Looking for Ancient Fish Products Through Invisible Biomolecular Residues in the Roman Production Vats from the Atlantic Coast

As organic materials, fish and its derivative products are perishable and break down rapidly and ultimately disappear. Unless they include bones or scales, the only means of identifying them in the archaeological record is through the identification of the chemical constituents that are left behind after decomposition. Fish flesh mainly consists of proteins and lipids. Since these molecules are unstable they degrade irreversibly after death or discard, losing a significant part of the original chemical elements, consequently hampering or complicating their identification. In this paper, two main types of fish products are considered: raw, salted or cooked fish, and fermented fish-based products. In the first case, the degradation of the native markers results from chemical post-depositional degradation, and eventually thermal degradation during cooking. In the second case, the biochemical processes involve bacteria that cause the rapid decomposition of fish as part of the process of forming fish sauces, such as Roman garum. To detect and identify fish products we combined experimental archaeology and organic analyses. The identification of the degradation products of cholesterol appeared to provide a strong indicator for detecting the presence of fish sauces. Analysis of samples taken from fish-salting vats located along the Atlantic coast (Marsa, Baelo Claudia, Troia, Kerlaz, and Etel) with samples taken from actual experimental garum sauces made from mackerel (Scomber scombrus), sardines (Sardina pilchardus), and/or oysters (Ostreidae), revealed the presence of common markers of fermented fish-based products. The application of the analytical methodology described here to structures involved in ancient fish sauce manufacture and storage has enabled investigation of the production of the sauces by searching directly for the fish markers on the inner sides of the containers. For the first time the addition of molluscs and fruits in the fish product has been identified as part of the process of manufacturing garum.     

Linking Agricultural Policies with Decision-Making: A Spatial Approach

Abstract

The loss of agricultural land and its implications have been of great concern in the last decade. By undertaking a spatial analysis of the appropriation of agricultural land for urban use with an overlay of population and urban data, a focus on the consequences of certain regulations on the dynamics of land-use change is explored. This is achieved by integration of data inventories of agricultural land use for Portugal, and linking this information with CORINE Land Cover data as to assess change in the Algarve. An integrated assessment of agricultural land loss follows, undermined by the consequences of urban sprawl. In this sense, this paper expands on the currently existing decrees which provide support to sustainable development in the region while providing a qualitative assessment of future roles based on ethical values and economic efficiency and offering a feasible framework for policy-makers regarding the trends of urban/agricultural dichotomy in a planning and decision-making context.     

Probabilistic Regionalization via Evidence Accumulation with Random Spanning Trees as Weak Spatial Representations

Spatial clusters contain biases and artifacts, whether they are defined via statistical algorithms or via expert judgment. Graph-based partitioning of spatial data and associated heuristics gained popularity due to their scalability but can define suboptimal regions due to algorithmic biases such as chaining. Despite the broad literature on deterministic regionalization methods, approaches that quantify regionalization probability are sparse. In this article, we propose a local method to quantify regionalization probabilities for regions defined via graph-based cuts and expert-defined regions. We conceptualize spatial regions as consisting of two types of spatial elements: core and swing. We define three distinct types of regionalization biases that occur in graph-based methods and showcase the use of the proposed method to capture these types of biases. Additionally, we propose an efficient solution to the probabilistic graph-based regionalization problem via performing optimal tree cuts along random spanning trees within an evidence accumulation framework. We perform statistical tests on synthetic data to assess resulting probability maps for varying distinctness of underlying regions and regionalization parameters. Lastly, we showcase the application of our method to define probabilistic ecoregions using climatic and remotely sensed vegetation indicators and apply our method to assign probabilities to the expert-defined Bailey's ecoregions.     

Radiocarbon dating of marine shell samples. The marine radiocarbon reservoir effect of coastal waters off Atlantic Iberia during Late Neolithic and Chalcolithic Periods

Radiocarbon dates on marine shells have not been used as extensively as charcoal or bone dates for the setting up of absolute chronologies because interpreting these dates is complicated by the marine radiocarbon reservoir effect. Nevertheless marine shellfish were used widely at least during the Holocene and their shells are abundant and usually well preserved in archaeological deposits located near shorelines. Consequently prior research concerning the oceanographic conditions and the marine radiocarbon reservoir effect of a particular coastal area is needed in order to set up reliable chronologies for that region. Values of regional marine radiocarbon reservoir effect – ΔR – of coastal waters off Atlantic Iberia, some of its variability along the Holocene and its correlation with the upwelling phenomenon were determined during previous research. More data related to the ΔR values for western Portuguese coastal waters during the Late Neolithic and the Chalcolithic, a time interval badly sampled in previous research, were recently obtained. These values can be compared with ΔR values already determined for the Gulf of Cadiz. Besides the importance of these values for a better knowledge of the palaeoceanography and palaeoclimatology of Atlantic Iberia, from now on archaeologists can set up reliable chronologies for Late Neolithic and Chalcolithic contexts using marine shell samples of that origin for radiocarbon dating.     

Portuguese West Coast tourism resorts: an unfinished landscape of territorial liabilities

The research focuses on Portuguese West Coast tourism resorts and addresses the problem of unfinished estates as territorial liabilities left by the Global Financial Crisis on residential tourism and tourism-driven urbanization. After a significant expansion during the golden age, resorts have suffered drastic consequences under the crisis, financial imbalance and stagnation of the real estate market. This situation brings additional problems to land management and adequate responses have not been provided yet. Focusing on the municipality of Óbidos, this paper aims to describe the territorial changes induced by the development of resorts, criss-crossing a morphological analysis with the understanding of the context of the Global Financial Crisis and the assessment of the regulatory framework.     

Regional Polycentrism in a Mountainous Territory: The Case of Covilhã (Portugal) and Alpine Cities

The Portuguese mountain city of Covilhã possesses a singular industrial tradition. Today, many of the urban interventions undertaken result in an urban space and landscape disconnected from the mountains. Alpine mountain cities emerge as emblematic, given the representativeness the Alps assume within the context of European mountains. In the Alpine region, the polycentric system of cities condenses the characteristics associated with the topographical particularities and singular types of inter-municipal and cross-border relationships, where the economic changes and regional policies can be observed with greater clarity due to their specificity. In general terms, the quality of life, based on the landscape values, the identification of the citizens with their territory, and on the territorial planning at different scales, emerges as being linked to the construction of a brand identity based on sustainable urban development. It is in this sphere that the study of Alpine cases can inspire good practices to be applied in the Portuguese territory of the Beira Interior, namely in the medium-sized cities and in the synergies between them and the natural spaces. Thus Covilhã finds itself in an advantageous position to use its situation to construct a city brand in harmony with the mountain territory.     

Currents,visions and voyages: historical geographies of the sea

This paper offers a prospectus for a version of historical geography that puts the seas and oceans at the centre of its concerns. This is pursued in three ways. First, via a discussion of the epistemological and historiographic perspectives that might be taken on geographies of the sea, which argues that the view from the ocean can develop geographies of spaces beyond the local and the national, and can attend to the relationships between the human and natural worlds. Second, through a consideration of the imaginative, aesthetic and sensuous geographies of the sea that contends that maritime worlds open up new experiential dimensions and new forms of representation. Finally, in a survey of the material and social worlds of the oceans that suggests that new life can thereby be breathed into current concerns with global political economy, material geographies, the relationship between knowledge and located practice, and the intersections of social and spatial difference. The paper also provides an introduction to a special issue on the historical geography of the sea.