limno lec 7 lakes

littoral zone

shallow water of a lake, along the edge where flowering plants are rooted

limnetic zone

offshore zone of a lake. comprised of water that receives enough light to support photosynthesis

benthic zone

the bottom, substrate rich part of a lake

photic zone

zone of a lake that receives sunlight. usually the top layer

aphotic zone

zone of the late that does not receive sunlight. usually the deeper layer

compensation point

place within a water column where photosynthesis and respiration are equal

eutrophic lakes

• the warmer the water, the less dissolved oxygen the water can retain

• DO increases around the epilimnion that drops dramatically

• during the day when photosynthesis occurs, there’s a high DO content

• during the night, the high water temp allows DO to leave

oligotrophic lakes

• DO is relatively high and distributed well