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  • encrusting community  (1)
  • recruitment  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    A ‘minimum stress inflexion’ in relation to environmental and biotic influences on the dynamics of subtidal encrusting communities? (2000)
    Springer
    Hydrobiologia 440 (2000), S. 101-109 
    Details
    ISSN: 1573-5117
    Keywords: encrusting community ; competition ; disturbance ; sediment ; stress ; diversity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The sedentary fauna of sublittoral boulders was studied at five sites with very different environmental conditions within Lough Hyne Marine Nature Reserve (51° 30′ N, 9° 18′ W). The degree of competition was assessed through the construction of competitive hierarchies built up from the results of nearly 3000 interactions between organisms. Communities at all sites were predominantly hierarchically organised with few stand-offs recorded. Density of interactions was correlated with total space occupation. Flow speed at all sites was logged over 24 h and this factor also correlated with space occupation. Degree of disturbance was assessed through the use of marked boulders at each site. Species diversity peaked where all factors were ‘moderate’ and was lowest at ‘extreme’ sites. The effects of these environmental variables and biotic factors in determining community composition are discussed, and a working model detailing a ‘Minimum Stress Inflexion’ is described. This represents an extension of the intermediate disturbance hypothesis in that it is proposed that disturbance in this system may serve to reduce sediment load as opposed to preventing space monopolisation in the classical model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004134103670
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Diversity, recruitment and competition on island shores at south-polar localities compared with lower latitudes: encrusting community examples (2000)
    Springer
    Hydrobiologia 440 (2000), S. 37-44 
    Details
    ISSN: 1573-5117
    Keywords: diversity ; recruitment ; spatial competition ; intertidal ; south-polar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Comparisons of temperate and tropical shores have yielded considerable debate as to whether the former really are less benign, diverse and structured by different ecological processes. Studies of comparable boulder communities have shown high within region variability. Equivalent polar assemblages, from island shores compared here, show much reduced within region variability and considerably reduced numbers of phyla and species encrusting boulders. The rate of colonisation (compared from settlement panel studies) was an order of magnitude higher in warmer water, but did vary with isolation (near vs offshore islands). Comparison of the most ubiquitous taxon, the bryozoans, between polar and non polar sites shows a decrease in the proportion of inter-specific competition, indeterminate competitor (species) pairs and incidence of tied outcomes in competition. These three parameters all increased with depth at the localities studied, whilst no obvious influence of isolation was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004132608697
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
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