Analysis of prey size preference of North Sea whiting, saithe, and grey gurnard   总被引：2，自引：0，他引：2  

Floeter  Jens; Temming  Axel 《ICES Journal of Marine Science》2005,62(5):897-907

  相似文献   

Bücher- und Zeitschriftenschau     

Bubnoff  Wilckens  Axel Born 《International Journal of Earth Sciences》1931,22(5):340-351

Ohne Zusammenfassung  相似文献   

Formation of sequences of cemented layers and hardpans within sulfide-bearing mine tailings (mine district Freiberg,Germany)     

Torsten Graupner  Andrea Kassahun  Dieter Rammlmair  Jeannet A. Meima  Dagmar Kock  Markus Furche  Adrian Fiege  Axel Schippers  Frank Melcher 《Applied Geochemistry》2007

  相似文献   

Reproductive characteristics of invasive gammarids in the Rhine-Main-Danube catchment, South Germany     

Axel Kley  Gerhard Maier   《Limnologica》2006,36(2):79-90

The gammarid composition at 25 sites in the rivers Danube, Main and the southern reaches of the Rhine were studied during the years 2002–2004. Dikerogammarus villosus and Echinogammarus ischnus were the most frequent species prevailing at 17 sites. Sympatric occurrence of D. villosus and E. ischnus was observed at 12 sites. Dikerogammarus haemobaphes was recorded at 7 sites; this species prevailed in the Danube, west of the Weltenburger Enge and in the Isar mouth where it co-existed with native species (Gammarus pulex and/or G. roeseli) at 6 sites. Dikerogammarus bispinosus and E. berilloni were found at only 1 site, where they co-existed with D. villosus and E. ischnus, and with D. villosus and native species, respectively. Investigation of reproductive characteristics at 3 sites showed that females of D. villosus and D. haemobaphes produced the biggest clutches with more than 100 eggs. Females of E. ischnus produced much smaller clutches (10–35 eggs on an average), but very big eggs. Clutch sizes and egg volumes of D. bispinosus and E. berilloni resembled those of native species. Our results suggest that the most successful invaders (D. villosus, D. haemobaphes and E. ischnus) display reproductive traits that facilitate their success. Both Dikerogammarus sp. allocate energy into production of many but small eggs, thus maximizing offspring number, while E. ischnus allocates its energy into production of fewer but large eggs which could be beneficial at sites where food is scarce.  相似文献   

Climatic change on the Tibetan Plateau: Potential Evapotranspiration Trends from 1961–2000     

Chen Shenbin  Liu Yunfeng  Axel Thomas 《Climatic change》2006,76(3-4):291-319

Time series (1961–2000) of Penman-Monteith potential evapotranspiration estimates for 101 stations on the Tibetan Plateau and surrounding areas are analyzed in this paper. For the Tibetan Plateau as a whole potential evapotranspiration (PET) has decreased in all seasons. The average annual evapotranspiration rate decreased by 13.1 mm/decade or 2.0% of the annual total. Superimposed on this general decline are fluctuations ranging from app. 600 to 700 mm with above average rates in the 1970s and 1980s. On a regional basis, spatial trend distributions remain stable throughout the year with similar seasonal variations. Decreasing PET rates are more pronounced in winter and spring (80% of all stations) as compared to summer and autumn (58% of all stations). Maximum negative (positive) annual rates were recorded at two stations in the southern Qaidam Basin with –79.5 mm/decade (84.8 mm/decade) even though in general negative rates tend to be noticeably higher than positive rates.Changes in wind speed and to a lesser degree relative humidity were found to be the most important meteorological variables affecting PET trends on the Tibetan Plateau while changes in sunshine duration played an insignificant role. Stable daytime temperatures on the Tibetan Plateau have limited the importance of temperature trends for changes of PET rates. Negative evapotranspiration trends are therefore thought to be linked to a general decrease in intensity of the regional monsoon circulation rather than to reductions in sunshine duration. Reduced PET rates appear to be in contrast to a predicted increased hydrological cycle under global warming scenarios.  相似文献   

Climate Change in the Mediterranean     

Axel Michaelowa 《Climatic change》2006,75(4):513-515

  相似文献   

Editorial     

Axel Michaelowa 《Climate Policy》2003,3(1):1

  相似文献   

Instruments for Climate Policy: Limited Versus Unlimited Flexibility: Albrecht Johan (Ed.), Edward Elgar, Cheltenham, 2002, 286 pp., £69.95, ISBN 1-84064-759-0     

Axel Michaelowa 《Climate Policy》2003,3(3):322-325

  相似文献   

Coalbed methane in the Ruhr Basin, Germany: a renewable energy resource?   总被引：1，自引：0，他引：1  

Thomas Thielemann  Bernhard Cramer  Axel Schippers 《Organic Geochemistry》2004,35(11-12):1537

Around the globe underground hard coal mining leads to a release of methane into the atmosphere. About 7% of the global annual methane emissions originate from coal mining. In the year 2002, 16 countries used coal gas to generate heat and electricity. In many cases, the exact size of coalbed methane reservoirs is not identified. The possibility of a long-term gas production and its profitability at single sites are unknown. To clarify these points, the processes of gas generation as well as the gas-in-place volume have to be determined. Both issues are tackled here for the Ruhr basin. Within this basin, coal gas samples were taken at 13 gas production sites, spread over three samplings within 14 months. There were virtually no changes in the concentrations of gas components at single sites within this period. The isotope composition of methane (δ¹³C-methane: −40.0 to −57.3‰ vs. PDB) revealed that the produced methane is a mixture of gases of thermogenic and microbial origin. The microbial contribution of methane seems to be more pronounced at sites of active and especially abandoned coal mining than at unmined places. Ethane and propane are of thermogenic origin, with ethane's isotopic composition tending to heavier values (richer in ¹³C) with time. This time-dependent phenomenon is interpreted as being caused by desorption. In addition, living methanogenic archaea were detected in mine water samples from depths down to 1200 m.  相似文献   

Infra-red radiometry in the German Bight     

Dipl.-Oz. Gerd Axel Becker  Dr. Klaus Huber  Dipl.-Oz. Hans Krause 《Ocean Dynamics》1979,32(1):19-26

  相似文献