Wetlands
What Are Wetlands?
It’s all in the name: “wetlands”—areas that are wet all or part of the time, have soils derived from wet, low-oxygen conditions, and host vegetation that thrives in these water and soil conditions.
However, it’s not always straightforward. While wetlands are usually wet, they might not be year-round. Constantly wet swamps are wetlands, but so are prairies, which are wet most of the time but appear dry during the summer. Sometimes, the water lies just below the surface, hidden from view.
Wetlands differ due to variations in vegetation, soils, landscape, and climate. They can have surface water, plants, trees, shrubs, open meadows, shorelines, or a combination.
As transitions between open water and solid land, wetlands perform vital environmental and economic functions. They are the most biologically diverse and productive of all ecosystems. Acting as “nurseries” for aquatic life, they provide habitats for hundreds of plants and animals. Wetlands also recharge groundwater used for drinking water and agriculture.
Acting as sponges, they absorb flood water from major rain events and reduce lake wave action. As “nature’s kidneys,” they filter water and runoff from parking lots, home lawns, and farmland.
The abundant wetlands of our lake region face severe threats. Seawalls, by eliminating natural shorelines, are intensifying wave action, leading to significant erosion; some wetland shorelines have receded as much as 70 feet over the past few decades. Furthermore, commercial development is diminishing the crucial inland wetlands that help absorb and filter our water.
Wetlands age, much like humans do. When they age, sediment builds up, and non-native plants can overwhelm them. As a result, they cannot support as much wildlife diversity and lose their filtering capacity. Scientists have known for decades that aging wetlands hold fewer contaminants and can even release excess nutrients into lakes. These sediments and nutrients can often result in toxic algae blooms or sediment plumes.
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Top in Indiana: Kosciusko and Noble Counties boast over 6% of the state's wetlands.
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Indiana has lost 85% of its wetlands since the 1780s.
Wetland Types
Scientists have developed over 50 different descriptions across nine general categories.
However, only four general categories exist in our region:
Marshes
are mostly underwater and dominated by soft-stemmed plants. Lakes like Webster and The Backwaters offer good examples of freshwater marshes.
Swamps
are home to woody plants like trees and shrubs that thrive in wet conditions. They can be found in the Tri-County Fish & Wildlife Area. Most lakes in Kosciusko County have combinations of marshes and swamps.
Bogs
are characterized by spongy peat deposits and are covered by a thick carpet of sphagnum moss.
Fens
are peat areas covered by grasses, reeds, and flowers. Both fens and bogs are sources of prized gardening peat moss. While both fens and bogs exist in our region, they are typically found around the Great Lakes and in other northern climates.
Where are the wetlands in our watershed?
The Wawasee Watershed has many recognizable wetlands. Two marsh wetlands readily seen from Lake Wawasee are Conklin Bay and Johnson Bay. The Zimmerman Preserve is located at the Eastern edge of the Johnson Bay Wetland.
Another marsh wetland, Mudd Lake, sits between Syracuse Lake and Lake Wawasee, visible from our Between the Lakes Preserve. Syracuse Lake Wetlands is located on the east side of Syracuse Lake.
Turkey Creek Wetlands are along the Turkey Creek Tributary, which flows into the east end of Lake Wawasee. These wetlands are located on or directly adjacent to the lake. However, as we continue deeper into the Lake Wawasee Watershed we see over a thousand acres of wetlands and protected properties held in conservancy by WACF ensuring their future.
Drone footage of Turkey Creek Wetlands.
Native plants found in our watershed wetland zones
Broadleaf Cattail
Typha Latifolia
The broadleaf cattail is native to Indiana. Found predominantly in freshwater wetlands where the area is undergoing transition from wet to drier conditions. Cattails provide nesting sites for fish, red-winged blackbirds, ducks, geese, muskrats, finches, and beavers.
Waterlilly
Nymphaea Odorata
Typically found in the tranquil waters of ponds, lakes, and slow-moving sections of rivers and streams. Native to Indiana, this species is ecologically significant, offering habitat for a variety of aquatic creatures such as insects, frogs, turtles, and fish.
Swamp Milkweed
Asclepius incarnata
In the diverse wetlands of swamps, hydric soils, wet pine flatwoods, and marshes, this plant flourishes. Its summer blooms are a vibrant draw for butterflies and a wide array of other pollinating insects, highlighting its significance as a nectar source.
Winterberry Holly
Ilex Verticillata
A native deciduous holly shrub found throughout Indiana, with a particular abundance in wetlands and boggy areas. Winterberry plays a multifaceted ecological role, primarily as a critical winter food source for birds and small mammals, but also by attracting pollinators and serving as a host plant for particular butterflies.
Buttonbush
Cephalanthus Occidentalis
Buttonbush is a distinctive native shrub with spherical pincushion blossoms. In bloom, the flowers of the buttonbush tree offer a feast of nectar, attracting butterflies, moths, bees, and hummingbirds. In the fall, these flowers give way to a ball of nutlets, which become an important food source for ducks and songbirds
Spotted Joe-Pye Weed
Eutrochium Maculatum
Valued for its beauty and ecological benefits, this native perennial features fragrant, pinkish-purple flowers that attract butterflies and bees, while also serving as a host plant for the larvae of certain moths and butterflies.
Cardinal Flower
Lobelia Cardinalis
With striking red, tubular flowers and abundant nectar, Cardinal flowers are native perennials that play a crucial role in attracting pollinators. Hummingbirds are particularly drawn to them and serve as their primary pollinators, while butterflies also frequent these plants.
Swamp Rose Mall
Hibiscus Moscheutos
The Indiana Plant Atlas classifies it as native and an obligate wetland plant (OBL). The plant is a valuable food source and habitat for various wildlife, including butterflies, moths, bees, hummingbirds, and songbirds.
Bur-reed
Sparganium eurycarpum
Giant Bur-reed thrives in sunny, wet areas like marshes and stream edges. This plant is crucial for wetlands: its seeds feed waterfowl, muskrats consume the entire plant, and it offers habitat for diverse wetland creatures. It improves water quality by absorbing excess nutrients and prevents erosion with its strong root system.
Sedge
Carex
Sedge habitats are vital for diverse wildlife, offering shelter to rare species like Massasauga rattlesnakes, various dragonflies, ribbon snakes, and grassland birds (Bobolink, Northern Harrier, Sedge Wren). They’re also a key food source, providing seeds for songbirds, waterfowl, and small mammals, and acting as larval food for many butterflies.
Bulrush
Schoenoplectus tabernaemontani
Provides essential food, shelter, and nesting habitats, bulrushes are key players in Indiana’s ecosystems, supporting a wide array of wildlife including birds, turtles, muskrats, snakes, and amphibians. Beyond this, they’re crucial for erosion control along stream banks, stormwater ponds, and wetlands.
What happens if a Wetland becomes saturated and stops filtering?
We know that once cattails and other wetland plants die, they return phosphorus and nitrogen to the sediment. So when it rains, or there’s a greater flow through the wetland, these extra nutrients are not absorbed but may be carried into the lake. In this case, the wetland may act like a sink over time – holding the phosphorus and nitrogen but draining it when the waters are high or the flow is fast. WACF has questioned how well the wetlands are filtering water before it enters our lakes and continues to research that question.
One of WACF’s many projects is working on a pilot project to restore .1 acre of wetland area near the Conklin Bay Trail. We are partnering with the DNR, Department of Fish and Wildlife, and Syracuse-Wawasee Trails to see if a diverse wetland can be established, how long it will take, and how long it will last.
Graphics Credit:
Wetlands
https://www.vanburencountymi.gov/581/Wetlands
Photo Credits:
https://www.usgs.gov/news/cattail-typha-invasion-north-american-wetlands
https://www.fws.gov/sites/default/files/documents/Ecological-Risk-Screening-Summary-Fragrant-Waterlily.pdf
https://plants.usda.gov/plant-profile/ASIN/images
https://finder.indiananativeplants.org/native_plants/spotted-joe-pye-weed/
https://giving.upenn.edu/pure-nature/
