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  • 2000-2004  (4)
  • 1995-1999  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Bryozoan colonization of the marine isopod Glyptonotus antarcticus at Signy Island, Antarctica (1999)
    Springer
    Polar biology 21 (1999), S. 48-55 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sixty specimens of the giant marine isopod Glyptonotus antarcticus Eights, collected from Borge Bay, Signy Island, Antarctica were examined for epizoans. Ten species of cheilostomatid bryozoans were found on the isopods. The purpose of the study was to quantify the prevalence, intensity, abundance, and spatial distribution of the bryozoans on the isopods. The proportion of isopods colonized was 42%. The larger isopods had both significantly more epizoic bryozoan colonies and species. The greatest density of bryozoans was on the fused pleon and telson. There was no significant difference between the dorsal and ventral abundance of bryozoan colonies. The diversity of epizoic bryozoans on the isopods is higher than on other host organisms from more stable environments. This may be because of active selection by settling larvae. The frequency of local substrata being scoured by ice is high around Signy Island, so there may be a selective advantage in colonizing a motile host.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050331
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Seasonality of feeding activity in Antarctic suspension feeders (1995)
    Springer
    Polar biology 15 (1995), S. 335-340 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The feeding activity of four benthic suspension-feeding groups (bryozoans, hydroids, polychaetes and holothurians) was monitored in situ every month for a 2-year period at Signy Island in the maritime Antarctic. The bryozoans were monitored at species level, whereas the other taxa could be differentiated only to genus. A marked seasonal variation in feeding activity was observed in most taxa. Although environmental parameters such as sea water temperature, fastice duration and water column chlorophyll concentrations suggested that winter in the maritime Antarctic lasts for about 6 months, many animals ceased feeding only for a short period of 2 or 3 months around the middle of the austral winter (June/July). These suspension feeders must therefore be efficient at utilising the low concentration of the microplankton existing in the water column for much of the year. Comparison with environmental variables suggested several possible cues for changes in feeding activity, but these cues may differ between taxa. Photoperiod and changes in disturbance by water movement (both mediated by ice), and food concentration are likely to be important environmental cues for polar suspension feeders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238483
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Resource availability Ancient homes for hard-up hermit crabs (2001)
    [s.l.] : Nature Publishing Group
    Nature 412 (2001), S. 785-786 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Mollusc shells are a vital but sometimes scarce resource for hermit crabs, protecting them from mechanical damage and desiccation, but they require continual replacement as the crab grows. I have discovered that Coenobita rugosus, a large, tropical, semi-terrestrial hermit crab, will resort to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35090632
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Biodiversity Invasions by marine life on plastic debris (2002)
    [s.l.] : Nature Publishing Group
    Nature 416 (2002), S. 808-809 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Colonization by alien species poses one of the greatest threats to global biodiversity. Here I investigate the colonization by marine organisms of drift debris deposited on the shores of 30 remote islands from the Arctic to the Antarctic (across all oceans) and find that human litter more than ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/416808a
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    Paper (German National Licenses)
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  • 5
    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
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  • 6
    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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