Ken Aplin’s research while affiliated with Smithsonian Institution and other places

The Archaeology of Tanamu 1 presents the results from Tanamu 1, the first site to be published in detail in the Caution Bay Studies in Archaeology series. In 2008–2010, the Caution Bay Archaeological Project excavated 122 stratified sites 20km northwest of Port Moresby, south coast of Papua New Guinea. This remains the largest archaeological salvage program ever undertaken in the country. Yielding well-provenanced and finely dated assemblages of ceramics, faunal remains, and stone and shell artefacts, this remarkable set of sites has extended the geographical range of the Lapita cultural complex to not only the mainland of Papua New Guinea, but more remarkably to its south coast, at Australia’s doorstep. At least as important has been the discovery of rich and well-defined layers deposited up to c. 1700 years before the emergence of Lapita in the Bismarck Archipelago, providing insights into pre-ceramic cultural practices on the Papua New Guinea south coast. Sites and layers interdigitate across the Caution Bay landscape to reveal a 5000-year story, each site contributing unique details of the grander narrative. Positioned near the coast on a sand ridge, Tanamu 1 contains three clear occupational layers: a pre-Lapita horizon (c. 4050–5000 cal BP), a Late Lapita horizon (c. 2750–2800 cal BP), and sparser later materials capped by a dense ethnohistoric layer deposited in the past 100–200 years. Fine-grained excavation methods, detailed specialist analyses and a robust chronostratigraphy allows for a full and transparent presentation of data to start laying the building blocks for the Caution Bay story. Open access full text available at: https://www.archaeopress.com/Archaeopress/Products/9781803270883

The Archaeology of Tanamu 1 presents the results from Tanamu 1, the first site to be published in detail in the Caution Bay Studies in Archaeology series. In 2008–2010, the Caution Bay Archaeological Project excavated 122 stratified sites 20km northwest of Port Moresby, south coast of Papua New Guinea. This remains the largest archaeological salvage program ever undertaken in the country. Yielding well-provenanced and finely dated assemblages of ceramics, faunal remains, and stone and shell artefacts, this remarkable set of sites has extended the geographical range of the Lapita cultural complex to not only the mainland of Papua New Guinea, but more remarkably to its south coast, at Australia’s doorstep. At least as important has been the discovery of rich and well-defined layers deposited up to c. 1700 years before the emergence of Lapita in the Bismarck Archipelago, providing insights into pre-ceramic cultural practices on the Papua New Guinea south coast. Sites and layers interdigitate across the Caution Bay landscape to reveal a 5000-year story, each site contributing unique details of the grander narrative. Positioned near the coast on a sand ridge, Tanamu 1 contains three clear occupational layers: a pre-Lapita horizon (c. 4050–5000 cal BP), a Late Lapita horizon (c. 2750–2800 cal BP), and sparser later materials capped by a dense ethnohistoric layer deposited in the past 100–200 years. Fine-grained excavation methods, detailed specialist analyses and a robust chronostratigraphy allows for a full and transparent presentation of data to start laying the building blocks for the Caution Bay story. Open access full text available at: https://www.archaeopress.com/Archaeopress/Products/9781803270883

Islands can be powerful demonstrations of how destructive invasive species can be on endemic faunas and insular ecologies. Oceanic islands in the eastern Indian Ocean have suffered dramatically from the impact of one of the world’s most destructive invasive species, the black rat, causing the loss of endemic terrestrial mammals and ongoing threats to ground-nesting birds. We use molecular genetic methods on both ancient and modern samples to establish the origins and minimum invasion frequencies of black rats on Christmas Island and the Cocos-Keeling Islands. We find that each island group had multiple incursions of black rats from diverse geographic and phylogenetic sources. Furthermore, contemporary black rat populations on these islands are highly admixed to the point of potentially obscuring their geographic sources. These hybridisation events between black rat taxa also pose potential dangers to human populations on the islands from novel disease risks. Threats of ongoing introductions from yet additional geographic sources is highlighted by genetic identifications of black rats found on ships, which provides insight into how recent ship-borne human smuggling activity to Christmas Island can negatively impact its endemic species.

IntroductionThe southern Arnhem Land plateau contains a rich mosaic of thousands of rock art sites located in outcrops of Proterozoic Marlgowa Sandstone of the Kombolgie formation (Carson et al. 1999) (Figure 11.1). Within this region in Jawoyn Country can be found Nawarla Gabarnmang, an impressive rockshelter exhibiting a gridded network of pillars that supports a thick ceiling of 10 cm to 40 cm thick cross-beds of hard sandstone and quartzite (Figures 11.2 and 11.3; see also Chapter 10). The inter-layer joints and fissures between these compact and poorly soluble quartz-rich sandstones and quartzites have witnessed geologically slow dissolution of the bedrock, resulting in a hollowing out of the rock in a process known as ‘ghost rock’ formation or ‘phantomisation’ (Quinif 2010), a particular cave-forming process causing the regular gridshaped structure of underground cavities and pillars (for details of site formation processes, see Chapter 13).The remnant pillars supporting ceiling rock strata at Nawarla Gabarnmang are an anthropic cave structure (Delannoy et al. 2013; see Chapter 10): in addition to the slow geological dissolution of the rock along layer planes and fissure lines, people have also entirely or partially removed individual pillars, and possibly ceiling strata, over a period commencing sometime after the site was first occupied around 50,000 years ago (e.g. David et al. 2011, completed manuscript). What catches one’s attention at Nawarla Gabarnmang are the voids between the pillars, typically c. 1–2 m apart in the southwestern corner of the site, but more than 8 m apart in the central eastern portion. In that noticeably more open central-eastern area, a large, sub-horizontal and flat ceiling is supported by some 20 sparsely distributed pillars. Here, as in most other parts of the site, the floor of the sheltered area is generally flat and sub-horizontal, consisting of ashy sand with sparsely scattered, relatively small blocks of rock originating from the ceiling but not in their original fallen positions (these blocks have all, without exception, been moved by people). Within the fill across the site are rich archaeological deposits including stone artefacts, ochre pieces and animal bones, as revealed in the archaeological excavations (David et al. 2011; Geneste et al. 2012). What we see today in the shelter are the results of tens of thousands of years of human occupation, modification of rock surfaces and site use that express well the notion of ‘dwelling’ and ‘inhabitation’ (e.g. David et al. 2013, 2014; Delannoy et al. 2013; Geneste et al. 2010; cf. Ingold 2000; Thomas 2008).

Western Arnhem Land in northern Australia has the rare distinction, both at national and global scales, of containing a vast landscape of many thousands of rockshelters richly decorated with art, some of which was probably made tens of thousands of years ago, others as recently as a few decades ago. Yet the challenge remains as to how to date this art, how to find out how old it is. While relative dating methods have been commonly applied, in particular patterns of superimposition and changing faunal themes supposedly signalling changing environmental conditions, we still lack a clear understanding of the age of almost all the region’s art styles or conventions.Other chapters in this volume report direct dates for Arnhem Land art using radiocarbon determinations on beeswax figures with the likelihood that the ‘art event’, the time when a beeswax figure was made, is at most a few years different from the ‘carbon event’, the time of the last biological capture of atmospheric carbon, which is the actual date measured by radiocarbon. But many, in fact most, sites have no beeswax figures or other ways directly to date the art. Sometimes, as again reported in this volume, there is some indication of date when a radiocarbon determination is obtained on, for instance, charcoal in an archaeological deposit that can be related to the art. Often that route is also blocked: many a painted surface without beeswax figures is in no close relation to a deposit that might so be dated. What can be done then? Here we present results of investigations at a small rockshelter in Jawoyn Country, in the centralwestern part of the Arnhem Land plateau. Since its art cannot be directly dated, we follow a different path. In the first instance, we aim to understand the history, and antiquity, of the decorated rock surfaces, since the exposed surfaces of the boulder have undergone repeated transformations over a long time. Determining when now-decorated rock surfaces were formed can give us maximum possible ages for the art, since we can date when the surface first was available. Taken with related archaeological evidence from deposits, such as ochre fragments with signs of use, we can arrive at some indications for the age of the art, or at least how the range of possible dates is constrained. This approach is akin to that used at other sites in Jawoyn Country (see Chapters 11 and 15)

Many rodent-borne pathogens can be transmitted via their ectoparasites to humans and can cause severe zoonotic diseases (e.g. plague, tick-borne encephalitis, typhus). Managing relevant ectoparasites in rodents may reduce human infection risk. The purpose of this laboratory study was to screen potential insecticides for their palatability to commensal rat species and their efficacy against fleas and ticks feeding on rats. The preferences shown by Norway rats (Rattus norvegicus) for four insecticides (fipronil, cythioate, thiamethoxam and ivermectin) were assessed when presented as a choice in cereal-based pellets. Subsequently, specific doses of insecticide-containing cereal pellets were fed to rats to determine the ability of each insecticide, over time, to kill cat fleas (Ctenocephalides felis), stickfast fleas (Echidnophaga gallinacea) feeding on Norway rats, and possum ticks (Ixodes trichosuri) feeding on Norway rats and black rats (R. rattus). Fipronil, cythioate and thiamethoxam were similarly palatable to rats, but ivermectin was avoided at high concentration. Fipronil was the most effective in killing cat fleas, stickfast fleas and ticks feeding on rats. Cythioate and ivermectin performed similarly against two flea species, while the effects of ivermectin and fipronil were comparable against ticks. Cythioate was not efficacious against ticks at the doses tested. Fipronil should be tested as a systemic compound to minimise arthropod infestation in small mammals to reduce adverse effects of arthropod-borne disease on humans. This insecticide should also be tested in combination with a rodenticide to prevent migration of arthropods with zoonotic relevance from rodent carcasses to humans.

The Nusa Tenggara island chain consists of an archipelago that runs roughly east-west in eastern Indonesia. As part of Wallacea, it has never been connected to any continental landmass, and has been subject to a variety of biological invasions that have populated the islands. Here, we examine the craniometric and molecular genetic records of several species of Rattus sensu lato in the island chain. We use the predictions of expanding population edge phenotypic selection in an effort to understand the movement of Rattus rattus and Rattus exulans through the archipelago. We also examine the mitochondrial haplotype networks of R. argentiventer, R. exulans, and the R. rattus Complex (RrC) and microsatellite allele frequency clustering patterns for the RrC, to examine relationships within and between Nusa Tenggara populations, and those of Asia and the Pacific where relevant for each taxon. In the RrC LIV and RrC LII haplotype networks, 20 haplotypes with seven from Nusa Tenggara were observed for RrC LIV, and 100 haplotypes with seven from Nusa Tenggara observed for RrC LII. The top performing RrC craniometric model had a negative association between size and distance from the easternmost point of the samples from Nusa Tenggara, consistent with increasing size moving west to east. The cytochrome b network for the R. exulans sequences comprised 14 haplotypes, with three observed from mainland Southeast Asia, one shared with Nusa Tenggara and regions further east, and another haplotype observed in Nusa Tenggara and in the Pacific. The R. exulans craniometric model selection produced four equally well performing models, with no migration scenario preferred. Finally, the haplotype network of R. argentiventer comprised 10 haplotypes, with six observed in Nusa Tenggara, including a relatively early cluster from the east of the archipelago. Our results are compatible with a polyphasic and polydirectional invasion of Nusa Tenggara by Rattus, likely beginning with RrC from the west to the east, an expansion of R. exulans from Flores, seemingly in no preferred overall direction, and finally the invasion of R. argentiventer from the east to the west. We find some support for the Dong Son drum maritime exchange network contributing to the distribution of the latter species.

This paper describes the faunal record from a late Holocene archaeological site located on the freshwater wetlands of the South Alligator River and compares it with that from the Adelaide River, in the Northern Territory. The information characterizes freshwater wetland resources and their use by Aboriginal people, providing a snapshot of life on the floodplains immediately prior to European contact. Although the two wetland systems appear similar, and extractive technology in the form of bone points is also similar, the faunal assemblages show that Aboriginal hunting strategies differed between the two areas. These differences can be explained by variations in regional topography and seasonality of site use.

The resource-poor, isolated islands of Wallacea have been considered a major adaptive obstacle for hominins expanding into Australasia. Archaeological evidence has hinted that coastal adaptations in Homo sapiens enabled rapid island dispersal and settlement; however, there has been no means to directly test this proposition. Here, we apply stable carbon and oxygen isotope analysis to human and faunal tooth enamel from six Late Pleistocene to Holocene archaeological sites across Wallacea. The results demonstrate that the earliest human forager found in the region c. 42,000 years ago made significant use of coastal resources prior to subsequent niche diversification shown for later individuals. We argue that our data provides clear insights into the huge adaptive flexibility of our species, including its ability to specialize in the use of varied environments, particularly in comparison to other hominin species known from Island Southeast Asia. There has been substantial debate of how hominins colonized Australasia through Wallacea, including their ability to utilize marine vs. terrestrial resources. Here, Roberts et al. use stable carbon and oxygen isotopes to reconstruct temporal shifts in the diets of early human inhabitants of Alor and Timor.

Skeletal growth rates reconstructed from bone histology in extinct insular hippopotamids, elephants, bovids and sauropods have been used to infer dwarfism as a response to island conditions. Limited published records of osteocyte lacunae densities (Ot.Dn), a proxy for living osteocyte proliferation, have suggested a slower rate of bone metabolism in giant mammals. Here, we test whether insularity might have affected bone metabolism in a series of small to giant murine rodents from Timor. Ten adult femora were selected from a fossil assemblage dated to the Late Quaternary (~5000-18 000 years old). Femur morphometric data were used in computing phylogenetically informed body mass regressions, although the phylogenetic signal was very low (Pagel's λ=0.03). Estimates of body weight calculated from these femora ranged from 75 to 1188 g. Osteocyte lacunae densities from histological sections of the midshaft femur were evaluated against bone size and estimated body weight. Statistically significant (P < 0.05) and strongly negative relationships between Ot.Dn, femur size and estimated weight were found. Larger specimens were characterized by lower Ot.Dn, indicating that giant murines from Timor might have had a relatively slow pace of bone metabolic activity, consistent with predictions made by the island rule. © 2020 The Linnean Society of London, Biological Journal of the Linnean Society.