Sean Ulm

Indo-European and Asian origins for Chilean and Pacific chickens revealed by mtDNA

European chickens were introduced into the American continents by the Spanish after their arrival in the 15th century. However, there is ongoing debate as to the presence of pre-Columbian chickens among Amerindians in South America, particularly in relation to Chilean breeds such as the Araucana and Passion Fowl. To understand the origin of these populations, we have generated partial mitochondrial DNA control region sequences from 41 native Chilean specimens and compared them with a previously generated database of ≈1,000 domestic chicken sequences from across the world as well as published Chilean and Polynesian ancient DNA sequences. The modern Chilean sequences cluster closely with haplotypes predominantly distributed among European, Indian subcontinental, and Southeast Asian chickens, consistent with a European genetic origin. A published, apparently pre-Columbian, Chilean specimen and six pre-European Polynesian specimens also cluster with the same European/Indian subcontinental/Southeast Asian sequences, providing no support for a Polynesian introduction of chickens to South America. In contrast, sequences from two archaeological sites on Easter Island group with an uncommon haplogroup from Indonesia, Japan, and China and may represent a genetic signature of an early Polynesian dispersal. Modeling of the potential marine carbon contribution to the Chilean archaeological specimen casts further doubt on claims for pre-Columbian chickens, and definitive proof will require further analyses of ancient DNA sequences and radiocarbon and stable isotope data from archaeological excavations within both Chile and Polynesia.

Behavioural complexity in Eurasian Neanderthal populations: A chronological examination of the archaeological evidence

Whether Neanderthals were capable of behaviours commonly held to be the exclusive preserve of modern humans — such as abstract thought, language, forward planning, art, reverence of the dead, complex technology, etc. — has remained a fundamental question in human evolutionary studies since their discovery more than a hundred years ago. A lack of quantitative data on Neanderthal symbolism and complex behaviour is a key obstacle to the resolution of this question, with temporal analyses usually confined to single regions or short time periods. Here we present an approach to the issue of symbolism and complex behaviours among Neanderthals that examines the frequency of key proxies for symbolic and complex behaviours through time, including burials, modified raw materials, use of pigments, use of composite technology and body modification. Our analysis demonstrates that the number and diversity of complex Neanderthal behaviours increases between 160,000 and 40,000 years ago. Whether this pattern derives from preservation factors, the evolution of cognitive and behavioural complexity, cumulative learning, or population size is discussed. We take the view that it is not the apparent sophistication of a single specific item, nor the presence or absence of particular types in the archaeological record that is important. Instead, we believe that it is the overall abundance of artefacts and features indicative of complex behaviours within the Neanderthal archaeological record as a whole that should provide the mark of Neanderthal capabilities and cultural evolutionary potential.

Australian Marine Reservoir Effects: A Guide to ΔR Values

The principles of marine reservoir correction in Australia as well as a guide to regional and subregional radiocarbon values extracted from the Reimer and Reimer database and Ulm are discussed. Some of the limitations in prediction of the radiocarbon values are highlighted.

New Marine ΔR Values for the South Pacific Subtropical Gyre Region

This paper presents 31 new ΔR results of known-age, pre-AD 1950 shells from the South Pacific subtropical gyre region, spanning from the Tuamotu Archipelago in the east to New Caledonia in the west. This doubles the number of available ΔR values for the Oceania region. These values indicate that the regional offset (ΔR) from the modeled radiocarbon marine age has remained relatively constant over the last 100 yr prior to 1950. Variation from the norm can be attributed to various influences including localized upwelling around islands, the presence of a hardwater effect, direct ingestion of old carbon by the live shellfish, or enhanced exchange with atmospheric CO2 as a consequence of photosynthetic activity or increased aeration.

New direction in human colonisation of the Pacific: Lapita settlement of south coast New Guinea

Abstract Expansion of Austronesianspeaking peoples from the Bismarck Archipelago out into the Pacific commencing c.3300 cal BP represents the last great chapter of human global colonisation. Bismarck Indonesia Archipelago Papua New Guinea Torres Strait Caution Bay The earliest migrants were bearers of finelymade dentate-stamped Lapita pottery, hitherto found only across Island Melanesia and western Polynesia. We document the first known occurrence of Lapita peoples on the New Guinea mainland. The new Lapita sites date from 2900 to 2500 cal BP and represent a newly-discovered migratory arm of Lapita expansions that moved westwards along the southern New Guinea coast towards Australia. These marine specialists ate shellfish, fish and marine turtles along the Papua New Guinea mainland coast, reflecting subsistence continuities with local pre-Lapita peoples dating back to 4200 cal BP. Lapita artefacts include characteristic ceramics, shell armbands, stone adzes and obsidian tools. Our Lapita discoveries support hypotheses for the migration of pottery-bearing Melanesian marine specialists into Torres Strait of northeast Australia c.2500 cal BP.

From small holes to grand narratives: The impact of taphonomy and sample size on the modernity debate in Australia and New Guinea

Our knowledge of early Australasian societies has significantly expanded in recent decades with more than 220 Pleistocene sites reported from a range of environmental zones and depositional contexts. The uniqueness of this dataset has played an increasingly important role in global debates about the origins and expression of complex behaviour among early modern human populations. Nevertheless, discussions of Pleistocene behaviour and cultural innovation are yet to adequately consider the effects of taphonomy and archaeological sampling on the nature and representativeness of the record. Here, we investigate the effects of preservation and sampling on the archaeological record of Sahul, and explore the implications for understanding early cultural diversity and complexity. We find no evidence to support the view that Pleistocene populations of Sahul lacked cognitive modernity or cultural complexity. Instead, we argue that differences in the nature of early modern human populations across the globe were more likely the consequence of differences in population size and density, interaction and historical contingency.

Holocene Demographic Changes and the Emergence of Complex Societies in Prehistoric Australia

A continental-scale model of Holocene Australian hunter-gatherer demography and mobility is generated using radiocarbon data and geospatial techniques. Results show a delayed expansion and settlement of much of Australia following the termination of the late Pleistocene until after 9,000 years ago (or 9ka). The onset of the Holocene climatic optimum (9-6ka) coincides with rapid expansion, growth and establishment of regional populations across ~75% of Australia, including much of the arid zone. This diffusion from isolated Pleistocene refugia provides a mechanism for the synchronous spread of pan-continental archaeological and linguistic attributes at this time (e.g. Pama-Nyungan language, Panaramitee art style, backed artefacts). We argue longer patch residence times were possible at the end of the optimum, resulting in a shift to more sedentary lifestyles and establishment of low-level food production in some parts of the continent. The onset of El Niño - Southern Oscillation (ENSO; 4.5-2ka) restricted low-level food production, and resulted in population fragmentation, abandonment of marginal areas, and reduction in ranging territory of ~26%. Importantly, climate amelioration brought about by more pervasive La Niña conditions (post-2ka), resulted in an intensification of the mobility strategies and technological innovations that were developed in the early- to mid-Holocene. These changes resulted in population expansion and utilization of the entire continent. We propose that it was under these demographically packed conditions that the complex social and religious societies observed at colonial contact were formed.

High-resolution radiocarbon dating of marine materials in archaeological contexts: radiocarbon marine reservoir variability between Anadara, Gafrarium, Batissa, Polymesoda spp. and Echinoidea at Caution Bay, Southern Coastal Papua New Guinea

The remains of shellfish dominate many coastal archaeological sites in the Pacific and provide a wealth of information about economy, culture, environment and climate. Shells are therefore the logical sample type to develop local and regional radiocarbon chronologies. The calibration of radiocarbon (14C) dates on marine animals is not straightforward, however, requiring an understanding of habitat and dietary preferences as well as detailed knowledge of local ocean conditions. The most complex situations occur where terrestrial influences impinge on the marine environment resulting in both the enrichment and depletion of 14C (Ulm Geoarchaeology 17(4):319–348, 2002; Petchey and Clark Quat Geochronol 6:539–549, 2011). A sampling protocol that combines a high-resolution excavation methodology, selection of short-lived samples identified to species level, and a tri-isotope approach using 14C, δ13C and δ18O, has given us the ability to identify 14C source variation that would otherwise have been obscured. Here, we present new research that details high-resolution mapping of marine 14C reservoir variation between Gafrarium tumidum, Gafrarium pectinatum, Anadara granosa, Anadara antiquata, Batissa violacea, Polymesoda erosa and Echinoidea from the Bogi 1 archaeological site, Caution Bay, southern coastal Papua New Guinea. These isotopes highlight specific dietary, habitat and behavioural variations that are key to obtaining chronological information from shell radiocarbon determinations.

Coastal Foragers on Southern Shores: Marine Resource Use in Northeast Australia since the Late Pleistocene

The sea is central to the lives of contemporary coastal Aboriginal and Torres Strait Islander people across northeast Australia. Indigenous histories and documentary sources show the sea to be a vital source of subsistence, raw materials, spirituality and connection with other peoples. Coasts, and especially islands, were a focus of occupation, with high population densities linked to low mobility along the length of the Queensland coast. But what are the antecedents of these people–sea relationships? In this review, the archaeological evidence for coastal foraging across northeast Australia from the late Pleistocene is explored and the main themes and challenges in developing an understanding of how coastal resources figured in the lives of ancient Australians are discussed.

Pre-Bomb Marine Reservoir Variability in the Kimberley Region, Western Australia

New ΔR values are presented for 10 known-age shells from the Kimberley region of northwest Australia. Previous estimates of ΔR for the Kimberley region are based on only 6 individual shell specimens with dates of live collection known only to within 50 yr (Bowman 1985a). Here, we describe the results of our recent attempts to constrain ΔR variability for this region by dating a suite of known-age pre-AD 1950 shell samples from the Australian Museum and Museum Victoria. A regional ΔR of 58 ± 17 14C yr for open waters between Broome and Cape Leveque is recommended based on 7 of these specimens. The criteria used to select shells for dating and inclusion in the regional mean are discussed.