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Lake Pátzcuaro

geography Maturity 5-7 Next article →

Lake Pátzcuaro is a significant body of water in Michoacán, Mexico. It sits within the municipality of Pátzcuaro at an elevation of 2,035 meters. The lake is located inside an endorheic basin. An endorheic basin is a closed drainage system. This means the water does not flow out to the sea. Instead, the water stays within the basin. The lake itself covers 126.4 square kilometers. It is surrounded by volcanic mountains with very steep slopes.

The geography of this area is shaped by volcanic activity. The basin was formed by volcanic origins. In the past, this lake was part of a larger hydrological system. It was connected to Lake Cuitzeo and Lake Zirahuén. Those lakes once drained into the Lerma River. Today, the system is different. Lake Pátzcuaro, Lake Cuitzeo, and Lake Zirahuén are now closed basins. However, ecologists still consider Pátzcuaro a sub-basin of the larger Lerma-Chapala basin. The entire watershed area covers 929 square kilometers. This watershed stretches 50 kilometers from east to west. It also reaches 33 kilometers from north to south.

Extensive wetlands surround the lake. These wetlands have been a Ramsar site since 2005. A Ramsar site is a wetland of international importance. The vegetation here is very dense. Cattails and other reedy plants are the dominant types. These plants can grow in stands over 2 meters tall. Common plant genera include Typha, Scirpus, Eleocharis, and Cyperus. Aquatic plants like Nymphaea mexicana are also common. These plants provide a home for many animals.

The wetlands support a vast amount of wildlife. Nearly 200 bird species live in these habitats. Some birds live there all year. Others are migrating waterfowl that visit temporarily. The black-polled yellowthroat is an endemic species here. Endemic means it is found only in this specific area. Some species are harder to find. The yellow rail has not been seen since 1964. The slender-billed grackle is also presumed extinct. Many animals in the water are also unique to this system. These include the Pátzcuaro chub and the Pátzcuaro allotoca. The Lake Pátzcuaro salamander is another endemic resident.

The history of the basin is tied to the Purépecha people. They established the basin as the heartland of the Tarascan state. This state was a powerful rival to the Aztec Empire. Important Purépecha centers included Ihuatzio, Tzintzuntzan, and Pátzcuaro. You can still visit ancient temple ruins called yacatas in Ihuatzio. Today, many towns sit along the lake shore. Pátzcuaro is on the southeastern shore. Quiroga is a thriving market town. Tzintzuntzan is a market town near ruins. Other towns include Erongarícuaro and La Laguna.

Several islands are located within the lake. Janitzio is an island with tourist facilities. Pacanda is the largest and flattest island. It has cabins available for rent. Other islands include Jaracuaro, Yunuen, Tecuena, and Uranden. Tecuena is a sparsely populated island. These islands add to the diverse landscape of the lake.

Human activity has caused major environmental changes recently. Over the last 50 years, the lake has faced many threats. Logging and agriculture in the watershed have caused siltation. Siltation is when soil fills the water. This happens at a rate of 1 centimeter per year. This adds about 1.2 million cubic meters of silt annually. Water diversion for cities and farms has also happened. This reduced the lake size by 40 square kilometers. It also lowered the depth by 2.6 meters. The lake's average depth is 5 meters. Its maximum depth is 12 meters.

Forests in the surrounding watershed are changing too. The area has different types of vegetation based on height. Xeric scrub grows between 1,920 and 2,100 meters. Pine and oak forests grow between 2,100 and 2,400 meters. Higher peaks have pure pine-oak forests. These are part of a larger ecoregion. However, over 10,000 hectares of forest have been lost. This happened through logging, fires, and clearing for ranching. Efforts to clean the lake face many challenges. Since 2006, 5 billion MXN has been spent on these efforts. Yet, many people in nearby towns still live in poverty.

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