Agricultural potential and actualized development in Hawai’i: an airborne LiDAR survey of the leeward Kohala field system (Hawai’i Island)

Archaeological investigations of Hawaiian agriculture have relied on relatively coarse-grained data to investigate archipelago-wide processes, or on fine-grained data to examine patterning within localized zones of agricultural production. These trade-offs between spatial coverage and data resolution have inhibited understanding of both spatial patterns and temporal trends. Our analysis of 173 km² of high-resolution airborne Light Detection and Ranging (LiDAR) data for leeward Kohala, Hawai’i Island identifies spatial and temporal patterning in regional agricultural development. Differential densities of alignments suggest variable levels of agricultural intensity. Agricultural processes of expansion, segmentation, and intensification can also be discriminated, with distinct zones of the field system having undergone different mixes of development. Areas within the field system with moderate to high levels of both average production and variability in production (determined using a climate-driven productivity model) were utilized relatively early in a highly intensified manner; these areas often underwent processes of segmentation and intensification. Less productive areas were developed later and exhibit evidence of expansion with lower amounts of segmentation and intensification, at set levels of intensity. The spatial and temporal variability in agricultural activities was influenced by the diverse environmental conditions across the landscape as well as variation in cultivars and cultivation techniques. Combining the high-resolution LiDAR data from a large area with potential productivity modeling allows for a more fine-grained understanding of agricultural development in this region of the Hawaiian archipelago.     

Shelly fauna from the Cambrian (Miaolingian,Guzhangian) Shannon Formation and the SPICE event in the Amadeus Basin,Northern Territory

Smith, P.M., Brock, G.A. & Paterson J.R. 20 September 2019. Shelly fauna from the Cambrian (Miaolingian, Guzhangian) Shannon Formation and the SPICE event in the Amadeus Basin, Northern Territory. Alcheringa 44, 1–24. ISSN 0311-5518

A low-diversity assemblage of linguliformean brachiopods, hyoliths, molluscs, bradoriid arthropods and echinoderms (ten taxa in total) is documented from the upper Shannon Formation (Cambrian, Miaolingian, Guzhangian; Mindyallan) in the Ross River Syncline and Todd River Anticline area, NE Amadeus Basin, central Australia. Taxa described include: the linguliformean brachiopods Treptotreta jucunda Henderson & MacKinnon, 1981, Opisthotreta sp., Stittia? sp., an undetermined acrotretid and an undetermined linguloid; the molluscs Kobayashiella? heritagensis Webers, Pojeta & Yochelson, 1992 (a paragastropod), and Apoptopegma joyceae sp. nov. (a rostroconch); the bradoriid Mongolitubulus sp.; Hyolithida gen. et sp. indet.; and isolated echinoderm plates. All fauna (including previously documented trilobites) from the upper Shannon Formation disappear at the beginning of a ～5‰ positive shift in δ¹³C, identified as the Steptoean Positive Isotopic Carbon Excursion (SPICE). Despite previous links between SPICE and a global extinction, as well as the disappearance of all faunal elements in the uppermost Shannon Formation, certain taxa reported herein range through the event elsewhere in the world. The occurrence of Treptotreta jucunda and Kobayashiella? heritagensis in younger (Furongian) deposits indicates these species survived the SPICE extinction event. This study advocates for more systematic and comprehensive sampling through stratigraphic intervals where the SPICE event occurs, especially for range data of complete faunas (rather than individual taxonomic groups), to facilitate a more complete picture of diversity trends through this important phase.

P.M. Smith* [patrick.smith@austmus.gov.au], Palaeontology Department, Australian Museum Research Institute, Sydney, New South Wales, 2010, Australia; G.A. Brock [glenn.brock@mq.edu.au], Department of Biological Sciences, Macquarie University, Sydney, New South Wales, 2109, Australia. J.R. Paterson [jpater20@une.edu.au], Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England, Armidale, New South Wales, 2351, Australia. *Also affiliated with: Department of Biological Sciences, Macquarie University, Sydney, New South Wales, 2109, Australia.     

Late Quaternary ostracods from Lake George,New South Wales

Fossil ostracods from the uppermost 3m of core LG4 from Lake George all have modern living representatives. This part of the core is thought to represent deposition during the last 60,000 years (see Singh et al., 1981b) and the lake hisotry is traced from a knowledge of the ostracod ecology.

The following distinct phases, and their respective timing, are postulated for Lake George (the timing of events should be considered with caution as few ¹⁴C dates are available): water fresh and lake full for the periods of 10,200 – 12,000 yBP and 19,100 – 20,700 yBP, water fresh, ephemeral at times, for the periods of 3,200–4,000 yBP, 7,000 yBP, 7,500 yBP, 8,500–10,200 yBP, 12,000–13,500 yBP, 20,700–23,500 yBP, 23,800–27,600 yBP and at some stage between 27,000 and 60,000 yBP; ephemeral saline water for a few short episodes between 3,200 and 4,000 yBP and for the periods of 15,600–17,400 yBP and 23,800–27,600 yBP; lake definitely dry between 17,400 and 19,100 yBP.

Data obtained from the ostracods correlate reasonably well with those of lake level fluctuations based on the study of ancient shorelines by Coventry (1976) and others based on facies analyses and the record of plant microfossils by Singh et al. (1981b).     

Religion,the state,and the Vietnamese lunar new year (Respond to this article at http://www.therai.org.uk/at/debate)

This article examines the ways in which the Communist Party and the state in Vietnam have become involved in the annual lunar new year (Tet) festival in the name of the nation, and with how this is facilitated by the ancestor cult and linked to their more general involvement in religious events such as the commemoration of national heroes and deities.     

The return of cities: the trajectory of Swiss cities from demographic loss to reurbanization

ABSTRACT

Reurbanization refers to the new demographic growth of cities that previously lost population. How can we explain such a trend reversal? This paper discusses theoretically both phases of urban decline and reurbanization. It examines the trajectory of Swiss cities that have moved from a period of decline (1970–2000) to a new growth (since 2000). It analyses the components behind the population evolution, discusses the socio-cultural, economic and political trends triggering or enabling reurbanization, and identifies three main results. First, reurbanization is due to several population groups: the growing international mobility of the labour force, the increasing number of non-family households (in the context of the second demographic transition) and the growing attractiveness of cities for young adults (extension of youth as a life stage). Second, reurbanization is not only housing-led (construction of dwellings due to planning strategies and real estate activities). It is also population-led: A generation replacement induces a rejuvanation of the age structure and an increase in the density of occupancy of dwellings. Third, reurbanization can be broadly interpreted as a return of cities in terms of residential aspirations, political agenda and real estate activities. As a conclusion, I outline a research agenda on reurbanization.     

Geospatial modeling of pre-contact Hawaiian production systems on Molokaʻi Island,Hawaiian Islands

The geographic distribution and relative importance of traditional agricultural systems in Hawai?i, based on ethnohistoric and archeological data, is only partially understood. Knowledge of the size and distribution of these systems is critical in estimating island populations, production, and surplus, as well as for assessing societal dynamics and the sustainability of indigenous agricultural systems. We employ geospatial modeling using rainfall, elevation, soil type, streamflow, slope, and substrate age, to create a geographic information system (GIS) model for the distribution of four major production systems on Moloka?i Island – intensive pondfield irrigation, intensive dryland cropping, extensive colluvial slope agriculture, and fishpond aquaculture. Model results were checked against archaeological data sets for known areas, testing for goodness of fit between model predictions and empirical field evidence. Our model predicts that Moloka?i could have sustained 9.52 km² of irrigated pondfields, 7.98 km² of intensive dryland systems, and 18.5 km² of colluvial slope agriculture. Fishponds are estimated to have yielded 17.98 metric tons of fish protein per year. The total agricultural production for the island is calculated to be 41,490 metric tons per year (wet weight), with pondfield, dryland, and slope systems yielding 46, 17, and 37 percent of total production respectively. Our results indicate that colluvial slope cultivation, which has been largely ignored in previous studies, was a major contributor to Hawaiian agricultural production, especially on the geologically older islands. Pondfield irrigation and colluvial slope systems had higher caloric efficiency than intensive dryland field systems, providing greater surplus to labor ratios in areas with abundant land suitable to irrigation and slope cultivation. Surplus discrepancies likely influenced population distribution as well as sociopolitical dynamics between districts and among neighboring islands. The model has applicability to the entire Hawaiian archipelago and to other islands in Polynesia, where it may be used to estimate pre-contact agricultural production and carrying capacities, two main factors influencing pre-contact social and political dynamics in Hawai?i and other island groups.     

Non-marine ostracods from two Quaternary profiles at Pulbeena and Mowbray Swamps,Tasmania

Two spring-fed swamp deposits in northwestern Tasmania which contain non-marine ostracods are characterized by an alternation of marl, peaty marl and peaty layers: the Pulbeena Swamp deposit (4.80 m thick) was formed over approximately the last 80,000 years, and Mowbray Swamp (2 m thick) over about the last 110,000 years. Fifteen ostracod species have been recovered from 179 samples: three are new, three are in open nomenclature and the others have living representatives.

The ostracod data compared with pollen curves for both sites demonstrate, for most levels, a good correlation between the abundance of ostracods and that of Cyperaceae and Potamogeton-Triglochin pollen. This implies that ostracods can be successfully used as indicators of different water regimes for spring-fed swamps. Comparison of the ostracod fauna from the two Tasmanian sites is also made with that of other known Australian and New Zealand swamp deposits.