time span (autumn: March to May), when different demographic mechanisms may participate. We created four types of 30 × 30 m patches (landscapes) in which alfalfa was grown: Control (1F - 0%, 30 × 30 m patch of alfalfa with no fragmentation or habitat loss), 4F - 55% (4 alfalfa fragments, with 55% total habitat loss), 4F - 84% (4 alfalfa fragments, with 84% total habitat loss), and 16F - 84% (16 alfalfa fragments, with 84% total habitat loss). Each landscape type was replicated five times. Insects were sampled by sweep-netting and pitfall traps, from December (summer) to May (autumn). Total abundance and species richness of carabids, in the short-term, was highest in the 16F - 84% landscapes. Total abundance of adult coccinellids was similar among landscapes, but at the species level Hyperaspis sphaeridioides, in the short-term, and Adalia bipunctata, in the long-term, had their highest densities in fragments within landscapes with high habitat loss (84%), independently of habitat fragmentation. Species richness in the long-term was higher in the landscapes with 84% habitat loss. Among aphids, in the long term Aphis craccivora was less abundant in landscapes with high habitat loss and fragmentation (16-84%), while Therioaphis trifolii showed the opposite trend. These results suggest that habitat loss and fragmentation may increase the density and diversity of aphidophagous insects, while their effects on aphids are more variable.

Long-distance wind-borne dispersal of the moth Cornifrons ulceratalis (Lepidoptera: Crambidae: Evergestinae) into the northern Mediterranean

Jordi DANTART, Constantí STEFANESCU, Anna ÀVILA, Marta ALARCÓN

Eur. J. Entomol. 106 (2): 225-229, 2009 | DOI: 10.14411/eje.2009.030

On October 2006, during an episode of abnormally warm weather, the African moth Cornifrons ulceratalis (Lederer, 1858) was captured simultaneously for the first time in several sites in north-eastern Spain, the Balearic Islands and southern France. A deep depression situated over the Atlantic at the time gave rise to warm south-westerly winds, accompanied by suspended dust, that blew towards the north-western Mediterranean Basin. Back trajectories of air masses at two different altitudinal levels indicate that the moths most probably originated from an area located in Morocco and northern Algeria, where C. ulceratalis can be extremely abundant. With winter approaching, this invasion of a typically non-migratory species into the north-western Mediterranean Basin provides a good example of the so-called "pied piper" phenomenon, by which wind-borne insects may be carried into areas unfavourable for survival or reproduction. However, because climate change may make the establishment of this and other African species more likely in the future, we suggest that monitoring of this process may become an essential issue in the coming years.

BOOK REVIEW: Holland J.M. (ed.): The Agroecology of Carabid Beetles.

A. HONÌK

Eur. J. Entomol. 101 (1): 36, 2004 | DOI: 10.14411/eje.2004.008

Intercept, PO Box 716, Andover, Hampshire SP10 1YG, UK, 2002, xiv+356 pp.

Spatial population structure of the predatory ground beetle Carabus yaconinus (Coleoptera: Carabidae) in the mixed farmland-woodland satoyama landscape of Japan

Yoshitake KAGAWA, Kaoru MAETO

Eur. J. Entomol. 106 (3): 385-391, 2009 | DOI: 10.14411/eje.2009.049

To conserve the predators and parasitoids of agricultural pests it is necessary to understand their population structure in a mixed landscape, and to consider the spatial and temporal changes in their distribution and movement of adults and larvae. We studied the distribution and movement of the ground beetle Carabus yaconinus (Coleoptera: Carabidae), which inhabits farmland-woodland landscapes. We placed a large number of pitfall traps along the border between a wood and an orchard and counted the number of C. yaconinus adults and larvae caught in the traps from 13 April to 28 June 2005. Some of the adults were marked before they were released. Adults were most abundant at the edge of the wood and the number caught gradually decreased when entering into the wood. In contrast, larvae were only found in the interior of the wood, although they moved closer to the edge of the wood as they matured. Adult females were collected within the wood and neighbouring orchards more frequently than adult males. It is likely that females enter woodlands in search of oviposition sites and leave woodlands in search of high-protein food sources to support reproduction. For sustaining populations of C. yaconinus it is necessary to have woodlands of at least 60 m in width adjacent to farmland. It is possible to design an appropriate landscape if the habitat requirements of the predatory arthropods are well understood.

Chemical cues mediating aphid location by natural enemies

Eduardo HATANO, Grit KUNERT, J.P. MICHAUD, Wolfgang W. WEISSER

Eur. J. Entomol. 105 (5): 797-806, 2008 | DOI: 10.14411/eje.2008.106

There is increasing evidence that chemical cues play a pivotal role in host selection by the natural enemies of aphids. We use Vinson's (1976) division of the host selection process into habitat location, host location and host acceptance for both parasitoids and predators and review what is known about the role of semiochemicals in aphid selection by natural enemies. For habitat location (i.e. detection of the host plant), volatiles emitted by plants after aphid attack have been described for a number of plant-aphid interactions. These synomones indicate not only the presence of an aphid host plant to the predator or parasitoid, but also the presence of aphids. Volatiles emitted from undamaged host plants are often attractive to aphid parasitoids, but less so for predators. Host location by the natural enemy on the food plant is guided by semiochemicals that mostly originate from the aphids, in particular aphid alarm pheromone, honeydew, or the smell of the aphid itself. Host acceptance is guided by contact chemicals for both predators and parasitoids. In parasitoids, host recognition may be based on visual cues or on contact chemicals on the aphid's cuticle, whereas host acceptance is ultimately based on as yet unknown substances within the aphid's hemolymph. While it appears that many predators and parasitoids are attracted to the same semiochemicals, synergistic and antagonistic interactions among chemical substances have only rarely been investigated. More research into model systems is needed, not only to identify important semiochemicals, but also to determine their range of attraction. Recent progress in the development of analytical techniques has created new opportunities to improve our understanding of the chemical ecology of aphid-natural enemy interactions in the coming years.

Revision of Afrocrania (Coleoptera: Chrysomelidae: Galerucinae) Part II: Species in which the males lack head cavities or extended elytral extrusions

Thomas WAGNER

Eur. J. Entomol. 104 (4): 801-814, 2007 | DOI: 10.14411/eje.2007.101

In this second part of the revision of Afrotropical Afrocrania Hincks, 1949 (= Pseudocrania Weise, 1892, not Pseudocrania MCoy, 1851), a group of Galerucinae restricted to Africa, additional material is revised. Herein, species in which the males lack deep head cavities, partly horned antennomeres, or extended elytral extrusions, but usually have small post-scutellar extrusions or depressions, are considered. Material of Afrocrania pauli (Weise, 1903), comb. n. (= Candezea pauli Weise, 1903), and A. famularis (Weise, 1904), comb. n. (= Monolepta famularis Weise, 1904; = Candezea atripennis Laboissière, 1931, syn. n.) is studied. Lectotypes are designated for A. pauli, A. famularis and C. atripennis. Six new species, A. aequatoriana sp. n., A. minima sp. n., A. nigra sp. n., A. occidentalis sp. n., A. pallida sp. n. and A. weisei sp. n. are described. Distribution patterns are mapped. Together with the already revised species there are 16 valid Afrocrania species are hitherto known. Its phylogenetic position within the Galerucinae is discussed, identification keys to males and females for all known taxa are presented.

Heterochromatin heteromorphism in Holhymenia rubiginosa (Heteroptera: Coreidae)

María José BRESSA, María José FRANCO, María Ayelén TOSCANI, Alba GRACIELA PAPESCHI

Eur. J. Entomol. 105 (1): 65-72, 2008 | DOI: 10.14411/eje.2008.009

Heterochromatin is one of the most dynamic components in the genome of species. Previous studies on the heterochromatin content and distribution in Heteroptera (insects with holokinetic chromosomes) have shown that the species belonging to the family Coreidae are interesting model organisms since they show very diverse C bands patterns. In the present work, we analyzed the C-band pattern in individuals of Holhymenia rubiginosa from different populations collected in different years. This species has the diploid karyotype 2n = 27/28 = 24 + 2m + X0/XX (male/female). C-bands are terminally, subterminally or interstitially located on 10-17 chromosomes and a remarkable heterochromatin heteromorphism is observed in the meiotic bivalents: in the presence/absence of bands, in the size of bands and number of bands. A heteromorphism is also inferred in the number of ribosomal genes from the difference in the fluorescent in situ hybridization signals between NOR-homologues. Chiasmata are generally located opposite to conspicuous C-bands, but in some bivalents chiasmata are also observed in close proximity to C-bands. Considering the striking variation in heterochromatin content between individuals and populations it is suggested that heterochromatin should be selectively neutral in H. rubiginosa.

BOOK REVIEW: Pape T., Bickel D. & Meier R. (eds): DIPTERA DIVERSITY: Status, Challenges and Tools.

M. CHVÁLA

Eur. J. Entomol. 106 (4): 672, 2009 | DOI: 10.14411/eje.2009.084

Brill Academic Publishers, Leiden, Boston, 2009, 459 pp. ISBN 978 90 04 14897 0. Price EUR 119.00, USD 186.00.

BOOK REVIEW: H.F. van Emden & R. Harrington (eds): Aphids as Crop Pests.

J. HAVELKA

Eur. J. Entomol. 106 (1): 56, 2009 | DOI: 10.14411/eje.2009.008

CABI Publishing, London, 2007, 717 pp. ISBN 978 0 85199 819 0. Price USD 290.00 / EUR 230.00 / GBP 147.00.

Genetic characterization of the Balkan endemic species, Merodon desuturinus (Diptera: Syrphidae)

Vesna MILANKOV, Gunilla STÅHLS, Ante VUJIÆ

Eur. J. Entomol. 105 (2): 197-204, 2008 | DOI: 10.14411/eje.2008.028

Variation of 15 nuclear allozyme genes and a 708 bp fragment of DNA sequence of the mitochondrial cytochrome c oxidase subunit I (COI) gene were surveyed in a population of a hoverfly species, Merodon desuturinus Vujiæ, ©imiæ & Radenkoviæ, 1995 (Diptera, Syrphidae), endemic to the Balkan Peninsula. Based on phylogeography and taxonomy, Merodon desuturinus is of special interest from a biogeographical and conservation perspective. Characterization and determination of genetic relationships between M. desuturinus and taxa of the M. aureus, M. avidus, and M. ruficornis groups on the Balkan Peninsula were estimated based on molecular markers (allozymes and COI sequences). We observed that the mean number of alleles per allozyme locus was 1.1, frequency of polymorphic loci 0.067, and heterozygotes were absent. Our results showed an extremely low genetic variability in the M. desuturinus population sampled. We suggest that this taxon calls for a conservation management plan, as it is likely a vulnerable and threatened taxon, an endemic, spatially divided species and represents a unique genetic unit on the Balkan Peninsula.

BOOK REVIEW: Gadau J. & Fewell J. (eds): ORGANIZATION OF INSECT SOCIETIES, FROM GENOM TO SOCIOCOMPLEXITY.

J. ®ÏÁREK

Eur. J. Entomol. 106 (3): 361-362, 2009 | DOI: 10.14411/eje.2009.045

Harvard University Press, Cambridge, MA, and London, UK, 2009, 617 pp., hard cover. ISBN 978-0-674-03125-8. Price USD 79.95.

No genetic differentiation in the rose-infesting fruit flies Rhagoletis alternata and Carpomya schineri (Diptera: Tephritidae) across central Europe

Annette KOHNEN, Volker WISSEMANN, Roland BRANDL

Eur. J. Entomol. 106 (2): 315-321, 2009 | DOI: 10.14411/eje.2009.037

After the last glacial retreat in Europe, multiple recolonizations led to intraspecific differentiation in many of the recolonizing taxa. Here we investigate the genetic diversification across central Europe in two recolonizing taxa, the tephritid fruit flies Rhagoletis alternata (Fallén, 1814) and Carpomya schineri (Loew, 1856), which attack rose hips. Analysis of amplified and sequenced fragments of the mitochondrial genes encoding cytochrome oxidase I (800 bp), cytochrome oxidase II (470 bp) and cytochrome b (450 bp), indicate that all the individuals of R. alternata (n = 21) collected from across Europe share the same haplotype. Two individuals of C. schineri form Berlin, which is further north of the range than previously reported in the literature, differ from the other individuals (n = 13) in one nucleotide position on the cytochrome oxidase II gene fragment. This level of genetic variation in sequences with a summed length of 1720 bp is unexpectedly lower than in other insect taxa (n = 63). This might have been caused by a selective sweep by a cytoplasmic symbiont such as Wolbachia, or a recent range expansion associated with a host shift or a single recolonization event.

Effects of Wolbachia-targeted tetracycline on a host-parasitoid-symbiont interaction

Hosagavi P. PUTTARAJU, Bandekodigenahalli M. PRAKASH

Eur. J. Entomol. 102 (4): 669-674, 2005

The uzifly, Exorista sorbillans (Diptera: Tachinidae), a parasite of the silkworm, Bombyx mori L. (Lepidoptera: Bombycidae), causes heavy losses to the silk industry. This parasitoid harbours a Wolbachia endosymbiont, which controls the fly's reproduction. In the present study a method for curtailing this notorious pest by administering Wolbachia-targeted tetracycline via its silkworm host's diet is investigated. Tetracycline not only influenced the larval growth of the silkworms' by decreasing larval duration, increased silk production and fecundity, without affecting hatchability, it also decreased the reproductive fitness of the uzifly endoparasite by killing the Wolbachia. The antibiotic exerts a beneficial influence by affecting the intestinal flora of silkworm larvae. On the other hand the reproductive fitness of uzifly was greatly reduced in terms of different reproductive abnormalities. When male and female flies that emerged from treated host silkworms were crossed and males from untreated hosts and females from treated hosts were crossed, approximately 72% and 97% of the eggs failed to hatch, respectively. However, of the eggs from crosses between male and female flies that emerged from untreated hosts and between males from treated hosts with females from untreated hosts, an average of 30% failed to hatch and the Wolbachia infection enhanced the fecundity of uziflies. These results demonstrate that the Wolbachia may be essential for uzifly reproduction and that Wolbachia-targeted antibiotics have a beneficial influence on silkworm growth while decreasing the reproductive fitness of the uzifly, E. sorbillans.

Provisioning patterns and choice of prey in the digger wasp Cerceris arenaria (Hymenoptera: Crabronidae): the role of prey size

Carlo POLIDORI, Roberto BOESI, Francesco ISOLA, Francesco ANDRIETTI

Eur. J. Entomol. 102 (4): 801-804, 2005

At a nest site in Northern Italy of females of the weevil-hunting digger wasp Cerceris arenaria L. (Hymenoptera: Crabronidae) the provisioning activity and predator-prey relationship were investigated, in particular their specialization in choice of prey. Females were active from middle of June to end of July, and from 8.00 to 19.00. The wasps made provisioning flights throughout the day, mostly in late morning and early afternoon. Individual wasps generally only hunted for 1 or 2 prey species of all those available, maybe because of their higher abundance. The size of prey, which is positively correlated with that of the female wasps, seems to be the main factor determining choice of prey. The nature of the provisioning flights seems to be related to the size of the prey, being more frequent and shorter for smaller weevils. The correlation between prey and wasp biomass is discussed in relation to the size range of the wasps.

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