Estimating age and season of death of pronghorn antelope (Antilocapra americana Ord) by means of tooth eruption and wear

Age and season of death information for prey animals at archaeological sites can address issues such as season of site occupation and prey hunting or harvesting strategies. Unfortunately, adequate reference information for estimating age and season is lacking for many wild species, including pronghorn antelope. To address this problem, new methods of scoring tooth eruption and wear have been developed and have been applied to a sample of over 500 pronghorn mandibles to obtain improved eruption and wear schedules. One implication of this study is that ‘age class discreteness’ is an unreliable method for demonstrating mass mortality of prey. This study provides a much larger comparative sample than previously available, although larger known‐age mandible samples are still needed for pronghorn and many other wild species. Copyright © 2001 John Wiley & Sons, Ltd.     

Variability in cementum deposition in springbok from the South African Cape

Over the past two decades, cementum increment analysis has played an important role in determining the season of death of ungulates at archaeological sites in many parts of the world, but its potential to address questions of seasonality in South African prehistory has remained largely unexplored. The ability to determine the seasonality of hunting practices would prove an important asset to understanding the foraging strategies and mobility patterns of Middle and Later Stone Age people in this region. A sample of springbok (Antidorcas marsupialis) of known date-of-death was collected from the South African Cape, a region across which three different rainfall regimes are represented. This study documents a very general correspondence between rainfall patterns and cementum development in springbok but also a level of variability that exceeds that observed by studies in other regions. In two sub-samples in which the sex of all individuals is known, cementum deposition among females is more strongly correlated with season of death than it is among males. This difference may reflect the social organization of springbok. The findings for springbok highlight the complexity of applying cementum increment analysis to archaeological studies not only on the Cape but also in regions of similar climatic variability.     

Determining Age and Season of Death by Use of Incremental Lines in Norwegian Reindeer Tooth Cementum

Using incremental patterns in tooth cementum is a powerful tool for age assessment. Recent developments have shown that the method has a large potential as an indicator of the season of death of the individual in question. In this paper, the results of a study comparing thin sections of teeth of the modern Hardangervidda reindeer population to those of Iron Age, eleventh, and thirteenth century reindeer hunting stations from the same area are presented. The tooth wear stages were compared to the actual age of the individual (based on the number of incremental lines and the age at eruption). It was established that in the studied reindeer populations wear stages sometimes result in too low an age estimate. Having identified the start of the period of deposition for rest lines in the modern reindeer population as early autumn and winter, analysis of the outermost layer in the tooth cementum at the archaeological sites points to a prolonged hunting season in the thirteenth century, while in the earlier phases hunters were probably present on fewer and shorter visits.     

Mortality date estimation using fetal pronghorn remains

Pronghorn (Antilocapra americana) fetal remains are sometimes recovered from archaeological contexts. Pronghorn have consistent reproductive schedules so their remains may provide information on seasonality of site occupation and number of mortality events. To investigate the reliability of fetal remains for seasonality and mortality event assessment, bone size and tooth eruption were measured in a sample of modern fetal pronghorn remains with known mortality dates. Results indicate a strong correlation between bone size and mortality date, but no significant correlation between tooth eruption level and mortality date. Fetal bone size was used to estimate a late April or early May mortality date at both the Oyster Ridge (48UT35) and Trappers Point (48SU1006) archaeological sites. The number of mortality events at Trappers Point was also investigated. Copyright © 2007 John Wiley & Sons, Ltd.     

Bison breeding characteristics and interpretation of archaeological seasonality revisited

Bison breeding behaviour has been used for the last three decades as the basis for developing methods for assigning season‐of‐occupation estimates to archaeological sites on the North American Plains. These methods are based upon the supposition that the North American bison breeding season is extremely short and that genetically controlled ontological characteristics such as foetal growth and tooth eruption sequences can therefore be used to infer site seasonality in a reasonably straightforward and precise manner. This paper reviews bison population studies conducted during the past 30 years to reassess present understandings of the length of North American bison breeding seasons. It is concluded that the bison breeding season regularly extends over a period of three to four months, and that initiation of ontological development will therefore also vary over the same period of time. Bison development characteristics cannot provide a reliable or precise means of assigning seasonality to archaeological sites on the North American Plains. It is suggested that methods using physical characteristics such as dental cementum incrementation which are directly affected by seasonal changes could be more productive. Copyright © 2006 John Wiley & Sons, Ltd.     

Polarizing Microscopy Identification of Chemical Diagenesis in Archaeological Cementum

Cementum increment analysis can potentially retrieve relatively complete, high-precision seasonality and mortality profiles from archaeological mammalian tooth assemblages. However, cementum exhibits many similarities to bone in composition, histology, ultrastructure, and even microstructure. Consequently, the mineralized dental tissue may be prone to the same processes of post-depositional chemical alteration that affect bone. This article reviews the issues surrounding chemical diagenesis in cementum and presents a new application to archaeological ungulate cementum of a polarizing microscopy technique that has previously been utilized to identify the effects of chemical diagenesis in archaeological bone and human cementum (Geusa et al., 1999; Gilbert, 1989; Watson, 1975; Zeder, 1978). It is argued that the post mortem leaching of collagen and the diagenetic growth of apatite crystallites can develop into banded features that mimic seasonal cementum increments. This pattern of diagenesis is demonstrated in multiple locations on a macroscopically well-preserved Upper Pleistocene-age archaeological tooth, which was previously interpreted by the author to exhibit biogenic seasonal cementum increments (Stutz, 1993; Stutz et al., 1995). It is suggested that if researchers seek to retrieve seasonality and mortality data from archaeological cementum, the microscopy analysis protocol must include screening of a pilot sample for the frequency and extent of chemical diagenesis.     

A deciduous and permanent dental wear stage system for assessing the age of Trachypithecus sp. specimens (Colobinae, Primates)

Although Colobine monkeys are one of the most common prey hunted by Southeast Asian prehistoric humans, no data concerning tooth eruption and wear are available for these species. Dental wear eruption and attrition are used for attributing ages to individual fossils in order to construct mortality curves, and are also useful in reconstructing fossil life histories. Such wear sequences partly exist for Cercopithecines. Although Cercopithecines and Colobines are both bilophodont, they present significant differences in terms of diet, detailed tooth morphologies and occlusion. This paper aims to formulate a guide for the dental eruption and attrition of extant Trachypithecus specimens, the most folivorous of all the Colobines. We also propose to calibrate the eruption and wear stages that we define here with absolute ages available in the literature.     

DIGITAL CEMENTUM LUMINANCE ANALYSIS AND THE HAUA FTEAH HOMININS: HOW SEASONALITY AND SEASON OF USE CHANGED THROUGH TIME*

The importance of environmental seasonality and the seasonal cycling of resources to human populations make studies of human responses to seasonality useful to test hypotheses about short‐ and long‐term changes in human behaviour. This paper utilizes digital dental cementum luminance analysis in order to better understand patterns of the seasons of death of Ammotragus lervia at Haua Fteah, Cyrenaica, and to test whether long‐term climatic changes can be detected in dental cement. The overall pattern of the season of death of A. lervia at Haua Fteah is that of year‐round utilization, with a slight increase over time in A. lervia use during the growth period/summer time. The use of digital cementum luminance analysis (DCLA) to detect changes in the seasonal differences between temperatures indicates a trend for increased seasonality in temperature over the past 40 000 years at Haua Fteah. Furthermore, DCLA patterns in the more recent assemblages indicate a shift to a warmer climate from Marine Oxygen Isotope Stage (MIS) 3 to MIS 1.     

THERA, SULPHUR, and CLIMATIC ANOMALIES

Summary: A major climatic 'event'is known from the 17th century BC, and some scientists and archaeologists have sought to associate it with the large Late Bronze Age eruption of the Thera volcano in the Aegean. Sulphur production is the key to the climatic impact of a volcanic eruption, and petrologic estimates of the sulphur production of the Thera eruption appeared to show that it was far too small to have caused the climatic event, and, in particular, the 17th century BC sulphuric acid spike in a Greenland ice-core. However, study of recent eruptions demonstrates that petrologic estimates can be very significant under-estimations, and so the Theran sulphur production may have been much greater than presently thought. Therefore Thera is again a candidate as the cause of the 17th century BC climatic disturbances, and, from current chronometric evidence, perhaps the best candidate. Further multi-parameter chronometric research could very soon enable possibilities and probabilities to become more definite.     

The use of stable isotope ratio analysis to distinguish multiple prey kill events from mass kill events

Archaeologists working with prey animal bonebeds are interested in determining whether the animals were obtained through a single, mass kill event or instead accumulated over time from multiple hunting events. This is often difficult to determine. The author investigated the use of stable isotope ratio analysis to distinguish accumulations of individuals derived from multiple populations from mass kills of individuals from a single population. Carbon, oxygen and strontium stable isotope ratios were measured in tooth enamel from modern pronghorn (Antilocapra americana) with known mortality circumstances. These ratios were then analyzed using basic statistical methods as well as a scaled distance technique that permits integrated analysis of multiple isotopes and multiple samples, and a bootstrap subsampling approach was used to quantify differences among populations. It appears that, in some circumstances, stable isotope analysis can contribute to distinguishing bonebeds originating as accumulations of individuals derived from multiple populations from mass kills of individuals from a single population. Three-element isotope ratio distance measures provide the best isotopic indicator of pronghorn bonebed population origins, especially when bootstrap subsampling is used to compare to sites of known pronghorn population composition.     

Dama Dentition: A New Tooth Eruption and Wear Method for Assessing the Age of Fallow Deer (Dama dama)

Reliable ageing techniques for wild animals are notoriously challenging to develop because of the scarcity of sizeable collections of known‐age specimens. Without such techniques it is difficult to reconstruct hunting patterns, which is a significant problem for the examination of assemblages from pre‐farming cultures. This paper presents a new method, based on mandibular tooth eruption and wear, for assessing the age of fallow deer. The method was developed from a large collection (n = 156) of known‐age Dama dama specimens, has been blind tested by members of the zooarchaeological community and represents a user‐friendly system with the potential to generate large compatible datasets through which the dynamics of human–Dama relationships can be examined. Copyright © 2016 John Wiley & Sons, Ltd.     

Some Evidence for Seasonality amongst Later Stone Age Hunter-gatherers in Southern Africa

Abstract

The Later Stone Age (LSA) period in Southern Africa is characterised by a succession of cultural traditions. The LSA hunter-gatherer populations were ancestral to the present-day San. They moved around in small bands, within a semi-fixed territory visiting open air and shelter sites to coincide with available resources.

The hunter-gatherers filled every niche in the environment, including the high mountains, deserts and semi-deserts, bush savanna and grass lands. They were well aware of the food sources available in their territories during the course of a year and utilized these opportunities. As winters in southern Africa are relatively mild, and most regions have foods available throughout the year, seasonality is difficult to demonstrate.

In only a few instances there is some evidence for seasonal use or seasonality. Age profiles of seals at Elands Bay Cave suggest short occupation periods during late winter and early spring. In the high mountains of South Africa and Lesotho, where winters are cold and frost and snow common, the faunal and floral remains suggest occupation during late spring, summer and early autumn. Abbot's Cave in the semi-arid central Karoo was used as a hunting lodge during September, relating to the lambing season and migratory behaviour of springbok (Antidorcas marsupialis).     

Sea bird fowling in southern Patagonia: a contribution to understanding the nomadic round of the Canoeros Indians

As well as providing data on meat yield, avian remains can be expected to give information on seasonality, an important parameter for understanding prehistoric hunting economies. An archaeological survey conducted in the Skyring Sea (Province of Magellan, Chile) between 1992 and 1994 provided bird bone assemblages that have been analysed with this aim in mind, of which 12 are discussed here. Cormorants and steamer ducks constitute 97 per cent of the specimens identified. The proportions of avian remains are compared with the mammals remains, and mostly show a predominance of the former. The status and seasonal distribution of animal resources are discussed in order to understand the motivation for such a specialization on bird hunting, when mammals (Artiodactyls and Pinnipeds) can bring a much higher yield of meat. This nomadic marine economy can best be understood when comparisons are made with other sites from the same cultural area. © 1997 John Wiley & Sons, Ltd.     

High-resolution sclerochronological analysis of the bivalve mollusk Saxidomus gigantea from Alaska and British Columbia: techniques for revealing environmental archives and archaeological seasonality

The butter clam, Saxidomus gigantea, is one of the most commonly recovered bivalves from archaeological shell middens on the Pacific Coast of North America. This study presents the results of the sclerochronology of modern specimens of S. gigantea, collected monthly from Pender Island (British Columbia), and additional modern specimens from the Dundas Islands (BC) and Mink and Little Takli Islands (Alaska). The methods presented can be used as a template to interpret local environmental conditions and increase the precision of seasonality estimates in shellfish using sclerochronology and oxygen isotope analysis. This method can also identify, with a high degree of accuracy, the date of shell collection to the nearest fortnightly cycle, the time of day the shell was collected and the approximate tidal elevation (i.e., approx. water depth and distance from the shoreline) from which the shell was collected.Life-history traits of S. gigantea were analyzed to understand the timing of growth line formation, the duration of the growing season, the growth rate, and the reliability of annual increments. We also examine the influence of the tidal regime and freshwater mixing in estuarine locations and how these variables can affect both incremental structures and oxygen isotope values. The results of the sclerochronological analysis show that there is a latitudinal trend in shell growth that needs to be considered when using shells for seasonality studies.Oxygen isotope analysis reveals clear annual cycles with the most positive values corresponding to the annual winter growth lines, and the most negative values corresponding to high temperatures during the summer. Intra-annual increment widths demonstrate clear seasonal oscillations with broadest increments in summer and very narrow increments or no growth during the winter months. This study provides new insights into the biology, geochemistry and seasonal growth of S. gigantea, which are crucial for paleoclimate reconstructions and interpreting seasonality patterns of past human collection.     

Comparing methods for analysing mortality profiles in zooarchaeological and palaeontological samples

In this study, I examine three methods that are currently used for comparing mortality profiles from zooarchaeological and palaeontological samples: (1) histograms with 10% of life‐span age classes; (2) boxplots showing tooth crown height medians; and (3) triangular plots of the proportions of young, prime and old animals. I assess the advantages and disadvantages of each method using data collected on two samples of Northern Yellowstone elk (Cervus elaphus nelsoni) with known, or cementum annuli‐determined, ages at death. One sample was hunted by wolves (n = 96), and the other was hunted by recent humans using rifles (n = 226). I tested each method with the known or cementum annuli age distributions and with age estimation techniques appropriate for archaeological assemblages. Histograms are best used when the relationship between dental eruption/attrition and age is well established so that individuals can be confidently assigned into 10% of life‐span groups, and when more than 30 or 40 individuals are present in the assemblage. Boxplots employ raw crown heights, thus removing the error introduced by assigning specimens to age classes, and therefore they allow the analysis of species where the relationship between dental eruption/attrition and age is unknown. Confidence intervals around the medians allow samples to be statistically compared. Triangular plots are easy to use and allow multiple samples and species to be considered simultaneously, but samples cannot be statistically compared. Modified triangular plots bootstrap samples to provide 95% confidence ellipses, allowing for statistical comparisons between samples. When possible, samples should be examined using multiple methods to increase confidence in the results. Copyright © 2005 John Wiley & Sons, Ltd.     

Seasonality and age structure in an archaeological assemblage of Sika deer (Cervus nippon)

Sika deer (Cervus nippon) was one of the major terrestrial mammals hunted in Japan throughout the Jomon period, which extends from the end of the Palaeolithic until the arrival of rice agriculture in the first millennium bc . Mandibular analysis of hunted deer is believed to be more useful in determining the season of death than antlers in archaeological contexts. This paper aims to present a new method of estimating an occupational season of a Jomon site by using sika deer mandibles. This method consists of two stages. First, two measurements on a mandible should be taken. If the distribution shows any gaps among young juveniles, this strongly suggests that the sika was hunted in a specific season. Second, tooth eruption and attrition stage should be observed; this may suggest the season in which hunting took place. This method was utilized to analyse sika deer remains from Awashimadai in eastern Kanto. The result of the analysis shows that deer were hunted only from spring to summer at Awashimadai. Putting these results together with the estimate of seasonality deduced from other species strongly suggests that the site was occupied only from April to July. This paper also examines how the tooth attrition stages of sika deer progress. The preliminary comparison with red deer (Cervus elaphus) in England suggests that molar wear progresses more quickly in sika than in red deer. Copyright © 1999 John Wiley & Sons, Ltd.     

Preliminary evidence for seasonal deposition patterns from member 2 of the Swartkrans hominid site,South Africa

Frequencies of specimens in juvenile age classes, based on an analysis of tooth eruption and wear sequences, in specimens of an extinct species of springbok, Antidorcas bondi Wells and Cooke, from Member 2 of the Swartkrans hominid site, suggest that the remains of this animal were deposited during summer months. These indications of seasonal activity may offer support for previous suggestions of annual game movements. Such periodic movements have implications for our understanding of the behaviour patterns of the animals, including perhaps the hominids, which are represented in the assemblages from Swartkrans and other sites in the vicinity.     

Prehistoric hunting pressure estimated by the age composition of excavated sika deer (Cervus Nippon) using the annual layer of tooth cement

Age of excavated sika deer was determined not only by the cement-annuli method but also by the observation method to avoid unnecessary destruction of archaeological materials. The observation method is based on tooth replacement, wear index and the appearance of cervical lines on the molar teeth. Stepwise discriminant analysis was used to establish a criterion for the age determination of excavated mandibles. Then the annulation method was carried out for well-preserved specimens older than 3–5 years. The age composition of excavated deer mandibles seems to have changed through the Jomon Period. Age composition at the Torihama sites (the Early Jomon Period) was characterized by an abundance of aged individuals, showing a close similarity with that of the recent deer population under protected conditions. Deer from the Kidosaku and Yahagi sites (the Late Jomon Period) and the SambuUbayama site (the Latest Jomon Period) were composed mainly of deer younger than 5 years, which seems to correspond to that of the recent hunted population living under natural conditions in Hokkaido. These data suggest that the hunting pressure increased during the Late and Latest Jomon Periods and compares with the pressures on recent hunted populations of sika deer.     

Prehistoric Seal Hunting on Lake Baikal: Methodology and Preliminary Results of the Analysis of Canine Sections

A number of archaeological sites on Lake Baikal revealed evidence of Neolithic and Bronze Age seal hunting. A collection of 35 canines from four sites was used to develop a methodology for analysing growth increments of canine dentine for the purpose of examining aspects of prehistoric seal hunting. Results from this preliminary analysis indicate that seal hunting at these sites was a seasonal activity confined to spring and early summer. Baikal seals were probably hunted in early spring for their meat, blubber and furs, and later in the season for their meat and skins.     

Seasonality only works in certain parts of the year: the reconstruction of fishing seasons through otolith analysis

Seasonality estimations using incremental data usually suffer from small sample sizes and from the lack of comparison with sufficiently large modern samples. The present contribution reports on incremental studies carried out on large assemblages of plaice (Pleuronectes platessa) and haddock (Melanogrammus aeglefinus) from a late medieval fishing village (Raversijde, Belgium) on the North Sea coast. In an attempt to refine previous seasonality estimates made for this site, and to expand conclusions concerning general methodology, extensive monthly samples of modern otoliths of these species, caught within the North Sea, have also been investigated. The modern material shows that the timing of the seasonal changes in the edge type (hyaline or opaque) of the otoliths is extremely variable and that it is dependent on the fishing ground, the year considered, and the age of the fish. It also appears that the increase of the marginal increment thickness is highly variable, to such an extent that the thickness of the last increment of a single otolith is mostly useless for seasonality estimation. Where large archaeological otolith assemblages can be studied, preferably from single depositional events, seasonality determination becomes possible on the condition, however, that the archaeological assemblage corresponds to fish that were captured during their period of fast growth. The growth ring study on the otoliths from Raversijde shows that plaice fishing took place in spring and that it was preceded by a haddock fishing season, probably in late winter/early spring. Copyright © 2004 John Wiley & Sons, Ltd.