What is the mechanism, that calls for these thick beaked birds, to go to thicker beaked birds? If you explained this and I missed it I apologise.
I would tend to belive they would inherit the same thickness. Not a
whole pop of thicker beaks.
Some Important Things to Keep in Mind, page 3
privacy
reply posted on 16-8-2010 @ 04:17 PM by oliveoil
reply to post by randyvs
Not that I want to quote anything anyone that makes sense on this board says or any thing. I happen to simply agree with you. -QUOTE, what you said.
Not that I want to quote anything anyone that makes sense on this board says or any thing. I happen to simply agree with you. -QUOTE, what you said.
reply posted on 16-8-2010 @ 04:18 PM by TheWalkingFox
reply to post by randyvs
This was actually observed in the field in the Galapagos by Peter and Rosemary Grant.
wps.prenhall.com...
Basically, during a drought, only the large, heavy seeds of drought-resistant plants were available for forage. The smaller-billed species of finch fell into decline because they could not handle the seeds. However, the overall thickness and size of the bill of the small-billed population increased; those small-billed specimens who were more able to eat the larger seeds than their co-speciests were the ones to survive and pass on their traits.
Natural variation in the population; some individuals happeend to have larger bills than others in the same species - led to a survival advantage that favored the traits of those individuals.
[edit on 16-8-2010 by TheWalkingFox]
This was actually observed in the field in the Galapagos by Peter and Rosemary Grant.
wps.prenhall.com...
Basically, during a drought, only the large, heavy seeds of drought-resistant plants were available for forage. The smaller-billed species of finch fell into decline because they could not handle the seeds. However, the overall thickness and size of the bill of the small-billed population increased; those small-billed specimens who were more able to eat the larger seeds than their co-speciests were the ones to survive and pass on their traits.
Natural variation in the population; some individuals happeend to have larger bills than others in the same species - led to a survival advantage that favored the traits of those individuals.
[edit on 16-8-2010 by TheWalkingFox]
reply posted on 16-8-2010 @ 05:49 PM by randyvs
reply to post by TheWalkingFox
Didn't you just restate what's already been understood Darlin? I was asking what( if I read the OP right) was the mechanism that made the whole next generation have even larger beaks than the previous generation. If you look at the OP It's easy to see this is stated.
Respectfully
Natural variation in the population; some individuals happeend to have larger bills than others in the same species - led to a survival advantage that favored the traits of those individuals.
Didn't you just restate what's already been understood Darlin? I was asking what( if I read the OP right) was the mechanism that made the whole next generation have even larger beaks than the previous generation. If you look at the OP It's easy to see this is stated.
Respectfully
reply posted on 19-8-2010 @ 11:24 PM by TheWalkingFox
reply to post by randyvs
The mechanism is pretty simple; starvation. That is, the birds least able to collect and utilize available food sources perished, while those who could eat survived. A dead bird does not breed, and a starving bird will not be able to attract mates very well.
The genes for gracile bills are weeded out of the population while those for robust bills remain.
The mechanism is pretty simple; starvation. That is, the birds least able to collect and utilize available food sources perished, while those who could eat survived. A dead bird does not breed, and a starving bird will not be able to attract mates very well.
The genes for gracile bills are weeded out of the population while those for robust bills remain.
Newest topics, updated in real-time:
Newest topics getting flags, in real-time:
Trees that witnessed the rise and fall of empires throughout history
Fragile Earth: 16 hours ago, 50 flags
Fragile Earth: 16 hours ago, 50 flags
Fibonacci Numbers, Phi, and the Venus/Earth Relation
Philosophy and Metaphysics: 12 hours ago, 19 flags
Philosophy and Metaphysics: 12 hours ago, 19 flags
Newest topics getting replies, in real-time:
7-year-old's suicide shocks Detroit community
Social Issues and Civil Unrest: 6 hours ago, 59 replies
Social Issues and Civil Unrest: 6 hours ago, 59 replies
Trees that witnessed the rise and fall of empires throughout history
Fragile Earth: 16 hours ago, 49 replies
Fragile Earth: 16 hours ago, 49 replies
The Above Top Secret Web sites are a
wholly owned social content community of
The Above Network, LLC.
This content community relies on
user-generated content from our member contributors.
The opinions of our members are not those of site ownership
who maintains strict editorial agnosticism and simply provides
a collaborative venue for free expression.
ATS Server: www3.theabovenetwork.com
Header data: 0.002 seconds
Page processed in: 0.063 seconds
wholly owned social content community of
The Above Network, LLC.
This content community relies on
user-generated content from our member contributors.
The opinions of our members are not those of site ownership
who maintains strict editorial agnosticism and simply provides
a collaborative venue for free expression.
ATS Server: www3.theabovenetwork.com
Header data: 0.002 seconds
Page processed in: 0.063 seconds
