Least Concern Extinct. Current Population Trend: Decreasing. This photo was submitted to Your Shot, our photo community on Instagram. Follow us on Instagram at natgeoyourshot or visit us at natgeo. Share Tweet Email. Go Further. Animals Climate change is shrinking many Amazonian birds. Animals Wild Cities This wild African cat has adapted to life in a big city. Animals This frog mysteriously re-evolved a full set of teeth. Animals Wild Cities Wild parakeets have taken a liking to London. Animals Wild Cities Morocco has 3 million stray dogs.
Meet the people trying to help. Environment COP26 nears conclusion with mixed signals and frustration. Environment Planet Possible India bets its energy future on solar—in ways both small and big.
Environment As the EU targets emissions cuts, this country has a coal problem. Paid Content How Hong Kong protects its sea sanctuaries. History Magazine These 3,year-old giants watched over the cemeteries of Sardinia. Science Coronavirus Coverage What families can do now that kids are getting the vaccine. Magazine How one image captures 21 hours of a volcanic eruption. Are you hot? Or are you sick? A new study in Royal Society Open Science opts for choice 3.
There are a couple of ways to change skin color. The first involves melanin, a natural colored pigment made by the body. This pigment sits in microscopic pouches in the skin, called granules, and helps protect against damaging UV rays. Mild sun exposure causes the skin to produce more of these melanin granules as a defensive shield. The result is a tan.
Blood flow is a second route for darkening skin. When extra blood cells course into the skin, it turns red. Such is the case when people get sunburns.
The same happens when you blush after being embarrassed , though the trigger in that case is a hormone — adrenaline — rather than sun rays. The intensity of the redness depends on how much oxygen is carried by the blood. To explore which option accounts for red faces in Amazonian primates, an international group of veterinarians and scientists collected skin specimens from deceased monkeys in the jungles of Peru.
The golden-backed uacari on the upper Rio Negro, Brazil. Oryx 25 2 Barnett AA. The meanings of Cacajao and Uacari: folk etymology in neotropical primate taxonomy. Neotrop Prim 12 3 Bartecki U, Heyman EW. Abundance, diversity, and patterns of distribution of primates on the Tapiche River in Amazonian Peru. Am J Primatol 54 2 Boubli JP.
The black uakari monkey in the Pico da Neblina National Park. Neotrop Prim 2 3 PhD dissertation, University of California, Berkeley. Feeding ecology of black-headed uacaris Cacajao melanocephalus melanocephalus in Pico da Neblina National Park, Brazil. Intl J Primatol 20 5 Southern expansion of the geographical distribution of Cacajao melanocephalus melanocephalus. Intl J Primatol 14 6 Neotrop Prim 5 4 Western extension of the range of bearded sakis: a possible new taxon of Chiropotes sympatric with Cacajao in the Pico da Neblina National Park, Brazil.
Neotrop Prim 10 1 A taxonomic reassessment of Cacajao melaocephalus Humboldt , with the description of two new species. Intl J Primatol Bowler M. The ecology and conservation of the red uakari monkey Cacajao calvus ucayalii in the Yavari valley of Peru [abstract]. Prim Eye Project uakari: first report-preliminary survey. Part one-zoology. Rio de Janeiro: Pronatura. Malaria infection rate of Amazonian primates increases with body weight and group size.
Funct Ecol 5 5 Defler TR. Cacajao melanocephalus ouakary densities on the lower Apaporis River, Colombian Amazon. Prim Rep Fission-fusion in the black-headed uacari Cacajao melanocephalus in eastern Colombia. Trianea Fernandes MEB. Tail-wagging as a tension relief mechanism in Pithecines. Folia Primatol The red ouakari in a seminatural environment: potentials for propagation and study.
Primate conservation. New York: Academic Pr. Fontaine R. The uakaris, genus Cacajao. Ecology and behavior of neotropical primates. Groves C. Order primates. Mammal species of the world: a taxonomic and geographic reference, third edition, volume 1. Nested societies. Convergent adaptations of baboons and snub-nosed monkeys?
Hershkovitz P. Uacaries, new world monkeys of the genus Cacajao Cebidae, Platyrrhini : a preliminary taxonomic review with the description of a new subspecies. Am J Primatol 12 1 Heymann EW. Further field notes on red uacaris, Cacajao calvus ucayalii , from the Quebrada Blanco, Amazonian Peru. The red uakari Cacajao calvus ucayalii : some field observations and speculations on a little-known species [abstract]. Preliminary survey of Cacajao melanocephalus melanocephalus in southern Venezuela.
Intl J Primatol 15 6 Leonard S, Bennett C. Associative behavior of Cacajao calvus ucayalii with other primate species in Amazonia Peru. Primates 37 2 Behavioral ecology study of red uakari, Cacajao calvus ucayalii , in northeastern Peru. Neotrop Prim 3 3 Primate conservation in Brazilian Amazonia. Norconk MA. Sakis, uakaris, and titi monkeys: behavioral diversity in a radiation of primate seed predators. Primates in perspective. New York: Oxford U Pr. Peres CA.
Primate community structure at twenty western Amazonian flooded and unflooded forests. J Trop Ecol 13 3 Silva JS Jr.
On a new white bald uakari population in southwestern Brazilian Amazonia. Neotrop Prim 7 4 Walker SE. The evolution of positional behavior in the saki-uakaris Pithecia , Chiropotes , and Cacajao. Adaptive radiations of neotropical primates. New York: Plenum Pr. Positional behavior of the white uakari Cacajao calvus calvus. Am J Phys Anth 2 Ward NS, Chism J.
0コメント