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  • 1
    Electronic Resource
    Electronic Resource
    Book Review (2004)
    Oxford, UK : Blackwell Science Ltd
    Aquaculture research 35 (2004), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.2004.01091.x
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  • 2
    Electronic Resource
    Electronic Resource
    Biomass assessment of estuarine macrophytobenthos using aerial photography (1986)
    Springer
    Marine biology 91 (1986), S. 331-335 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Traditional approaches for biomass assessment of estuarine macrophytes over vast areas are time consuming. A methodology for quick and accurate biomass estimation of macrophytes, growing at intertidal mudflats, has been developed and verified. Using a calculated relation between biomass and colour densities on the aerial photographs, biomass of macrophytes over a large area (ca 900 ha) could be assessed with an accuracy of about 10%. Biomass estimates could be partitioned over seagrasses, various green algae and brown algae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00428626
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  • 3
    Electronic Resource
    Electronic Resource
    Causes of the eelgrass wasting disease: Van der Werff's changing theories (1994)
    Springer
    Aquatic ecology 28 (1994), S. 55-61 
    Details
    ISSN: 1573-5125
    Keywords: wasting disease ; eelgrass ; Zostera marina ; Labyrinthula ; Chaetophoraceae ; Wadden Sea ; Grevelingen lagoon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The 1930's wasting disease among the North Atlantic population of eelgrass,Zostera marina, is still an ecological and historical enigma, despite several attractive theories. Van der Werff investigated the die-back of eelgrass in the thirties in the Dutch Wadden Sea, and he considered the micro-organismLabyrinthula as the possible cause of the disease. In 1980, Grevelingen lagoon, harbouring an extensive population ofZostera marina, experienced a major decline of the area covered by the submerged macrophyte. Speculations about the cause of this dramatic decline induced us to think that the wasting disease had struck again. Van der Werff investigated the Grevelingen population and found bothLabyrinthula and a Chaetophoracean endophytic alga to be presumably responsible for the decline. During the quest for the ultimate cause of the wasting disease the question remains whether both micro-organisms are the cause of the disease or simply an effect of decomposition processes triggered by other factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02334245
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  • 4
    Electronic Resource
    Electronic Resource
    Twentyfive years of changes in the distribution and biomass of eelgrass,Zostera marina, in Grevelingen lagoon, The Netherlands (1996)
    Springer
    Aquatic ecology 30 (1996), S. 107-117 
    Details
    ISSN: 1573-5125
    Keywords: marine lagoon ; eelgrass ; Zostera marina ; distribution patterns ; biomass changes ; long-term population changes ; environmental variables
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The wax and wane of the eelgrass (Zostera marina L.) population in Grevelingen lagoon (East Atlantic; The Netherlands) has been documented for over 25 years, together with quantitative and semi-quantitative data on environmental variables. The population expanded after the closure of the Grevelingen estuary in 1971, but declined from 4600 ha surface area in 1978 to less than 100 ha in 1993. There is little causal evidence which factors are responsible for the observed dynamics of the population. The incomplete picture emerging from the data is that of an extremely impoverished eelgrass population, living under constant oligo-mesotrophic marine conditions. Both the sexual and the vegetative modes of reproduction are severely stressed by environmental variables, most likely a combination of low temperatures, high salinity, low dissolved silicate and low ammonium concentrations. Survival of the population asks for the restoration of moderate estuarine conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02272232
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  • 5
    Electronic Resource
    Electronic Resource
    Reviews (1997)
    Springer
    Aquatic ecology 30 (1997), S. 339-348 
    Details
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02085877
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  • 6
    Electronic Resource
    Electronic Resource
    In memoriam Dr. K.F. Vaas (1980)
    Springer
    Aquatic ecology 14 (1980), S. 228-231 
    Details
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02260137
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  • 7
    Electronic Resource
    Electronic Resource
    Reviews (1992)
    Springer
    Aquatic ecology 25 (1992), S. 295-309 
    Details
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02270815
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  • 8
    Electronic Resource
    Electronic Resource
    Dynamics of benthic algal vegetation and environment in Dutch estuarine salt marshes studied by means of permanent quadrats (1978)
    Springer
    Plant ecology 38 (1978), S. 103-112 
    Details
    ISSN: 1573-5052
    Keywords: Netherlands ; Permanent quadrats ; Salt-marsh algae ; Salt-marsh environment ; Vegetation dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Knowledge of the spatial structure of benthic algal vegetations in salt marshes, consisting of about 100 species of blue-green, green, brown and red algae, formed the basis of a detailed study into the dynamics of the algal mat. The temporal changes in algal vegetations and concomitant processes in their environment were studied in 27 permanent quadrats (PQs), plotted in tidal salt marshes and along brackish inland waters in the SW Netherlands. Once a month vegetation and environment of the PQs were examined over the period March 1968-February 1971. From the Spearman rank-correlation between vegetational and environmental parameters it appeared that in semiterrestrial and terrestrial environments the average number of algal species in a relevé and the average similarity between the species composition of successive relevés obtained from one PQ have a significant positive correlation with the stability of the substrate, and hardly any correlation with fluetuations in soil-moisture content and salinity of the soil moisture and with the maximum cover percentage of the phanerogams. Stable substrates tend to bear stable algal mats, as appeared from quantitative data. Small and moderate fluctuations in soil-moisture content and salinity of the soil moisture have no limiting influence on the algal cover degree. During periods of extremely high salinity and concomitant extremely low soil-moisture contents that coincide with evaporation surpluses, the green algal mat bleaches and decreases in cover in semi-terrestrial and terrestrial environments. Below 20% the soil-moisture content is limiting for the expansion of a mat of green algae (Rhizoclonium riparium, Percursaria percursa, Enteromorpha torta, E. prolifera) and Vaucheria species. The mat desiceates and bleaches but recovers after increase of the soil-moisture content above 20% within one month. Two weeks of severe frost (temperature down to − 10°C) do not influence the cover degree of the algal mat in aquatic branckish PQs, but the cover degree in semi-terrestrial PQs decreases. Short lasting soil-moisture salinities of 130–190 ‰ Cl− have no limiting effect on the expansion of the algal mat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00052041
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  • 9
    Electronic Resource
    Electronic Resource
    Salt-marsh and beach plain as a habitat for benthic algae (1973)
    Springer
    Aquatic ecology 7 (1973), S. 15-24 
    Details
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279916
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  • 10
    Electronic Resource
    Electronic Resource
    Lake grevelingen: A case study of ecosystem changes in a closed estuary (1978)
    Springer
    Aquatic ecology 12 (1978), S. 246-259 
    Details
    ISSN: 1573-5125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. Grevelingen estuary, formerly in open connection with the rivers Rhine and Meuse and with the North Sea, was closed by a dam in May 1971, excluding influences both from the rivers and from the sea (tides dropped out); brackish Lake Grevelingen originated. 2. A number of changes took place in the environment, on species level, on community level and on ecosystem level. 3. Changes on species level. The life cycles of certain species were blocked, because their food disappeared, the particle size spectrum of the food changed, or their migration routes were blocked. It was found that (1) species richness decreased; (2) shifts in numbers per species took place; (3) species with broad ecological tolerance remained; (4) brackish water species appeared. 4. Changes on community level. Structural aspects: (a) habitats disappeared; (b) pattern diversity decreased; (c) habitat-bound species disappeared. Functional aspects (trophic relations): (a) the energy subsidy from the North Sea was blocked; (b) the amount of organic matter decreased; (c) the production of some primary consumer groups decreased (d) tertiary and some secondary consumers disappeared; (e) the food chains shortened. 5. Changes on ecosystem level. The overall ecosystem simplified, both in structure and in functioning. The impact of the shallow macrophyte dominated subsystem increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259186
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