 pressure water ecosystems the lentic ecosystem first the contents the definition of lentic ecosystem vertical stratification in lentic ecosystem primary productivity oxygen supply oligotrophic and eutrophic bodies of lentic ecosystem then the plants and the animal life present in lentic ecosystem so first the what are the definition of lentic ecosystems lentic ecosystem are the actually the fresh water ecosystem with standing water in lentic ecosystem simple definition yeah as a fresh water ecosystem okay standing position for I just kharah that is not flowing that will be called as the lentic ecosystem so it means different types of lakes different ponds and other water bodies in which the water is not flowing that will be the lentic ecosystem in a situation if we look at the fresh water ecosystem there are two types of ecosystems we meet the rotor ecosystems that are flowing water with rivers streams and this is a brooks where the river they are making the rotor ecosystems while the lentic ecosystem is actually a standing water ecosystem such fresh water which is the farm of lakes or ponds or different water bodies where the water is standing that will be called as the lentic ecosystems the important feature of lentic ecosystem is the their stratification lentic ecosystems specially those lentic ecosystems which are present in the temperate regions temperate regions as a region where the winter and summer are present so where the temperate regions where the lentic water bodies they have the vertical stratification if we look at the summer during summer the environmental temperature is high environmental temperature impact ultimately the upper layer of the water and the upper layer of water will also be warm up so now the result is that the upper layer of the water is higher and the higher the temperature means that the density of the water is reduced when the water present in the bottom that is having low temperature and is more dense so the temperature is lower and the higher the density of the water will be lower when the top layer will be higher so both layers are not going to mix with each other so the top layer of the water will not mix with the bottom layer of the water because of which the nutrients, gases will be in the top layer of the top layer and the bottom layer of the bottom layer so the layering of the water that is actually called the vertical stratification during autumn conditions are reversed in autumn and winter what will happen is that the top layer, the atmospheric temperature is low so because of the low temperature the top layer is more cold or the temperature is lower so that will become more dense even the water below will be more dense than the top layer of the water so what will happen is that the more dense water will sink down the more dense water will sit down and the less dense water will come up so this way the water will mix up so we call mixing up is a turnover so when it is a turnover then the water will mix up and the nutrients will mix up and along with that when the gases will mix up then the animals on the bottom layer of the water will be available to the gases and nutrients so normally during the fall when the water will be mixing up during the summer the stratification will happen so the primary productivity of lentic ecosystems so if we look at the lentic ecosystem the primary productivity the primary productivity is the biomass which is synthesized by the autotrophs so the most important autotrophs in water bodies are the algae algae are submerged in different types of plants because of the aquatic plants, some are submerged, some are floating some are emerging so different types of plants are doing photosynthesis there and they are making the biomass so the primary productivity is dependent on the algae and also on the different types of plants so how the oxygen is supplied? oxygen supply can be seen as the low-tech ecosystem that is the flowing water that is related to the lentic ecosystem that is the oxygen deficiency so only those animals can survive which can bear the oxygen stress so the oxygen that is provided by the different types of algae most of the oxygen suppliers are the algae producers and all the producers are usually at the top layer so the water on the bottom will be more deficient of oxygen so the bottom developers will have more oxygen stress so they have the ability to survive with a low concentration of oxygen during autumn, the water layers will be mixed up so the oxygen from the top layer will reach the bottom layer whereas during summer or winter, the mixing will be minimum so the lentic water bodies are called lakes so there are different types we have two major types of lakes the oligotrophic lakes and the eutrophic lakes the oligotrophic lakes are actually those lakes which are nutrient-poor the nutrients deficiency of these lakes ultimately, the nutrient deficiency of these lakes means producers will work there if producers and algae and aquatic plants work there then the animal life will be reduced so the deep and cold water bodies are the oligotrophic lakes whereas the other types of lakes are eutrophic water bodies eutrophic water bodies are those water bodies which have more supply of nutrients which have nutrient abundance due to nutrient abundance, the plants which are algae will bloom there so ultimately, when they grow more, they sometimes grow more because there is eutrophication again, the effect of eutrophication is reversed eutrophication means that the animal life cannot survive there so different types of plants and animals present in the lentic water bodies if we talk about the lentic water bodies, then different types of plants the most important are the different types of algae algae is the nature of planktonic all the algae planktonic, they float with water they keep on floating on the water the other types of plants, if we look at them, they are the floater floating is the same as the leaves floating some are submerged submerged plants are those which are present within the water submerged plants are those which are on the surface of the water and floating plants are those which are floating on the surface of the water so different types of plants are there animal life, if we look at animal life, different types of zooplanktons these are phytoplanktons, algae are phytoplanktons similarly, small ones which we mainly have are unicellular organisms which we call protozones, they are actually the zooplanktons zooplanktons are there different types of invertebrates we will look at invertebrates different types of insects are there different types of worms are there worms are usually present when they are in the water, they are making the benthic plants crabs are there, crayfish is there shrimps, mullus are there different types of animals are surviving in the lentic ecosystem