Modelling copepod development: current limitations and a new realistic approach     

Gentleman  W. C.; Neuheimer  A. B.; Campbell  R. G. 《ICES Journal of Marine Science》2008,65(3):399-413

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Determining spatial changes in the diet of nearshore suspension-feeders along the South African coastline: Stable isotope and fatty acid signatures     

E. Louise Allan  Shan T. AmbroseNicole B. Richoux  P. William Froneman 《Estuarine, Coastal and Shelf Science》2010

Mesoscale oceanographic features, such as upwellings, are known to play an important role in regulating the structure and productivity of nearshore marine communities. Stable isotope (δ¹³C and δ¹⁵N) and fatty acid analyses were employed to assess the influence of an upwelling cell along the south-eastern coastline of southern Africa on the diet of the mussel, Perna perna. Eight sites were sampled: two upstream, three in the vicinity and three downstream of the upwelling cell. Stable isotope and fatty acid signatures indicated that the mussels consumed a diet of detritus derived mainly from macroalgae, diatoms and dinoflagellates. One-way ANOVA on the δ¹³C and δ¹⁵N signatures and the principal component analysis of the fatty acid profiles of the mussels identified distinct groups corresponding to the above mentioned regions. The proportion of diatom biomarkers in the fatty acid profiles decreased downstream of the upwelling region while the proportion of dinoflagellate biomarkers increased. Upwelling regions are typically associated with elevated levels of productivity; however, these systems usually become silicon depleted and result in the replacement of diatoms with dinoflagellates. The highest proportions of the dinoflagellate markers were recorded in the two furthest sites downstream of the upwelling cell. The spatial variation in the diet of the mussels, therefore, appears to reflect the presence of the upwelling cell in the nearshore biology of the region.  相似文献   

Cultural sediment analyses and transitions in early fishing activity at Langenesværet,Vesterålen,Northern Norway     

Ian A. Simpson  Sophia Perdikaris  Gordon Cook  John L. Campbell  William J. Teesdale 《Geoarchaeology》2000,15(8):743-763

The development of specialized and commercial fishing activity in the island archipelago of Lofoten and Vesterålen in northern Norway is a critical foundation from which to understand the subsequent spread of commercial fishing across the north Atlantic region during the medieval and early modern period. One little understood aspect of this development is the relationship between medieval commercial fishing stations (fiskevaer) and earlier fishing activity. In this article, cultural sediment deposits at Langenesværet, Vesterålen, Northern Norway provide an opportunity to examine this relationship and its implications for current historical models of fishing development in northern Norway and the north Atlantic region. Conventional and AMS radiocarbon dating techniques are used to establish a chronology for the deposits, while activities associated with the sediments are characterized using thin‐section micromorphology supported by proton induced X‐ray emission spectrometry (PIXE). The results suggest that the site commenced formation as early as ca. 3000 B.C. and that the site was first used for specialized fishing activity from the early centuries A.D. The medieval commercial fiskevaer settlement at Langenesværet was introduced to an area that had a longstanding tradition of specialised fishing activity. © 2000 John Wiley & Sons, Inc.  相似文献   

Jamestown: The Buried Truth. William M. Kelso, 2006, University of Virginia Press,Charlottesville, Virginia,and London,xiv + 238 pp., $ 29.95 (hardcover)     

Allan S. Gilbert 《Geoarchaeology》2009,24(1):112-115

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A Fissure-Controlled Acidic Volcanic Centre (Ordovician) at Yr Arddu,North Wales     

M. F. Howells  S. D. G. Campbell  A. J. Reedman  S. P. Tunnicliff 《Geological Journal》1987,22(2):133-149

The Yr Arddu Tuffs (Ordovician) are a sequence of predominantly welded acid ash-flow tuffs in the outlier centred on Yr Arddu (North Wales). The tuffs accumulated above a NNE-trending fracture, the Yr Arddu Fracture, which had previously influenced sedimentation. The heterogeneity of the tuffs and their restricted development suggest that they represent proximal accumulations from small or suppressed (boiling-over) eruption columns. The eruptions and emplacement developed, at least in the initial stages, in a submarine environment. Lithological, geochemical and palaeontological evidence indicates that the tuffs represent the earliest eruptive phase of the Lower Rhyolitic Tuff Formation. They were later intruded by comagmatic rhyolite domes, whose alignment reflects the continued influence of the early fracture.  相似文献