10,000 years of human predation and size changes in the owl limpet (Lottia gigantea) on San Miguel Island,California

To investigate potential human impacts on California Channel Island shellfish stocks over the past 10,000 years, we measured 1718 owl limpet shells from 19 archaeological components on San Miguel Island. Inhabiting the middle intertidal zone of Pacific Coast rocky shores, owl limpets are slow-growing mollusks that can live for 30 years and reach lengths of over 100 mm. Recent ecological studies indicate that owl limpets are highly susceptible to heavy human predation, which results in reduced mean shell sizes among Lottia populations along the coasts of Alta and Baja California. On San Miguel Island, we identified a significant trans-Holocene reduction in mean owl limpet size, beginning more than 6500 years ago and accelerating at least 4400 years ago. Fluctuations in limpet size show no clear correlation with changes in sea surface temperature and marine productivity, suggesting that increased predation by growing human populations was primarily responsible for the reduction in Lottia size over time. Our results provide further evidence that prehistoric peoples significantly influenced nearshore fisheries long before the development of the commercial and industrialized fisheries of historic times.     

Correcting temporal frequency distributions for taphonomic bias

In this paper, we expand upon a prior study [Surovell, T.A., Brantingham, P.J., 2007. A note on the use of temporal frequency distributions in studies of prehistoric demography. Journal of Archaeological Science 34, 1868–1877.] that explored the problem of taphonomic bias. Taphonomic bias refers to the tendency for younger things to be over-represented relative to older things in the archaeological record due to the operation of destructive processes like erosion and weathering. Using a database of radiocarbon dated volcanic deposits from Bryson, R.U., Bryson, R.A., Ruter, A. [2006. A calibrated radiocarbon database of late Quaternary volcanic eruptions. Earth Discussions 1, 123–124.], we develop an empirical model of taphonomic bias. In contrast to our prior study in which we modeled taphonomic bias as an exponential function wherein the likelihood of site loss remains constant through time, we argue that the probability of site destruction actually decreases with site age. We further demonstrate how this model can be used to correct temporal frequency distributions and extract demographic histories. We illustrate this approach using databases of radiocarbon dates from rockshelter and open-air sites in the Bighorn Basin, Wyoming, USA, and mammoths and humans in Siberia, Russia.     

The Oral History Project: Connecting Students to Their Community, Grades 4-8

The Oral History Project describes a middle school project thatbegan with a statewide effort to improve students’ languagearts achievement scores. Pennsylvania educators proposed anintegrative instructional model that would involve adolescentsin intergenerational interviews. Teachers implemented the modelin a variety of settings. This book represents Pennsylvaniaeducators’ attempt to share the integrative intergenerationalinterview model with others. Donald Graves, a nationally known expert in language arts educationand author of the Foreword, asserts the instructional modelrepresented in The     

The diversity of North American projectile-point types,before and after the bow and arrow

Mimicking paleobiological studies of biodiversity, changes in the diversity of temporal types of North American projectile points are modeled to reveal evolutionary patterns of origination and extinction. Origination is modeled as rapid innovation of multiple point types (high diversity), and extinction is modeled as gradual winnowing of less-efficient types. Introduction of the bow and arrow as a new weapon-delivery system is modeled as an increase in point diversity. Six sequences of points (dart + arrow), six sequences of dart points, and six sequences of arrow points from western North America best match the model when the number of time periods ?5 and the number of types is >3.     

Through the eyes of rural notaries: business, community and confessional divisions in seventeenth-century poitou

Historians have often reflected upon the relations between Catholicsand Protestants in the small towns of seventeenth-century France.Using the recorded information on the lives and business dealingsof notaries, this article looks at how they integrated intoand dealt with both confessional groups in the small Poitoutown of Chef-Boutonne. Of the twenty-one men who listed themselvesas notaries in the parish registers, seven left records of theacts they drew up. Using their papers as well as parish registersthe article follows up on these men, their religious affiliation,families, marriages, training as notaries, business dealingsand their selection as godparents for town children. It thenreflects back upon the role of these men and their respectiveconfessional groups in the crucial years between the end ofthe Wars of Religion and the lead-up to the revocation of theEdict of Nantes.