As I mentioned in last week’s post, my day job is working for a local college as a biology and chemistry tutor. I got my own degree in biology a few years ago, and have since been working various positions in management and academia. My specialty is wildlife biology, but I have experience with everything from veterinary medicine to botany. I don’t run into many scientist writers, much less biologists, so I thought I would share my expertise insofar as it pertains to constructing fantasy worlds.
As with societies, ecosystems are first shaped by geology. The shape of the world is extremely important for determining weather patterns, which in turn dictate where the water will fall, and thereby where life will spring forth. Mountain ranges will generally be wet on one side and dry on another, creating a divide between forest and desert. On a smaller scale, north facing slopes tend to catch more moisture than their south facing backsides. This effect causes there to be spots of relative moistness and dryness even within the larger forest or desert. The geologic age of a mountain range can determine if its peaks are jagged spires of exposed rock, or rolling hills beneath a lush canopy. It’s also important to remember that rivers run downhill, but they also shape the land through which they run. Rivers may cut deep gorges through the mountains, or fan out across a valley. Latitude and elevation also play important roles in shaping an ecosystem. All these abiotic (nonliving) elements conspire together to form the basis for a specific and unique web of life.
When land is first created by volcanic eruptions it is barren and lifeless. Then lichens begin to grow on the rocks, slowly breaking them down through chemical and mechanical processes. Along with the decomposition of the dead lichens, this forms a sort of proto-soil on which mosses can happily grow. Mosses will accelerate the soil building process, which will be aided by erosion of the rock due to the weather. Once a thin soil develops, grasses can colonize the new land. As the soil becomes richer with decomposing plant matter and broken rock, new species will outcompete the old. Eventually, shrubs and small trees will grow, followed by taller and leafier trees that will shade out the smaller species. After a long succession of species, the land will finally reach a climax forest and the process will halt. The trees that dominate the forest outcompete everything else, but they never could have colonized the barren stone. When a tree falls, or when a wildfire comes through, it creates an opening for the wildflowers, grasses, and bushes once more. It’s important to keep succession in mind when designing an environment because you wouldn’t want to put a sun-loving maple beneath the boughs of a shady oak. Employing the concept of succession in your writing can also provide some much needed character to natural settings. A forest is never just a forest; it is a patchwork of disturbance and succession. A forest is not a blanket of the same three trees; it should be a quilt that contains old growth stands, meadows, bushes, and young trees, each competing with the other.
Once you have your geology and plant community prepared, you can start thinking about wildlife. Like plants, animal species occupy different niches. Elk like to graze in meadows, deer prefer the forest’s edge, while moose like wading through marshy land. It’s also important to note that animals seldom sleep where they eat. Elk may graze in the meadow in the morning and evening, but will take shelter in a shady and thick forest at noon and night. Their shady retreat protects them from overexertion in the heat of the day and serves as a timber fortress to defend them from predators. Many animals will also move with the turning of the seasons. Migrations can be to lower elevations for winter, or even lower latitudes. In the spring, most animals have their young and need a safe and food-dense place to rear them.
Predators will always follow their prey; they will be active when their prey is active and sleep when their prey sleeps. Predators also have their niche. Wolves are coursing predators, meaning they chase their prey down, while mountain lions prefer to wait in ambush. Since wolves hunt in a pack, they can kill animals as big as a bison, whereas mountain lions are solitary and prey primarily on deer. Wolves prefer the wetter lowlands, while mountain lions stick to the rocky highlands. Wolves will try to steal a mountain lion’s cached kill if they can, and will chase the lion away. There are a host of scavengers that will visit a corpse once the apex predators are done with it. Coyotes, foxes, ravens, eagles, vultures, magpies, wolverines, and even bears will make a meal from the remnants of a slain deer. The specific species will vary in an ecosystem according to a variety of factors, but the tale of hunter and hunted is always the same.
I’d be remiss if I glossed over the small creatures, as so many of us are wont to do. There will be insects buzzing through the air and crawling across the ground. Spiders will spin their silk homes between the tall blades of grass. Fish will course through the streams, gobbling up anything they can fit in their mouthes. Squirrels will build their homes in trees and underground. Mice will forage in the meadows, and marmots in the mountains. Salamanders will sit patiently in the water or under moist logs, waiting for something tasty to crawl by. Frogs will croak their songs that can carry for miles. The drilling of a busy woodpecker will echo through the forest, and the piercing cry of the hawk will make everyone take pause. Lizards and snakes will bask in the sun, and owls will glide through the night. Every ecosystem is bursting with life from top to bottom, even deserts.
We all have occasion to describe the natural world, and those descriptions can be more real and more beautiful if we consider the ecosystem from top to bottom. A character can never just stroll through the forest. That forest is filled with plants and animals of every kind, and they will fill it with their sights, sounds, and smells. Agricultural land is filled with birds and rodents of every kind, as well as foxes, coyotes, and badgers. Even our cities are not exempt. Birds, rodents, cats, and dogs will make their homes on the streets and falcons will nest upon the castle tower. Even in our modern, sanitized lives, nature is present. For our characters, the natural world is omnipresent.