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  • Natural resource accounting  (1)
  • Retinogeniculate transmission  (1)
  • barnacle  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 70 (1988), S. 399-405 
    ISSN: 1432-1106
    Keywords: Visual system ; Lateral geniculate nucleus ; Retinogeniculate transmission ; ROC curves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The spike trains of X and Y retinal ganglion cell axons and neurons in the lateral geniculate nucleus (LGN) of cats were compared to determine if the visual signal could be better discriminated from the maintained activity in the LGN relative to the retina. Curves for relative or receiver operating characteristics (ROC) were derived from the interspike interval data of the spike trains using maintained activity as “noise” and visually-driven activity as the “signal”. Analyses were also made using spike densities and more restricted time intervals. Although it was expected that neurons in the LGN might better distinguish the signal from the noise, the results of the ROC curve and spike density analyses did not bear out this expectation; that is, neither the X or Y cells in the LGN provided better discrimination of the visually-driven activities from the maintained activities compared to the incoming retinal information. Thus, at least in the anesthetized preparation, the LGN does not play a role in increasing the signal-to-noise ratio.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Environmental and resource economics 4 (1994), S. 29-53 
    ISSN: 1573-1502
    Keywords: Natural resource accounting ; ecological monitoring ; biodiversity ; sustainability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Economics
    Notes: Abstract The role that natural resource accounting and ecological monitoring can play in conserving biological diversity is discussed. There exists a widespread view that modifications to national income accounting procedures are crucial to the pursuit of sustainability and particularly the protection of biodiversity. However, we argue that the availability of biologically-adjusted national income figures would not, of itself, be likely to contribute significantly to the protection of biological resources. The conservation of biodiversity requires, among other things, a significantly improved understanding of the nature of environmental changes arising from imposed management regimes and the effects that these changes have on the persistence of biodiversity. On this basis, and in the context of sustainable development, we suggest that ecological monitoring should take priority over the generation of economic data. In many regions of the world sufficient ecological knowledge is available to design and implement integrated monitoring networks that can be used to track the status of many components of biodiversity and inform decisions taken over their management. We outline how this might be undertaken using a hierarchical and prioritised approach aimed, pragmatically, in the first instance at helping to preserve those ecosystems, communities and species which are perceived to be most threatened. Some emphasis is given to the Australian situation because it is the only rich megadiversity nation and it is at the forefront of the development of scientific techniques that can be used to help design soundly-based and cost-effective monitoring programs.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-5117
    Keywords: barnacle ; biofilm ; cypris ; recruitment ; fouling ; microalgae ; succession ; rocky ; intertidal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Barnacle cypris larvae show considerable exploratory behaviour prior to habitat selection. The influence of natural epilithic microbial fouling organisms on the settlement of Semibalanus balanoides cyprids (Crustacea: Cirripedia) was examined using laboratory and field based investigations. In choice chambers, cues from microbial films were important; cyprids preferred surfaces with a mature microbial film to either unfilmed surfaces or those with a developing film. Cyprids also discriminated between filmed rocks from different tidal heights, preferentially selecting those from the mid-shore which is their usual zone. Filmed surfaces which had previously been colonised by barnacles were selected in preference to unfilmed surfaces, but the presence of an adult barnacle did not enhance settlement on either filmed or unfilmed surfaces. However, laboratory experiments were not consistent with settlement in the field which was predominantly influenced by the proximity of conspecifics and by traces of previous barnacle colonisation. These factors increased settlement, and seemed to over-rule cues from microbiota within the film. Difficulties in the application of laboratory based studies to settlement in the natural environment are discussed.
    Type of Medium: Electronic Resource
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