The jungles of Guatemala are teeming with life.
The guttural calls of howler monkeys haunt the rainforest from above, where scarlet macaws hop branches in flashes of red, yellow and blue.
On the forest floor opossums, peccaries, and oversize rodents called pacas move through dense brush, occasionally picked out by the few shafts of light able to break through the canopy. Ocellated turkeys plumed in iridescent copper and emerald advertise themselves to potential mates with thumping sounds, while spider monkeys perch on the weathered stones of long-forgotten Mayan cities that were swallowed by the jungle centuries ago.
As in most tropics, the apex predators are cats — four different species, to be exact. Jaguars sit at the top, unchallenged. Pumas, close in size if not ferocity, also find sustenance in the rainforest alongside ocelots and margays.
How do four medium to large carnivores exist side by side?
By dividing time, space and items on the menu, according to a new study.
The felids hunt at different levels of the jungle at different times of day, and while there’s overlap between prey, each species has its own distinct diet, according to a research team from Oregon State University. Their paper, Niche partitioning among neotropical felids, was published earlier this month in the Journal of Animal Ecology.
As the big kids on the block, jaguars primarily eat peccaries (pig-like ungulates that weigh up to 88 pounds), armadillos, deer and, sadly, ocelots. Apparently membership in Club Felid does not grant the smaller wildcats a pass. Ocelots top out at about 35 pounds, while the largest jaguars weigh in at about 350 pounds, making the smaller cats easy prey.
Pumas opportunistically prey on peccaries and brocket deer, but the majority of their diet is composed of monkeys, both spider and howler. Ocelots and margays naturally go for smaller prey, sticking mostly to rodents and opossums.
While jaguars hunt on the ground and have a well-documented habit of slipping into the water to prey on caiman and crocodiles, pumas, ocelots and margays take advantage of their climbing abilities and lighter frames to reach arboreal prey. That allows pumas, for example, to snag monkeys and arboreal opossum species from the canopy, so they don’t have to compete with jaguars.
The team verified the “spatial, temporal, and dietary niche partitioning” within the Maya Biosphere Reserve by using ground camera traps, arboreal camera traps and fecal samples, which allowed them to confirm the prey each species has been consuming.
Interestingly, margays are the pickiest — or perhaps most limited — of the bunch, preying on only seven species, while the other three cats regularly hunt between 20 and 27 different kinds of animals.
The information gleaned from the study not only helps researchers understand how these species interact with their environment, but also can help guide conservation decisions to safeguard them against extinction.
via Pain In The Bud