Ecology B/C

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Re: Ecology B/C

Postby tm-scioli » October 17th, 2016, 1:37 pm

An invasive plant has taken over a plot of grassland on a ranch. The specie is spiny and allelopathic, but whenever the owner tills up the soil, sprays herbicides, or otherwise eliminates the problem, the plants that grow back are just other disturbance selected invasive species. Describe 2 possible solutions to the problem.

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Re: Ecology B/C

Postby gavinnupp » October 20th, 2016, 11:42 pm

1. Use prolonged germination tarps and glyphosate to eliminate all seeds within the soil, and reseed with a native seed mix
2. Set it on fire (controlled burns are a common method of control in praries)
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Re: Ecology B/C

Postby tm-scioli » October 21st, 2016, 7:23 am

1. yup, I would just mention perennial plants (probably bunchgrasses)
2. that would usually work unless the other invasive species that grow back are fire resistant/resprout easily after fires
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Re: Ecology B/C

Postby Zioly » October 23rd, 2016, 1:05 pm

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
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Re: Ecology B/C

Postby SenseiSushi » October 23rd, 2016, 2:42 pm

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
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.
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Postby tm-scioli » October 23rd, 2016, 2:48 pm

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?

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Re: Ecology B/C

Postby Magikarpmaster629 » October 23rd, 2016, 2:56 pm

Don't mind me, just adding in the subject line.
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Re: Ecology B/C

Postby SenseiSushi » October 23rd, 2016, 3:05 pm

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.
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Re: Ecology B/C

Postby Zioly » October 23rd, 2016, 3:28 pm

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
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.
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Re: Ecology B/C

Postby SenseiSushi » October 24th, 2016, 7:43 am

Which of the biogeochemical cycles is solely sedimentary?
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Re: Ecology B/C

Postby tm-scioli » October 24th, 2016, 4:15 pm

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

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Re: Ecology B/C

Postby Zioly » October 24th, 2016, 4:22 pm

Which of the biogeochemical cycles is solely sedimentary?
Question for clarification: Are sedimentary cycles ones that involve only abiotic factors? Meaning, no bacteria/plants?
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Re: Ecology B/C

Postby SenseiSushi » October 24th, 2016, 7:47 pm

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.
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Re: Ecology B/C

Postby Zioly » October 25th, 2016, 5:45 pm

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! :D So it would be
tm scioli got it first.
Sulfur and phosphorus?
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Re: Ecology B/C

Postby SenseiSushi » October 25th, 2016, 6:05 pm

I'm pretty sure phosphorus is. Is sulfur all sedimentary too?
tm scioli got it first.
Sulfur and phosphorus?
Correct!
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.
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