摘要:

AbstractThe background and the aims of the Finnish IBP‐PM programme are discussed. The research programme is outlined, with special reference to the study of the littoral communities. The research areas (Tvärminne, 59°50′N, 23°15′N and Krunnit, 65°25′N, 24°50′E) are briefly described. The sampling programme, the sampling methods, the treatment of the samples and the gross structure of the collected material

ISSN:0020-9309    

DOI:10.1002/iroh.19750600301

出版商:Akademie Verlag, Berlin    

年代:1975

数据来源: WILEY

摘要:

AbstractWeight determinations have been made by standard methods, for the species of the common, littoral macrofauna of the Tvärminne area, S Finland. Equations are provided, for species or higher taxa, for the prediction of dry weight from wet weight, and of ash‐free dry weight from dry weight, applying the ratio model, the linear model and the curvilinear model. Factors affecting the weight estimates, including preservation in formalin, and some factors affecting the interrelationships of the weights have been discuss

ISSN:0020-9309    

DOI:10.1002/iroh.19750600302

出版商:Akademie Verlag, Berlin    

年代:1975

数据来源: WILEY

摘要:

AbstractThe community composition was studied quantitatively in two localities in 1968‐1970. The average ash‐free dry weights of the plants in a fully exposed and a moderately exposed locality were 48.6 g. m−2and 93.3 g. m−2, respectively. The average animal ash‐free dry weights were 2.52 g. m−2and 3.45 g. m−2. and the average numbers of animal individuals were 5360 m−2and 15450. m−2.The communities are characterized by the strong dominance of a few species. viz.Cladophora glomerata. Gammarusspp. and Chironomid larvae. The species diversity is thus very low. The seasonal aspects of species composition and abundance are presented. and some factors causing the differences between the localit

ISSN:0020-9309    

DOI:10.1002/iroh.19750600303

出版商:Akademie Verlag, Berlin    

年代:1975

数据来源: WILEY

摘要:

AbstractData are presented on the particulate and dissolved organic carbon at Eniwetok Atoll in the Pacific and of particulate organic carbon at South Caicos in the Caribbean. Some data from other locales are included for comparison. Proportionate increases are greater for the particulate matter released from off reefs than for the dissolved; in fact, the net flux of dissolved matter is sometimes negative.Particulate matter, in this case of the size and kinds retained on micro‐filters, is dominated by fragments and amorphous material of mixed origins. Phytoplankton is sparse in such environment

ISSN:0020-9309    

DOI:10.1002/iroh.19750600304

出版商:Akademie Verlag, Berlin    

年代:1975

数据来源: WILEY

摘要:

AbstractApproximately one‐third of organic seston in western Lake Erie was estimated to be living algae; the remainder was mainly detritus. The amount of detrital carbon was least in summer and maximal in autumn. Allochthonous organic matter, particularly municipal and industrial wastes, and resuspended sediments were considered to be major sources of detritu

ISSN:0020-9309    

DOI:10.1002/iroh.19750600305

出版商:Akademie Verlag, Berlin    

年代:1975

数据来源: WILEY

摘要:

AbstractIn the areas studied, an unusual structure and dynamic behavior was exhibited by the plankton ecosystems, due for the most part to industrial and natural effluents from the Rhǒne and Durance. The ecosystem was kept at a low state of maturity, which is characterized by frequent periods of intense multiplication by small species with high metabolic rates, such as the diatom,Skeletonema costatum, and the dinoflagellates,ExuviaellaandProrocentrum. Brackish water seems congenial to that type of proliferation.The turnover rate of these populations decreases as they become older and cell size increases. A lack of competition by species of the same genus is a characteristic of the photo‐autotrophic organisms in these environments. Secondary production follows the same cycle as the primary production by the dinoflagellate population. Zooplankton species of the genusAcartiahave periods of intensive development in these are

ISSN:0020-9309    

DOI:10.1002/iroh.19750600306

出版商:Akademie Verlag, Berlin    

年代:1975

数据来源: WILEY

摘要:

AbstractA comparative study in 1969‐1970 of the phytoplankton and certain other parameters in St. John's Harbour and Aquaforte Harbour, located on the southeast coast of Newfoundland, led to the conclusion that St. John's Harbour which receives untreated sewage as a prime source of nutrients was by far the more eutrophic. Evidence for the eutrophic state was especially observed in the central basin (Station 1) of the harbour. Here the bottom waters were deficient in oxygen especially during the summer months. Secchi disc readings were generally lower at this station, and the annual standing crop of phytoplankton was almost three times that at unpolluted Aquaforte Harbour. Also the proportion of the biomass contributed by the nannoplankton was greater in St. John's Harbour. One euglenoid occurred in bloom concentrations throughout the summer months and may possibly be considered as an indicator of organically‐polluted wat

ISSN:0020-9309    

DOI:10.1002/iroh.19750600307

出版商:Akademie Verlag, Berlin    

年代:1975

数据来源: WILEY

摘要:

AbstractThe available information on the distribution of nematodes does not demonstrate a significant latitudinal difference in the numbers of marine species colonizing freshwaters. This result contrasts with the often‐stated comparative richness of marine elements in tropical freshwaters, as established by macrofauna observations. Because of this discrepancy the arguments explaining the abundance of marine elements in tropical freshwaters are reconsidered in physiological, statistical and historical perspectiv

ISSN:0020-9309    

DOI:10.1002/iroh.19750600308

出版商:Akademie Verlag, Berlin    

年代:1975

数据来源: WILEY

摘要:

AbstractSamples of phytoplankton were taken from the Euphrat and Tigris Estuary (Shatt al‐Arab) in April 1974 and investigated by means of the inverted microscope. Among 226 species identified in the samples 95 were of marine origin. The share of diatoms in the total numbers of cells from all stations amounted to 68%. The abundance of planktonic green algae amounted to 19%, of the blue greens to 13%. The number of marine species continuously increased in the longitudinal axis of the 139 km section considered. The data of the phytoplankton were compared with the gradation of some environmental variables (temperature, transparency, dissolved oxygen, chloride). Regular longitudinal or vertical differences of these parameters were not observe

ISSN:0020-9309    

DOI:10.1002/iroh.19750600309

出版商:Akademie Verlag, Berlin    

年代:1975

数据来源: WILEY

ISSN:0020-9309    

DOI:10.1002/iroh.19750600310

出版商:Akademie Verlag, Berlin    

年代:1975

数据来源: WILEY