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  • 1
    Electronic Resource
    Electronic Resource
    The life cycle of Laodicea indica (Laodiceidae, Leptomedusae, Cnidaria) (1991)
    Springer
    Hydrobiologia 216-217 (1991), S. 151-157 
    Details
    ISSN: 1573-5117
    Keywords: Hydrozoa ; life cycles ; Laodicea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The life cycle of Laodicea indica is described. In the Bismarck Sea this species shows a normal alternation of generations in the wet season; but in the dry season the cycle is contracted, and planulae give rise to gonothecae without formation of a hydroid colony. Medusae are liberated about 3 d after planula settlement. This life cycle pattern is previously unreported in hydromedusae. The possible adaptive value of such a life cycle and the evolution of polyp reduction in hydromedusan life cycles are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026456
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Data integration for European marine biodiversity research: creating a database on benthos and plankton to study large-scale patterns and long-term changes (2010)
    Springer
    In:  Hydrobiologia, 644 (1). pp. 1-13.
    Details
    Publication Date: 2019-09-23
    Description: The general aim of setting up a central database on benthos and plankton was to integrate long-, medium- and short-term datasets on marine biodiversity. Such a database makes it possible to analyse species assemblages and their changes on spatial and temporal scales across Europe. Data collation lasted from early 2007 until August 2008, during which 67 datasets were collected covering three divergent habitats (rocky shores, soft bottoms and the pelagic environment). The database contains a total of 4,525 distinct taxa, 17,117 unique sampling locations and over 45,500 collected samples, representing almost 542,000 distribution records. The database geographically covers the North Sea (221,452 distribution records), the North-East Atlantic (98,796 distribution records) and furthermore the Baltic Sea, the Arctic and the Mediterranean. Data from 1858 to 2008 are presented in the database, with the longest time-series from the Baltic Sea soft bottom benthos. Each delivered dataset was subjected to certain quality control procedures, especially on the level of taxonomy. The standardisation procedure enables pan-European analyses without the hazard of taxonomic artefacts resulting from different determination skills. A case study on rocky shore and pelagic data in different geographical regions shows a general overestimation of biodiversity when making use of data before quality control compared to the same estimations after quality control. These results prove that the contribution of a misspelled name or the use of an obsolete synonym is comparable to the introduction of a rare species, having adverse effects on further diversity calculations. The quality checked data source is now ready to test geographical and temporal hypotheses on a large scale.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1007/s10750-010-0108-z
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Vortical Amplification of the Magnetic Field at an Inward Shock of Supernova Remnant Cassiopeia A (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-06-22
    Description: Author(s): F. Fraschetti, S. Katsuda, T. Sato, J. R. Jokipii, and J. Giacalone We present an interpretation of the time variability of the x-ray flux recently reported from a multiepoch campaign of 15 years of observations of the supernova remnant Cassiopeia A by Chandra. We show for the first time quantitatively that the [4.2–6] keV nonthermal flux increase up to 50% traces t... [Phys. Rev. Lett. 120, 251101] Published Thu Jun 21, 2018
    Keywords: Gravitation and Astrophysics
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 4
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    The stability of European rocky shore assemblages: variation across a latitudinal gradient and the role of canopy-forming macroalgae. (2012)
    Wiley-Blackwell
    In:  EPIC3Oikos, Wiley-Blackwell
    Details
    Publication Date: 2014-04-17
    Description: Compensatory dynamics, overyielding and statistical averaging are mechanisms promoting the temporal stability of natural communities. Using the model of European intertidal rocky shore assemblages and collating 17 datasets, we investigated how the strength of these stability-enhancing mechanisms varies with latitude and how it can be altered by the loss of habitat-formers (e.g. canopy-forming macroalgae). Community stability decreased with increasing latitude, mostly as a consequence of a greater synchronization of species fluctuations. Statistical averaging and overyielding (i.e. richness effects) promoted stability, but their strength did not vary with latitude. The experimental removal of macroalgal canopies caused a strengthening of the statistical averaging effect that was consistent across the latitudinal gradient investigated. Nonetheless, the loss of canopies depressed stability by enhancing the synchronization of species fluctuations on southernmost shores, while it had weak effects on shores at higher latitudes. Variation in life-history traits among canopy-forming species and/or in prevailing environmental conditions across a gradient of latitude could underlie variable effects of habitat-formers on species fluctuations. Our study shows i) that the stability of intertidal assemblages and strength of compensatory dynamics varies with latitude, ii) that canopy-forming macroalgae, exerting a strong control on understorey species, can influence the strength of compensatory dynamics and iii) that biological forcing (i.e. facilitation) can be as important as environmental forcing in enhancing the synchronization of species fluctuations.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 5
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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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    PAPER (OA)
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