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Ecology as it relates to Biomass and Population

Discussion of the distribution and abundance of living organisms and how these properties are affected by interactions between the organisms and their environment

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Ecology as it relates to Biomass and Population

Postby Jimmy21 » Thu Apr 21, 2005 7:14 am

1.) How does population density affect death rate?

2.) Why does the biomass in terrestrial ecosystems decease as one proceeds up to higher trophic levels?

3.) Which marine biome has the greatest species richness?



Thank you very much....I would really appreciate the help.....:)
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Postby James » Thu Apr 21, 2005 2:47 pm

In most cases an increase in population denisty leads to a higher death rate, due to increased competition

Because one fox will live on 30 rabbits, but 30 foxes will not live on 30 rabbits- Carnivores need a number of prey to feed on, otherwise not enough energy (only around 10% is passed on) will be available to live.
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Postby biostudent84 » Thu Apr 21, 2005 2:56 pm

James wrote:Carnivores need a number of prey to feed on, otherwise not enough energy (only around 10% is passed on) will be available to live.


About 10% of energy is transferred from the sun to plants. From plants to animals, and from animals to animals is about 1%.
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Postby James » Thu Apr 21, 2005 3:05 pm

biostudent84 wrote:
James wrote:Carnivores need a number of prey to feed on, otherwise not enough energy (only around 10% is passed on) will be available to live.


About 10% of energy is transferred from the sun to plants. From plants to animals, and from animals to animals is about 1%.


Thanx
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Postby MrMistery » Tue Apr 26, 2005 7:24 pm

Kyle, i think you are wrong.
My book says that 1-3% of the sun energy is absorbed by plants. 10% of the energy passes to the next level on the food chain
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
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Postby James » Tue Apr 26, 2005 9:06 pm

Ah, yes that sounds correct.
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Postby mith » Tue Apr 26, 2005 11:53 pm

0.02% according to mine.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr
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Postby Poison » Wed Apr 27, 2005 5:15 pm

MrMistery wrote:My book says that 1-3% of the sun energy is absorbed by plants. 10% of the energy passes to the next level on the food chain


I read a book that says exactly what you wrote.
It matters not how strait the gate
How charged with punishment the scroll
I am the Master of my fate
I am the Captain of my soul.
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Postby biostudent84 » Wed Apr 27, 2005 5:26 pm

Yeah, sorry. I got them backwards. 1% is absorbed by plants, 10% is passed on through C-levels.
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