GÖLYAZI (GOLYAZI)

-Wetland-

-Ecosystem-

WHAT IS GÖLYAZI?

OVERALL INFORMATION

• Gölyazı is situated on a small peninsula formed by two low hills on the shore of Lake Uluabat. One of the hills contains the remains of the necropolis of the ancient city of Apollonia, named after the Greek god Apollo; the second hill becomes an island when the lake rises and is accessible via a long, narrow stone bridge.

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• Most of the current inhabitants of Gölyazı live on the island, in historic Greek houses with brick walls. Their livelihoods today are based on agriculture, fishing, and tourism.

HISTORY OF GÖLYAZI

• Under Ottoman rule, Gölyazı existed as a town where Christian and Muslim Ottoman citizens lived together, but the Christian population was predominant. The Muslim population consisted of Manavs. The people were engaged in fishing, silkworm breeding, and trade. Products such as timber, corn, and wheat were transported by sailboats on the lake to the Susurluk River and from there to the Marmara Sea. Gölyazı, being located inland from the main road, was spared from destruction during World War I.

HISTORY OF GÖLYAZI

• During the Republican era, as a result of the population exchange between Turkey and Greece, the Greek population who migrated to Greece were settled in the town of Kesriye, located on a small promontory extending towards Lake Kesriye. Families who migrated from Thessaloniki were settled in the houses vacated by the Greek families. The name "Apolyont" was changed to "Gölyazı" after the Republic. It became a town on July 12, 1992, gaining municipality status. In 2009, the municipal organization was closed down. Gölyazı, along with its Merkez and Bayır neighborhoods, became a neighborhood of Nilüfer Municipality.

WHAT IS OUR REASON� TO VISIT GÖLYAZI?

• Gölyazı is a great place to investigate the interaction between sea creatures, migrator birds and the vegetation. It features wetland ecosystem and a natural habitat for a vast variety of birds, as they’ll be mentioned later.

Gölyazı is Famous for Yaren the Stork

• Speaking of birds, let’s not forget to mention Yaren the Stork. Yaren the Stork’s story is a fairytale friendship between fisherman Adem Yılmaz and a stork named "Yaren" in Eskikaraağaç Stork Village in Karacabey, Bursa, a friendship that has been ongoing since 2010 and is repeated every spring. Every year, Yaren returns from migration, lands on Uncle Adem's boat, goes fishing with him, and is fed by his hand.

DETAILS

• Every March, Yaren returns from migration, settles in her nest in Eskikaraağaç village, and lands on fisherman Adem Yılmaz's boat.
• In this 15th meeting, which took place in 2026, Yaren spent time with fisherman Adem Yılmaz on the lake.

DETAILS

• The meetings of Yaren the Stork and Uncle Adem can be watched live 24 hours a day at yarenleylek.com. It is known that Yaren raises chicks in the nest with her mate "Nazlı". Although Yaren the Stork usually arrives at the beginning of March, she can sometimes be late depending on the weather conditions, and this worries the villagers and Uncle Adem.

Yaren the Stork and Uncle Adem

• Speaking of which, Gölyazı is a bird paradise which attracts many birdwatchers. Why is it so important for birds? Let’s find out!

1. A Strategic Stop on Migration Routes

• Turkey acts as a bridge for birds migrating between Europe, Asia, and Africa. Gölyazı is situated directly on the Northwest Migration Route. For thousands of migratory birds, it serves as a safe resting spot to recover from long flights and it’s a crucial refueling station where they can find abundant food before continuing their journey.

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2. Sanctuary for Endangered Species

• The area provides a habitat for several species that are globally threatened or rare. It is particularly famous for:
• Pygmy Cormorant: One of the most significant breeding colonies in the world is found here.
• Dalmatian Pelican: These massive, rare birds use the lake for feeding and wintering.

3. Rich Food Sources and Wintering

• Because Lake Uluabat is relatively shallow and nutrient-rich, it supports a massive population of fish and plankton.
• Abundant Prey: This creates a buffet for fish-eating birds.
• Mild Winters: Since the lake rarely freezes completely, it becomes a winter sanctuary for hundreds of thousands of ducks and Eurasian Coots fleeing the freezing temperatures of the north.

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Summary

• In the eyes of an ornithologist (or a bird), Gölyazı is a combination of a maternity ward, a high-end restaurant, and a luxury hotel on a very long and dangerous highway. Without such wetlands, many bird populations would face a drastic decline.

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WHAT IN TARNATION IS WETLAND ECOSYSTEM?

Wetland ecosystems are natural or artificial, freshwater, brackish, or saltwater areas such as swamps, marshes, peatlands, river deltas, or shallow lakes where water covers the land surface year-round or seasonally. These areas, which are the intersection of terrestrial and aquatic life, are among the ecosystems with the highest biodiversity, act as carbon sinks to regulate the climate, and maintain the natural balance by storing floodwaters.

SWAMPS

SWAMPS

• A swamp is a low-lying, permanently waterlogged wetland dominated by trees and woody plants, acting as a natural sponge that filters water and prevents flooding. Its ecosystem features nutrient-rich soil and, depending on location, hosts diverse wildlife.

THE CHARACTERISTICS OF SWAMP ECOSYSTEMS

• Location: Found worldwide, often near major rivers or slow-flowing water, with tropical areas often featuring extensive swamp forests.
• Water Type: Swamps can be freshwater or saltwater.

USAGE EXAMPLES OF SWAMPS

• Ecological Use: Swamps are natural nurseries for many species, providing essential habitat for reproduction.
• Economic/Human Use: They are utilized for harvesting timber, fishing, and collecting non-timber forest products.
• Environmental Protection: They prevent erosion and act as natural water purification systems by trapping pollutants, protecting surrounding areas from storm surges.

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MARSHES

MARSHES

• A marsh is a treeless, nutrient-rich wetland dominated by herbaceous plants that typically occurs in shallow water, such as along lake edges, rivers, or in coastal areas. As highly productive ecosystems, they act as natural sponges for flood control, filter pollutants to maintain water quality, and sequester carbon, offering critical habitat for birds, fish, and wildlife. 

THE CHARACTERISTICS OF MARSH ECOSYSTEMS

• Hydrology: Water levels can fluctuate daily or seasonally, with water depth usually ranging from a few centimeters to a meter.
• Soil: Characterized by waterlogged, often anaerobic soils, which are high in organic matter and nutrients.

THE CHARACTERISTICS OF MARSH ECOSYSTEMS

• Vegetation: Dominated by emergent, herbaceous plants that can withstand waterlogged soil.
• Fauna: They support high biodiversity, including waterfowl, fish, shellfish, and mammals such as muskrats. 

WHAT ARE THEIR FUNCTIONS?

• Coastal Protection: Salt marshes protect coastlines from erosion and surges, such as along the Mississippi River Delta and the Gulf Coast.
• Biodiversity Hotspots: They provide critical breeding grounds for wildlife.

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PEATLANDS

PEATLANDS

• Peatlands are waterlogged wetlands where partially decomposed plant material accumulates over thousands of years, storing 30% of its soil carbon. These vital ecosystems act as natural sponges, filtering water and providing habitats for specialized biodiversity. Key types include bogs and fens.

THE PEATLAND ECOSYSTEM

• Formation & Structure: They are waterlogged, acidic, and nutrient-poor, the anaerobic conditions prevent dead plant matter from fully decomposing.
• Carbon Storage: They hold twice as much carbon as all the world's forests combined, acting as crucial natural carbon sinks that combat climate change.

THE PEATLAND ECOSYSTEM

• Biodiversity: They host specialized, rare flora and fauna, including carnivorous plants like sundews, unique invertebrates, waterbirds, and butterflies.
• Hydrology: They regulate water flows, reducing flood risks by absorbing water and slowly releasing it.

RIVER DELTAS

RIVER DELTAS

• A river delta is a dynamic landform created where a sediment-laden river enters a standing body of water like a sea or lake, causing sediment deposition that builds new land. Its ecosystem is a highly productive, bio-diverse coastal wetland comprising distributary channels, mangroves, and floodplains that provide crucial habitats, water filtration, and flood mitigation. 

THE CHARACTERISTICS OF RIVER DELTA ECOSYSTEMS

• Ecosystem Components: They act as critical nurseries for fish and shellfish, supporting high biodiversity.
• Biodiversity: They are a home to diverse wildlife, including aquatic species, birds, and predators like tigers in mangrove areas.

USAGE AND IMPORTANCE

• Agriculture: Due to nutrient-rich soil, deltas are major agricultural hubs, supporting crops like rice and wheat.
• Human Settlement: Nearly 25% of the global population lives on or near deltas, which provide fertile land and fresh water.

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USAGE AND IMPORTANCE

• Transportation: They serve as major shipping hubs and ports.
• Flood Mitigation: Wetlands within the delta act as natural buffers, absorbing excess water from storms and floods.
• Ecological Significance: They act as vital breeding and nursery grounds for fish.

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SHALLOW LAKES

SHALLOW LAKES

• Shallow lakes are productive, nutrient-rich ecosystems that are typically under 5 meters deep, defined by sunlight reaching the lakebed. This light exposure fuels widespread plant growth and supports a high diversity of wildlife. Because of their depth, these systems stay well-mixed, maintaining a constant, direct exchange between the sediment and the water.

ECO-DYNAMİCS

• Definition & Characteristics
• A lake is classified as "shallow" if it is less than 4.6 meters deep or if 80% of its area allows sunlight to reach the bottom. This widespread light penetration makes the entire lakebed potentially habitable for aquatic life.
• Alternative Stable States
• These lakes typically exist in one of two distinct conditions:
• Clear-Water State: High visibility, dominated by rooted, submerged aquatic plants that stabilize the sediment.
• Turbid-Water State: Murky water, dominated by dense algae blooms that block light and suppress plant growth.

ECO-DYNAMİCS

• Shallow lakes are highly productive, "polymictic" (well-mixed) systems that avoid thermal layering, allowing for rapid nutrient recycling between the sediment and the water. This constant nutrient availability fuels a complex web of biodiversity, ranging from various plant types to amphibians and fish.
• Nutrient Dynamics: Lack of stratification (layering) leads to efficient, high-rate nutrient cycling.
• Biological Richness: They support a dense variety of life, including submerged and floating vegetation, insects, and vertebrates.
• Avian Importance: They act as essential refuges and nurseries for migratory and local waterfowl.

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USAGE EXAMPLES

• Wildlife Refuges: Shallow lakes act as critical habitats for birds like grey ducks and bitterns.
• Flood Control: These water bodies and their surrounding wetlands store excessive water during storms, reducing downstream flood risks.
• Recreation: They are used for fishing, birdwatching, and nature study.

WHY SHOULD WE PROTECT THEM?

• Wetlands are often called the "kidneys" and the "supermarkets" of nature. They are not just scenic spots; they are functional powerhouses that support life on Earth in ways that are often invisible to the naked eye.

1. Reservoirs of Biodiversity�

• Wetlands are home to or breeding grounds for 40% of all world species. After tropical rainforests, they are the most biologically productive ecosystems on the planet. Losing them means a direct collapse of thousands of plant and animal species.

2. Natural Water Treatment

• Wetlands act as giant filters. They absorb pollutants through their vegetation. By the time water passes through a wetland and into our groundwater or rivers, it is significantly cleaner.

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3. Climate Change Mitigation (Carbon Sinks)

• Wetlands, particularly peatlands and coastal marshes, are incredibly efficient at storing carbon. In fact, they store more carbon per square meter than many forests. When we drain wetlands, that carbon is released back into the atmosphere, accelerating global warming.

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4. Disaster Risk Reduction

• Wetlands act like a giant sponge:
• Flood Control: During heavy rains, they absorb excess water, preventing nearby towns and farms from flooding.
• Erosion Control: Coastal wetlands break the energy of storm surges and waves, protecting shorelines from washing away.

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5. Economic and Social Survival

• Humanity depends on these areas for more than just views:
• Livelihood: They provide water for irrigation and sustain fishing industries.
• Eco-tourism: As mentioned to be seen in Gölyazı, birdwatching and nature photography bring vital income to local communities.

HOW DO PEOPLE DAMAGE THESE LOCATIONS, AGAIN?

• Human activity is the primary driver of wetland degradation. Because these areas are often seen as "wasteland" or "swamps" rather than productive ecosystems, they are frequently targeted for development or misused.

1. Drainage and Land Reclamation

• This is perhaps the most direct form of destruction. People drain the water from wetlands to convert the area into:
• Agricultural Land: That means turning marshes into crop fields.
• Urban Development: Building houses, roads, or industrial zones on top of filled-in wetlands. Once the water is gone, the ecosystem collapses, and the stored carbon is released into the atmosphere.

3. Water Diversion and Over-extraction

• Humans often interfere with the natural flow of water:
• Dams and Dykes: Building dams upstream can starve a wetland of the water and sediment it needs to survive.
• Groundwater Pumping: Excessive pumping for irrigation or city use can lower the water table, causing the wetland to dry up from below.

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4. Introduction of Invasive Species

• People often accidentally or intentionally introduce non-native plants or animals. For example:
• Invasive plants (like certain types of reeds or water hyacinths) can grow uncontrollably, blocking sunlight and oxygen for native species.
• Non-native fish can outcompete local species, disrupting the balance that birds depend on for food.

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5. Climate Change (Human-Induced)

• While climate change is a global phenomenon, it is driven by human activity. It damages wetlands through:
• Rising Sea Levels: Salty seawater can flood freshwater coastal marshes, killing the plants and animals that aren't adapted to salt.
• Extreme Droughts: Increased evaporation and lack of rainfall can turn a vibrant wetland into a dry cracked bed.

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WHY SHOULD YOU CARE ABOUT IT?

• When a wetland is damaged, it loses its ability to protect us from floods and clean our water. It’s a classic case of short-term gain (more land for building or farming) leading to long-term pain (water scarcity and natural disasters).

THANK YOU FOR LISTENING!