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  • 1
    Electronic Resource
    Electronic Resource
    Influence of the egg parasitoidPlatytelenomus busseolae [Hym.: Scelionidae] on the population ofSesamia nonagrioides [Lep.: Noctuidae] in central greece (1990)
    Springer
    BioControl 35 (1990), S. 61-70 
    Details
    ISSN: 1573-8248
    Keywords: Sesamid ; Platytelenomus ; egg parasitoid ; maize ; sex ratio ; parasitism ; Sesamia ; Platytelenomus ; maïs ; parasitoides oophages ; sex ratio ; parasitisme
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Le parasitoïde scelionid,Platytelenomus busseolae, a été recueilli des ooplaques de la sésamie dans la région d'Istiaea, en Grèce Centrale. Le parasitisme naturel a été étudié pendant les années 1986 et 1987. Un nombre de 3 382 ooplaques avec un total de 205 227 œufs ont été recueillis. Les premiers œufs parasitisés ont été récoltés fin-juillet, début-août et les derniers à la mi-octobre. En 1986, 76,2% des ooplaques et 42,8% des œufs étaient parasitisés, mais en 1987 les valeurs respectives étaient 27,6% et 12,9%. L'activité moindre du parasitoïde en 1987 serait due aux conditions climatiques hivernales et estivales. En 1987, la sex ratio, femalle: mâle, a été 1,5: 1 et 26,2% des ooplaques seulement ont donné naissance à des ♂♂. Les ♀♀ fécondées ont produit 3 fois plus de ♀♀ que de ♂♂. Dans des conditions climatiques favorables, le parasitoïde peut jouer un rôle important dans la lutte biologique contre la sésamie.
    Notes: Abstract The egg parasitoid,Platytelenomus busseolae (Gahan) (Hymenoptera: Scelionidae) was recorded from egg masses of the corn stalk borer,Sesamia nonagrioides (Lefebvre) (Lepidoptera: Noctuidae) on maize in the area of Istiaea, Central Greece. Natural parasitism was studied during the years 1986, 1987. A total of 3,382 egg masses, containing 205,227 eggs, was collected from corn fields. Parasitized eggs were found from end July to mid-October. In 1986. 76.2% of the egg masses and 42.8% of all eggs were parasitized, while in 1987, respective values were 27.6% and 12.9%. The inferior performance of the parasitoid in 1987 may be due to the unfavorable winter and summer conditions. Parasitism decreased when the host population was at its peak, but it increased again within 1 to 3 weeks. A small percentage of egg masses was completely parasitized (9.5% and 4.7% for the 2 years respectively). In 1987, the sex ratio, ♀♀/♂♂ was 1.5: 1 and 26.2% of the egg masses produced only ♂♂. Mated ♀♀ produced 3 times more ♀♀ than ♂♂. It seems that the parasitoid, under favorable weather conditions, can play a significant role in the control of the corn stalk borer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374302
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    Paper (German National Licenses)
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  • 2
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    Detection potential of the KM3NeT detector for high-energy neutrinos from the Fermi bubbles (2013)
    Elsevier Science Limited
    Details
    Publication Date: 2022-05-04
    Description: A recent analysis of the Fermi Large Area Telescope data provided evidence for a high-intensity emission of high-energy gamma rays with a E 2 spectrum from two large areas, spanning 50 above and below the Galactic centre (the ‘‘Fermi bubbles’’). A hadronic mechanism was proposed for this gamma-ray emission making the Fermi bubbles promising source candidates of high-energy neutrino emission. In this work Monte Carlo simulations regarding the detectability of high-energy neutrinos from the Fermi bubbles with the future multi-km3 neutrino telescope KM3NeT in the Mediterranean Sea are presented. Under the hypothesis that the gamma-ray emission is completely due to hadronic processes, the results indicate that neutrinos from the bubbles could be discovered in about one year of operation, for a neutrino spectrum with a cutoff at 100 TeV and a detector with about 6 km3 of instrumented volume. The effect of a possible lower cutoff is also considered.
    Description: Published
    Description: 7–14
    Description: 1.8. Osservazioni di geofisica ambientale
    Description: JCR Journal
    Description: restricted
    Keywords: Neutrino telescope ; Fermi Bubbles ; KM3NeT ; 03. Hydrosphere::03.03. Physical::03.03.05. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    Gas hydrates in the Eastern Mediterranean: occurrence and biogeochemical environment compiled from detailed sampling of the Anaximander Mountains (2005)
    In:  Geophysical Research Abstracts, Vol. 7, 05176, 2005
    Details
    Publication Date: 2020-02-12
    Description: Within the framework of the EU Project ANAXIMANDER, two expeditions with R/V Aegaeo allowed an extensive investigation of the Anaximander mud volcanoes in May 2003 and November 2004. Gas hydrates (GH) have been encountered and sampled at three mud volcanoes (MV), namely Amsterdam, Kazan, and the newly discovered Thessaloniki MV. At Amsterdam MV we did not only encounter GH within the crater but also on the mud flow of the southern slope. These sites span a considerable range of water depths, from 2236 m (A’dam MV)to 1263 m (Thessaloniki MV), the latter depth being close to the upper boundary of the hydrate stability zone (bottom water temperatures of about 14 ̊C). Gas hydrates recovered from gravity cores were either stored in steel vessels and kept at -80 ̊C or put into gas tight bottles filled with brine solution where the gas from the dissolving hydrate is captured, simultaneously replacing part of the brine. The first deployment of a newly developed autoclave piston corer in this area allowed the recovery of the total gas volumes from the gas hydrate-bearing sediments of the three MV. These data lay the base for the determination of the in situ methane and hydrate content in the shallow sediments. Additionally, gas analyses on sediment samples (dissolved and adsorbed gas) have been performed. With this extensive data set, we were able to draw a solid picture of the gas hydrate occurrence at the specific sites. This picture is refined by geological studies and microbiological description of the gas hydrate environment. Whereas the gas hydrates at Amsterdam MV appear in distinct pieces of several cm in diameter, hydrate crystals at Kazan MV are dispersely distributed and only several mm in size. The latter were therefore hard to recover and dissolved to a large extent in the sediment matrix before and during pore water sampling. This results in a stronger chlorinity minima at Kazan MV (as low as 10 per mil) compared to Amsterdam MV. At both sites, GH occurred at various sub-surface depths, ranging from the maximum penetration (mainly about 150 cm) to near the seafloor. Related methane concentrations are up to 1000 μ mol/l wet sediment at shallower depth (box corer samples), and reach values of almost 5000 μ mol/l wet sediment close to larger pieces of hydrate (gravity corer samples). The total gas volumes which were retrieved from pressurized cores were about twice as much at Amsterdam than at Kazan MV. In both mud volcanoes, the bacterial and archaeal communities were dominated by representatives of the δ Proteobacteria and ANME-1 group. Methanogenic archaea, however, were only found in Kazan, at the lower limit of the inferred zone of anaerobic oxidation of methane. At Kula MV (where GH had been sampled on earlier cruises) we found only evidence of GH (gassy texture of the sediment), however, salinities are rather low here, too (down to 21 per mil). Because of the oxic surface of these sediments (which implies no recent MV activity) and the very stiff sediment matrix towards the base of some of the cores, the reason for the observed salinity decrease remains puzzling and will be subject to further studies using specific proxies to trace a possible source.
    Type: info:eu-repo/semantics/conferenceObject
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