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Does anybody have a good explanation for the River continuum concept?

Scrambledeggs wrote:Does anybody have a good explanation for the River continuum concept?

Rivers get larger as they near a larger body of water to empty into, and as the width increases, more biota is present. This is because towards the top of the stream, organisms are confined into a small space and larger fish cannot live there. But, as you travel down, you will see more and more biota of varying sizes as there is more physical space.

I have no idea if I'm actually correct but yeah, that's my understanding.

jimmy-bond wrote:

Scrambledeggs wrote:Does anybody have a good explanation for the River continuum concept?

Rivers get larger as they near a larger body of water to empty into, and as the width increases, more biota is present. This is because towards the top of the stream, organisms are confined into a small space and larger fish cannot live there. But, as you travel down, you will see more and more biota of varying sizes as there is more physical space.

I have no idea if I'm actually correct but yeah, that's my understanding.

Isn't it that the composition of feeding methods(scraper,shredder, collector, predator) changes in a predictable way going downstream?

hmmm wrote:

jimmy-bond wrote:

Scrambledeggs wrote:Does anybody have a good explanation for the River continuum concept?

Rivers get larger as they near a larger body of water to empty into, and as the width increases, more biota is present. This is because towards the top of the stream, organisms are confined into a small space and larger fish cannot live there. But, as you travel down, you will see more and more biota of varying sizes as there is more physical space.

I have no idea if I'm actually correct but yeah, that's my understanding.

Isn't it that the composition of feeding methods(scraper,shredder, collector, predator) changes in a predictable way going downstream?

Having taught Earth Science for 9 years, this is a new one on me. It looks (yes, according to Wikipedia!) that there exists a "dynamic equilibrium" (a continuing state of balance) given biotic and abiotic factors within a moving river - I am guessing this has something to do with erosion and deposition of riverbanks as well. It also seems to be a useful way of classifying and organizing organisms and their niches. Just my take on it.

I have been having an issue with my salinometer. I only made three marks for 0, 5, and 10 percent salinity solutions, but they were all only a few millimeters apart. What can I do to make my marks more spread out?
Also, if the beaker that I make my salinometer in is a different size than the beaker that they provide, will it make a difference?

Girlpower05 wrote:I have been having an issue with my salinometer. I only made three marks for 0, 5, and 10 percent salinity solutions, but they were all only a few millimeters apart. What can I do to make my marks more spread out?
Also, if the beaker that I make my salinometer in is a different size than the beaker that they proved, will it make a difference?

1.Use a different sized straw/cylinder/whatever, I think.
2.No, because the density of the solution will still be the same, which is all the salinometer depends on.

Girlpower05 wrote:I have been having an issue with my salinometer. I only made three marks for 0, 5, and 10 percent salinity solutions, but they were all only a few millimeters apart. What can I do to make my marks more spread out?
Also, if the beaker that I make my salinometer in is a different size than the beaker that they provide, will it make a difference?

Using a thinner straw should increase the distance between marks.

It shouldn't make a difference, just make sure that in the smallest possible size, it doesn't touch the bottom.

What's the order of the wastewater treatment process?
Different sites have different answers

hmmm wrote:What's the order of the wastewater treatment process?
Different sites have different answers

Collection --> Screening & Straining --> Chemical Addition --> Coagulation & Flocculation --> Sedimentation & Clarification --> Filtration --> Storage --> Distribution

Rivkaaa wrote:

hmmm wrote:What's the order of the wastewater treatment process?
Different sites have different answers

Collection --> Screening & Straining --> Chemical Addition --> Coagulation & Flocculation --> Sedimentation & Clarification --> Filtration --> Storage --> Distribution

Isn't this potable water treatment?