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  • 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
    Scales of spatial patterns of distribution of intertidal invertebrates (1996)
    Springer
    Oecologia 107 (1996), S. 212-224 
    Details
    ISSN: 1432-1939
    Keywords: Fractal ; Intertidal ; Scale ; Spatial pattern ; Variance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Few comparative studies of spatial patterns at different scales have examined several species in the same habitat or the same species over a range of habitats. Therefore, variability in patterns among species or among habitats has seldom been documented. This study quantifies spatial patterns of a suite of intertidal snails and a species of barnacle using a range of statistical techniques. Variability in densities was quantified from the scale of adjacent quadrats (over a distance of centimeters) to tens of kilometers. Significant differences in abundances occurred primarily at two spatial scales. Small-scale differences were found at the scales of centimeters or 1–2 m and, for many species on many shores, these accounted for most of the variability in abundances from place to place. These are likely to be determined by behavioural responses to small-scale patches of microhabitat. Large-scale differences in abundance were also found in most species at the scale of hundreds of meters alongshore. These are likely to be due to variation in recruitment (and/or mortality) because of limited dispersal by adults of these species. There was little or no additional variation among shores, separated by tens of kilometers, than was shown among patches of shore separated by hundreds of meters. Identification of the scale(s) at which significant differences in abundance are found focus attention on the processes (and the scales at which these processes operate) that influence patterns of distribution and abundance. Some of the advantages and disadvantages of various procedures are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327905
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    Paper (German National Licenses)
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  • 3
    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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