Site Abandonment Research Articles

Play is a privilege in both humans and animals: how our recreation influences wildlife

AbstractNature‐based tourism nets roughly 8 billion annual travelers globally to all regions of Earth, with many visiting around 200,000 formally protected areas. Financially well‐off tourists pay for playful activities and effects on wildlife are potentially large and relatively uncertain. Our commentary makes 3 points. First, variation in resource privileges and associated benefits characterizes not only humans but other species. Among animals, well‐nurtured populations engage in more playful and leisurely activities than do those nutritionally impoverished. Privilege depends partially on birth sites, parents, and local conditions, but for humans recreation expands with monetary advantage. Second, nature‐based tourism has 2 generalizable effects on wildlife, each involving degree of habituation. Among non‐habituated populations, local site abandonment is frequent and modulated by seasonality, individuals' physiological states, and whether recreation is motorized or not. For habituated populations, tolerance emerges to increasing recreational exposure with some populations of species learning to rely on humans to shield as a buffer against possible predation. Third, desert bighorn sheep (Ovis canadensis nelsoni) offer a robust example of the issues surrounding the effects of tourism on wildlife because of the geographically complicated relationship between recreational pursuit and wildlife on public lands of the western United States. While protected for decades, females have failed to habituate to different forms of recreation at certain sites. The result has been flight or site abandonment. Biodiversity protection at numerous scales has made strong gains but is still needed where progress is stymied by income disparities, privilege, and increasing recreation ventures.

The Byzantine Insular Countryside in the Early Middle Ages (ca. 600-ca.900): The Cases of Sicily, Cyprus, and Crete in (partial) Light of Environmental Archaeology

ABSTRACT This paper provides an overview of rural surveys and environmental archaeology studies on Sicily, Cyprus and Crete during the Byzantine Empire. It re-evaluates traditional interpretations of agricultural settlement patterns, ecosystems and populations from Late Antiquity to the early Middle Ages (late sixth to late ninth century). The prevailing narrative that these islands were devastated by Arab incursions, leading to widespread depopulation, economic collapse and abandonment of rural sites in favour of fortified hilltop settlements, is questioned. Instead, the study employs a comparative and interdisciplinary approach, combining environmental and climatic data with historical and archaeological evidence. This method offers a more nuanced understanding of how insular rural societies adapted to changing environmental and human conditions during the Byzantine Empire's transition from an economically unified region to a fragmented Medieval Mediterranean. The findings highlight the resilient nature of land use and rural settlement patterns amidst the transformation of the empire's political, military and administrative structures.

Beyond Abandonment: Diachronically Mapping the Transformation of Domestic Sites in Rome and its Environs (1st-7th centuries CE)

This article presents some preliminary findings on the transformation and abandonment of domestic sites in and around Rome from the 1st to 7th centuries Common Era (CE). I utilize an innovative interactive map developed in Unity to showcase 46 sites in the study area, devising a methodology that draws upon the stratigraphic record of human activities in charting the trajectory of ancient houses over time. This contrasts with the standard approaches used over the last few decades, which have focused almost entirely on key moments of architectural and decorative remodelling, underemphasizing the constant and diachronic nature of change in domestic environments. My findings highlight the need to reassess conventional narratives surrounding the "end of the Roman house". Based on the data in this study, the Roman house emerges as more variable and less programmatic than often acknowledged, including in periods predating Late Antiquity. Future work is planned for presenting the full results of the research introduced in this paper, including those related to the application of game engines for mapping archaeological data from household excavations.

Closure of Khor Al Balid and Khor Rori harbours/estuaries with coastal uplift and aridity in the 12th – 15th c. CE and evidence for an extreme overwash event in the 18th – 19th c. CE: Implications for ancient port sites in southern Oman

Ancient maritime trading ports along the southern coast of Oman have been the target of archaeological excavations for several decades. Though historical chronologies are well-researched, information from a paleoenvironmental perspective is lacking and can provide a more complete understanding of site development. This study investigates the timing of coastal sand barrier accumulation in the natural harbours at Khor Al Balid and Khor Rori, which had considerable effects on the populations at the ancient cities of al–Balīd and Sumhuram, respectively. Six cores from Khor Al Balid and four cores from Khor Rori were analyzed using sedimentological, microfossil (foraminifera and testate amoebae), geochemical (μXRF), and radiocarbon dating methods. Marine proxies (e.g., Amphistegina spp., C. pseudolobatulus, E. limbatum, Sr, Ca/Si) and lagoon proxies (e.g., T. macrescens, T. inflata, C. constricta and C. aculeata, Ti/Ca, Fe/Ca) were used to identify Marine Sand, Brackish Lagoon/Marsh, and Freshwater facies. Results indicate that the eastern arm of Khor Al Balid closed off from the sea around the 12th century CE and that the western arm closed around the 15th century CE. Siltation of harbours and the formation of sand barriers may have contributed towards site abandonment. Previous archaeological findings suggest that al-Balīd was able to continue with maritime trade activities along the southern seaside edge of the city for several centuries after siltation of Khor Al Balid, possibly with the help of dredging. An extreme overwash event was recorded in almost all cores across both sampling sites, suggesting that a very large cyclone or a tsunami hit the southern Oman coast sometime around the 18th–19th century CE. This event, as well as continuous coastal sand accumulation, may have contributed to the decline and abandonment of Khor Al Balid and highlights the impacts that large storm/wave events have on archaeological site preservation.

Re-wilding Ritual: An Archaeological Study of Plants in Ritual Contexts in the Traprain Law Environs, Scotland

ABSTRACT The study of European prehistory has often associated natural objects as menacing presences rooted in fears concerning, at a basic level, continued subsistence and combative conciliatory ritual practice. Nevertheless, in this time, ritual is imprinted upon entire landscapes with natural objects manipulated to construct ritual spaces. This article considers the nature and purpose of natural objects, specifically plant species, within prehistoric ritual practice in Scotland through consideration of the Traprain Law environs, East Lothian. Within prehistoric contexts, the Traprain Law environs are formed partly through the physical manifestations of ideology in a network of ritual sites. In this context, plants as natural objects are a community integral to ritual networks, whether through ritualized clearance, symbolic usage in cremation, votive offering, or deposition prior to site abandonment. There are many ways in which plant remains occupied space within ritual taskscapes in prehistoric Scotland.

Tsunami deposits in Tunisia contemporaneous of the large 365 CE Crete earthquake and Mediterranean Sea catastrophic event

New field investigations along the East Tunisian coastline reveal sedimentary deposits and damaged localities that may account for a catastrophic event during the late Holocene. North of Sfax city, ~ 3.4 m high cliff coastal marine and alluvial terraces show 20 to 50-cm-thick chaotic layer with sandy coarse gravels mixed with reworked pebbles, broken shells of gastropods and molluscs, organic matter and Roman pottery. The chaotic layer truncates sandy-silty paleosol, covers Roman settlements and is overlain by fire remains, a thin sandy-silty aeolian unit and ~ 1-m-thick alluvial deposits. Charcoal samples collected at 10 cm below and 4 cm above the catastrophic deposits provide radiocarbon dating that brackets the catastrophic unit between 286 and 370 CE. Other historical investigations on the Roman sites of Neapolis (Nabeul), Hadrumete (Sousse), Thyna (Sfax), Meninx in Girba (Djerba), Wadi Ennouili (Gulf of Gabes), and Sabratha (in Libya) evidenced major damage and abandonment of sites in the fourth century (16, 41, 42, 43, 44). The new identification of catastrophic deposits, offshore-onshore correlations with turbidites and modelling of tsunami waves suggest the relationship with the 21 July 365 tsunamigenic earthquake (Mw ~ 8) of west Crete (Greece) and call for a better estimate of tsunami risk on the Mediterranean coastlines.

Power line density and habitat quality: key factors in Canarian houbara bustard decline

Summary Species’ declines are caused by a combination of factors that affect survival and/or breeding success. We studied the effects of a set of environmental and anthropogenic variables on the disappearance of Canarian Houbara Bustards Chlamydotis undulata fuertaventurae on Fuerteventura (Canary Islands), once the main stronghold of this endangered bird. Of 83 male display sites detected in 1997–1998, only 29 remained occupied in 2020–2021 (a 65% decrease in only 23 years). We compared habitat quality, density of conspecifics, other steppe birds and crows, presence of human infrastructure, and degree of environmental protection between these 29 extant sites and the 54 extinct sites using univariate analyses and generalised linear models (GLMs). The most influential variable in the abandonment of display sites was the Normalised Difference Vegetation Index (NDVI), an indicator of green vegetation productivity, which suggests a strong effect of habitat aridification due to climate change on the population’s extinction process. Powerline density was the second most important factor. This suggests that houbaras have survived where a greater abundance of food resources has enabled a higher breeding success, and where powerline fatalities have caused lower mortality over the years. Higher densities of houbaras, and other steppe birds and crows at extant display sites confirmed the better habitat quality in these areas. Extant display sites, located generally in protected areas, also had lower densities of human infrastructure (e.g. buildings, roads). We discuss the conservation implications of these results and provide management recommendations for this endangered subspecies.

Ending the war on error: towards an archaeology of failure

Failure is a fundamental part of the human condition. While archaeologists readily identify large-scale failures, such as societal collapse and site abandonment, they less frequently consider the smaller failures of everyday life: the burning of a meal or planning errors during construction. Here, the authors argue that evidence for these smaller failures is abundant in the archaeological record but often ignored or omitted in interpretations. Closer examination of such evidence permits a more nuanced understanding both of the mundane and the larger-scale failures of the human past. Excluding failure from the interpretative toolbox obscures the reconstruction of past lives and is tantamount to denying the humanity of past peoples.

Human–environment interactions at Ta'ab Nuk Na, a submerged Maya salt works site in Belize

Abstract Sea-level rise and settlement are investigated at Ta'ab Nuk Na, an ancient Maya salt works in Belize, by examining samples from wooden posts and marine sediment. The samples included Post 145 of Building B and the Nunavut beam, along with marine sediment columns cut from beside both wooden posts. The sediment columns were sampled at 2 cm intervals. Loss-on ignition confirmed the presence of organic material. Identifying the organic content involved removing nonorganic material from the sediment and sorting the organic material under magnification. This procedure established that most of the organic material was red mangrove (Rhizophora mangle). Red mangroves tolerate salt water, but under conditions of sea-level rise, the plants grow vertically to keep their leaves above water. Sediment, leaves, and detritus trapped in the prop roots form mangrove peat, which serves as a proxy for sea-level rise. AMS dating of fine red mangrove roots determined that the local sea levels rose at Ta'ab Nuk Na throughout the Late Classic period and continued into the Postclassic period. Radiocarbon dates obtained from the wood-post samples yielded Late Classic–period dates. Comparing the radiocarbon dates from the wooden posts and the sediment core samples determined that the site was abandoned before the rising seas flooded the area. Evidently, sea-level rise did not play a role in site abandonment.

Can we reliably detect adaptive responses of hunter-gatherers to past climate change? Examining the impact of Mid-Holocene drought on Archaic settlement in the Basin-Plateau Region of North America

Climatic change appears to influence major patterns in human history. However, confirming the association between climatic events and adaptive human responses is not straightforward given the potential for spurious correlations and uncertainty in the timing of events. Here we leverage theory from behavioral and population ecology to generate predictions about causal relationships between climate and settlement decisions. We then test those predictions using statistical methods designed to evaluate associations under uncertainty. This allows us to evaluate a comprehensive record of radiocarbon dated archaeological sites in the Basin-Plateau region of North America relative to a record of effective precipitation reconstructed using Macrophysical Climate Models. Consistent with theory, the results show that regional populations declined in the mid-Holocene during a prolonged period of reduced precipitation, leading to the abandonment of many major rockshelter sites. Remaining populations concentrated at open-air sites around well-watered sand dune localities where they constructed pithouses and adopted more intensive subsistence practices. These findings illustrate an adaptive response of hunter-gatherer populations to past climate change that supports theoretical predictions and is unlikely to result from spurious correlations or uncertainties in the timing of events.

Late Holocene Size Variation of Mytilus californianus Remains from Shelter Cove (CA-HUM-182), Northern California

ABSTRACT Here we evaluate variation in Mytilus californianus size from CA-HUM-182, comparing patterns with those from Punta Gorda Rock Shelter that suggested sustainable resource management. Using a novel equation, we reconstruct the size profile of the assemblage over time and provide a new age-depth chronology. Results indicate no decrease in size over time; instead, increases are observed from initial harvest (∼730 cal BP) to site abandonment (∼260 cal BP), suggestive of sustainable practices and the possibility of conservation.

Túrkeve-Terehalom in the Eastern Carpathian Basin. Bronze Age multi-stratified site provides high-precision chronology with continental implications

Abstract The multi-stratified site of Túrkeve-Terehalom presents an exceptional opportunity to establish the start and the end of the Middle Bronze Age in the Eastern Carpathian Basin and to refine its inner chronology. The chronological potential of the site rests on the meticulous excavation campaigns over a decade. This potential has been harvested by linking stratified finds, particularly pottery, to narrow, calibrated age-ranges. The result has implications for local chronology while also prompting questions about how to synchronise long-range connectivity with central and northern Europe and the Aegean, as well. The resulting chronological model for Túrkeve-Terehalom firstly challenges prevailing chronological views regarding the life-spans of Bronze Age structures with beaten clay floors, secondly the direction of the wave of destruction and/or abandonment of multi-stratified sites in the Carpathian Basin, and thirdly the continental networking during the Middle Bronze Age.

Sea-level rise in Southwest Greenland as a contributor to Viking abandonment

The first records of Greenland Vikings date to 985 CE. Archaeological evidence yields insight into how Vikings lived, yet drivers of their disappearance in the 15th century remain enigmatic. Research suggests a combination of environmental and socioeconomic factors, and the climatic shift from the Medieval Warm Period (~900 to 1250 CE) to the Little Ice Age (~1250 to 1900 CE) may have forced them to abandon Greenland. Glacial geomorphology and paleoclimate research suggest that the Southern Greenland Ice Sheet readvanced during Viking occupation, peaking in the Little Ice Age. Counterintuitively, the readvance caused sea-level rise near the ice margin due to increased gravitational attraction toward the ice sheet and crustal subsidence. We estimate ice growth in Southwestern Greenland using geomorphological indicators and lake core data from previous literature. We calculate the effect of ice growth on regional sea level by applying our ice history to a geophysical model of sea level with a resolution of ~1 km across Southwestern Greenland and compare the results to archaeological evidence. The results indicate that sea level rose up to ~3.3 m outside the glaciation zone during Viking settlement, producing shoreline retreat of hundreds of meters. Sea-level rise was progressive and encompassed the entire Eastern Settlement. Moreover, pervasive flooding would have forced abandonment of many coastal sites. These processes likely contributed to the suite of vulnerabilities that led to Viking abandonment of Greenland. Sea-level change thus represents an integral, missing element of the Viking story.

A review of the conservation status of Black Stork Ciconia nigra in South Africa, Lesotho, and Eswatini

Summary Across South Africa, Lesotho, and Eswatini, long-term citizen science atlas data have suggested concerning declines in the population of Black Stork Ciconia nigra. Unlike the Asian and European populations, the southern African Black Stork population is described as resident and is listed as “Vulnerable” in South Africa, Lesotho, and Eswatini. Here we report on surveys of historical nesting locations across northern South Africa, finding evidence for nest site abandonment and limited evidence of recent breeding. We undertook detailed species distribution modelling within a maximum entropy framework, using occurrence records from the BirdLasser mobile app. We cross-validated the models against information in the Southern African Bird Atlas Project (SABAP2) database, highlighting Lesotho as an important potential breeding area. Additionally, we used SABAP2 to assess population trends by investigating interannual patterns in reporting rate. Comparing current reporting rates with those from SABAP1 (1987–1992), we found that there has been a dramatic decrease. We noted that a large proportion of the population occurs outside the breeding range during the breeding season, suggesting a considerable non-breeding population, especially in the extensive wildlife refuge of the Kruger National Park. The slow declines observed might be indicative of a population which is not losing many adults but is failing to recruit significant numbers of juveniles due to limited breeding. Using densities derived from transect surveys, we used predictive models to derive estimates of breeding range carrying capacity and a population estimate, which suggested declines to numbers around 600 for this subregion. Minimising disturbance at breeding sites of this cliff-nesting species and improving water quality at key population strongholds are pathways to improving the status of the species in the subregion.

Colonization Dynamics of LBK Farmers in Europe under Geostatistics Test

Exploiting a database developed during a previous research project, this study uses factor analyses, GIS techniques and basic geostatistics to evaluate in detail the agro-ecological determinants of the first Neolithic diffusion in continental temperate Europe (the Linearbandkeramik or LBK), as well as its underlying settlement dynamics around half a millennium (5550–4925 BCE). More than 6600 LBK site locations, spread from Moldavia to Normandy, are initially assessed for their informative coherence and ability to offer a unified perspective on the evidence established at more local and regional levels. Most of these data can be used to define the broad geo-pedological options involved in the location of sites across Europe; loess substrate was far from being an exclusive settlement choice and a variety of soils, typically of medium moisture, were exploited. LBK farmers thus had a great capacity to adapt to the different geographical contexts they encountered. With regard to settlement dynamics in Central and Western Europe, the data reveal a systemic interplay between creation, stability and abandonment of sites, supporting the diffusion of the LBK subsistence system. The progressive decline in the number of new sites was compensated by an increase in their stability until the last stage of the expansion process. At this point, abandonments became widespread without significant renewal, except in the westernmost regions. The easternmost parts of Europe could not be integrated in the large-scale temporal modelling, since the chronological data available in the database are insufficiently precise. Shedding new light on the systemic variability of the geo-environmental options followed by these early farmers and highlighting some modalities and spatial-temporal limits of the resilience of their agro-sylvo-pastoral system, our overall analysis confirms and somewhat clarifies current interpretations of the LBK phenomenon.

Northeast Yucatan hurricane activity during the Maya Classic and Postclassic periods

The collapse of the Maya civilization in the late 1st/early 2nd millennium CE has been attributed to multiple internal and external causes including overpopulation, increased warfare, and environmental deterioration. Yet the role hurricanes may have played in the fracturing of Maya socio-political networks, site abandonment, and cultural reconfiguration remains unexplored. Here we present a 2200 yearlong hurricane record developed from sediment recovered from a flooded cenote on the northeastern Yucatan peninsula. The sediment archive contains fine grain autogenic carbonate interspersed with anomalous deposits of coarse carbonate material that we interpret as evidence of local hurricane activity. This interpretation is supported by the correlation between the multi-decadal distribution of recent coarse beds and the temporal distribution of modern regional landfalling storms. In total, this record allows us to reconstruct the variable hurricane conditions impacting the northern lowland Maya during the Late Preclassic, Classic, and Postclassic Periods. Strikingly, persistent above-average hurricane frequency between ~ 700 and 1450 CE encompasses the Maya Terminal Classic Phase, the declines of Chichén Itza, Cobá, and subsequent rise and fall of the Mayapán Confederacy. This suggests that hurricanes may have posed an additional environmental stressor necessary of consideration when examining the Postclassic transformation of northern Maya polities.

Numerical Analysis of Potential Contaminant Migration from Abandoned In Situ Coal Conversion Reactors

Abstract. In the context of a potential utilisation of coal resources located in the Mecsek mountain area in Southern Hungary, an assessment of groundwater pollution resulting from a potential water-borne contaminant pool remaining in in situ coal conversion reactors after site abandonment has been undertaken in the scope of the present study. The respective contaminants may be of organic and inorganic nature. A sensitivity analysis was carried out by means of numerical simulations of fluid flow as well as contaminant and heat transport including retardation to assess spatial contaminant migration. Hereby, the main uncertainties, e.g., changes in hydraulic gradient and hydraulic contributions of the complex regional and local fault systems in the study area, were assessed in a deterministic way to identify the relevant parameters. Overall 512 simulations of potential groundwater contamination scenarios within a time horizon exceeding the local post-operational monitoring period were performed, based on maximum contaminant concentrations, cumulative mass balances as well as migration distances of the contaminant plume. The simulation results show that regional faults represent the main contaminant migration pathway, and that contamination is unlikely assuming the given reference model parametrisation. However, contamination within a simulation time of 50 years is possible for specific geological conditions, e.g., if the hydraulic conductivity of the regional faults exceeds a maximum value of 1 × 10−5 m s−1. Further, the parameter data analysis shows that freshwater aquifer contamination is highly non-linear and has a bimodal distribution. The bivariate correlation coefficient heatmap shows slightly positive correlations for the pressure difference, the fault permeability and the simulation time, as well as a negative correlation for the retardation coefficient. The results of this sensitivity analysis have been integrated into a specific toolkit for risk assessment for that purpose.

Risk assessment methodology for Underground Coal Gasification technology

Geoenergy technologies, including the Underground Coal Gasification (UCG), are currently being considered as possible solutions for reducing emissions of CO2 and other gases to atmosphere and at the same time, provide sustainable sources of low-carbon energy. In this paper, a flexible risk assessment methodology for UCG technology is presented, based on an established methodology for radioactive waste repositories. The assessment methodology can be applied at any stage in a project, between initial planning and final site abandonment. Central to the approach is the analysis of scenarios, which represents a “source-pathway-receptor” combination and its evolution. Here, a Reference Scenario (RS) and several Alternative Scenarios (AS) are developed and analysed using a numerical model. Results of the RS suggest that contaminant concentrations at an evaluation point are far below any level that could reasonably be detected. In some AS, the calculated concentrations showed an increasing trend at the end of the assessment period, potentially approaching levels that conceivably could be detected. However, as such cases are unexpected and pessimistic, their inclusion is to illustrate worst cases that could happen, rather than to give predictions. An illustrative application demonstrates that plausibly the risks of groundwater contamination from a UCG site should be very low if the site is developed and operated appropriately. The outcomes from applying the numerical model are intended to demonstrate how the methodology and the numerical model can be readily adapted to different sites.

Episodic habitation and abandonment of Neolithic civilization sites in the Vaigai River Basin, Southern India

Recent studies have unearthed and recovered multiple sites with evidences of past human habitations in terms of ceramic, metal, precious stone, jewel, and stone tool industries and places of varied methods of burial and worship are being unearthed at different stratigraphic levels from floodplains of the Vaigai River Basin, Southern India. In this contribution, we present high-resolution 14C chronology of the archaeological artefacts, cultural evidence and the textural characteristics of sediments collected from the excavated pits. These data along with the information on regional geology, geomorphology, sedimentary facies, texture, petrography, and mineralogy constrain the older phase of the Vaigai River Basin Civilization to be microlithic in age, followed by affirmative evidence of ca. 5511-5147 BCE (7455-7091 cal yr BP). This was followed by few more colonization/cultural/habitation sites/surfaces at ca. 2976-2961 BCE (4938-4908 cal yr BP), 1860-1489 BCE (3543-3503 cal yr BP),530-390 BCE (2435-2314 cal yr BP), 596-629 CE (1353-1321 cal yr BP) and post 1225-1312 CE (729-619 cal yr BP). These are designated as habitation sites/surfaces namely HS-1, HS-2, HS-3, HS-4, HS-5 and HS-6, respectively. Evidences of urbanism, industrial and leisure activities besides cohabitation of at least three groups that practiced mutually exclusive burial customs are documented. Microlithic tools and buried habitation stages, together with the prevalence of modern habitations, make this basin unique with human occupation at least since the mid-Holocene. Major shifts of the trunk channel of the Vaigai River, perhaps associated with flood events, marooned/buried/destroyed the ancient habitation sites that forced the inhabitants to abandon old sites and led to the reestablishment of newer ones. Inevitable dependence of the ancient societies on the riverbanks and the flood plains for settlements and livelihood compounded with the lack of knowledge on extreme climatic events possibly caused the decimation of several settlements of this important civilization from south India.

Archaeological and dating evidence for the 8.2 ka BP climate event on the island of Gökçeada, Northeast Aegean

The 8.2 ka BP event is one of the most proeminent and abrupt climatic events of the Holocene, showing generally drier and colder conditions for ca. 160 years, but there are also variations in climatic impacts by region. Dating and archaeological evidence indicates that the impact of the climate event varies by region, from large‑scale site abandonment to continued occupation and local adaptation. The dating evidence from Uğurlu on the Island of Gökçeada, Northeast Aegean, shows that there is a clear hiatus in 14C dates between ca. 8220 and 8000 cal BP, corresponding to the 8.2 ka BP climate event. This paper presents dating and archaeological evidence from Uğurlu and discusses the consequences of evidence in terms of the 8.2 ka BP climate event.