Dictionary » P » Pelagic

Pelagic

Relating to or occurring or living in or frequenting the open ocean; oceanic islands like Bermuda; oceanic currents; oceanic birds; pelagic organisms; pelagic whaling.


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Re: Ancestor or Contemporary?

... Porthero and Lazarus, 1980, Planktonic microfossils and the recognistion of ancestors, Systematic Zoology 29:119-129; Lararus, 1983, Speciation in pelagic Protista and its study in the microfossil record: a review, Paleobiology 9:327-340. The horse series in North America also shows examples of ...

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by robsabba
Thu Apr 01, 2010 2:40 pm
 
Forum: Evolution
Topic: Ancestor or Contemporary?
Replies: 3
Views: 2960

Re:

... a decent level of instability. What you will find, however, is that organisms which are well-adapted to very stable parts of the environment (like pelagic sharks or horseshoe crabs) tend to have much better mutation-repair chemistry. For them, mutational variation is non-adaptive. That makes sense. ...

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by Dougalbod
Thu Oct 08, 2009 9:32 pm
 
Forum: Evolution
Topic: Ability to mutate is an adaptation
Replies: 19
Views: 9052

Ability to mutate is an adaptation

... a decent level of instability. What you will find, however, is that organisms which are well-adapted to very stable parts of the environment (like pelagic sharks or horseshoe crabs) tend to have much better mutation-repair chemistry. For them, mutational variation is non-adaptive.

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by Darby
Thu Oct 08, 2009 8:58 pm
 
Forum: Evolution
Topic: Ability to mutate is an adaptation
Replies: 19
Views: 9052

Change is constant, no living fossils?

... usually well-adapted to some microenvironment that has remained stable over long periods of time, such as horseshow crabs in surf environments, or pelagic sharks, or lots of tiny organisms. But all we know is that the physically resemble their ancestors - how much they may have changed chemically ...

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by Darby
Sat Apr 28, 2007 3:40 pm
 
Forum: Evolution
Topic: Change is constant, no living fossils?
Replies: 4
Views: 2948

Can somebody answer my question???????

When you read "most sharks," remember that it translates to "most pelagic sharks," which are the sexy ones. There are lots of benthic sharks which have pumping gills and don't need to keep moving. No idea how they sleep, though.

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by Darby
Tue Nov 14, 2006 3:09 am
 
Forum: Zoology Discussion
Topic: Can somebody answer my question???????
Replies: 9
Views: 3750
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