Max-Planck-InstitutNews
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News/Press releases
Contact: Sandra Jacob (e-mail: info@[>>> Please remove the brackets! <<<]eva.mpg.de, phone: +49 (0) 341-3550 122)
For the first time, scientists have succeeded in extracting and analyzing Neandertal chromosomal DNA preserved in cave sediments
Until now, researchers required bones or teeth to access the full suite of genetic information from Neandertals, including the chromosomal DNA stored in the cell nucleus, but such fossil remains are rare. In this new study, Benjamin Vernot and colleagues from the Max Planck Institute for Evolutionary Anthropology retrieved Neandertal nuclear DNA from cave deposits in northern Spain and southern Siberia, yielding new clues to the population history of Neandertals. At the Spanish site, only one Neandertal fossil had been recovered in excavations, but Neandertal DNA was found throughout the cave deposits, revealing the replacement of one population by another around 100 thousand years ago. With the advent of nuclear DNA analyses of sediments, similar studies at other sites can provide new insights into the deep human past that do not rely on the discovery of bones and teeth.
The chest beats given by adult male gorillas reliably indicate their body size
The gorilla chest beat is one of the most emblematic sounds in the animal kingdom, even working its way into our informal speech signifying overblown advertisement of one’s own achievements. However, until recently it was unclear what information gorillas were conveying when they gave these impressive displays. A team of international researchers show that chest beats reliably indicate the body size of the chest beater. Body size indicates competitive ability in gorillas. Therefore this information is likely to be crucial for rival males as well as females in influencing mate choice.
Ancient genomes shed new light on the earliest Europeans and their relationships with Neandertals
An international research team has sequenced the genomes of the oldest securely dated modern humans in Europe who lived around 45,000 years ago in Bacho Kiro Cave, Bulgaria. By comparing their genomes to the genomes of people who lived later in Europe and in Asia the researchers from the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, show that this early human group in Europe contributed genes to later people, particularly present-day East Asians. The researchers also identified large stretches of Neandertal DNA in the genomes of the Bacho Kiro Cave people, showing that they had Neandertal ancestors about five to seven generations back in their family histories. This suggests that mixture with Neandertals was the rule rather than the exception when the first modern humans arrived in Europe.
The fossil skull of a woman in Czechia has provided the oldest modern human genome yet reconstructed, representing a population that formed before the ancestors of present-day Europeans and Asians split apart
In an article published in Nature Ecology & Evolution, an international team of researchers analyses the genome of an almost complete skull first discovered in Zlatý Kůň, Czechia in the early 1950s and now stored in the National Museum in Prague. The segments of Neanderthal DNA in its genome were longer than those of the Ust’-Ishim individual from Siberia, the previous oldest modern human sequenced, suggesting modern humans lived in the heart of Europe more than 45,000 years ago.
Link to press release (MPI-SHH)
A genome sequence from a modern human skull over 45,000 years old from Zlatý kůň in Czechia
On April 1, 2021, the Max Planck Institute for Evolutionary Anthropology and the Zoo Leipzig celebrate 20 years of research at the Wolfgang Köhler Primate Research Center (aka Pongoland).
Scientists in the Department of Comparative Cultural Psychology at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, study how great apes perceive and understand their environment. In twenty years, the researchers, first under the leadership of Director Michael Tomasello and since 2019 under the leadership of Director Daniel Haun, have made many new and important insights into the cognitive abilities of our closest relatives.
Researchers develop a low-cost and fast method to detect a COVID-19 infection from a pool of gargle lavage samples
In order to monitor and contain the spread of SARS-CoV-2 it is necessary to test large numbers of people on a regular basis in decentralized settings. Researchers of the Max Planck Institute for Evolutionary Anthropology and the Hospital St. Georg in Leipzig, Germany, have developed improved protocols for the detection of SARS-CoV-2. The method can detect a positive sample in a pool with 25 uninfected samples in less than one hour.
A new large-scale study uncovers recent genetic connectivity between chimpanzee subspecies despite past isolation events
Much like us, chimpanzees, occupy diverse habitats and exhibit extensive behavioural variation. Human genetic variation however changes along a gradient, with no races and some areas of local genetic adaptation. Chimpanzees, on the other hand, are divided into four subspecies separated by geographic barriers like rivers. Previous studies attempting to understand chimpanzee population histories have been limited either by a poor geographic distribution of samples, samples of uncertain origin or different types of genetic markers. Due to these obstacles, some studies have shown clear separations between chimpanzee subspecies while others suggest a genetic gradient across the species as in humans.
Integrating evidence from genetics and archaeology resarchers shed light on East Asia's population history
East Asia today harbours more than a fifth of the world’s population and some of the most deeply branching modern human lineages outside of Africa. The archaeological record attests that this region was also one of the earliest centers of animal and plant domestication. However, its genetic diversity and deep population history remain poorly understood relative to many other parts of the world. In a new study, a team of international researchers analyzes genome-wide data for 166 ancient individuals spanning 8,000 years and 46 present-day groups, and provides insights into the formation of East Asian populations.
Neandertal gene variants both increase and decrease the risk for severe Covid-19
Last year, researchers at the Max Planck Institute for Evolutionary Anthropology in Leipzig and at Karolinska Institutet in Sweden showed that the major genetic risk factor for severe Covid-19 is inherited from Neandertals. Now the same researchers show, in a study published in PNAS, that Neandertals also contributed a protective variant. Half of all people outside Africa carry a Neandertal gene variant that reduces the risk of needing intensive care for Covid-19 by 20 percent.
Strong social bonds increases the willingness to join others in battle
Humans cooperate with each other in large groups to defend territories or wage war. But what underlies the evolution of this kind of cooperation? Researchers at the Max PIanck Institute for Evolutionary Anthropology and Harvard University show that there may be a link between social bonds and participation in large-scale cooperation: Chimpanzees join their close bond partners when fighting rivals. In humans, too, social bonds may have been essential to the evolution of cooperative abilities.
Foraging humans, mammals and birds who live in the same place behave similarly
Foraging humans find food, reproduce, share parenting, and even organise their social groups in similar ways as surrounding mammal and bird species, depending on where they live in the world, new research has found. A new study by a team of international researchers shows environmental factors exert an overriding influence on how foraging human populations and non-human species behave, despite their very different backgrounds.
Researchers find that present-day Mariana Islanders’ ancestry is linked to the Philippines
Compared to the first peopling of Polynesia, the settlement of the Mariana Islands in the Western Pacific, which happened around 3,500 years ago, has received little attention. Researchers from the Max Planck Institute for Evolutionary Anthropology, the Australian National University and the University of Guam have now obtained answers to long debated questions regarding the origin of the first colonizers of the Marianas and their relationship to the people who initially settled in Polynesia.
Heidi Colleran, leader of the Max Planck Research Group BirthRites - Cultures of Reproduction at the Max Planck Institute for Evolutionary Anthropology in Leipzig (Germany), and Alexander Andrason from Stellenbosch University (RSA) will be main co-investigators in the MULTILING-HIST project led by PI Justyna Olko (University of Warsaw, Poland).
The European Research Council has announced the winners of its latest Consolidator Grant competition. Among them is Justyna Olko from the Faculty of “Artes Liberales” of the University of Warsaw who has received funding for implementing the MULTILING-HIST project (“Multilingual worlds – neglected histories. Uncovering their emergence, continuity and loss in past and present societies”). The project addresses the complex, multi-level dimensions of historical and contemporary multilingualism, focusing on its emergence, continuity, reduction and loss.
Link to press release (University of Warsaw)
List of researchers selected for funding (social sciences and humanities)
The Max-Planck-Institute in Leipzig is part of a new platform for online child studies
Parents and their children can now take part in studies while sitting comfortably at home with a laptop or tablet in front of them. The new website www.kinderschaffenwissen.de is a unique platform for online studies covering developmental, psychological research questions from many scientific institutions in Austria, Germany, and Switzerland.
The QUANTA project is the first concerted effort to address the ambitious questions of when, why, and how tools for quantification emerged and evolved
The creation and use of numeral systems is a defining feature of humans, but the prehistoric origin of these systems and the cognitive skills they require are poorly understood. With funding from the European Research Commission, QUANTA will bring together four leading researchers to examine these challenging questions.
Scientists identify 34,000-year-old Early East Asian of mixed Eurasian descent
In a new study, researchers at the Max Planck Institute for Evolutionary Anthropology in Germany and the Mongolian Academy of Sciences present an analysis of the genome of the oldest human fossil found in Mongolia to date. They show that the 34,000-year-old female inherited around 25 percent of her DNA from western Eurasians, demonstrating that people moved across the Eurasian continent shortly after it had first been settled by the ancestors of present-day populations. The study also shows that this individual as well as a 40,000-year-old individual from China carried DNA from Denisovans, an extinct form of hominins that inhabited Asia before modern humans arrived.
Integration of contributors promotes the quantity and quality of data
Biodiversity loss is continuing relentlessly worldwide. In order to counteract this more effectively, monitoring programmes are needed which precisely map the circumstances of animal and plant species and the extent to which they are under threat. But too often, these are still inadequate – the range of species examined is not extensive enough, and there is too little coordination. A team of researchers led by the German Centre for Integrative Biodiversity Research (iDiv) describes, in an article for the scientific journal One Earth how different stakeholders can combine their data and expertise to improve monitoring and thus counteract further species loss.
A segment of DNA that causes their carriers to have an up to three times higher risk of developing severe Covid-19 is inherited from Neandertals
Covid-19 affects some people much more severely than others. Some reasons for this such as old age are already known, but other as yet unknown factors also play a role. This summer, a large international study linked a group of genes on chromosome 3 to a higher risk of hospitalisation and respiratory failure upon infection with the Sars-CoV-2 virus. Researchers at the Karolinska Institutet in Sweden and the Max Planck Institute for Evolutionary Anthropology in Germany have now analysed the gene cluster.
The award for outstanding research contributions and achievements concerning human origins and evolution will be presented on September 25, 2020 by the Accademia Nazionale dei Lincei
Professor Johannes Krause, director of the Department of Archaeogenetics at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, has won the “Fabio Frassetto” International Prize for Anthropology from the Accademia Nazionale dei Lincei. The award will be presented at the Closing Ceremony of the Academic Year 2019-2020 on 25 September 2020. Due to the ongoing Covid-19 pandemic, this year’s awards ceremony will be held in virtual format.
Neandertals have adopted male sex chromosome from modern humans
An international research team led by Martin Petr and Janet Kelso of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, has determined Y chromosome sequences of three Neandertals and two Denisovans. These Y chromosomes provide new insights into the relationships and population histories of archaic and modern humans, including new evidence for ancient gene flow from early modern humans into Neandertals. The data show that Neandertals may have benefited from these interactions as the gene flow resulted in the complete replacement of the original Neandertal Y chromosomes by their early modern human counterparts.
Male chimpanzees who lose their mother early in life are less competitive and have fewer offspring than sons who continue to live with their mothers
One of the greatest traumas we face is for our parents to die when we are children. Orphans can continue to suffer negative consequences of parental loss for the rest of their lives, including losing out on growth and health. New research shows that, like humans, chimpanzee offspring stay with their mothers until they are teenagers, after they are 12 years old. A series of new studies shows that orphaned chimpanzees also lose out on growth and survival. A new study in Science Advances from the Taï Chimpanzee Project in Ivory Coast and the Max Planck Institute for Evolutionary Anthropology in Leipzig, shows that in addition, orphaned sons are less competitive and have fewer offspring of their own than those who continue to live with their mothers. The remaining puzzle is, what is it that their mothers provide that keeps chimpanzees healthy and competitive?
Both historical and recent variation in ecological and environmental conditions are associated with larger behavioural repertoires in wild chimpanzees
Chimpanzee behavioural and cultural diversity has been well documented across equatorial Africa, however, the ecological-evolutionary mechanisms are not yet understood. An international team led by the Max Planck Institute for Evolutionary Anthropology and the German Centre for Integrative Biodiversity Research (iDiv) has investigated the influence of environmental variability on the behavioural repertoires of 144 social groups. The scientists found that chimpanzees living further away from historical forest refugia, under more seasonal conditions, and found in savannah woodland rather than closed forested habitats, were more likely to exhibit a larger set of behaviours.
An 80,000-year-old Neanderthal reveals cultural and genetic affinities between Poland and the Northern Caucasus
A new study by an international team reports the oldest mitochondrial genome of a Neanderthal from Central-Eastern Europe. The mitochondrial genome of the tooth, discovered at the site of Stajnia Cave in Poland, is closer to a Neanderthal specimen from the Caucasus than to the contemporaneous Neanderthals of Western Europe. Stone tools found at the site are also analogous to the southern regions suggesting that Neanderthals living in the steppe/taiga environment had a broader foraging radius than previously envisaged. The Prut and Dniester rivers were probably used as the main corridors of dispersal from Poland to the Caucasus.
Evidence-based conservation is key to curb primate population declines
Less than one percent of scientific literature on primates evaluate the effectiveness of interventions for the conservation of primates. That is the result of a new study compiled by a team of experts in 21 countries, led by researchers from the German Centre for Integrative Biodiversity Research (iDiv), Martin Luther University Halle-Wittenberg (MLU), Max Planck Institute for Evolutionary Anthropology (MPI-EVA) and the University of Cambridge. Despite great protection efforts, this is one of the main reasons for the dramatic decline of the populations of primate species. The study proposes several actions to improve the evidence base for the conservation of primates.
People who inherited a special ion channel from Neandertals experience more pain
Pain is mediated through specialized nerve cells that are activated when potentially harmful things affect various parts of our bodies. These nerve cells have a special ion channel that has a key role in starting the electrical impulse that signals pain and is sent to the brain. According to a new study by researchers at the Max Planck Institute for Evolutionary Anthropology in Germany and the Karolinska Institutet in Sweden people who inherited the Neandertal variant of this ion channel experience more pain.
Disease prevention and protection of species require differentiated strategies
Extensive wildlife trade not only threatens species worldwide but can also lead to the transmission of zoonotic diseases. It encompasses hundreds of species with significant differences in their conservation status and associated disease risk. However, current strategies to mitigate the wildlife trade often neglect these differences. An international research team led by the Max Planck Institute for Evolutionary Anthropology and the German Centre for Integrative Biodiversity Research shed new light on the motivations why people hunt, trade or consume different species. The research shows that more differentiated solutions are needed to prevent uncontrolled disease emergence and species decline.
When informing about a threat territorial chimpanzees are more motivated to cooperate than less territorial bonobos
Humans are unique in their abilities to cooperate in very large groups and help people outside their family and even complete strangers. What promoted the evolution of such sophisticated cooperative skills is highly debated. Scientists investigated cooperation dynamics in wild chimpanzees (Taï, Ivory Coast) and bonobos (LuiKotale, DCR) using a snake model. While chimpanzees cooperate to defend their territory, bonobos do not. The study reveals no differences in both species’ social intelligence but supports theories linking territoriality and in-group cooperation in humans since chimpanzees were more motivated to cooperate by informing others of a threat as compared to bonobos.
Researchers are studying the Neandertal DNA found in modern humans using stem cells and organoids
Protocols that allow the transformation of human induced pluripotent stem cell (iPSC) lines into organoids have changed the way scientists can study developmental processes and enable them to decipher the interplay between genes and tissue formation, particularly for organs where primary tissue is not available. Now, investigators are taking this technology and applying it to study the developmental effects of Neandertal DNA.
Neandertals may have lived in very small groups, and genes expressed in the basal ganglia of their brains may have changed
Until now, only the genomes of two Neandertals have been sequenced to high quality: one from Vindjia Cave in modern-day Croatia and one from Denisova Cave in Siberia’s Altai Mountains. A research team led by Svante Pääbo from the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, has now sequenced the genome of a third Neandertal whose remains were found - 106 kilometres away from the latter site - in Chagyrskaya Cave.
MPI-EVA in Leipzig and MPI-SHH in Jena enter into a major reorganization – Leipzig to be retained as hub for ancient genetics, Jena to create novel research profile
Two successful sister institutes within the Humanities and Social Sciences Section of the Max Planck Society with the common theme of the evolutionary history of humankind – the MPI for Evolutionary Anthropology in Leipzig and the MPI for the Science of Human History in Jena – will enter into a major phase of restructuring in the coming years to create optimized research clusters in human biological and cultural evolution at both sites. Several upcoming retirements at the MPI in Leipzig and a partially overlapping research agenda between the two institutes in Leipzig and Jena have led the Max Planck Society to reorganize both in order to stake out a clear vision for the future of the two institutes.
High levels of emotionality and conscientiousness are indicators for stockpiling behavior
People who feel more threatened by COVID-19 and rank highly on scales of emotionality and conscientiousness were most likely to stockpile toilet paper in March 2020, according to a new study by Theo Toppe of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, and colleagues.
Female chimpanzees are also important in helping to win and keep a territory
In humans, warfare and territoriality seem to be a male "business". Chimpanzees, with whom we share this propensity for out-group hostility and territoriality, are thought to follow the same gender difference. This vision may be too simplistic, as suggested by an international team of researchers from the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany. They extensively studied several neighboring groups of western chimpanzees and their findings reveal that females and even the entire group may play a more important role in between-group competition than previously thought. They found that even though adult males seem important in territory increase, territory maintenance and competitive advantage over neighbors act through the entire group in this population of chimpanzees in the Taï National Park.
Neandertal progesterone receptor has a favourable effect on fertility
One in three women in Europe inherited the receptor for progesterone from Neandertals – a gene variant associated with increased fertility, fewer bleedings during early pregnancy and fewer miscarriages. This is according to a study published in Molecular Biology and Evolution by researchers at the Max Planck Institute for Evolutionary Anthropology in Germany and the Karolinska Institutet in Sweden.
Chimpanzees need more than five years to acquire key skills
Development is slow in many primates, particularly so in humans, as key skills needed for survival and successful reproduction have to be acquired. In one of human’s closest living relatives, the chimpanzee, there is surprisingly little data on developmental processes. Researchers from the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, have now systematically investigated developmental milestones in wild chimpanzees of the Taï National Park (Ivory Coast) and found that they also develop slowly, requiring more than five years to reach key motor, communication and social milestones. This timeframe is similar to humans, suggesting slow maturation of the brain.
Chimpanzee groups each have their own unique termite fishing cultures
The transmission of cultures from generation-to-generation is only found in a few species besides humans. Chimpanzees are one such species and exhibit a large diversity of cultural and tool use behaviours. Although these behaviours have been well documented at a handful of long term research sites, the true cultural repertoire of chimpanzees across populations is still poorly understood. To better understand this diversity, researchers at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, initiated the ‘Pan African Programme: The Cultured Chimpanzee’ (PanAf) in 2010. Using a standardized protocol, researchers set up camera traps, collected samples and recorded ecological data at over 40 temporary and long-term research sites across Africa.
Major cultural transition in Europe took place earlier than previously thought
An international research team reports new Homo sapiens fossils from the site of Bacho Kiro Cave in Bulgaria. These fossils are directly dated to approximately 45,000 years ago and in direct association with stone tools, the remains of hunted animals, bone tools, and personal ornaments. The new discoveries document the earliest known Upper Paleolithic Homo sapiens and push back in time the start of this major cultural transition in Europe. Their stone tools unearthed at the site link Bacho Kiro Cave to finds across Eurasia as far east as Mongolia.
Researchers genotyped more than 20 ethnic groups in Vietnam, encompassing all five major language families in Mainland Southeast Asia
The genetic diversity of Vietnam has remained relatively unexplored and previous studies suggested a largely indigenous origin of the Vietnamese. A new study led by Dang Liu and Mark Stoneking from the Max Planck Institute for Evolutionary Anthropology in Leipzig, with colleagues from the Vietnam Academy of Science and Technology, found evidence for extensive contact, over different time periods, between Vietnamese and other groups.
Researchers analyzed the genomes of more than 27.000 Icelanders to find out which parts of our genomes contain Neandertal DNA
When the ancestors of modern humans left Africa 50,000 years ago they met the Neandertals. In this encounter, the Neandertal population contributed around two percent of the genome to present day non-African populations. A collaboration of scientists from Aarhus University in Denmark, deCODE Genetics in Iceland, and the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, have conducted the most comprehensive study to date using data obtained from 27,566 Icelanders, to figure out which parts of our genomes contain Neandertal DNA and what role it plays in modern humans.
For many weeks now, social interactions have been prohibited in many countries, which has affected many people. Roman Wittig of the Max Planck Institute for Evolutionary Anthropology in Leipzig, has been looking into the effects of social contacts on the health of chimpanzees, and some of his findings apply equally to humans. In this interview, he explains why he prefers to speak in terms of "spatial” rather than “social” distancing, and how virtual (online) meetings can replace real meetings to a certain extent.
New fossils indicate that Homo erectus existed earlier than previously thought, at a time when also Australopithecus and Paranthropus were around close-by
In a new paper published in Science this week, an international team of scientists including a researcher from the Max Planck Institute for Evolutionary Anthropology in Leipzig described, dated and contextualized new hominin fossils from Drimolen Main Quarry in South Africa. A two-million-year-old partial neurocranium shows that Homo erectus existed 100,000 to 200,000 years earlier than thought and shared the landscape in this region of South Africa with two other types of hominins – Australopithecus sediba and Paranthropus robustus.
Three million year old brain imprints show that Australopithecus afarensis infants may have had a long dependence on caregivers
A new study led by paleoanthropologists Philipp Gunz and Simon Neubauer from the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, reveals that Lucy’s species Australopithecus afarensis had an ape-like brain. However, the protracted brain growth suggests that – as is the case in humans – infants may have had a long dependence on caregivers.
A new study has found evidence that human ancestors as recent as two million years ago may have regularly climbed trees
Walking on two legs has long been a defining feature to differentiate modern humans, as well as extinct species on our lineage, from our closest living ape relatives: chimpanzees, gorillas and orangutans. This new research, based on analysis of fossil leg bones, provides evidence that a hominin species - believed to be either Paranthropus robustus or early Homo - regularly adopted highly flexed hip joints; a posture that in other non-human apes is associated with climbing trees.
The ratio of special zinc isotopes in dental enamel provides information about the diet of mammals in prehistoric times
Paleodietary studies of the fossil record are impeded by a lack of reliable and unequivocal tracers, currently making it impossible to determine the exact timing of dietary changes or, often, even the species involved. Scientists from the Max Planck Institute for Evolutionary Anthropology in Leipzig, the Max Planck Institute for Chemistry in Mainz and the Johannes Gutenberg University in Mainz have now tested a new method, the isotope analysis of zinc isotopes from the tooth enamel of fossil mammals. They found this method to be well suited to expand our knowledge about the diets of fossil humans and other Pleistocene mammals. The method proves especially useful when it comes to differentiating whether prehistoric mammals had mainly animal or plant based food on the menu.
Brain imprints on cranial bones from great apes and humans refute the long-held notion that the human pattern of brain asymmetry is unique
The left and right side of the brain are involved in different tasks. This functional lateralization and associated brain asymmetry are well documented in humans, but little is known about brain asymmetry in our closest living relatives, the great apes. Using endocasts (imprints of the brain on cranial bones), scientists now challenge the long-held notion that the human pattern of brain asymmetry is unique. They found the same asymmetry pattern in chimpanzees, gorillas, and orangutans. However, humans were the most variable in this pattern. This suggests that lateralized, uniquely human cognitive abilities, such as language, evolved by adapting a presumably ancestral asymmetry pattern.
Geneticist Svante Pääbo honoured for his work into human origins
Svante Pääbo, Director at the Max Planck Institute for Evolutionary Anthropology in Leipzig, is the founder of palaeogenetics, a research discipline concerned with the analysis of genetic samples from fossils and prehistoric finds. Which of the genetic changes that occurred in the course of evolutionary history make up modern man is what Pääbo studies by comparing the DNA sequences of modern-day humans, Neanderthals and other human ancestors. His groundbreaking research has now earned him the Japan Prize, which is endowed with mit 50 million Yen (approx. 490,000 euros).
Mothers may be shaping pre-adult growth and offspring muscle mass even without direct provisioning
Like humans, young chimpanzees associate with their mothers all the way into adulthood. Unlike in humans, offspring no longer depend on maternal food sharing beyond the weaning age. Therefore, the reasons for and consequences of these years of post-weaning mother-offspring associations are unclear. Using long-term behavioural and hormonal data from wild chimpanzees in the Taï Forest, Côte d’Ivoire, researchers from the Taï Chimpanzee Project at the Max Planck Institute for Evolutionary Anthropology, have revealed that mothers may be shaping pre-adult growth and offspring muscle mass even without direct provisioning. We compared growth of young chimpanzees with a mother until adulthood compared to those who had experienced maternal loss after weaning.
Female chimpanzees’ reproductive success decreases in times of strong territorial conflict with other groups
Territorial conflicts can turn violent in humans and chimpanzees, two extremely territorial species. An international team of researchers from the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, has studied the effects of territoriality on female reproductive success in wild Western chimpanzees and found that high neighbor pressure at times when females typically reproduce can lead to reproductive delays with longer intervals between births. Having many males in a group, however, is of advantage and speeds up reproduction.
