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biodiversity

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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biodiversity

Postby js_daquilanea » Mon Feb 19, 2007 12:07 pm

what really accounts for the diversity of the deep sea benthos?
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Postby AstusAleator » Tue Feb 20, 2007 11:30 pm

usually you won't get any answers or discussion on questions that sound like homework unless you postulate a few answers of your own.
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Postby js_daquilanea » Wed Feb 21, 2007 4:05 am

yes...i get it...but i dont actually know where to start that's why is posted this hoping that someone could bring it up.but anyway...il try.....pls comment on this...

i think the diversity of deep sea benthos accounts for their hard to reach environment. its dark and cold there right?that even the most advance species (man) could not fully wander who, among others is the most usual suspect in decreasing biodiversity....m i right?
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Postby KyGuy » Wed Feb 21, 2007 7:46 am

There's a lot of diversity in most environments, but particularly more stable ones. There aren't a lot of environmental changes in the deep sea, and once the bigger ones are utilized (for example, fish that have adapted eyes, allowing them to see better with little to no light), the selection pressure is increased for less obvious ones (the angler fish lures prey to it with an unusual adaptation, its light).

I don't know how clear I was here, but the relatively constant environment allows for ever more complex adaptations to utilize ever subtler resources the environment has to offer.

I agree that the fact it's difficult to reach helps; when humans change things in an environment the biodiversity does tend to go down, but I wouldn't say that it's our lack of interference that is the primary cause of the biodiversity.
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Postby js_daquilanea » Wed Feb 21, 2007 11:26 am

yes...i got your very interesting point and i agree.thanks!
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Postby Beetle » Wed Feb 28, 2007 9:59 am

In some cases disturbance from human or some narutal forces can increase diversity. If there is some dominant competitiv species that does not allow other to bloom, decreasing its abudancy by disturbance can in fact increase overall diversity since repressed species or even some new species can come.
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Postby Locus » Wed Feb 28, 2007 5:36 pm

Diversity of the deep sea is relativly pour, and steal not very affcted by the humans, one of the chracter things of this part of biosphere is lackin of phososinthesis and so almost lacking of produsents (exept from hemotrophs) - almost all of ogranisms from deep sea exist only on the "food" that fall from sea surface...
And how many species thre is - it is hardly to say - there is, of couse, many unknown species, I think that there is at the bourders of tens thausands species...
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Postby js_daquilanea » Thu Mar 08, 2007 12:55 pm

i learned that the deep sea producers adapted not torely on solar radiation for their metabolism or photosynthesis... they are called chemoautotrphs since they synthesize sulfur from volcanic steam below. maybe their adaptive capabilities on such extreme environment made them success.
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Postby AstusAleator » Fri Mar 09, 2007 2:53 am

There is much speculation that life originated around these vents, which would mean that the biota found in these areas could be some of the oldest species on earth.
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Postby CoffeaRobusta » Sat Apr 07, 2007 7:33 am

The old view of the deep-sea benthos was that it was relatively poor, but in fact bathyal diversity exceeds coastal diversity in the temperate zones. Basically there are two ways to have high species diversity....high speciation rate or low extinction rate. The bottom of the sea is pretty homogeneous so I'd rule out high speciation rate in favor of the low extinction rate hypthosesis. I read of a recent study that suggested, for terrestial fauna, the temperate zones had higher speciation rate through time coupled with high extinction rates due to climatic changes that brought ice ages and such. This suggests that the high diversity of terrestial tropics is due to low extinction rate and relatively stable environments. It may be that stable environemnts are more important for the evolution of high diversity, than unstable ones.
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