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  • 1
    Electronic Resource
    Electronic Resource
    Carbon-dioxide production and metabolic parameters in the ophiurid Ophiothrix fragilis (1997)
    Springer
    Marine biology 127 (1997), S. 699-704 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract As part of the evaluation of fluxes between the water column and a rich benthic community of the Dover Strait (Eastern English Channel), laboratory measurements of oxygen consumption were carried out on a common ophiurid, Ophiothrix fragilis (Abildgaard), from February 1993 to February 1995. The mean O2-consumption rate was evaluated at 0.31 mg O2 g−1 h−1 (ash-free dry weight). Simultaneous measurements of O2 consumption and CO2 production using the pH-alkalinity method revealed an average respiratory quotient of 0.69 proved suitable for converting oxygen demand to carbon flux. A seasonal trend in respiration data was demonstrated by sinusoidal curves fitted to O2-uptake and CO2-release data as a function of time. The influence on respiration rate of two seasonal parameters (temperature and food availability) is discussed; linear regression indicated a highly significant relationship between O2 consumption (or CO2 production) and temperature; both O2-consumption and CO2-production rates decreased with starvation. The average O:N ratio was estimated at 8.46, close to the theoretical value when proteins constitute the catabolic substrate. The annual carbon respired by the O. fragilis community examined and the estimated annual primary production by phytoplankton indicate that the respiration of the O. fragilis community could supply 35% of phytoplankton carbon requirements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050060
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Multi-scale heterogeneity in a macrobenthic epifauna community (1995)
    Springer
    Hydrobiologia 300-301 (1995), S. 375-381 
    Details
    ISSN: 1573-5117
    Keywords: benthos ; multi-scale heterogeneity ; biomass ; scuba diving ; sampling strategy ; suspension-feeders
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A quantitative study, based on monthly samples taken by divers with 0.1m2 quadrats, was conducted on a benthic community settling coarse sediments in an area exposed to strong water currents. The richness of the community was high both in terms of biomass (270±107 g m−2 in ash-free dry weight) and diversity (ten zoologicals groups for a total of 98 species). Three suspension feeding species were dominant: Ophiothrix fragilis, Urticina felina and Alcyonium digitatum accounted for more than 95% of the total biomass at all sampling periods. Spatial heterogeneity analysis confirmed the role of these three dominant species. Heterogeneity revealed at a scale of 0.1 m2 by dendrograms (qualitative similarity index) or by Factor Correspondence Analysis (FCA) (on biomasses) was due to the strong dispersion of rare species. The influence of the observation scale was visualised by building Rank-Frequency Diagrams using progressively aggregated replicates. The distribution of relative biomasses and the rank of the dominant species always stabilized at scale of 0.4 or 0.5 m2. The three dominant species were overdispersed at a scale of 0.1 m2 compared with a Poisson distribution. Spatial competition among the three species was suggested by their dispersion in the plane of the FCA. Calculation of a multiple linear regression (at the scale of 0.8 m2) showed negative relationships among these dominant species. Temporal homogeneity was indicated (at a scale of 0.8 m2) by dendrograms of species similarities among samples and by FCA performed on total biomasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024478
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    Paper (German National Licenses)
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  • 3
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    Large-scale variation in combined impacts of canopy loss and disturbance on community structure and ecosystem functioning. (2013)
    PUBLIC LIBRARY SCIENCE
    In:  EPIC3PLoS ONE, PUBLIC LIBRARY SCIENCE, 8(9), pp. e66238, ISSN: 1932-6203
    Details
    Publication Date: 2019-07-17
    Description: Ecosystems are under pressure from multiple human disturbances whose impact may vary depending on environmental context. We experimentally evaluated variation in the separate and combined effects of the loss of a key functional group (canopy algae) and physical disturbance on rocky shore ecosystems at nine locations across Europe. Multivariate community structure was initially affected (during the first three to six months) at six locations but after 18 months, effects were apparent at only three. Loss of canopy caused increases in cover of non-canopy algae in the three locations in southern Europe and decreases in some northern locations. Measures of ecosystem functioning (community respiration, gross primary productivity, net primary productivity) were affected by loss of canopy at five of the six locations for which data were available. Short-term effects on community respiration were widespread, but effects were rare after 18 months. Functional changes corresponded with changes in community structure and/or species richness at most locations and times sampled, but no single aspect of biodiversity was an effective predictor of longer-term functional changes. Most ecosystems studied were able to compensate in functional terms for impacts caused by indiscriminate physical disturbance. The only consistent effect of disturbance was to increase cover of non-canopy species. Loss of a canopy algae temporarily reduced community resistance to disturbance at only two locations and at two locations actually increased resistance. Resistance to disturbance-induced changes in gross primary productivity was reduced by loss of canopy algae at four locations. Location-specific variation in the effects of the same stressors argues for flexible frameworks for the management of marine environments. These results also highlight the need to analyse how species loss and other stressors combine and interact in different environmental contexts.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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