Study finds bonobos may be better representation of the last common ancestor with humans than common chimpanzees

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A new study examining the muscular system of bonobos provides firsthand evidence that the rare great ape species may be more closely linked, anatomically, to human ancestors than common chimpanzees. Previous research suggested this theory at the molecular level, but this is the first study to compare in detail the anatomy of the three species.

Study finds bonobos may be better representation of the last common ancestor with humans than common chimpanzees
A new study examining the muscular system of bonobos provides firsthand evidence 
that the rare great ape species may be more closely linked to human ancestors
 than common chimpanzees [Credit: iStock]

“Bonobo muscles have changed least, which means they are the closest we can get to having a ‘living’ ancestor,” said Bernard Wood, professor of human origins at the GW Center for the Advanced Study of Human Paleobiology.

Scientists believe that modern human and common chimpanzee/bonobo lineages split about 8 million years ago with the two great ape species splitting about 2 million years ago. As common chimpanzees and bonobos evolved after their split, they developed different traits and physical characteristics, even though they remained geographically relatively close, with their main division being the Congo River. Because of this, researchers have been curious as to what those differences are and how they compare to humans. By studying the muscles of bonobos (which indicates how they physically function), the team was able to discover that they are more closely related to human anatomy than common chimpanzees, in the sense that their muscles have changed less than they have in common chimpanzees.

Study finds bonobos may be better representation of the last common ancestor with humans than common chimpanzees
These are differences between head muscles of common chimpanzees, bonobos and modern humans. There are no major 
consistent differences concerning the presence/absence of muscles in adult common chimpanzees (left) and bonobos 
(center), the only minor difference (shown in grey in the common chimpanzee scheme) being that the omohyoideus 
has no intermediate tendon in bonobos, contrary to common chimpanzees (and modern humans). In contrast, there 
are many differences between bonobos and modern humans (right) concerning the presence/absence of muscles 
in the normal phenotype (shown in colors and/or with labels in the human scheme) 
[Credit: Julia Molnar]

Earlier studies examined the DNA similarities and differences between bonobos and common chimpanzees, but this was the first study to compare the muscles of the three species.

“In addition, our study has shown that there is a mosaic evolution of the three species, in the sense that some features are shared by humans and bonobos, others by humans and common chimpanzees, and still others by the two ape species,” said Rui Diogo, lead author of the paper and associate professor of anatomy at Howard University. “Such a mosaic anatomical evolution may well be related to the somewhat similar molecular mosaic evolution between the three species revealed by previous genetic studies: each of the chimpanzees species share about 3 percent of genetic traits with humans that are not present in the other chimpanzee species.”

The researchers led a team that examined seven bonobos from the Antwerp Zoo that had died and were being preserved. Researchers said this was an extremely rare opportunity given bonobos’ status as an endangered species.

The scientists note that having a clear understanding of what makes humans different from our closest living relatives might lead to new breakthroughs or understandings of human health.

The paper is published in Scientific Reports.

Source: George Washington University [April 28, 2017]

1 COMMENT

  1. Yes, bonobos are probably better representations of the Homo-Pan LCA (last common ancestor) than common chimps. A lot of students have argued this already many years ago, including myself: "ontogenetic and morphological evidence tends to favour the hypothesis that the last common ancestor of Homo and Pan 8-4 Myr BP was a partially bipedal, gracile australopith with chiefly a mosaic of human and chimpanzee (esp. bonobo) features" (M.Verhaegen 1994 "Australopithecines: ancestors of the African apes?" Hum.Evol.9:121-139). Comparative evidence suggests that the LCA was a bonobo-like wetland dweller with humanlike feet (prenatal chimps have humanlike feet with near birth become handlike), who did not knuckle-walk, but climbed arms overhead & often waded bipedally, as bonobos still do sometimes, google "bonobo wading", in search for waterlilies & other wetland foods, google "unproven assumptions so-called aquatic ape hypothesis".

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