Early Human Settlement Research Articles

Submerged bridge constructed at least 5600 years ago indicates early human arrival in Mallorca, Spain

Reconstructing early human colonization of the Balearic Islands in the western Mediterranean is challenging due to limited archaeological evidence. Current understanding places human arrival ~4400 years ago. Here, U-series data from phreatic overgrowth on speleothems are combined with the discovery of a submerged bridge in Genovesa Cave that exhibits a distinctive coloration band near its top. The band is at the same depth as the phreatic overgrowth on speleothems (−1.1 meters), both of which indicate a sea-level stillstand between ~6000 and ~5400 years ago. Integrating the bridge depth with a high-resolution Holocene sea-level curve for Mallorca and the dated phreatic overgrowth on speleothems level constrains the construction of the bridge between ~6000 and ~5600 years ago. Subsequent sea-level rise flooded the archeological structure, ruling out later construction dates. This provides evidence for early human presence on the island dating at least 5600 and possibly beyond ~6000 years ago.

Camelids in the hyperarid core of the Atacama desert 12,000–11,000 years ago? A stable isotope study and its consequences for early human settlement

How did hunter-gatherers initially settle and move across extreme environments? We conducted a multi-disciplinary study to tackle this question, focusing on how Paleoindigenous populations inhabited the hyperarid core of the Atacama Desert. Particularly, we examined the stable isotopic values of ∼12,000–11,200-year-old camelid and rodent bones and hair samples retrieved from low-elevation archaeological sites (Pampa del Tamarugal basin - PdT, 800–1200 masl). By integrating novel and existing data into a regional stable isotope ecology, we offer a baseline for interpreting our results. δ13C and δ15N values on archaeological remains show animals with different geographical origins. A first group includes camelids and rodents with lower δ15N values and δ13C values indicating a dominantly C3 diet, corresponding to animals either local to the PdT or from the Andean Steppe, at least ∼80 km away and between 4000 and 4500 masl. Most of these remains, however, come from residential sites and belong to young camelids, indicating a local origin. A second group presents a higher δ15N signal and δ13C values indicative of a mixed C3–C4 based diet. These animals were not local but source to the Puna at least ∼60 km away between 3200 - 4000 masl. We hypothesize that the first would correspond to animals associated with hunter-gatherer bands settled around a wetland and grove environment in the PdT. The second group could correspond to remains brought by humans from the Puna to the PdT. Our results demonstrate that during the Late Pleistocene/Early Holocene the Atacama was very different than today, supporting life that included large and mid-size game. These results also show that the core of the Atacama attracted animals and people and counters the notion of this ecosystem as a barren passageway from the Andes to the coast.

Increasing Population Status of Broad-Snouted Caiman (Caiman latirostris) Based on Sustainable Use Strategies in a Managed Protected Area in Santa Fe, Argentina.

People and crocodilians have engaged in interactions since the earliest human settlements. After many years of escalating non-regulated use, coupled with emerging threats such as habitat modification, environmental pollution, and the exponential growth of human populations, natural crocodilian populations have been pushed to the brink of extinction. To prevent this, various initiatives have implemented strategies to prevent local extinction. Reinforcing wild populations through reintroductions and head-starting programs has been considered the safest approach to recovering crocodilian populations. Subsequently, the concept of sustainability emerged. In the case of many historically exploited crocodilian species, it became evident that rational utilization need not adversely affect population status; on the contrary, there were clear signs of recovery when local communities were involved. In 1990, the broad-snouted caiman (Caiman latirostris) was in a critical state due to decades of poaching and the aforementioned threats. In response, the "Monitoring and restocking program of the broad-snouted caiman for management purposes", commonly known as Proyecto Yacaré, was established to study population abundance and assess the biological, ecological, and social response to this management methodology. As a result of the eggs's harvest, a proportion equivalent to or greater than what would have survived in natural conditions was released into the original habitat where the eggs were collected. The surplus was allocated for leather and meat production with a focus on economic and environmentally sustainable practices, without affecting biodiversity or threats to the managed species. The in situ work carried out by this program has been crucial for the recovery of broad-snouted caiman populations under the "incentives for conservation" system, whereby local communities receive benefits for nest identification and egg harvesting. Over time, conservation incentives have become significant contributors to regional economies. This study illustrates how C. latirostris populations increased due to the implementation of egg harvesting by local communities in a natural reserve for management purposes. This population increase was detected through continuous night monitoring and an analysis of the number of nests in the area. Currently, C. latirostris populations have transitioned from being among the most threatened to becoming one of the most abundant throughout their distribution area. Based on the analyzed information, we may affirm that the commercial value of these species is one of the most relevant aspects contributing to the sustainability of these programs, primarily due to the change in perception generated among local communities. Therefore, identifying and controlling factors affecting these programs are fundamental for the conservation of these species.

Unraveling Island Economies through Organic Residue Analysis: The Case of Mocha Island (Southern Chile)

Abstract Biophysical conditions played a fundamental role in early human colonization of insular territories, particularly in food-producing societies dealing with limited resources and the challenges of maintaining a sustainable carrying capacity. Studies on past human colonization of small oceanic islands thus offer insights into economic plasticity, ecological impacts, and adaptation of early food-producing groups. On the coast of southern Chile, early evidence is dated to 950 cal BP of island colonization by coastal populations with mainland subsistence systems based on the exploitation of marine resources, along with gathering, managing, and cultivating plants and hunting terrestrial animals. Strikingly, the extent to which these mixed economies contributed to insular colonization efforts is largely unknown. Here we used organic residue analysis of ceramic artifacts to shed light on the subsistence of populations on Mocha Island in southern Chile. We extracted and analyzed lipids from 51 pottery sherds associated with the El Vergel cultural complex that flourished in southern Chile between 950 and 400 cal BP. Chemical and stable isotope analysis of the extracts identified a range of food products, including C3 and C4 plants and marine organisms. The results reveal the central role of mixed subsistence systems in fueling the colonization of Mocha Island.

30,000 years of fishing in the Philippines: New ichthyoarchaeological investigations in Occidental Mindoro

Marine adaptations are considered to have been significant factors in the evolution of our species (Homo sapiens). As humans dispersed from Africa around 100 kya, marine resources provided essential nutrients in island environments of the tropical Southeast Asian seas. The Philippine archipelago has revealed significant evidence of early human settlement during this period of coastal migration. Yet, despite being a global marine biodiversity hotspot, few studies have investigated prehistoric marine adaptations there. In this study, we focus on the analysis of fish bones from three sites in Occidental Mindoro, Philippines: Bubog I, Bubog II, and Bilat Cave with the aim of enhancing the understanding of H. sapiens' coastal adaptations and maritime interactions since at least 32,000 BP. We utilized expanded skeletal element identification protocols to determine the lowest taxonomic level possible, combined with diversity indices. The analyses indicate that H. sapiens on Mindoro mostly exploited near-shore environments, with temporal variations in fishing practices reflecting differences in site occupation intensity and periods of climate-mediated habitat change. Inter-site variations in fishing practices are likely related to disparities in local marine habitats. Spatiotemporal differences in marine environments influenced the development of diverse fishing methods and technologies, demonstrating a detailed knowledge of local aquatic environments and the adaptability of modern humans in Island Southeast Asia since the Pleistocene.

Late Pleistocene to Early Holocene Paleoclimatic Boundaries and Human Settlement of the East Siberian Arctic

This article examines archaeological records relating to the East Siberian Arctic in the Stone Age. It spans approximately 50,000 years, from the early stage of MIS 3 to the Early Holocene. Human settlement of the region can be divided into three main stages: early (~50,000–29,000 BP, MIS 3), middle (~29,000–11,700 BP, MIS 2), and late (11,700–8000 BP). The peopling of Arctic Eurasia and the cultural evolution in that part of the world were driven both by abiotic and biotic factors, as evidenced by the correspondance between archaeologically detectable changes and key paleoclimatic events. Early human settlement of that region is associated with a population marked by West Eurasian genetic ancestry, whose cultural elements are typical for Southern Siberia. The early settlers were replaced by people displaying East Asian ancestry, migrating northwards under the impact of climatic changes. It is concluded that the successful peopling of the Arctic was facilitated by the adoption of critically important innovations such as sewing with eyed bone needles, and manufacture of long shafts and pointed implements made of mammoth tusks. Lithic industries marking various stages are described. That of the early stage is characterized by fl ake technology; in the middle stage, wedge-shaped core technology appeared; and the principal feature of the late stage is microprismatic technology, indicating total population replacement. The onset of the Holocene coincides with a key innovation—land transportation by dogsled, resulting in much higher mobility.

Glacial–Interglacial Cycles and Early Human Evolution in China

China is a crucial region for investigating the relationship between climate change and hominin evolution across diverse terrestrial ecosystems. With the continuous development of palaeoclimatology, chronology, and archaeology, the environmental and hominin record of the Early and Middle Pleistocene in China is steadily accumulating, shedding light on the effects of climate change on the distribution of early human settlements and population dynamics. However, the migration and dispersal of these early humans within long-term climate fluctuations and their underlying mechanisms remain to be clarified. Based on the spatial-temporal distribution of 95 Early to Middle Pleistocene archaeological sites in China, we found that intensified hominin activities gradually shifted southward under the influence of multiple glacial–interglacial cycles. The frequent bidirectional movements of these early humans between north and south were assumed as follows. During glacial periods, hominins living in North China migrated to southern areas, while inter-glacial periods witnessed the northward expansion of hominins inhabiting South China. Among all the potential driving mechanisms, we suggest that the available resources in terrestrial ecosystems may be the most fundamental factor. Combined with paleoenvironmental and archaeological records, we provide an Asian perspective for a better understanding of how the glacial–interglacial cycles shaped early human evolution.

Paleoproteomic evidence reveals dairying supported prehistoric occupation of the highland Tibetan Plateau.

The extreme environments of the Tibetan Plateau offer considerable challenges to human survival, demanding novel adaptations. While the role of biological and agricultural adaptations in enabling early human colonization of the plateau has been widely discussed, the contribution of pastoralism is less well understood, especially the dairy pastoralism that has historically been central to Tibetan diets. Here, we analyze ancient proteins from the dental calculus (n=40) of all human individuals with sufficient calculus preservation from the interior plateau. Our paleoproteomic results demonstrate that dairy pastoralism began on the highland plateau by ~3500 years ago. Patterns of milk protein recovery point to the importance of dairy for individuals who lived in agriculturally poor regions above 3700 m above sea level. Our study suggests that dairy was a critical cultural adaptation that supported expansion of early pastoralists into the region's vast, non-arable highlands, opening the Tibetan Plateau up to widespread, permanent human occupation.

BrGDGT temperature reconstruction from interior Alaska: Assessing 14,000 years of deglacial to Holocene temperature variability and potential effects on early human settlement

Aeolian deposits in the middle Tanana Valley of central Alaska offer a well-preserved record of paleoenvironmental change since the deglacial period (c. 16,000–11,000 cal yr BP). These deposits also contain some of North America's oldest archaeological occupations (c. 14,000–13,000 cal yr BP), making this region critically important for understanding human migration into the high latitudes and the Americas. Major research questions involve assessing the magnitude of deglacial climatic change and the influence of climate on early human groups. This study uses branched glycerol dialkyl glycerol tetraethers (brGDGTs) from six loess-paleosol sequences to develop a quantitative paleotemperature record within terrestrial locations in the Tanana basin that are close to archaeological sites. BrGDGT-derived temperatures demonstrate a lack of cooler temperatures associated with deglacial conditions, making this region relatively “warm” compared to other parts of the globe. Additionally, our brGDGT record shows little coherent temperature change associated with deglacial climate variability (e.g., Bølling-Allerød, Younger Dryas), and Holocene temperatures are relatively stable as well, indicating that temperature fluctuation was not the main driver of environmental or archaeological change over time. We recommend averaging data across multiple terrestrial exposures to produce regional temperature reconstrutions.

Structural diversity: a digital revolution

One of the fundamental rules in biology and ecology is that structure determines function. At a microscale, the transmissibility of COVID-19 is related to the unique structure of the novel coronavirus's trimeric spike protein. At a macroscale, the success of early human settlement along the west coast of North America during the Holocene is likely associated with the rich resources provided by the diverse structures of kelp forests. Until recently, research on ecosystem structure and diversity has lagged, due primarily to a lack of tools to measure these components effectively and accurately. For instance, scientists studying deciduous forests have relied on stem size and leaf area as proxies of forest structure to predict ecosystem functions. However, these traditional, proxy-based metrics are laborious to collect, logistically challenging to assess at large scales, and fail to capture other critical aspects of structural diversity such as canopy depth and complexity, both of which provide better predictions of ecosystem functions and processes as compared to their conventional counterparts. Fortunately, innovations in digital technology and data science are converging to yield a wide range of new research capabilities. As demonstrated by the papers in this Special Issue, ecologists are starting to embrace these promising advances, unlocking opportunities to understand structural diversity. We now have a robust suite of sensors that can be deployed on different platforms and used to map and measure three-dimensional (3D) structures in both terrestrial and aquatic systems, across a wide range of scales and resolutions. For example, modern single-photon lidar can provide wall-to-wall, high-resolution, 3D point cloud data in less than one hour for an area of over 10,000 ha, allowing individual tree-level measurement. Spanning large geographic regions, these unprecedented 3D data will enable investigations of fundamental ecological questions (eg macroscale patterns, scaling) that traditional plot-based approaches cannot. As with other innovations, however, these structural data also bring unencountered challenges. To take full advantage of ecology's digital advances, we argue that the following challenges must be addressed. The first is the necessity to ensure truly transdisciplinary collaboration. Although recognized for decades, the demand for such collaboration has never been greater in 3D structural diversity enabled ecology, especially at its current early stages of development. Most of the skillsets essential to harnessing and realizing the potential of these new technologies currently lie in disciplines beyond ecology and the environmental sciences. We need expertise from aviation technology for stable and safe data acquisition, engineering solutions for sensor integration, geomatics for data registration, computer science for data integration and segmentation, graphic design for visualization, information science for managing data and ensuring fair access, and social science for understanding societal implications and unintended consequences, to name a few. The quickest way for ecologists and environmental scientists to incorporate these research skills into their own work is through collaboration. The second challenge is embracing novel computational platforms (eg super computers, cloud computing) and approaches (eg machine learning and artificial intelligence). When covering large spatial extents, these 3D data often range from gigabytes to terabytes to petabytes in size. Therefore, advanced computing power and algorithms are required to handle them. Third, to better utilize these data, investigators will have to shift from traditional hypothesis-driven approaches to data-driven approaches or to a hybrid of the two. As these 3D data can generate hundreds of variables measuring different aspects of ecosystem structure, making sense of the data, especially when combined with other climatic and geophysical datasets, can be daunting or nearly impossible. Such massively multivariate datasets can quickly overwhelm traditional process-based modeling approaches. When deployed by knowledgeable analysts, machine learning approaches – whether data driven or domain knowledge guided – may reveal insights into ecosystem patterns and processes. Lastly, there is a pressing need to educate our next generation to embrace these digital advances. New data-oriented skills such as acquisition, visualization, analysis, and management of large datasets must become essential parts of ecological training. Consideration of structural diversity is foundational to our understanding of ecological systems. Consequently, advances in 3D data acquisition and analytics will likely reshape our understanding of ecology. Adopting these emerging digital technologies will enable the next generation of ecologists to gracefully operate a fleet of sensors to measure ecosystems and swim freely in the resulting ocean of data.

Sensitivity of coastal southern African climate to changes in coastline position and associated land extent over the last glacial

Paleoclimatic changes in South Africa, especially around the southern Cape region, are of intense interdisciplinary interest; as this is an important area in the context of human evolution, hosting several prominent archaeological sites such as Blombos Cave (located near today's shoreline). In this study, we investigate the sensitivity of climate of coastal southern Africa to changes in glacial variations in sea level and associated land extent, by performing a model sensitivity experiment. Employing a high-resolution (12 km grid spacing) regional climate model (WRF), output from a global model simulation at 70 thousand years ago (ka) is downscaled twice: First using the present-day coastline, then with an estimated coastline position at 70 ka; keeping all other forcing factors identical. Thus we focus on the response of the local climate to an expanded land surface area equivalent to a glacial sea level low stand scenario. Our results reveal that the climate of previously coastal localities shows strong continental characteristics when sea level drops, as the coastline moves away, and a coastal plain is exposed. This is most evident from the year-round warmer days and cooler nights, with up to 6 °C increases (decreases) in daily maximum (minimum) temperatures. This result also extends to extremes. For instance, at the archaeological site of Blombos Cave, temperature extremes (1st and 99th percentiles) of the modelled marine climate become 25- to 75-fold more probable as the coastline shifts. We also find year-round reductions (5–40%) in the amount of precipitation within the region, owing to local modifications in near-surface atmospheric circulation caused by the exposed land. The reductions in precipitation are accompanied by a significant drop in the annual number of rainy days (31 days locally at Blombos Cave). Simulated changes also vary seasonally, with more pronounced and widespread changes in temperature and precipitation occurring during summer. Through isolating and quantifying the effects of land extent variation, our approach demonstrates, for the first time, the role of coastline position in shaping local climate around near-coastal environs. Our results have significant implications for future studies exploring the influence of local coastline changes on early human settlement and mobility patterns.

Animals and Human Society in Asia: Historical, Cultural and Ethical Perspectives

Animals and Human Society in Asia: Historical, Cultural and Ethical Perspectives

The Chronology of Early Human Settlement in Three Gorges Region, China—Contribution of Coupled Electron Spin Resonance and Uranium-Series Dating Method

The Three Gorges region (TGR) located in the geographic center of China, is a transition zone between mountain and plain areas, and a probable migration corridor for hominins and other mammals between South and North China. Detailed chronological information of paleoanthropological evidence in this area could help us better understand the human evolution in East Asia. The OSL and U-series dating methods are two conventional dating methods generally adopted to date such sites; however, their applications were limited by the dating range—restricted to several hundred of millennia and ambiguous stratigraphic relationship between the archaeological remains and the dating target materials. Cosmogenic nuclide burial dating of quartzite stone artifacts and coupled electron spin resonance and uranium series dating (ESR/U-series) of fossil teeth have the potential to date Early–Middle Pleistocene hominin sites in Asia and were applied increasingly in China in recent years. However, the application of cosmogenic 26Al/10Be burial dating is limited in TGR because most sites are dominated by limestone, leading to the scarcity of the quartz component. In this case, the coupled ESR/U-series method plays a more important role in the establishment of the chronology of human settlement. In TGR, by using the coupled ESR/U-series method, we have dated seven important Early and Middle Pleistocene hominin settlement sites, including Longgupo, Jianshi, Yunxian, Meipu, Bailongdong, Changyang, and Yumidong sites. Based on our dating results, we propose that hominins were settled in TGR probably from the early stage of Early Pleistocene (∼2.5−2.2 Ma) at the Longgupo site to the late Middle Pleistocene to Late Pleistocene of the Yumidong site (∼274−14 ka) and very likely to spread to other parts of East Asia during this time period. In view of the potential of coupled ESR/U-series dating on fossil teeth from the hominin sites in the TGR, future work may consider the micro damage or non-destructive analysis of enamel fragment with the ESR method and laser ablation ICP-MS techniques that will make possible the direct dating of precious human fossils in China.

The study of early human settlement preference and settlement prediction in Xinjiang, China

When studying the human settlement process, it is of great significance to understand the prehistoric environment, economy and society by exploring the human–land relationship and the evolution of civilization reflected by the settlement environment. This paper explores the natural and social environmental preferences of early human settlements in Xinjiang, China, from the Palaeolithic to the Bronze Age (45 ka BP–2250 a BP). Through the characteristics of settlement preferences, the distribution of settlements is accurately predicted, and the relationship between settlement preferences and the evolution of the environment and civilization is verified and discussed. We summarize the needs and conditions of early human settlement from the perspectives of the social environment and natural environment and explain the stages, consistency and differentiation of the spatial and temporal evolution of settlement preferences with the interaction of adaptation and transformation. On this basis, we discuss the logical focuses and content of early human settlement preference research. This research provides a reference for the process, representation, driving mode, and research ideas of early human settlement preferences.

Late Pleistocene palaeoenvironments and a possible glacial refugium on northern Vancouver Island, Canada: Evidence for the viability of early human settlement on the northwest coast of North America

Multi-proxy palaeoecological analyses of lake cores from two sites on northern Vancouver Island reveal previously undocumented non-arboreal environments in the region during the late Pleistocene. Radiocarbon, pollen, sedimentary ancient DNA (sedaDNA), diatom, and grain size analyses indicate that Topknot Lake on the west coast of northern Vancouver Island was not glaciated in the last 18,500 years, extending into the hypothesized regional glacial maximum. A cold herb-shrub coastal tundra existed at the site from ca. 17,500–16,000 cal BP with species including willows (Salix), grasses (Poaceae), sedges (Cyperaceae), heathers (Ericaceae), and sagebrush (Artemisia). SedaDNA analysis also supports the presence of rare non-arboreal taxa at Topknot Lake during this interval including Jacob's-ladder (Polemonium), bistort (Bistorta), and wild berries (Rubus). After ca. 16,000 cal BP and through the terminal Pleistocene, pine (Pinus), alder (Alnus), and ferns formed open forests under cool and dry conditions. At Little Woss Lake in the mountains of north-central Vancouver Island, fir (Abies) stands dominated from ca. 14,200–14,100 cal BP, then were replaced by open pine woodland with alder and ferns from ca. 14,100–12,000 cal BP. SedaDNA corroborates these plant taxa as well as indicating grizzly bear (Ursus arctos horribilis) and Chinook salmon (Oncorhynchus tshawytscha) in and around the basin by ca. 14,100 cal BP. Mixed conifer forests of pine, western hemlock (Tsuga heterophylla), and alder spread into the island's interior ca. 12,000–11,100 cal BP during the Pleistocene-Holocene transition. The records from these two lakes demonstrate the diachronous development of postglacial ecosystems on northern Vancouver Island. Furthermore, these data provide key evidence for environments that could have supported human populations on the northwest coast of North America for several millennia during the terminal Pleistocene.

Early Human Colonization, Climate Change and Megafaunal Extinction in Madagascar: The Contribution of Genetics in a Framework of Reciprocal Causations

The relative importance of climate shifts and human activities on Madagascar's Holocene ecological transitions is highly contentious. Increasing evidence supports a scenario of negligible impact of climate changes on megafauna extinctions. However, a comprehensive picture can only be obtained by overcoming a dichotomic view and weighing the contributions of diverse disciplines in an integrated framework. Multidisciplinary approaches implementing genetic data reveal scenarios of higher complexity during the human colonization of the island, sometimes unevenly related to climate-driven landscape transformations. Reconstructions of Holocene demographics from the genomes of living and sub-fossil species show signs of a closer association between past population size contractions and paleo-climatic shifts. From this perspective, the main causes of the megafaunal demise likely trace back to the mutual reinforcement between the ecological shifts that followed the settlement of new immigrants and those induced by millennial climate trends.

A late Pleistocene to Holocene archaeological record from East Kalimantan, Borneo

Recent archaeological excavations at Liang Jon, a limestone rockshelter in the East Kalimantan province of Indonesian Borneo, have revealed a cultural sequence covering the period from around 16,700 calibrated radiocarbon years before present (16.7 kyr cal BP) until the late Holocene—a time of dynamic environmental, social, and economic change throughout Island Southeast Asia. There are few published archaeological sequences from this period of human history from Borneo, a geographically strategic region in the wider early human settlement of the region, highlighting the importance of our initial finds and dating work at Liang Jon. We describe our excavation and present chronostratigraphic and initial summary data to outline the significance this cultural sequence has in reconciling archaeological evidence and dated rock art records from early human cultural behaviour at the easternmost margin of the Late Pleistocene continental landmass of Sunda. Summary data, including stone artefacts, marine shell beads, faunal remains, and a pre-Austronesian burial, contributes to our understanding of regional trends associated with widespread cultural and technological change during the Pleistocene to Holocene transition, when the present-day island of Borneo was formed.

Holocene sea-level change and estuary infill in North West Nelson, central New Zealand

The sedimentary sequences found within estuaries in the north west Nelson region of central New Zealand are investigated in order to quantify the timing of the end of the Post Glacial Marine Transgression. This region has been identified as being relatively stable in terms of vertical tectonic movement during the Holocene, but is yet to yield any reconstructions of eustatic sea level. In this study, we investigate the Holocene infill of a barrier estuary (Parapara Inlet) through sedimentological analysis and radiocarbon dating of 18 vibracores up to 4.2 m in length. It is found that the estuary infilled through a combination of lateral flood tide and fluvial delta progradation as well as vertical central basin infill. The central basin infilled at a consistent rate of 0.4 mm/year in both the mid (7.0–6.0 ka) and late-Holocene (2.5–1.5 ka). By the time of early human (Maori) settlement (c. 1 ka), the estuary surface was at low intertidal elevations with sediment being transported from the fluvial to tidal delta. A discernible change in sedimentation rates could not be associated with Maori settlement; however, infill rates increased to at least 12.5 mm/year in the past 150 years due hydraulic sluicing associated with mining. The sedimentary history of Parapara Inlet is compared to nearby Whanganui Inlet, d’Urville Island and Nelson to establish the character of regional Holocene sea level movement. It is found that relative sea level reached modern elevations between 8 and 7 ka in the region. The similarity between sea level curves for the end of the post glacial marine transgression (PMT) to other tectonically stable sites in northern New Zealand suggests that this curve can now be considered a true eustatic signal for the New Zealand archipelago.

Anthropogenic transitions from forested to human-dominated landscapes in southern Macaronesia

The extinction of iconic species such as the dodo and the deforestation of Easter Island are emblematic of the transformative impact of human colonization of many oceanic islands, especially those in the tropics and subtropics. Yet, the interaction of prehistoric and colonial-era colonists with the forests and forest resources they encountered can be complex, varies between islands, and remains poorly understood. Long-term ecological records (e.g., fossil pollen) provide the means to understand these human impacts in relation to natural change and variability pre- and postcolonization. Here we analyze paleoecological archives in forested landscapes of the Canary Islands and Cabo Verde, first colonized approximately 2,400 to 2,000 and 490 y ago, respectively. We demonstrate sensitivity to regional climate change prior to human colonization, followed by divergent but gradual impacts of early human settlement. These contrast with more rapid transformation in the colonial era, associated with significant increases in anthropogenic pressures. In the Canary Islands, at least two native tree taxa became extinct and lowland thermophilous woodlands were largely converted to agricultural land, yet relictual subtropical laurel forests persisted with limited incursion of nonnative species. In Cabo Verde, in contrast, thermophilous woodlands were depleted and substituted by open landscapes and introduced woodlands. Differences between these two archipelagos reflect the changing cultural practices and societal interactions with forests and illustrate the importance of long-term data series in understanding the human footprint on island ecosystems, information that will be critically important for current and future forest restoration and conservation management practices in these two biodiversity hotspots.

Glacial kettles as archives of early human settlement along the Northern Rocky Mountain Front

AbstractThe Northern Rocky Mountain Front (hereafter Northern Front) is a prominent geographic feature in archaeological models of human dispersal in the terminal Pleistocene and Early Holocene of North America. Testing those models has been arduous because of local geomorphological factors that tend to obliterate or otherwise limit access to archaeological finds of relevant age. In this paper, we present well-stratified archaeological and environmental records dating back to 14,000–13,000 cal yr BP from the site of Billy Big Spring (Blackfeet Indian Reservation, Montana), located on a glacial kettle, a type of landform that has been largely ignored by regional archaeological research to date. Findings from Billy Big Spring show the continuous use of the Northern Front foothills throughout the major climatic and environmental disturbances of the Early Holocene, and possibly the terminal Pleistocene as well. As such, Billy Big Spring contributes to refining several archaeological models of early settlement of the Northern Front, particularly those that posit differential use of foothills versus plains settings during the midst of the Holocene Thermal Maximum. The record at Billy Big Spring also suggests that kettles, regardless of physiographic setting, provide a yet unsuspected and unsampled potential for preserving high-quality and easily accessible early archaeological and paleoenvironmental records.