Where and How: Stone Tool Sites of the Endangered Sapajus flavius in a Caatinga Environment in Northeastern Brazil DOI Open Access
Maria Gabriella Rufino, José Nilton da Silva, João Pedro Souza‐Alves

et al.

American Journal of Primatology, Journal Year: 2024, Volume and Issue: 87(1)

Published: Dec. 11, 2024

The blonde capuchin monkey (Sapajus flavius) was, until a few years ago, an endemic primate of the Atlantic Forest. Today, populations inhabit Caatinga dry forest and these have been documented using stone tools to access encased foods. It is important know distribution sites characteristics inform conservation actions for this in Caatinga. To end, we identified characterized tool used by group monkeys northeastern Brazil. For 8 months, walked two pre-existing trails georeference use sites, measure dimensions weight anvils hammerstones, identify food items processed at sites. A total 215 247 hammerstones were mapped. significantly longer than while there was no difference width. Most remains found on old (n = 101; 91%). Cnidoscolus quercifolius 85; 77.3%) Prunus dulcis 25; 22.7%) most common among plant species anvils. width, thickness, crack fruits P. greater those C. quercifolius. These results should be as baseline development habitat.

Language: Английский

Stone Tool Use by Black‐Horned Capuchin Monkeys (Sapajus nigritus cucullatus) in an Urban Park in Londrina, Brazil DOI Open Access
Julia dos Santos Gutierres, Felipe dos Santos Machado Pereira, Jessica W. Lynch

et al.

American Journal of Primatology, Journal Year: 2025, Volume and Issue: 87(1), P. 87 - 1

Published: Jan. 1, 2025

Tool use to crack open palm nuts has been observed extensively in some capuchin monkey species. However, for southern black-horned monkeys (Sapajus nigritus cucullatus), there is only one published record of stone tool from the 1990s, an urban park Londrina, Brazil. In present study, we returned this systematically investigate hammer-and-anvil sites used by population. We analyzed fruit and shell remnants resulting hammering test following hypotheses: (1) hammers at tool-use are actively chosen size and/or weight, (2) that closer a tree processed plant species more frequently used, (3) no seasonal effect modulating processing nuts. located identified 205 through active search within park, measured weighed tools involved activity. compared hammer weight comparable material available environment found differed significantly raw materials environment, suggesting choice hammers. three which were use: Syagrus romanzoffiana, Acrocomia aculeata Terminalia catappa. Through measuring distance between each site nearest there, proximity target (Syagrus Acrocomia) increased cracking frequency. times during study year determine if new activity had occurred, our data indicate habitual throughout year, with large differences seasons.

Language: Английский

Citations

2
Nut-cracking success and efficiency in two wild capuchin monkey populations DOI Creative Commons
Tiago Falótico,

Amanda C. Macedo,

Matheus A. de Jesus

et al.

Royal Society Open Science, Journal Year: 2024, Volume and Issue: 11(6)

Published: June 1, 2024

Capuchins can employ several strategies to deal with environmental challenges, such as using stone tools access encapsulated resources. Nut-cracking is customary in capuchin populations and be affected by ecological cultural factors; however, data on success efficiency are only known for two wild populations. In this work, camera traps, we assessed palm nut-cracking newly studied bearded ( Sapajus libidinosus ) compared them other sites. We tested the hypothesis that overall of would similar between sites when processing resources, finding partial support it. Although hammerstones different sizes, capuchins had a frequency. However, (number strikes crack nut) was different, one population being more efficient. also whether varied sexes adults. predict adult males successful efficient cracking hard nuts. found no differences site but sex other, although low-resistant nut, which unexpected. Our add knowledge behaviour flexibility, variance potential traits.

Language: Английский

Citations

5
Wild capuchin monkeys use stones and sticks to access underground food DOI Creative Commons
Tatiane Valença, Gabriela Oliveira Affonço, Tiago Falótico

et al.

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: May 6, 2024

Abstract Primates employ different tools and techniques to overcome the challenges of obtaining underground food resources. Humans chimpanzees are known tackle this problem with stick one population capuchin monkeys habitually uses stone tools. Although early hominids could have used stones as digging tools, we know little about when how these be useful. Here, report a second primate observed using first monkey use ‘stick-probing’ technique for The bearded ( Sapajus libidinosus ) from Ubajara National Park, Brazil, ‘hands-only’ ‘stone-digging’ extracting storage organs trapdoor spiders. Males also ‘stone-stick’ capturing Tool does not increase success in Stone-digging is less frequent than only other that technique. Females lower proportion their episodes males both populations. Ecological cultural factors potentially influence choice sex differences within between This has pattern exploration Comparing others exploring ecological under which will allow us better understand pressures may shaped evolution those behaviors primates.

Language: Английский

Citations

4
Characterization of Stone Tool Use in Wild Groups of Critically Endangered Yellow‐Breasted Capuchin Monkeys (Sapajus xanthosternos) DOI Creative Commons
Rayssa Mainette Nantes Durães, Jessica W. Lynch, Patrícia Izar

et al.

American Journal of Physical Anthropology, Journal Year: 2025, Volume and Issue: 186(2)

Published: Feb. 1, 2025

ABSTRACT Objectives A hallmark of hominin evolution is the advent and diversification stone tool use, biological anthropologists have a particular interest in characterizing use behaviors different species. Robust capuchins, genus Sapajus , are an excellent convergent model system for understanding evolution, principally context foraging, terms how they stones to process hard fruits. However, most published studies capuchin wild focus on species libidinosus . In order strengthen comparative analyses, it important do research across robust understand capacities variation genus. The first indirect evidence that reported S. xanthosternos was 2009, but since time no additional publications described this behavior study we provide complete characterization two areas within Montes Claros, Minas Gerais state, Brazil: Santa Rosa de Lima district, Lapa Grande State Park. We compare our findings characteristics other monkey Materials Methods monthly surveys from January September 2018, walked trails through categorized site characteristics, including anvil area, height, perimeter; hammer weight; fruit utilized. Additionally, utilized camera traps at high‐use sites. Results describe tools used by 169 sites clustered seven Nutcracking Areas, processing three encased fruit: Macaúba ( Acrocomia aculeata ), Cansaçao Cnidoscolus pubescens Guariroba Syagrus oleracea ). With traps, directly observed Discussion displayed patterns very similar those main difference regards physical force; study, mean weight higher than field sites; however, there between when hammering Macaúba. also registered heaviest (7.675 kg) known It clear capacity conserved radiation extant suggesting possible cognitive spanning up 3.3 million years Unlike occurring throughout year nutcracking only during dry season.

Language: Английский

Citations

0
Predatory attack on a bearded capuchin monkey by a Boa constrictor DOI Creative Commons
Tatiane Valença,

Emiliane Cardoso,

Tiago Falótico

et al.

Primates, Journal Year: 2025, Volume and Issue: unknown

Published: April 15, 2025

Abstract Predation influences foraging strategies, as primates must avoid being preyed on while feeding. Some populations of capuchin monkeys are the only neotropical that customarily use ground for nut-cracking. This time-consuming and focus-demanding activity may increase susceptibility to predation events. However, there is currently no data in tool-using Sapajus populations. We report a snake’s ( Boa constrictor ) predatory attack bearded monkey S. libidinosus population, well other monkeys’ alarm calling threat displays. confirm these vulnerability discuss how they balance requirements with risk.

Language: Английский

Citations

0
Where and How: Stone Tool Sites of the Endangered Sapajus flavius in a Caatinga Environment in Northeastern Brazil DOI Open Access
Maria Gabriella Rufino, José Nilton da Silva, João Pedro Souza‐Alves

et al.

American Journal of Primatology, Journal Year: 2024, Volume and Issue: 87(1)

Published: Dec. 11, 2024

The blonde capuchin monkey (Sapajus flavius) was, until a few years ago, an endemic primate of the Atlantic Forest. Today, populations inhabit Caatinga dry forest and these have been documented using stone tools to access encased foods. It is important know distribution sites characteristics inform conservation actions for this in Caatinga. To end, we identified characterized tool used by group monkeys northeastern Brazil. For 8 months, walked two pre-existing trails georeference use sites, measure dimensions weight anvils hammerstones, identify food items processed at sites. A total 215 247 hammerstones were mapped. significantly longer than while there was no difference width. Most remains found on old (n = 101; 91%). Cnidoscolus quercifolius 85; 77.3%) Prunus dulcis 25; 22.7%) most common among plant species anvils. width, thickness, crack fruits P. greater those C. quercifolius. These results should be as baseline development habitat.

Language: Английский

Citations

0