Unlike the four seasons that most of us are familiar with (spring, summer, fall, and winter), tropical rainforests have just two seasons: wet and dry. The rainforest's typical human population is between 77 and 88 percent. So like any other place, there are more males than females. But unlike other places, there aren't very many adults because people die young in tropical forests. The average age is about 28. Reasons for death include accidents, violence, disease, and natural causes (like heart attacks).
People used to think that since there were no true winters in tropical regions, there was no seasonality there. But scientists now know that tropical rainforests do experience a seasonal change, it's just that it happens slowly over several months rather than over a few weeks as we know it from temperate forests. During these changes, some parts of the forest are flooded or burned while others start growing new leaves and flowers. This is called "floristic variation."
Since light levels are low in the deep shade of large trees, only plants that use photosynthesis to make food contain nutrients. Most plants produce small seeds that don't need much protection from predators so they're scattered by wind or water. Some larger seeds have hard shells or bristles that protect them from animals who would eat them otherwise.
Throughout the year, the tropical rainforest has a humid season. Because of the tropics, there are no regular seasons such as summer, winter, autumn, and spring in the Amazon forest. Instead, temperatures in the jungle range from 26 to 30 degrees Celsius all year. It is not uncommon for it to reach 35 degrees Celsius during the day or fall down to 15 degrees at night.
There are two main seasons in the Amazon: the rainy season and the dry season. During the wet season, which is from April to October, it usually rains every day or almost every day. The average daily rainfall is between 10 and 20 inches (250-500 millimeters). During the dry season, which is from November to March, only one or two days out of seven are likely to see rain. This is because the sky is mostly clear during this time, so most of the sunlight that reaches the ground is reflected back up into space.
The difference between the rainy and dry seasons depends on how far away you are from the ocean. If you're near enough to the sea to be affected by ocean currents, then the seasons will change accordingly. But if you're in an isolated area without access to coastal waters, then your seasons will stay pretty constant regardless of where rain falls on earth.
The Amazonian landscape is characterized by large areas of flat land called terra firme.
Winter and the other four seasons do not exist in rainforests. We divide the year using seasons, yet not all regions on Earth experience seasons in the same manner... The Earth's climate is dominated by two factors: the angle of the Earth's axis with respect to the Sun and the distance between the Earth and the Sun. These two factors combine to determine what we call the Earth's seasonal cycle.
The Earth's axis is tilted with respect to its orbit around the Sun. This means that at any given time, some parts of the planet are in darkness while others are exposed to sunlight. Day and night events occur based on where you are on the globe during the tilt of the Earth on its axis. For example, if you were standing on the North Pole during winter, there would be no south-facing landmasses within hundreds of miles in any direction. Most countries with large populations have both summer and winter months when the sun is not visible for long periods of time.
At the South Pole it is dark all year round. The only time here on Earth when the sun is completely hidden from view is during a total solar eclipse when the moon comes between us and the Sun.
The fact that the Earth has an axis that spins every 24 hours means that we experience changes in light intensity throughout the year.
All year long, tropical rainforests are lush and warm! Temperatures seldom vary between night and day. The average temperature in tropical rainforests is between 70 and 85 degrees Fahrenheit (21 to 30 degC). Tropical rainforests have a somewhat humid climate, with humidity levels ranging from 77% to 88 percent all year. Rainfall is relatively constant throughout the year, averaging about 40 inches per year.
Tropical rainforests are important habitats for many species of animals and plants. They cover about 15% of the earth's surface but contain 50% of all known plant species. They are also home to an estimated quarter of all living organisms on Earth!
Trees in tropical rainforests are able to grow large enough to capture sunlight even when it is constantly raining outside their branches. This is because they use the sun's energy to produce food instead of water. Most trees in tropical rainforests are broad-canopied giants that provide homes for many different types of animals. There are small trees too, which tend to grow in closer proximity to one another. These make good eating if you're a monkey or a duiker!
The temperature in tropical rainforests is fairly consistent, so most animals that live there can adapt their behavior to suit the season. For example, monkeys will be more active during the day when it's hot outside their normal sleeping time, while at night they'll sleep more to avoid the heat.
Rainfall occurs all year in the tropical rainforest, owing to the fact that there are little or no seasonal fluctuations in the weather. Annual precipitation in tropical rainforests ranges from 60 to 160 inches (152 to 406 cm). Some jungles across the world receive around 400 inches of rain every year (over 1,000 cm).
Tropical rainforests are extremely sensitive to even slight changes in climate. When it gets hotter than usual or colder than usual, this can cause trees to grow faster or slower than normal, which could lead them to die. This is because trees depend on cold temperatures and sunlight to produce seeds and leaves, but not all parts of a tree need to grow at the same rate to keep them alive. Seeds need to be stored inside of the fruit until they are ready to sprout into small plants. Leaves should be produced when it's warm outside and not too hot or cold. Flowers usually come out in spring time, just before any seeds are expected to drop off of the trees pollination needs insects to transfer pollen from stamens to ovules on the petals.
Some species of trees will actually shed most of their leaves each season to protect themselves from heat and drought stress. The trees' roots become more active during winter time when there is less demand on them for growth, so they should not be burdened with wet feet. In summer time when it's hot and dry outside, the trees need to use their energy on growing rather than keeping themselves hydrated.