932 resultados para 925


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Im österreichischen Alpenanteil gibt es 925 Gletscher, die zusammen eine Fläche von 542 km**2 bedecken. Die Längenmessungen werden derzeit an 118 Gletschern mit einer Gesamtfläche von 310 km**2 durchgeführt, das sind 13 % der Anzahl und 57 % der Fläche aller österreichischen Gletscher. Diese ungleiche Verteilung kommt daher, weil das Beobachtungsnetz alle großen Talgletscher (>5 km**2) enthält, während die kleinen Kargletscher zu gering vertreten sind. Von den insgesamt 110 österreichischen Gletschern, die größer als 1 km**2 sind, werden die Längenänderungen an 75 Gletscherenden (=68 %) gemessen; von den 815 Gletschern, die weniger als 1 km**2 Fläche bedecken, liegen nur 44 (=5,4 %) im Beobachtungsnetz. Diese Tatsache muß bei der Interpretation von Ergebnissen der Längenmessungen und ihrer Wertung im Auge behalten werden. Im Berichtsjahr wurden von den ehrenamtlichen Mitarbeitern des Meßdienstes 16 Gebietsberichte mit 167 Seiten und 230 Fotos abgegeben, die im Gletschermeßarchiv des Österreichischen Alpenvereines aufbewahrt werden. Aus diesen Berichten wurde der vorliegende Sammelbericht zusammengestellt.

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A general study of structure, biomass estimates and dynamics on the macrofauna was carried out in August 1975 and March 1976 during PREFLEX (1975) and FLEX (1976), the Fladen Ground Experiment. On the basis of these data an attempt was made to estimate macrobenthic production expressed as minimum production (MP). The macrobenthic production is discussed together with meiobenthic annual production and with indirectly estimated microbenthic production in relation to an energy input from the water column of about 25 g C m**-2 year**-1. From the production estimates of the three benthic components a rough energy budget is proposed. Sampling was performed at five stations for endofauna twice during the time of investigation and for epifauna once. At each station two replicate box core samples (30 X 20 cm) were taken for endofauna. Epifauna was sampled with an Agassiz trawl once at each station. The total numbers of endofauna increased from station 1 to 5. This was valid as well for August 1975 (4,233-12,166 individuals per m**2 and 10 cm sediment depth) as for March 1976 (1,008-2,925 individuals). The polychaetes were the dominant organisms with a share of 33 to 62 %. The densities for the endofauna decreased from August 1975 to March 1976 by a mean factor of 2.8. Abundances of epifauna amounted to values between 11 and 102 individuals per 1000 m**2. The biomass dry weights (DWT) for macrobenthic endofauna varied between 0.97 g DWT m**-2 and 6.42 g DWT m**-2 in August 1975 and between 0.27 g DWT m**-2 and 2.64 g DWT m**-2 in March 1976. The mean amounted to 1.74 g DWT m**-2. Dry weights of epifauna biomass gave values between 4.9 and 83.1 g DWT * 1000 m**-2. The minimum production for the total macro-endofauna at Fladen Ground amounted to 1.43 g DWT m**-2 yr**-1 or 0.82 g C m**-2 yr**-1. This resulted in a minimum turnover rate (P/B) of 0.8. The share produced by the polychaetes amounted to 1.06g DWT m**-2 yr**-1 or 74 %.

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National Highway Traffic Safety Administration, Office of Crash Avoidance, Washington, D.C.

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Item 925

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Contiene: T. I (XIX, 925 p.) -- T. II (XII, 911 p.)

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"This fourth edition on Van Gelder paper consists of 925 copies."

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Microfilm.

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First edition under this title, in part the édition originale, according to Talvart et Place, 6:329, Vicaire, III, 925.

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Mode of access: Internet.

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Mode of access: Internet.