Ecology B/C

[tm-scioli]

I think I read somewhere that R-selected are only found in disturbed areas and that K-selected species eventually become the climax community. Do you know if that's true?

[Magikarpmaster629]

Don't mind me, just adding in the subject line.

[SenseiSushi]

I think I read somewhere that R-selected are only found in disturbed areas and that K-selected species eventually become the climax community. Do you know if that's true?

K-selected organisms are more likely to be found in climax communities (like redwoods in the old growth forests of the West Coast) because they require stable conditions to grow whereas r-selected organisms can be found in almost any stage of ecological succession.

[Zioly]

I'm very sorry if this isn't allowed, but seeing as Gavinupp hasn't responded yet and I'm itching to start studying...

1. Describe K-selective and r-selective organisms.
2. Give 2 examples of each

Answer (Click to Show Hidden Text)

r-selective organisms are those that put the majority of their energy into rapid growth and reproduction while K-selective organisms place most of their energy into sustained growth and generally have fewer offspring. 

Mosquitos and frogs are examples of r-selective organisms whereas humans and elephants are examples of K-selective organisms.

Correct! Your go!

[SenseiSushi]

Which of the biogeochemical cycles is solely sedimentary?

[tm-scioli]

I'm pretty sure phosphorus is. Is sulfur all sedimentary too?

[Zioly]

Which of the biogeochemical cycles is solely sedimentary?

Question for clarification: Are sedimentary cycles ones that involve only abiotic factors? Meaning, no bacteria/plants?

[SenseiSushi]

Question for clarification: Are sedimentary cycles ones that involve only abiotic factors? Meaning, no bacteria/plants?

I meant a cycle that takes place only in the solid state without any portion taking place in the atmosphere.

[Zioly]

Question for clarification: Are sedimentary cycles ones that involve only abiotic factors? Meaning, no bacteria/plants?

I meant a cycle that takes place only in the solid state without any portion taking place in the atmosphere.

Oh! I get it now! So it would be

tm scioli got it first. (Click to Show Hidden Text)

Sulfur and phosphorus?

[SenseiSushi]

I'm pretty sure phosphorus is. Is sulfur all sedimentary too?

tm scioli got it first. (Click to Show Hidden Text)

Sulfur and phosphorus?

Correct! (Click to Show Hidden Text)

Phosphorus is the correct answer. Sulfur isn't solely sedimentary as it is present as sulfur dioxide (a major source for acid rain that is formed from the combustion of coal) and is also emitted from volcanoes.

tm-scioli's turn!