摘要:

AbstractIn specimens of the hermatypic coral speciesFungia scutariaandMontipora verrucosaand in the algaUlva lactuca, nitrate uptake was measured in light and dark with a flow‐through apparatus. The nitrate uptake was measurable in high‐nitrate bay water of Kaneohe Bay and also in low‐nitrate open ocean water. Nitrate consumption rates by the corals and the alga did not differ from light to dark.Neither the coral nor the alga showed measurable immediate nitrate uptake in open ocean water of low nitrate concentration when they had been held previously in the high‐nitrate bay water. In low‐nitrate open ocean water the uptake per unit time increases when the flow of the water increases.The uptake of nitrate by reef corals even from low concentrations indicates nonspecific nutrient sources for re

ISSN:0020-9309    

DOI:10.1002/iroh.19740590102

出版商:Akademie Verlag, Berlin    

年代:1974

数据来源: WILEY

摘要:

Abstract75% of the isolated strains were Gram negative, asporogenous bacteria. Almost a half of them fermented glucose, which was probably caused by a selectivity of the agar medium for the particular types. The groups tentatively classified as Enterobacteriaceae andAeromonas, prevailed during summer, whereas pseudomonads andAcinetobacterwere more common in winter.

ISSN:0020-9309    

DOI:10.1002/iroh.19740590103

出版商:Akademie Verlag, Berlin    

年代:1974

数据来源: WILEY

摘要:

Investigations on the CO2Balance of Submerged Water Plants in Running Water By Means of a Motile Laboratory for Infrared Gas AnalysisThe CO2‐balance of the submerged water mossesHygrohypnum ochraceumf.obtusifolia, Amblystegium riparium, Amblystegium ripariumf.fontinaloidesand ofPotamogeton trichoides(Potamogetonaceae) was investigated by means of a transportable laboratory for infrared gas analysis. The experiments were carried out in the river Zwickauer Mulde by means of glass vessels exposed to the water body. The device for continuous measuring CO2exchange was operated by pumping air through the vessels containing 4 l of water. The water plants exhibited a distinct day night rhythm of CO2turnover. In some cases river water alone, which had percolated a tampon of Perlon fibres, also showed a considerable day night rhythm of CO2turnover which had to be attributed to phytoplankton and suspended periphyton organisms, the activity of which is superimposed above the photosynthetic activity of the macrophytes. Measurement of the CO2balance of submerged plants in water containing microphytes can only be attributable to the macrophytes if the time of exposition does not exceed one da

ISSN:0020-9309    

DOI:10.1002/iroh.19740590104

出版商:Akademie Verlag, Berlin    

年代:1974

数据来源: WILEY

摘要:

AbstractA quantitative study is made of the feeding ofParamecium caudatumon bacteria and of the feeding ofDaphnia pulexonParameciumand bacteria. The growth yield ofP. caudatumon a diet of an unidentified yellow‐colored bacterium was about 55% on a dry weight basis.Parameciumwould not grow if the concentration of bacteria is less than 1 . 107cells ml. Several other bacterial species were tested.Parameciumcould not grow successfully on all of them, but could onRhodopseudomonas spheroides.Adults of Daphnia pulex could grow and reproduce on a diet ofP. caudatumalone, but young grew successfully only when bacteria were presen

ISSN:0020-9309    

DOI:10.1002/iroh.19740590105

出版商:Akademie Verlag, Berlin    

年代:1974

数据来源: WILEY

摘要:

AbstractThe aerobic decomposition of freshwater phytoplankton was monitored over a 10 day period to determine rates of production and microbial utilization of total dissolved organic carbon and dissolved carbohydrates. Following molecular weight fractionation of the total dissolved organic and carbohydrate carbon produced, it was found that each component contained a highly labile as well as a partially refractory fraction. Specific decomposition rate constants were determined for both fractions. Molecular weight retention characteristics of the ultrafilter used were also evaluated.

ISSN:0020-9309    

DOI:10.1002/iroh.19740590106

出版商:Akademie Verlag, Berlin    

年代:1974

数据来源: WILEY

摘要:

AbstractSpecimens of the lumbriculid genusStyloscolexMICHAELSEN have been found in northern Alaska. They were identified asSt. opisthothecusSOKOLSKAJA 1969, known from Kamchatka. A description of the Alaskan specimens and habitats is given. The genusStyloscolexonce supposed to be a Baikalian endemic has representatives also in Manchukuo and Japan. It is pointed to the fact that bottom‐living organisms of lakes of vast areas are rather unknown. Only Lake Baikal, famous for its size and depth, has attracted special interest and been thoroughly investigated. The genusStyloscolexmay thus be found in more areas. In any case, the present finds show that it is not restricted to eastern Asi

ISSN:0020-9309    

DOI:10.1002/iroh.19740590107

出版商:Akademie Verlag, Berlin    

年代:1974

数据来源: WILEY

摘要:

AbstractThree species of monstrilloids were collected in the plankton beneath the ice in December at Resolute Bay, Cornwallis Island in the Canadian Arctic. The species are determined asMonstrilla arctican. sp.,M. nasutan. sp. andM. bernardensis(WILLEY, 1920). They are described and figured in detail.

ISSN:0020-9309    

DOI:10.1002/iroh.19740590108

出版商:Akademie Verlag, Berlin    

年代:1974

数据来源: WILEY

摘要:

Abstract12C/13C ratio is used as natural tracer for the estimation of the mineralizing activity of pelagic bacteria.Attention is particularly given to the variations of the isotopic ratio of the inorganic carbon produced by the microbial oxidation in comparison with the ratio of the dissolved organic matter.

ISSN:0020-9309    

DOI:10.1002/iroh.19740590109

出版商:Akademie Verlag, Berlin    

年代:1974

数据来源: WILEY

摘要:

AbstractA numerial assessment is proposed for various types of both bacteria and fungi, relying on 10 plates. Photographs show how to make use of the plates. A formula is given, by the help of which the marks obtained are gathered within a single value, the latter being a synthesis of the morphological and functional state of bacteria and fungi in the considered treatment plant.

ISSN:0020-9309    

DOI:10.1002/iroh.19740590110

出版商:Akademie Verlag, Berlin    

年代:1974

数据来源: WILEY

摘要:

AbstractInvestigations have been carried regarding carotenoids and vitamin A in the crabsPachygrapsus marmoratus(FABRE) andEriphia spinifrons(HERBST) from the Black and Adriatic Sea. The presence of carotenoids and vitamin A was determined by means of column and thinlayer chromatography.The following carotenoids were found:Pachygrapsus marmoratus:β‐carotene, cryptoxanthin, canthaxanthin, lutein, astaxanthin and vitamin A;Eriphia spinifrons:β‐carotene, echinenone, canthaxanthin, isozeaxanthin, zeaxanthin, lutein (ester and epoxy), astaxanthin and ast

ISSN:0020-9309    

DOI:10.1002/iroh.19740590111

出版商:Akademie Verlag, Berlin    

年代:1974

数据来源: WILEY