GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Macrobenthic metabolism as carbon and nitrogen fluxes in a coastal area exposed to strong tidal currents (Dover Strait, eastern English Channel) (1998)
    Springer
    Hydrobiologia 375-376 (1998), S. 307-315 
    Details
    ISSN: 1573-5117
    Keywords: carbon budget ; nitrogen budget ; macrobenthic ; coastal area
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In view of recent studies of a Dover Strait macrobenthic community (eastern English Channel), an annual budget of carbon and nitrogen fluxes is proposed and discussed in order to understand the contribution of macrobenthic metabolism in this productive coastal area (phytoplanktonic production = 336 g C m-2 y-1). In this area typical of coarse sediments which are exposed to strong tidal currents in the English Channel, the macrobenthic compartment is suspected to be responsible for the major part of exchanges at the bottom-boundary layer. The macrobenthic biomass is high (mean annual biomass = 281 g afdw m-2) and dominated by three species (98.5%): the ophiurid Ophiothrix fragilis and the two cnidarians Urticina felina and Alcyonium digitatum. Carbon and nitrogen budgets including ingestion, production, respiration, excretion and egestion allow the estimation of annual fluxes from the water column to the benthic compartment (Ingestion = 820 g C m-2 y-1 and 130 g N m-2 y-1) and from the benthic compartment to the water column (Respiration + Egestion = 710 g C m-2 y-1 and Excretion + Egestion = 100 g N m-2 y-1). The net metabolism, as the difference between primary production and consumption of organic matter, shows that this coastal ecosystem is heterotrophic. Its functioning is based on allochtonous material and advection and it appears to be an important source of carbon dioxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017052804716
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    facet.materialart.
    Unknown
    Relationships between biodiversity and the stability of marine ecosystems: comparisons at a European scale using meta-analysis. (2015)
    ELSEVIER SCIENCE BV
    In:  EPIC3Journal of Sea Research, ELSEVIER SCIENCE BV, 98, pp. 5-14, ISSN: 1385-1101
    Details
    Publication Date: 2015-06-16
    Description: The relationship between biodiversity and stability of marine benthic assemblages was investigated through meta-analyses using existing data sets (n = 28) covering various spatial (m-km) and temporal (1973-2006; ranging from 5 to 〉250 months) scales in different benthic habitats (emergent rock, rock pools and sedimentary habitats) over different European marine systems (North Atlantic and western Mediterranean). Stability was measured by a lower variability in time, and variability was estimated as temporal variance of species richness, total abundance (density or % cover) and community structure (using Bray-Curtis dissimilarities on species composition and abundance). Stability generally decreased with species richness. Temporal variability in species richness increased with the number of species at both quadrat (〈1 m2) and site (100 m2) scales, while no relationship was observed by multivariate analyses. Positive relationships were also observed at the scale of site between temporal variability in species richness and variability in community structure with evenness estimates. This implies that the relationship between species richness or evenness and species richness variability is slightly positive and depends on the scale of observation. Thus, species richness does not stabilize temporal fluctuations in species number, rather species rich assemblages are those most likely to undergo the largest fluctuations in species numbers and abundance from time to time. Changes within community assemblages in terms of structure are, however, generally independent of biodiversity. Except for sedimentary and rock pool habitats, no relationship was observed between temporal variation of total abundances and diversity at either scale. Overall, our results emphasise that the relation between species richness and species-level measures of temporal variability depend on scale of measurements, type of habitats and the marine system (North Atlantic and Mediterranean) considered.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 3
    facet.materialart.
    Unknown
    Stressed but stable: Canopy loss decreased species synchrony and metabolic variability in an intertidal hard-bottom community (2012)
    PUBLIC LIBRARY SCIENCE
    In:  EPIC3PLoS ONE, PUBLIC LIBRARY SCIENCE, 7(5), pp. e36541, ISSN: 1932-6203
    Details
    Publication Date: 2019-07-17
    Description: The temporal stability of aggregate community properties depends on the dynamics of the component species. Asynchronous species dynamics can maintain stability (i.e. invariability in aggregate properties) through temporal complementarities between species with different environmental tolerances. Few manipulative studies have, however, tested in natural conditions the response of this mechanism to multiple stressors. In field experiments we tested the separate and interactive effects of two stressors associated with storminess—loss of a canopy-forming species and mechanical disturbances—on species synchrony and community respiration of intertidal hard-bottom communities on Helgoland Island, NE Atlantic. Treatments consisted of regular removal of the canopy-forming seaweed Fucus serratus and a mechanical disturbance applied once at the onset of the experiment in March 2006. The level of synchrony in species abundances was assessed from estimates of species percentage cover every three months until September 2007. Experiments at two sites consistently showed that canopy loss significantly reduced species synchrony. Mechanical disturbance had neither separate nor interactive effects on species synchrony. Accordingly, in situ measurements of CO2-fluxes showed that canopy loss, but not mechanical disturbances, significantly reduced temporal variation in community respiration during emersion periods. Our results support the idea that compensatory dynamics may stabilise aggregate properties. They further suggest that the ecological consequences of the loss of a single structurally important species may be stronger than those derived from smaller-scale mechanical disturbances in natural ecosystems.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...