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Invasive cordgrass (Spartina spp.) in south‐eastern Australia induces island formation,salt marsh development,and carbon storage 下载免费PDF全文
David M. Kennedy Teresa Konlechner Elisa Zavadil Michela Mariani Vanessa Wong Daniel Ierodiaconou Peter Macreadie 《Geographical Research》2018,56(1):80-91
Invasive vegetation species can lead to major changes in the geomorphology of coastal systems. Within temperate estuaries in the southern hemisphere, especially Australia and New Zealand, the cordgrass Spartina spp. has become established. These species are highly invasive, and their prolific growth leads to the development of supratidal environments in formerly intertidal and subtidal environments. Here, we quantified the impact of Spartina invasion on the geomorphology and sequestration capacity of carbon in the sediments of Anderson Inlet, Victoria, Australia. Spartina was first introduced to the area in the 1930s to aid in land reclamation and control coastal erosion associated with coastal development. We found that Spartina now dominates the intertidal areas of the Inlet and promotes accretion (18 mm/year) causing the formation of over 108 ha of supratidal islands over the past 100 years. These newly formed islands are calculated to potentially contain over 5.5 million tonnes of CO2 equivalent carbon. Future management of the inlet and other Spartina‐dominated environments within Australian presents a dilemma for resource managers; on the one hand, Spartina is highly invasive and can outcompete native tidal marshes, thereby warranting its eradication, but on the other hand it is likely more resilient to rising sea levels and has the potential for carbon sequestration. Whether or not the potential advantages outweigh the significant habitat change that is anticipated, any management strategies will likely require additional research into costs and benefits of all ecosystem services provided by Spartina including in relation to nutrient cycling, shoreline stabilisation, and biodiversity as well as in response to the longevity of carbon found within the sediments. 相似文献
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Assessing Spatial Dependence in Count Data: Winsorized and Spatial Filter Specification Alternatives to the Auto-Poisson Model 总被引:2,自引:0,他引:2
Daniel A. Griffith 《Geographical analysis》2006,38(2):160-179
The auto-Poisson probability model furnishes an obvious tool for modeling counts of geographically distributed rare events. Unfortunately, its original specification can accommodate only negative spatial autocorrelation, which itself is a rare event. More recent alternative reformulations, namely, the Winsorized and spatial filter specifications, circumvent this drawback. A comparison of their performances presented in this article reveals some of their relative advantages and disadvantages. 相似文献
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Roger Allen Catherine Asher Michael Bates Daniel Bradburd Robert L. Canfield Howard Crane 《Iranian studies》1995,28(3-4):231-281
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Daniel Baloup 《European Review of History》1995,2(1):19-29
A travers l'exemple d'un recueil de miracles attribués à saint Jacques, dont il confronte l'original latin et la traduction castillane, l'auteur s'interroge sur la place de la littérature didactique dans l'enseignement religieux à la fin du Moyen Age. Après avoir étudié comment les transformations apportées par le traducteur castillan à la version latine faisaient évoluer le texte de la sphère de la littérature miraculeuse vers celle de la littérature didactique, il tente de montrer que si cet ouvrage semble offrir aux fidèles un accès direct au savoir doctrinal, il ne libère pourtant pas ses lecteurs de la tutelle ecclésiastique. Cette démonstration prétend remettre en cause l'idée selon laquelle la diffusion des ouvrages didactiques au XVe siècle aurait permis une appropriation individuelle du savoir et donc une remise en cause du contrôle par l'Eglise de l'enseignement religieux. 相似文献
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James H. Barrett David Orton Cluny Johnstone Jennifer Harland Wim Van Neer Anton Ervynck Callum Roberts Alison Locker Colin Amundsen Inge Bødker Enghoff Sheila Hamilton-Dyer Dirk Heinrich Anne Karin Hufthammer Andrew K.G. Jones Leif Jonsson Daniel Makowiecki Peter Pope Tamsin C. O’Connell Tessa de Roo Michael Richards 《Journal of archaeological science》2011
Archaeological fish bones reveal increases in marine fish utilisation in Northern and Western Europe beginning in the 10th and 11th centuries AD. We use stable isotope signatures from 300 archaeological cod (Gadus morhua) bones to determine whether this sea fishing revolution resulted from increased local fishing or the introduction of preserved fish transported from distant waters such as Arctic Norway, Iceland and/or the Northern Isles of Scotland (Orkney and Shetland). Results from 12 settlements in England and Flanders (Belgium) indicate that catches were initially local. Between the 9th and 12th centuries most bones represented fish from the southern North Sea. Conversely, by the 13th to 14th centuries demand was increasingly met through long distance transport – signalling the onset of the globalisation of commercial fisheries and suggesting that cities such as London quickly outgrew the capacity of local fish supplies. 相似文献