00:01
See, what are estuarine areas? estuarine areas are those areas where the fresh water, ok, the fresh water and sea water mix together.
00:12
So, basically the area where river and sea mix together.
00:19
Ok, so river is the fresh water and sea is obviously sea water, right.
00:23
So, river they don't usually have the salinity, they don't usually, they are not usually saline, not that saline that we see in sea, they are very saline, right.
00:33
The salinity is high, ok.
00:38
So, in a region, let us say this is a region where we see river water, we see river and we see sea water, ok.
00:48
So, the salinity will keep on fluctuating.
00:52
Now, why it is fluctuating? because the amount salinity is fluctuating, right.
00:58
So, why? because the amount of sea water and river at a particular point of time, it will vary, right.
01:09
It is not always that it will always be constant, so it can not always constant.
01:14
So, the organisms has to adapt, the organism that are living in this area, they have to adapt, ok, to this change.
01:25
Organisms living in this area, they have to adapt, right.
01:29
Moving, this was our very first adaption, our very first difficulty.
01:34
Now, moving on to the second.
01:36
Now, in second, we can know about tidal variation.
01:41
See, you know tides are there in sea water, right.
01:45
So, what are tides? due to tides, see, this actually happens in the region where water is shallow, ok.
01:55
Now, water is shallow and above that the tidal variation may cause rise and drop in the water level, ok.
02:05
So, due to this, the organisms face difficulty because along with the rise and the drop in water, now the nutrition is present in the water.
02:18
So, this, so the organisms, again they have to adapt to this change, ok, because in this habitat, it is not mandatory that the nutrition will also be constant, ok.
02:32
So, nutrition factor may vary due to this, ok.
02:37
So, this was our second point.
02:38
Moving on to the next point...