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Although the Namib Desert is classified as hyperarid, with rainfall extremely rare, there are several other sources of atmospheric moisture, namely, humidity, dew and fog, which make it possible for organisms to live there. Methods to use these sources include locating moist micro-climates, drinking from wet surfaces, consuming moist food, collecting water on the body, and absorbing water vapour. In describing these mechanisms from published sources, we highlight the work of Professor Gideon Louw, to whom we dedicate this paper. Louw's pioneering work on water relations and economy, which includes osmoregulation in desert plants and animals such as grass, beetles, and springbok, established a foundation that inspired numerous studies by colleagues and students. Ecophysiology provides many more lessons that have potential to be mimicked and applied in the occult collection of water in arid regions. 相似文献
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Joh Koenigsberger 《International Journal of Earth Sciences》1910,1(6):241-249
Ohne Zusammenfassung
Die wichtigsten übrigen Berechnungsarten sollen in einem Referat von W.Salomon besprochen werden. 相似文献
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Joh -Heinrich Hellmers 《International Journal of Earth Sciences》1955,44(1):87-92
Zusammenfassung Die tektonische Verformung der Krinoidenstiel-Basisflächen wird in zwei Teilgebieten des Rheinischen Schiefergebirges, an der unteren Lahn und im Bergischen Lande messend verfolgt und statistisch ausgewertet. Im ersteren Gebiete fügt sich die Auslängung dem Faltenstreichen ein, im zweiten ist die Deformation unabhängig und offenbar älter als die Faltung.Auszug aus der Dissertation gleichen Titels mit einigen Zusätzen von R. Brinkmann. 相似文献
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Joh Sölch 《International Journal of Earth Sciences》1919,9(7-8):161-177
Ohne Zusammenfassung 相似文献
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Mud samples were collected from the eastern coast of Osaka Bay from April 1984 to August 1985 and were incubated atin situ mud temperatures to examine the effects of temperature on the liberation of seven species of red-tide algae.
Skeletonema costatum appeared extensively over a wide temperature range of 9–25°C. The percentage of liberation of benthicHeterosigma akashiwo cells tended to decrease with decreasing temperature, but this species also showed high percentages of liberation (40–100 %) in April whenin situ mud temperatures were still low (9.5–10°C). Germination of benthicHeterocapsa triquetra cells was active at temperatures lower than 10°C but was inhibited to below 20% at temperatures higher than 21°C. This indicates that the supply of vegetativeHeterocapsa cells from bottom muds to seawaters becomes inactive from summer to early autumn. The optimum temperature range for the liberation of benthicChattonella sp. cells was 16–21°C. ForProrocentrum micans, Prorocentrum minimum, andProrocentrum triestinum, no vegetative cells were released from bottom mud at any of the temperatures examined (9–25°C).Field observations on the population dynamics of vegetative cells conducted from April to September 1984 revealed that a close link exists between liberation ofS. costatum andH. triquetra and their blooms in the waters of Osaka Bay. On the basis of these findings, the ecological role of benthic cells in initiating red tides in Osaka Bay is discussed. 相似文献
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Joh R. Henschel 《Journal of Arid Environments》1997,37(4):695-707
A community of psammophilous spiders was studied in the central Namib Desert. Of 20 species, 85% were cursorial. Complex setae, claws or keels facilitate digging, sweeping, carrying, and swimming in or walking on sand, while long spigots enable spiders to bind sand with silk when burrowing down to depths with amenable microclimate (10–120 cm). Sand is excavated either by sweeping it up an incline or carrying it vertically up. Other characteristics of dune spiders were large size, polyphagy, low metabolism, longevity, brood care and seasonal foraging and breeding patterns. The large, dominant heteropodid,Leucorchestris, may determine many characteristics of the Namib arthropod community. 相似文献
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Joh Koenigsberger 《International Journal of Earth Sciences》1913,4(7):409-413
Ohne Zusammenfassung 相似文献