Bronte Wells
Georgia's salt marshes are some of the most biologically productive natural systems globally, producing nearly twenty tons of biomass per acre. They are home to a variety of wildlife and provide essential habitats for many species. However, these marshes face significant threats from pollution, development, and rising sea levels. In recent years, efforts have been made to protect and restore Georgia's salt marshes, with initiatives such as the Coastal Marshlands Protection Act safeguarding these vital ecosystems. Despite these measures, data suggests a concerning decline in the health of Georgia's salt marshes, with satellite imagery revealing a 35% decrease in marsh biomass over the last three decades.
| Characteristics | Values |
|---|---|
| Salt marsh acreage in Georgia | 368,000 acres (some sources state 429,294 acres or 500,000 acres) |
| Salt marsh width | 4-8 miles wide |
| Salt marsh health | A 35% decline in marsh biomass over the last 30 years |
| Salt marsh restoration efforts | The Army Corps of Engineers is working to restore tidal flow disrupted by the logging industry |
| Salt marsh protection laws | The Coastal Marshlands Protection Act of 1970, the Shore Assistance Act of 1979 |
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What You'll Learn
The impact of rising sea levels
Georgia's salt marshes are some of the most biologically productive natural systems globally, with the Georgia Department of Natural Resources reporting that they produce nearly twenty tons of biomass per acre. This makes them four times more productive than carefully cultivated cornfields. Salt marshes are also essential habitats for coastal wildlife, providing shelter, food, and nursery grounds for many commercial and recreational fish species. They are also vital for sequestering and storing carbon, filtering polluted stormwater runoff, and protecting coastlines from flooding, erosion, and storm surges.
However, Georgia's salt marshes are facing significant threats due to rising sea levels. As sea levels rise, salt marshes are at risk of being drowned or forced to migrate to higher ground. The conservation of adjacent lands and the removal of barriers, such as culverts and bulkheads, are crucial to enabling the natural migration of marshes. Georgia has taken steps to protect its salt marshes through legislation such as the Coastal Marshlands Protection Act, which safeguards against development threats.
The restoration of Georgia's salt marshes is underway, with projects funded by local and federal sources. The Army Corps of Engineers is working to correct decades of environmental damage caused by the logging industry, with initial efforts showing improvements in water flow and the return of natural features. Conservation initiatives, such as the Georgia Coastal Ecosystems Long-Term Ecological Research Project, are also studying the salt marsh ecosystem to better understand and protect these vital habitats.
In summary, Georgia's salt marshes are facing the impact of rising sea levels, which threatens their productivity and the ecosystems they support. Conservation efforts and restoration projects are crucial to ensuring the long-term health and resilience of these valuable natural landscapes.
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The role of the Coastal Marshlands Protection Act
Georgia's salt marshes are some of the most biologically productive natural systems on Earth. They are primary nursery areas for blue crabs, oysters, shrimp, and other economically important fish and shellfish. Young shrimp and other marine organisms also use salt marshes as shelters and hiding places from predators. In addition, salt marshes help filter pollutants from the water and act as buffers against offshore storms, reducing the potential damage from large storm-spawned waves and tides.
In 1970, Georgia legislators passed the Coastal Marshlands Protection Act (CMPA) to protect the state's coastal salt marshes from damage by a proposed phosphate mining operation and other industrial activities. The Act provides the state government with the authority to protect tidal wetlands and regulate certain activities and structures in marsh areas. The Coastal Marshlands Protection Committee (CMPC) was created to manage and issue permits for activities that occur within the jurisdiction of this state law, which includes marshlands, intertidal areas, mudflats, tidal water bottoms, and salt marshes.
The role of the CMPA is to ensure sustainable development in Georgia's coastal areas while protecting natural resources. The permitting program of the Coastal Resources Division (CRD) administers permits for projects that may impact marshlands, beaches, and tidally influenced coastal waters under the CMPA. The CRD uses three main mechanisms of authority to regulate activities and structures in jurisdictional marsh and shore areas: the CMPA, the Shore Protection Act, and Revocable License Authority. The CRD works with federal, state, and local agencies to enforce environmental laws and policies and provides guidance to property owners, developers, and local governments on regulatory requirements.
The CMPA allows for minor projects impacting less than 0.1 acres to be authorized by the Commissioner of Natural Resources on behalf of the CMPC following a review by mail. However, any CMPC member can request that a minor project be reviewed at a full meeting open to the public. The CMPC typically meets every two months at a location in one of the six ocean-facing counties, with a variable schedule depending on the projects in the queue and the availability of committee members.
Despite the protections offered by the CMPA, Georgia's coastal marshlands continue to face threats from encroaching development and rising sea levels. Conservation efforts, such as those led by the Georgia Conservancy and the South Atlantic Salt Marsh Initiative (SASMI), aim to protect and restore coastal marshlands, ensuring the long-term abundance, health, and resilience of these vital ecosystems.
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The importance of salt marshes for Georgia's wildlife
Georgia's salt marshes are some of the most biologically productive natural systems on Earth. They are home to a diverse array of wildlife, including plants, birds, fish, shellfish, crustaceans, reptiles, and mammals. The marshes provide essential habitats and resources for these organisms, supporting a thriving ecosystem.
The marshes are characterized by their unique ecological zones, including the low marsh, high marsh, and marsh border. The low marsh, which makes up the majority of the southern marshlands, is flooded for several hours each day during high tide. It is in this zone that cordgrass grows, reaching heights of 1 to 3 feet. The high marsh, on the other hand, has sandy soil that is only covered with water for an hour or less during high tide. The high salt concentration in this zone makes it challenging for plants to survive, except for salt-resistant species like glasswort, saltwort, and salt grass. The marsh border, located at a higher elevation, experiences fewer seawater floods, resulting in a very low salt concentration. This zone is inhabited by plant communities, including marsh elder.
The salt marshes are a vital nursery area for economically important species such as blue crabs, oysters, shrimp, and fish. These marshes provide shelter and protection for young marine life, allowing them to hide from predators. In addition, the marshes serve as a source of food for these organisms, as the tides bring in nutrients from estuaries, nourishing the grasses that, in turn, sustain marine life. The marshes also support a diverse range of bird species, including birds that feed on the abundant fish and shrimp populations.
Georgia's salt marshes also play a crucial role in filtering pollutants from the water. They act as natural buffers against offshore storms, reducing the potential damage from large storm-spawned waves and tides. This protective function is essential for safeguarding the coastline and minimizing property damage during storms.
Conservation efforts, such as the Coastal Marshlands Protection Act, have been implemented to protect Georgia's salt marshes from development threats and rising sea levels. These initiatives recognize the ecological, cultural, and historical significance of the marshes, aiming to ensure their long-term health and resilience.
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The history of human activity in the marshes
Georgia's salt marshes have been occupied by humans since 500 AD, beginning with Native Americans. In the mid-1700s, enslaved people cultivated rice fields and created a system of dykes that still exist today. In the mid-1900s, the area became a dumping ground for industries along the Savannah River.
The Coastal Marshlands Protection Act was passed in 1970 to prevent damage from a proposed phosphate mining operation and other industrial activities. The Act includes marshlands, intertidal areas, mudflats, tidal water bottoms, and salt marshes under its jurisdiction. It provides the state government with the authority to protect tidal wetlands and manage structures and activities in these areas.
Georgia's salt marshes are facing an existential threat from rising sea levels and encroaching development. Conservation efforts are focused on protecting and restoring coastal marshland with historical, cultural, and spiritual significance to local communities. The goal is to ensure the long-term abundance, health, and resilience of the marshes by addressing threats such as sea level rise and pollution.
The City of Savannah, for example, is working to preserve the area and create a passive recreational park open to the public. Additionally, the Georgia Conservancy, in partnership with Chatham County and the South Atlantic Salt Marsh Initiative (SASMI), aims to protect and restore coastal marshland. SASMI's goal is to ensure the long-term health and resilience of the approximately 1 million acres of coastal marshland along the South Atlantic coastline.
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Restoration efforts and their impact
Georgia's salt marshes are some of the most biologically productive natural systems globally, producing nearly 20 tons of biomass per acre. They are home to several species, including blue crabs, oysters, shrimp, and other economically important fish and shellfish. Salt marshes also help filter pollutants from the water, sequester and store carbon, and act as buffers against offshore storms, thereby reducing potential damage from large storm-spawned waves and tides.
Georgia's salt marshes have been facing an existential threat from rising sea levels and encroaching development. As sea levels rise, salt marshes are at risk of being drowned or forced to migrate inland, where they often face barriers to their movement, such as seawalls, roads, and other infrastructure. To address these challenges, various restoration efforts have been undertaken by local and federal agencies, such as the Georgia Conservancy, the South Atlantic Salt Marsh Initiative (SASMI), and the Army Corps of Engineers.
One of the key restoration efforts has been the closure of man-made cuts in the salt marshes. These cuts, originally made for logging and navigation channels, disrupted the natural tidal flow and caused issues such as inconsistent water flow, sediment buildup, and salt- and freshwater imbalance, harming the ecosystem and wildlife. The Army Corps of Engineers has successfully closed some of these cuts, improving water flow and restoring natural features like banks and sandbars.
Another initiative is the Georgia Native Seed Network, which received $450,000 in funding to help restore and conserve the salt marshes. The goal of this project is to conserve and restore the diverse plant communities found in the salt marshes, including salt-resistant species such as glasswort, saltwort, and salt grass.
The Georgia Coastal Management Program has also played a crucial role in restoration efforts by providing funding for pre-construction data collection and the initial phase of the restoration project. This phase has already shown improvements in water flow and the return of natural features.
The impact of these restoration efforts has been positive, with initial results showing improvements in water flow and the restoration of natural features. These projects emphasize the vital role of marshes as ecological buffers against rising sea levels and as essential habitats for coastal wildlife. By restoring the natural tidal flow and addressing the issues caused by man-made cuts, the health and resilience of the salt marsh ecosystem are being improved, ensuring the long-term abundance and health of Georgia's coastal marshlands.
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Frequently asked questions
It is unclear exactly how much of Georgia's salt marshes are polluted, but they are facing an existential threat from encroaching development and rising seas.
The logging industry has caused decades of environmental damage to Georgia's salt marshes.
The Georgia Conservancy, in partnership with Chatham County and the South Atlantic Salt Marsh Initiative (SASMI), is working to identify opportunities to protect and restore coastal marshland.
Georgia's salt marshes are some of the most biologically productive natural systems on Earth. They are home to Spartina alterniflora, or smooth cordgrass, which is very salt-tolerant.
Georgia's salt marshes provide shelter, food, and nursery grounds for many of the state's commercial and recreational fish species. They also enhance water quality by filtering polluted stormwater runoff.
