Ramsar Sites of Turkey - Ramsar Convention on Wetlands
Ramsar Sites of Turkey - Ramsar Convention on Wetlands
Ramsar Sites of Turkey - Ramsar Convention on Wetlands
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The lake with its immediate envir<strong>on</strong>ment was designated as Natural Site <str<strong>on</strong>g>of</str<strong>on</strong>g> 1 st Degree in<br />
1981. Ministry <str<strong>on</strong>g>of</str<strong>on</strong>g> Culture is resp<strong>on</strong>sible for the activities within the natural site.<br />
Works to include the 120-hectare area <str<strong>on</strong>g>of</str<strong>on</strong>g> reed beds, wet meadow areas and muddy<br />
<br />
c<strong>on</strong>tinue. In the meantime land tenure <str<strong>on</strong>g>of</str<strong>on</strong>g> the menti<strong>on</strong>ed area is handed over to Uni<strong>on</strong> for<br />
<br />
HYDROLOGICAL ASPECTS<br />
Precipitati<strong>on</strong> in Manyas Basin and its immediates, where summers are hot and dry and<br />
winters are warm and rainy, generally occur between October and April. The highest<br />
precipitati<strong>on</strong> m<strong>on</strong>ths are December and January. 1/3 <str<strong>on</strong>g>of</str<strong>on</strong>g> the 700-mm mean precipitati<strong>on</strong><br />
falls in these two m<strong>on</strong>ths. July and August are the driest m<strong>on</strong>ths. The coldest m<strong>on</strong>th is<br />
January and the lowest temperature is recorded to be - <br />
m<strong>on</strong>ths are July<br />
<br />
-75 percent.<br />
Marmara (transiti<strong>on</strong>) climate prevails in the regi<strong>on</strong>.<br />
Water level in Lake Manyas 3 m). These<br />
variati<strong>on</strong>s are closely related to the rainfall amounts in the basin. Melting snows and<br />
<br />
successive dry and wet periods last 19-20 years.<br />
After seawalls were c<strong>on</strong>structed al<strong>on</strong>g the southern coast <str<strong>on</strong>g>of</str<strong>on</strong>g> the lake and regulators<br />
<br />
water level. The highest lake water level was measured as 17m in 1996 and the lowest<br />
water level as 14.4m in 1983. The lake water level reaches its highest level during<br />
March-April and its lowest level during September-October, l<strong>on</strong>g-term averages indicate.<br />
Following interference in the water regime in 1992, the water level has become average<br />
1m higher particularly in summer and falls. The main reas<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> the remarkable water<br />
level difference between summers and falls is drainage from the lake for agricultural<br />
activities. The water pumped out <str<strong>on</strong>g>of</str<strong>on</strong>g> the lake is used for agriculture in Karacabey Plain.<br />
In 30 years, developing industry and poultry resulted in degradati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> water quality. The<br />
degradati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> lake water quality and natural water regime affected the ecological cycle<br />
and some species got receded from the site.<br />
GEOLOGICAL ASPECTS<br />
Morphological structure <str<strong>on</strong>g>of</str<strong>on</strong>g> Manyas Basin is closely related to its geological structure. High<br />
<br />
formed over old metamorphic rocks such as crystallized limest<strong>on</strong>e and granite. While<br />
plains are covered with quaternary old alluvi<strong>on</strong>s, lower plateaus at skirts dispend over<br />
low-resistance Neocene old units covering vast areas.<br />
18