Eric J. Guiry

• PhD
• Lecturer in Biomolecular Archaeology at University of Leicester

Stable carbon and nitrogen isotope data from the bone collagen of human remains excavated in the Sado Valley in the Alentejo region of Portugal provide evidence for the existence of two Mesolithic communities living in close proximity along the shores of an estuarine environment with significantly different diets. These findings add to the limited...

(Rattus spp.) bone collagen stable isotope values are often assumed to reflect an average of food stuffs that were available to archaeological populations. This paper considers the feasibility of using stable isotope evidence from rat remains as a source of proxy information for human food-related social, economic, and sensorial behaviors. First, a...

From the 16th century onward, various European nations shared fishing spaces off the coast of Newfoundland in an effort to provide salt-fish products to supplement increasing European demand. Faunal remains excavated at seasonal and permanent Newfoundland fishing stations indicate that pigs were the primary mammal species consumed by cod fishermen....

Prior to burning down in 1906 CE, Point Alones in the Monterey Bay region of Central California was home to one of the largest Chinese fishing communities in the United States of America. Both historical records and the recovery of numerous cartilaginous fish (Chondrichthyes) vertebrae during archaeological excavations of the village indicate shark...

While the impacts of black ( Rattus rattus ) and brown ( Rattus norvegicus ) rats on human society are well documented—including the spread of disease, broad-scale environmental destruction, and billions spent annually on animal control—little is known about their ecology and behavior in urban areas due to the challenges of studying animals in city...

On behalf of the organizing committee, we are happy to announce that the 22nd ICAZ Fish Remains Working Group meeting will be held in Toronto, Canada, from 12 to 17 August, 2024. These dates are inclusive of the post-conference field trip. Conference sessions will run from August 12 to 15, with the field trip occurring on August 16 and 17. More det...

Domesticated cattle were brought to Ireland during the Neolithic. By the early medieval period, 4000 years later, these animals were central to social and economic status in Irish communities and the landscape was organised around cattle husbandry to a degree unattested elsewhere in Europe. How this socio-economic importance developed is unclear. H...

More than a century of archaeological work in Ontario and surrounding areas has resulted in a massive quantity of archaeological data and collections, much of which has been subject to relatively limited analyses. For the past several years, our research team has been working on (re-)analyzing legacy faunal collections to understand past subsistenc...

This study outlines a method for exploring pig husbandry in coastal fishing communities in Iceland after the eleventh century when pig keeping is commonly thought to have disappeared from the island. Analyses focus on determining relative origin (i.e., locally raised versus imported) of pork products consumed at the nineteenth-century Icelandic fis...

This is a draft 'best practices' document for zooarchaeology in Ontario.

Sulfur isotope (δ³⁴S) analyses are an important archaeological and ecological tool for understanding human and animal migration and diet, but δ³⁴S can be difficult to interpret, particularly in archaeological human-mobility studies, when measured isotope compositions are strongly ³⁴S-depleted relative to regional baselines. Sulfides, which accumula...

Sample MixSIAR Code Hillis D, McKechnie I, Guiry E, St. Claire DE, Darimont CT. 2020. Ancient Dog Diets on the Pacific Northwest Coast: Zooarchaeological and Stable Isotope Modelling Evidence from Tseshaht Territory and Beyond. Scientific Reports 10: 15630 https://doi.org/10.1038/s41598-020-71574-x

The passenger pigeon (Ectopistes migratorius) was once the most abundant bird species in North America. Flocks of these birds witnessed in the early 19th century were so vast that they were said to darken the sky for days as they passed. Early syntheses of passenger pigeon remains in archaeological contexts in the eastern United States, in contrast...

The short-tailed albatross (Phoebastria albatrus) is a threatened seabird whose present-day range encompasses much of the North Pacific. Within this species, there are two genetic clades (Clades 1 and 2) that have distinctive morphologies and foraging ecologies. Due to a global population collapse in the late 19th and early 20th centuries, the freq...

Research on the evolution of dog foraging and diet has largely focused on scavenging during their initial domestication and genetic adaptations to starch-rich food environments following the advent of agriculture. The Siberian archaeological record evidences other critical shifts in dog foraging and diet that likely characterize Holocene dogs globa...

This study uses isotopic analyses to explore how new railroad transportation systems influenced Chinese diaspora meat sourcing and animal husbandry in the nineteenth-century American West. Isotopic compositions of animal bone collagen (n=224) demonstrate tremendous dietary diversity for pigs and chickens, across both C3-to-C4 and omnivory continuum...

Theory and field studies suggest that long-term individual foraging site fidelity (IFSF) may be an important adaptation to competition from increasing population. However, the driving mechanisms and extent of long-term IFSF in wild populations of long-lived, migratory animals has been logistically difficult to study, with only a few confirmed insta...

The carbon (δ¹³C) and nitrogen (δ¹⁵N) isotopic compositions of bone and tooth collagen provide a powerful tool for studying past biological, environmental, and cultural phenomena. Collagen has a well-understood chemical composition that has enabled the development of invaluable quality control (QC) criteria for isotopic data – something that is ext...

Fisheries encompass complex interplays between social, economic, and environmental factors, but limitations on historical fisheries data can hamper efforts to identify and contextualize the long-term spatiotemporal patterns that shape them. We integrate 2500 years of stable isotope (δ34S, δ13C, and δ15N) and zooarchaeological evidence from Gulf of...

Resource depression and garden hunting are major topics of archaeological interest, with important implications for understanding cultural and environmental change. Garden hunting is difficult to study using traditional zooarchaeological approaches, but isotopic analyses of animals may provide a marker for where and when people exploited nondomesti...

Saltmarshes are tremendously important culturally and ecologically because they can provide abundant nutrient-rich fodder for grazing livestock, with relatively little resource investment. They also perform critical ecological services, including detoxifying water and stabilizing coastlines. For these reasons, methods for investigating the nature a...

Analysis of individual animal bodies can provide numerous useful insights in archeology, including how humans provisioned such animals, which in turn informs on a variety of other past behaviors such as human dietary patterns. In this study, we conducted stable carbon (δ 13 C) and nitrogen (δ 15 N) isotope analysis of collagen and keratin from four...

Domestic dogs are frequently encountered in Indigenous archaeological sites on the Northwest Coast of North America. Although dogs depended on human communities for care and provisioning, archaeologists lack information about the specific foods dogs consumed. Previous research has used stable isotope analysis of dog diets for insight into human sub...

This study investigates the nature of diet in a predominantly Late Medieval Gaelic Irish skeletal population and explores whether any sex-based and/or age differences were evident in the population. A smaller sub-sample was also examined to determine whether there was any evidence for dietary change over time between the Early Medieval (c.700–c.120...

Sled dogs were an integral part of Labrador Inuit life from the initial expansion and settlement of northeastern Canada to the present day. Tasked with pulling sleds and assisting people with other subsistence activities in the winter, dogs required regular provisioning with protein and fat. In this paper, we conduct stable carbon and nitrogen isot...

Isotopic analyses of collagen, the main protein preserved in subfossil bone and tooth, has long provided a powerful tool for the reconstruction of ancient diets and environments. Although isotopic studies of contemporary ecosystems have typically focused on more accessible tissues (e.g. muscle, hair), there is growing interest in the potential for...

RATIONALE : Stable sulfur isotope compositions (δ ³⁴S values) are a useful marker of terrestrial (lower δ ³⁴S) versus marine (higher δ ³⁴S) diets. In coastal areas, ³⁴S‐enriched sea spray can obscure these marine/terrestrial differences. We sought to establish whether δ ³⁴S values of sea spray‐affected terrestrial fauna can be distinguished from th...

Prior to their extirpation around 1900 CE, Lake Ontario hosted the world’s largest freshwater Atlantic salmon (Salmo salar) fishery. Due to their early disappearance, questions remained about fundamental aspects of the species’ biology, such as whether they belonged to sea-run (anadromous) or freshwater resident (potamodromous) ecotypes. Recent iso...

The ability to distinguish between different migratory behaviours (e.g., anadromy and potamodromy) in fish can provide important insights into the ecology, evolution, and conservation of many aquatic species. We present a simple stable carbon isotope (δ¹³C) approach for distinguishing between sockeye (anadromous ocean migrants) and kokanee (potamod...

Prior to European settlement, Indigenous peoples sustainably harvested Atlantic salmon (Salmo salar) and lake trout (Salvelinus namaycush) from Lake Ontario for centuries. Previous studies have suggested Indigenous peoples were able to maintain the productivity of Atlantic salmon and lake trout fisheries in the Great Lakes region through the use of...

Isotopic studies of archived fish scales have tremendous potential to develop long-term retrospectives that provide important insights into how humans have altered aquatic ecosystems. However, fish specimens in museum archives and other repositories typically date to time periods when the impacts of industrial societies may have already caused prof...

Despite the longstanding significance of North America's Great Lakes, little is known about their preindustrial ecology. Here, we report on when and how humans first became a main driver of Lake Ontario's nutrient dynamics. Nitrogen isotope analyses of archaeological fish show that, prior to the 1830s, Lake Ontario's nitrogen cycle and the trophic...

The decline of passenger pigeons (Ectopistes migratorius) during the late nineteenth century continues to draw substantial public and scientific attention as perhaps the most (in-)famous extinction event in North America's recent history. While humans undeniably caused the extinction, the relative importance of indirect (habitat destruction) versus...

Sixteen taxa comprising extinct megafauna and extant species from a single asphalt deposit (Project 23, Deposit 1) at Rancho La Brea were isotopically analyzed (δ¹³C, δ¹⁵N, δ³⁴S) and ¹⁴C dated to investigate paleoecology and feeding behavior of terrestrial vertebrates in southern California during the late Pleistocene. The large majority of the ¹⁴C...

Stable carbon and nitrogen isotope analyses of human and animal tissues have become an important means of studying both anthropogenic and natural food webs in aquatic ecosystems. Within the rapidly expanding field of human and animal paleodietary analyses, archaeologists routinely incorporate isotopic data from fish, birds, and aquatic mammals into...

During the Late Woodland period in what is now the Canadian province of Ontario, Indigenous peoples met their nutritional needs through a combination of maize horticulture, gathering, hunting, and fishing. Recent research on stable isotopes in human tissue (Pfeiffer et al. 2016) suggests that the protein component in the diet of one of the groups o...

Changing social and economic practices had an important role for human adaptive strategies in colonial contexts and sometimes had profound consequences for emerging societies. This study uses insights from stable-isotope analyses, as well as other historical and archaeological evidence, to investigate the social and economic roles of French animal...

Over the past 1000 years, rats (Rattus spp.) have become one of the most successful and prolific pests in human society. Despite their cosmopolitan distribution across six continents and ubiquity throughout the world's cities, rat urban ecology remains poorly understood. We investigate the role of human foods in brown rat (Rattus norvegicus) diets...

Lineage losses for man's best friend Dogs have been present in North America for at least 9000 years. To better understand how present-day breeds and populations reflect their introduction to the New World, Ní Leathlobhair et al. sequenced the mitochondrial and nuclear genomes of ancient dogs (see the Perspective by Goodman and Karlsson). The earli...

Humans have always affected their ecosystems, but finding evidence for significant and lasting changes to preindustrial landscapes is rare. We report on human-caused changes to the nitrogen cycle in Ireland in the Bronze Age, associated with intensification of agriculture and animal husbandry that resulted in long-term changes to the nitrogen isoto...

The Adriatic Sea and Balkan Peninsula were an important corridor for the spread of agriculture northwards and westwards from the Near East into Europe. Therefore, the pace and nature of the Mesolithic-Neolithic transition along the Adriatic coastline has important implications for the movement of new peoples and/or ideas during one of the most even...

Historical zooarchaeologists have made significant contributions to key questions about the social, economic, and nutritional dimensions of domestic animal use in North American colonial contexts; however, techniques commonly employed in faunal analyses do not offer a means of assessing many important aspects of how animals were husbanded and trade...

Lake Ontario once supported a large complex of Atlantic Salmon (Salmo salar) populations that became extinct prior to scientific study. Since the 1860s, research efforts to conserve and reintroduce a sustainable population of Atlantic Salmon have focused on determining whether Lake Ontario’s original salmon populations had migrated to the Atlantic...

Rationale: Fish bone collagen isotopic measurements are increasingly important in palaeodietary and paleoenvironmental studies yet differences in the chemical and physical properties of fish relative to other vertebrate bones are rarely considered. Lipid content in fish bone, which can exceed 50%, may underlie the poor collagen integrity criteria...

For the past 15 years, a succession of stable isotope studies have documented the abrupt dietary transition from the Mesolithic to the Neolithic in Western and Northern Europe. Portugal, with its Late Mesolithic shell middens and burials apparently coexisting with the earliest Neolithic, further illustrates the nature of that transition. Individual...

A 19th-century dog burial uncovered from a historical homelot in Toronto, Canada, provided a unique opportunity to reconstruct the individual’s osteobiography. Of particular interest are the dog’s very large size and a suite of skeletal pathologies. Recovery of a nearly complete skeleton combined with the use of x-rays and micro-computed tomography...

We radiocarbon dated the domestic dog found associated with La Brea Woman at the Rancho La Brea tar pits (Los Angeles, CA) to determine the validity of this human–dog connection. The domestic dog yielded a radiocarbon age of 3125 ± 25 14C yr BP (3250–3400 cal yr BP) and La Brea Woman had a re-dated age of 9080 ± 15 14C yr BP (10,220–10,250 cal yr B...

A 19th-century dog burial uncovered from a historical homelot in Toronto, Canada, provided a unique opportunity to reconstruct the individual's osteobiography. Of particular interest are the dog's very large size and a suite of skeletal pathologies. Recovery of a nearly complete skeleton combined with the use of x-rays and micro-computed tomography...

In this paper we report on the first 14C dated archaeological seeds from the island of Newfoundland, Canada. Ninety-three archaeobotanical specimens were recovered from a midden deposit adjacent to a small dwelling at Point Riche (EeBi-20), a large Dorset Palaeoeskimo site near Port au Choix, northwestern Newfoundland. These remains were collected...

This paper presents the first use of bone collagen stable isotope analyses for the purpose of reconstructing historical animal husbandry and trade practices in Australia. Stable carbon and nitrogen isotope analyses of 51 domesticate and commensal specimens demonstrate that meats consumed at the mid to late nineteenth-century Commonwealth Block site...

When archaeological human remains are absent or otherwise unavailable for bone chemistry-based paleodietary reconstructions, dog remains may provide an appropriate surrogate material for approximating ancient human diet. This “canine surrogacy approach” (CSA) has developed over the past thirty years and is becoming more common in archaeological sci...

In contexts where human remains are scarce, poorly preserved, or otherwise unavailable for stable isotope-based paleodietary reconstruction, dog bone collagen as well as other tissues may provide a suitable proxy material for addressing questions relating to human dietary practices. Inferences drawn from applications of this “canine surrogacy appro...