Nach Hamburg eingeschleppte Collembola und Zygentoma

The importation of 18 Collembola and 7 Zygentoma species to Hamburg is recorded. The most are found on living plants (Orchidaceae and Cactaceae) and in wood. OnlyLepisma saccharina L. andLepismodes inquilinus Newman are house and stored-product pests. The first is common in houses, but don't live in open air in Germany, the later has infected some bakeries in Hamburg only; others findings in Germany are also mentioned. The distribution and origin countries of the Collembola are mostly still not or unsufficiently known, perhaps some are original cosmopolitan and some others man made cosmopolitan. Therefore the literary references on distribution are often not congruent to the declaration of exporting countries.     

Über Anacanthotermes ochraceus (Burmeister) (Isoptera,Hodotermitidae) als Schädling an Holzhäusern in Arabien nebst einer Liste,der bisher aus Arabien bekannten Termitenarten sowie einer Betrachtung der Verbreitung der paläarktischen Anacanthotermes-Arten

Zusammenfassung Es wird über Schäden an Holzhäusern und Bautätigkeit vonAnacanthotermes ochraceus (Burmeister) in Saudi-Arabien berichtet und die Verbreitung aller paläarktischenAnacanthotermes-Arten diskutiert. Es wird eine Liste aller bisher in Arabien festgestellten 15 Temitenarten gegeben, von denenMicrocerotermes gabrielis (Weidner) ersmalig genannt wird.

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Anacanthotermes ochraceus (Burmeister) (Isoptera, Hodotermitidae) as a pest on wood-houses in Arabia and a list of all termite species recorded hitherto from Arabia as well as a view of the distribution of palaearactic Anacanthotermes-species

The destructions on wood-houses and the building activities ofAnacanthotermes ochraceus (Burmeister) in Saudi-Arabia are recorded and the distribution of the palaearctic species ofAnacanthotermes is dicussed. A list of the 15 termite, species hitherto known from Arabia is also given.Microcerotermes gabrielis Weidner is new for this region.

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Mit 8 Abbildungen     

Effects of cortisol on growth and development in tilapia larvae,Oreochromis mossambicus

Treatment of one-day-old yolksac larvae of tilapia (Oreochromis mossambicus), by immersion in cortisol solution for two weeks, significantly enhanced growth. The standard length, tail length, head width and wet weight showed dose-dependent increases at concentrations of cortisol (hydrocortisone) from 0.05 ppm to 0.5 ppm, with no further increase at 1.0 ppm. However, cortisol at 5.0 ppm retarded the growth of the larvae without causing any morphological abnormality. Yolk absorption and the onset of free-swimming activity in the larvae were also accelerated by cortisol treatment.     

Impacts of Environmental Factors on Degradation of CrylAb Insecticidal Protein in Leaf-Blade Powders of Transgenic Bt Rice

The determination of the environmental fate of Bt insecticidal protein released by Bt rice plants in paddy soils is a key issue in its ecological risk assessment. In this study, the impacts of soil water content, pH, and temperature on the degradation of CrylAb protein expressed in the leaves of Bt rice KMD2 were studied in the laboratory. Three types of paddy soils were used, i.e., blue clayey paddy soil, pale paddy soil on quaternary red soil, and marine-fluvigenic yellow loamy paddy soil. Ground powders of KMD2 leaf blades were mixed with each type of soil, and degradation dynamics of Cry lAb were measured using enzyme-linked immunosorbent assay （ELISA）. The degradation rate of CrylAb was high at the early experimental stage, but slowed down steadily at middle and later stages, which could be described by exponential equations, with the half-life period of degradation determined as 1.8-4.0 d. The soil water content, pH, and temperature could affect the degradation of CrylAb, but the effects of soil pH and temperature were relatively greater. In general, CrylAb degradations were slower under lower soil pH and temperature conditions, especially for marine-fluvigenic yellow loamy paddy soil.