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  • Grazing  (1)
  • benthic animals  (1)
  • intertidal  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Effects of gastropod grazers on recruitment and succession of an estuarine assemblage: a multivariate and univariate approach (1997)
    Springer
    Oecologia 109 (1997), S. 442-453 
    Details
    ISSN: 1432-1939
    Keywords: Key words Assemblage structure ; Gastropods ; Grazing ; Oysters ; Multivariate effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Grazers have been shown to affect assemblages of species in many habitats. Here we studied the effects of the gastropod grazers, Austrocochlea porcata and Bembicium auratum, on intertidal estuarine assemblages in a sheltered bay in New South Wales, Australia. We examined the effects of gastropods on individual species and on the assemblage as a whole. The multivariate response was compared with data on succession in these assemblages to estimate potential effects of grazers on succession. The experiment was repeated several times to determine the generality of grazer effects in the light of possible variation in the timing or intensity of recruitment. There were different responses of individual species to the presence of grazers. Grazers reduced the abundance of ephemeral algal species, bryozoans, copepods, insect larvae and Balanus spp. barnacles. They had a positive effect on oysters and spirorbids and no effect on the barnacles Elminius covertus and Hexaminius spp. These effects were consistent through time. Multivariate analyses confirmed that grazers caused significant changes to whole assemblages and that these effects were far-reaching and not only caused by changes to algal species. The removal of grazers appeared to neither speed up nor slow down succession, but rather caused a completely different assemblage to develop. Apparent important mechanisms affecting the composition of animal species when grazers were removed included accumulation of sediments and detritus and pre-emption of space by algae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050104
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ecology of marine algae on rocky shores and subtidal reefs in temperate Australia (1990)
    Springer
    Hydrobiologia 192 (1990), S. 3-20 
    Details
    ISSN: 1573-5117
    Keywords: algal assemblages ; Australia ; intertidal ; rocky habitats ; subtidal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Experiments in intertidal and subtidal rocky marine habitats in temperate Australia have identified the effects of various biological and physical factors on algal assemblages. In intertidal habitats, these involve micro- and macro-algae and grazing by gastropods. In subtidal habitats, interactions among micro- and macro-algae, echinoids, gastropods, micro-invertebrates and sessile invertebrates have been studied. Experimental studies on physical disturbances of algal assemblages have focussed on the effects of desiccation and storms. Most studies have not considered more than one spatial or temporal scale. Few have been concerned with seasonal influences and fewer have been concerned with variation from year to year. Most of the work lacks applicability to biogeographic comparisons. More experimental work across a variety of spatial and temporal scales is required to determine significant biological and physical processes affecting structure of algal assemblages across broad areas of temperate Australia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006224
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Technical Note: Using an Experimental Manipulation of Contaminants in Intertidal Sediments (1999)
    Springer
    Ecotoxicology 8 (1999), S. 495-501 
    Details
    ISSN: 1573-3017
    Keywords: manipulative experiment ; heavy metal ; pollution ; soft-sediment ; benthic animals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Manipulative experiments in the field are important tools, for improving understanding of disturbances, such as contaminants, causing environmental impacts. We tested a method to create patches of increased concentrations of metals in intertidal sediments. The method produced persistent concentrations of metals, which were as large as those observed in contaminated areas and it appears to be applicable in different habitats. The utility of this technique as a tool to improve predictions about environmental effects needs to be evaluated by repeated experimentation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008976324070
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    Paper (German National Licenses)
    Fulltext
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