Predatory-Prey Relationships - Laotian Rainforest
Rain forest relationships are better described as a web—a rainforest food web. and jaguars—the big snakes, the big crocodilians and the largest birds of prey. Due to the scarcity of large prey, larger predators are relatively rare in the rainforest. Many of these carnivores have adapted to cope with the. Predator-Prey Relationships - The College of Science and Mathematics. Rainforest Resources» Rainforest Journals» Predator-Prey.
When the willows are no longer being eaten, they go back to producing new shoots that have no toxins, and then the hares can increase and so can the lynxes. This all takes about 10 years to repeat itself.
Predator-Prey Relationships - College of Science and Mathematics
So, maybe it's the plants controlling the herbivores from the "bottom" of the food pyramid, rather than the predators controlling from the "top. Now biologists are more cautious about conclusions and try to look broadly at many interacting components in ecosystems before drawing conclusions.
On BCI, for example, there were scientists who felt that the ecosystem is not "normal" because they did not see many signs of predators. Now we know that the predators are there, but are just hard to detect.
Our remote-sensing camera system has helped in this regard. Also, scientists have thought that the snowshoe hare and lynx story of changing numbers is typical of species in the cold, wintry north, but not in the tropics where the climate is relatively stable. However, the results of the mammal census have shown us that the numbers of only some species stay the same, while many others do show sharp changes.
This has coincided with a time when the number of ocelots on the island has remained high at 26 individuals. So did the ocelots eat lots of these agoutis?
How many agoutis do ocelots actually eat? We just don't know. Even with all 30 of our cameras working, we rarely get photos showing ocelots with prey.
In hundreds of ocelot still photos we have just two cases of predation-- one ocelot catching an opossum, and one carrying a spiny rat. The opossum photo is interesting because it's part of a story.
We have a photo first of a small "common Opossum" of the type called "Didelphis. This prevents the camera from using up an entire roll of film on one animal that stands in front of the camera. The next photo shows the male ocelot "Colmillo" which means"Tooth" grasping something dark and furry in his toothy jaws and using his paw to hold it, in the exact same location as where the opossum stood. Then Colmillo is gone and hours later that night a big opossum stands in the same spot, with his fur sticking up and his eyes wide open in alarm.
I went to the location after I developed the film, and found tufts of opossum fur at the exact spot where the small opossum stood. I imagine that the big opossum was very frightened by the evidence of violence on that spot and the bright flash from the camera. People on BCI rarely see ocelots, and hardly ever observe predators in action. Yet, two remarkable observations occurred in the last few months. The cat climbed into a low tree, following the monkey upwards.
The cat caught the monkey by the throat, and they tumbled to the ground, where the ocelot killed the monkey with a neck bite, and dragged it away into the forest. The other howler monkeys kept screaming for a long time. These are very special sightings. We also know from the agouti radio-tracking work of Enzo Aliaga-Rosell that agoutis are often eaten by predators.
Our video camera-trap allowed us to capture one more case of predation by ocelots, this time on an agouti. You can view our video clip that shows a mother ocelot bringing her large kitten at night to share an agouti that she killed earlier in the day.
The tape was recorded in infrared light, so the cats would not be disturbed. We found declines of sloths and frequent encounters of dead sloths on BCI in the past few years. However, t's so difficult to count sloths accurately, and they never appear in our camera-trap photos, so it's hard to say what's happening. In this video, a baby mountain gorilla in Rwanda fails hilariously when he tries to prove himself to a group of tourists.
RAIN FOREST FOOD WEB: TOP PREDATORS
There are fewer than 1, mountain gorillas left in the wild. Nto only are naked mole rats naked, but even though they are mammals, their family structure more closely resembles that of bees, ants, wasps, and other social insects. All the mole rats living in each underground mole rat colony serve the needs of their giant mole rat queen—who, like a queen bee or a queen ant does all the reproducing and is therefore the mother of all her subjects.
Naked mole rats are native to the grasslands of East Africa. Bugs That Give Directions We all know that insects can't talk. However, some species can communicate nonetheless. Ants for instance lay down a trail of chemical markers called pheromones to tell other members of their colony where to find a food source.
Because bees fly to and from their food, a chemical trail is not an option for them. Instead, honeybees are able to give their hive mates precise directions to a distant patch of flowers using an amazing form of dance. In this video, scientists tell us exactly how the bees accomplishing this incredible feat of nonverbal communication.
Shape-Shifting Octopus Ooctopi are widely know to be the most intelligent of all invertebrates. They can learn such relatively complex tasks as undoing latches and opening jars—and they are infamous for their ability to escape from tanks and other enclosures. But the recently discovered mimic octopus of the South Pacific adds a strange, new twist to octopus intelligence with its ability to disguise itself as any number of other sea creatures in order to scare off would-be predators.
Born Twice A baby kangaroo first leaves its mother's body while it is still an embryo. It doesn't even have fully developed hind legs at this stage.
The hairless, jellybean-sized creature makes its way to its mother's pouch, where it develops into a real kangaroo—and the first time it jumps from the pouch is almost like a second birth. The fish knocks bugs off of overhanging vegetation by blasting them with a powerful stream of water from its mouth. Once the insect falls into the water it's helpless, and the archer fish can eat it at its leisure. These amazing fish can spit water up to two meters six feetand they almost always hit their mark.
One species of ant making slaves of another. The slave-makers are known as Polyergus ants, and they are native to North America. Periodically, Polyergus will raid the colonies of another species, where they use an array of deceptive chemical signals to overcome the other ants.
They then carry eggs of the conquered species back to their own colony, where they they raise them and put them to work.
One of the most interesting aspects of this slaving behavior is that, not only does the Polyegus queen participate in the raid, but she is key to its success. The queens of all other species of ants never leave the nest.
Deep sea anglerfish live so far down in the ocean that there is very little light in their environment. Creatures at that depth are drawn to any illumination, and the anglerfish takes advantage of that fact by using its natural headlamp to attract prey. But that's not the weirdest thing about the anglerfish: