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Top Down/ Bottom Up Cellular Shade - White (31x64) Price Comparison
| Store | Description | Price | Visit |
|---|---|---|---|
 | $ 49.99 | Visit Store |
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Where to Buy Top Down/ Bottom Up Cellular Shade - White (31x64)
FAQ about Top Down/ Bottom Up Cellular Shade - White (31x64)
what does "top down and bottom up effects" mean when talking about beetles in a creek?
We did a science project where we tested the effects of light and grazers on algal growth and then did a chlorophyll analysis. this was supposed to be looking at top down vs bottom up effects? what does that mean?
Answer
In ecology, top down control refers to when a top predator controls the structure/population dynamics of the ecosystem. The classic example is of kelp forest ecosystems. In such ecosystems, sea otters are a keystone predator. They prey on urchins which in turn eat kelp. When otters are removed, urchin populations grow and reduce the kelp forest creating urchin barrens. In other words, such ecosystems are not controlled by productivity of the kelp but rather a top predator.
Bottom up control in ecosystems refers to ecosystems in which the nutrient supply and productivity and type of primary producers (plants and phytoplankton) control the ecosystem structure. An example would be how plankton populations are controlled by the availability of nutrients. Plankton populations tend to be higher and more complex in areas where upwelling brings nutrients to the surface.
what is the difference between top-down and bottom-up control on a ecosystem?
what is the difference between top-down and bottom-up control on a ecosystem and what are some of the pros and cons for each one
Answer
Top down control refers to when a top predator controls the structure/population dynamics of the ecosystem. ( cit.)
Bottom up control in ecosystems refers to ecosystems in which the nutrient supply and productivity and type of primary producers (plants and phytoplankton) control the ecosystem structure. ( cit.)
See "Ecological" ( incl.some examples for pro/con )
http://www.answers.com/topic/top-down-and-bottom-up-design
and this site:
http://books.google.de/books?id=Y19ZuVNdRwIC&pg=PA196&lpg=PA196&dq=ecosystem%2B%22bottom-up+control%22%2Bdefinition&source=web&ots=CSf0ggb8_U&sig=YUX2QvyhwRo2-1v5HgrBsrv2u0E&hl=de&sa=X&oi=book_result&resnum=10&ct=result
broom stuck inside door bottom down and top against wall in closet?
There are no hinges outside door broom is lodged inside closet bottom of broom down and top must be against back wall what can i use under the door to move the broom that would be strong enough to move it? desperate must get in this room by tomorrow my work materials are in this room. Thanks so much please help
Answer
Try a steel ruler. Try a coat hanger. Try a poker from the fireplace (if you have one). Frustrating situation for you. Good luck.
what does "top down and bottom up effects" mean when talking about beetles in a creek?
We did a science project where we tested the effects of light and grazers on algal growth and then did a chlorophyll analysis. this was supposed to be looking at top down vs bottom up effects? what does that mean?
Answer
In ecology, top down control refers to when a top predator controls the structure/population dynamics of the ecosystem. The classic example is of kelp forest ecosystems. In such ecosystems, sea otters are a keystone predator. They prey on urchins which in turn eat kelp. When otters are removed, urchin populations grow and reduce the kelp forest creating urchin barrens. In other words, such ecosystems are not controlled by productivity of the kelp but rather a top predator.
Bottom up control in ecosystems refers to ecosystems in which the nutrient supply and productivity and type of primary producers (plants and phytoplankton) control the ecosystem structure. An example would be how plankton populations are controlled by the availability of nutrients. Plankton populations tend to be higher and more complex in areas where upwelling brings nutrients to the surface.
what is the difference between top-down and bottom-up control on a ecosystem?
what is the difference between top-down and bottom-up control on a ecosystem and what are some of the pros and cons for each one
Answer
Top down control refers to when a top predator controls the structure/population dynamics of the ecosystem. ( cit.)
Bottom up control in ecosystems refers to ecosystems in which the nutrient supply and productivity and type of primary producers (plants and phytoplankton) control the ecosystem structure. ( cit.)
See "Ecological" ( incl.some examples for pro/con )
http://www.answers.com/topic/top-down-and-bottom-up-design
and this site:
http://books.google.de/books?id=Y19ZuVNdRwIC&pg=PA196&lpg=PA196&dq=ecosystem%2B%22bottom-up+control%22%2Bdefinition&source=web&ots=CSf0ggb8_U&sig=YUX2QvyhwRo2-1v5HgrBsrv2u0E&hl=de&sa=X&oi=book_result&resnum=10&ct=result
broom stuck inside door bottom down and top against wall in closet?
There are no hinges outside door broom is lodged inside closet bottom of broom down and top must be against back wall what can i use under the door to move the broom that would be strong enough to move it? desperate must get in this room by tomorrow my work materials are in this room. Thanks so much please help
Answer
Try a steel ruler. Try a coat hanger. Try a poker from the fireplace (if you have one). Frustrating situation for you. Good luck.
