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Tag: "chimpanzee" at biology news

New collaborative research reveals chimpanzees can sustain multiple-tradition cultures

...high-ranking individuals in four different captive chimpanzee communities. Researchers then observed as those in...de Waal, Dr. Horner and Dr. Bonnie worked with two chimpanzee groups and introduced each to one of two alternative sequences of complex behaviors. The sequences i...

Ancient retrovirus sheds light on modern pandemic

...etrovirus first emerged with the sequencing of the chimpanzee genome. "When the chimp genome was sequenced, a team of scientists at the University of Washington led by Evan Eichler found the largest difference overall between the chimp and human genomes was the presence or absence of PtERV1," Emerman said. "Chi...

Gene mutation linked to cognition is found only in humans

The human and chimpanzee genomes vary by just 1.2 percent, yet there is a c... a longer protein. Introducing this mutation into chimpanzee DNA resulted in the creation of type II neuropsin. "Hence, the human-specific mutation is not only n...

Female-led infanticide in wild chimpanzees

...t of as a male trait. An exception in the realm of chimpanzee behavior was famously noted in the 1970s by Jane G...s the result of new field work involving the Sonso chimpanzee community in Budongo Forest in Uganda, the St. Andrews researchers now report instances of three fem...

Man's best friend lends insight into human evolution

... "Taken together," Hare writes, "the results on chimpanzee cooperation and their use of social cues support the hypothesis that evolution in human social problem solving, much like that of dog social problem solving, occurred after changes in our species' social emotions lifted social constraints." ...

Analysis of rhesus monkey genome uncovers genetic differences with humans, chimps

... the rhesus macaque monkey and aligned it with the chimpanzee and human genomes. Published April 13 in a special section of the journal Science, the analysis reveals that the three primate species share about 93 percent of their DNA, yet have some significant differences among their genes. In its paper, the Rh...

Ebola outbreaks killing thousands of gorillas and chimpanzees

... wild apes. Direct encounters between gorilla or chimpanzee social groups are rare. Therefore, when reports of large ape die-offs first surfaced in the late 1990s, outbreak amplification was assumed to be through "massive spillover" from some unknown reservoir host. The new study, conducted by researchers fro...

The chimpanzee stone age

... site in Cote d'Ivoire, the only known prehistoric chimpanzee settlement. The stones they excavated show the h...hing nuts when compared to ancient human or modern chimpanzee stone tools. Also, they found several types of starch grains on the stones; part of the residue deri...

Gene study shows three distinct groups of chimpanzees

...atologists could use to determine the origins of a chimpanzee with uncertain heritage. "Finding such a marked...ive percent of their DNA from more than one common chimpanzee population were rare, with most of the hybrid chimps born in captivity. "We saw little evidence o...

E. coli bacteria migrating between humans, chimps in Ugandan park

...acteria ?specifically Escherichia coli ?with local chimpanzee populations. And some of the E. coli strains migrating to chimps are resistant to antibiotics used by humans in Uganda. Their study will appear in the April 2007 issue of Biological Conservation and is available now on the journal’s Web site. O...

Ape gestures offer clues to the evolution of human communication

...pon the social context in which it is used. "A chimpanzee may stretch out an open hand to another as a signal for support, whereas the same gesture toward a possessor of food signals a desire to share," said Pollick. "A scream, however, is a typical response for victims of intimidation, threat or attack. Th...

Neuron cell stickiness may hold key to evolution of the human brain

...re more than 98 percent of their genome with their chimpanzee cousins, but the final products of those genomes a... the researchers performed similar analyses on the chimpanzee and mouse genomes. They examined 1,050 accelerated chimpanzee CNSs and 4,707 accelerated mouse CNSs....

Road-crossing in chimpanzees: A risky business

...mes necessitated by intersection with longstanding chimpanzee travel routes, presents a new situation that calls for flexibility of responses by chimpanzees to variations in perceived risk. Understanding how chimpanzees cross roads as a group would help shape our hypotheses about the emergence of hominoid socia...

Ebola-outbreak kills 5000 gorillas

...he devastating impact of Ebola on wild gorilla and chimpanzee populations. Since reports of ape die-offs first c...ossi was just one in a series of large gorilla and chimpanzee die-offs caused by Ebola over the last twelve years. Accurate figures on exactly how many apes have ...

Wild gorillas carriers of a SIV virus close to the AIDS virus

...RD and the University of Montpellier 1, showed the chimpanzee subspecies living in the Congo Basin (2) to be the...the consequence of inter-species transmission from chimpanzee to humans, whereas the origin of HIV-1 group O is less apparent. It cannot be excluded that chimpanz...

Genetic study of Neanderthal DNA reveals early split between humans and Neanderthals

...nderthal sequence by comparing it to the human and chimpanzee genomes. This revealed multiple locations where th...anderthal sequence matched more closely to that of chimpanzee and not human. Using the comparison of the Neanderthal to the human and chimp genomes enabled the in...

Comparing chimp, human DNA

Most of the big differences between human and chimpanzee DNA lie in regions that do not code for genes, according to a new study. Instead, they may contain DNA sequences that control how gene-coding regions are activated and read. "The differences between chimps and humans are not in our proteins, but in ...

Researchers discover key mechanism by which lethal viruses Ebola and Marburg cause disease

... in part for the recent decline in the gorilla and chimpanzee population in central Africa. There is no cure or approved vaccine for either Marburg or Ebola virus. Immunosuppression occurs early after infection and allows the viruses to reproduce rapidly and cause disease. "Currently, there is no way to tre...

Male chimpanzees prefer mating with old females

Researchers studying chimpanzee mating preferences have found that although male c...tes. The findings uncover a stark contrast between chimpanzee behavior and that of humans, their primate cousins. The basis for this difference may lie in the fac...

Complexity constrains evolution of human brain genes

... humans appear to have evolved more slowly than in chimpanzee or old-world monkey." Humans have an exceptiona...ed." Although the gene sequences from human and chimpanzee remain very similar, previous studies in tissues other than the brain have shown that gene expressio...

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