Wetlands: the what, why and where

WETLANDS: THE WHAT, WHY & WHERE

8/1/2020

Technical information for this article supplied by our friend and colleague, Bernie Kerkvliet of Skyland Ponds in Lake Arrowhead, California.

What is a Wetland?

Ecologically speaking, it is known as an Ecotone. An Ecotone is a transition zone between two diverse communities. It contains organisms native to each overlapping community, as well as organisms characteristic to the Ecotone itself.
In a wetland, life is very dense and variable. Every ounce of water from a wetland environment contains millions of organisms that make up a highly diverse community.
The Plantonic community includes algae or phytoplankton, zooplankton, and bacteria. Together, they are the plants, animals, and scavengers of this unique, aquatic ecosystem. The scavenger-like plantonic bacteria, along with fungi, clean up the corpses, wastes, and organic debris present in the water. The algae transforms sunshine and inorganic nutrients present in the water into food so it can grow and reproduce. In a nutshell, the bacteria, fungi, and phytoplankton all feed on impurities in the water and clean it as it flows thru the wetland. These are the base consumers of the ecosystem, or the base of the food chain. The amazing thing is the phytoplankton and bacteria can produce another generation in a matter of hours to days. Pretty cool, huh?
Simply put, the phytoplankton represents the grass and herbaceous plants in a meadow. The zooplankton which are protozoans, rotifers, and tiny crustaceans are the animals that feed on the plants in the meadow (Phytoplankton).
This basis for the food chain in turn provides food for insects, fish fry, larvae, etc. Aquatic plants also get their nutrients from the water and decomposing sediment in the wetland. The food chain continues to grow to include larger fish, frogs, reptiles, and eventually mammals and birds.

Tempe Town Lake, 5/18/2008

What do Wetlands Do?

Wetlands are also good for slowing the water down. In a constructed wetland, we accomplish this by the size of pump supplying the wetland. Slowing the water down allows for sediment to settle out. In nature, after hundreds, or even thousands, of years, sedimentation continues until a meadow is formed. The sedimentation process prevents soil from washing downstream. Since the water is almost stationary, it allows water to percolate down into the water table.

A lovely diverse meadow supporting a plethora of life.

In a constructed wetland, the nutrient rich sediments are periodically pumped out on to the surrounding landscape.
The sedimentation process in both cases produces water clarity.
Wetlands, whether natural or man-made, are the most effective water purification systems on earth.

Where do Wetlands Come From?

Wetlands can be created in many ways. They can be built by rivers in slow moving waters and deltas that create wetlands. Lakes and landlocked basins can develop into wetlands, as well.
Aquascape has developed a very effective arificial wetland system that is very effective. Whenever water filtration is required, we prefer to use a constructed wetland if possible. This does require a bit of extra room on the property, but the results are well worth it – and it’s pretty!
One of the best ways nature has for building wetlands, man has destroyed in multiple ways. The best natural builder of wetlands is the beaver. All the industrious work the beaver has done in the northern hemisphere, man has slowly destroyed all in the name of two things: a hat and “progress. “ We hesitate to go too far into the history of the fur trade and beaver felt hats that became so popular in Europe, but the fact is that’s what started it all. But let’s fast forward to a little more current time in North America.
The total land area in the contiguous United States is 2.96 million square miles. It is estimated that there were some 200 million beavers in the US at the time white man came from Europe. It is also estimated that there were about 300,000 square miles of beaver ponds at that time. Can you imagine the benefits that brought to the land? Better plant and animal biodiversity, slow moving water meant better water percolation and recharge in the water table, flood control, clear unpolluted water -- and those are just some of the macro benefits.

What Can I Do AS JUST A HOMEOWNER?

In the pursuit of fur, hats, farmland, industry, and “progress,” our land is not what it used to be. That is why the work that we do is so important. Each pond, pondless, patio pond, fountainscape, stream, and waterfall we build creates another little island of biodiversity in our individual private back yards.
The bonus is that it also creates ambiance to help us decompress, to bring us back to nature after being “plugged in” all day, to teach our children about the nature world, and to use this natural world to teach a multitude of other subjects from biology to math to art to music, and beyond. And then there’s just the pure enjoyment of a backyard oasis – something that takes minutes per week to maintain, but provides hours upon hours of simple pleasure.