On the other hand, B is about the skin color of the residents of the area by their sensitivity for the wavelength of 305mn.
The source you linked to says something different:
The coefficient of variation (CoV) for UVB (Fig. 9.1B) is strongly associated with its seasonal nature outside of the tropics
So that’s the standard deviation divided by the mean, all calculated purely from UVB levels throughout the year, not from skin color.
Even if the map were based on skin color, that still wouldn’t point to rapid evolution unless they excluded Australians of European descent. Otherwise, if you tell me that lighter-skinned people living in Australia tend to live farther from the equator, well… sure, that’s where I’d expect the British to settle.
I take D3 as well, though I didn’t know about the link between the timing of it and sleep, so thanks for that. I’ll switch to taking it in the morning.
The argument is not about rapid evolution in the few hundred years since Europeans arrived in Australia but about rapid evolution in the thousands/ten’s of thousand years.
Populations that become native Australians had to first leave Africa, then pass through Iran with his farther from the equator and then travel through the Philippines to arrive in Australia.
I think native South American case is more interesting then Australia given that it’s population had to migrate through the Bering street in the Lithic stage which required them to be far from the equator.
I had thought you were arguing for strong selection pressure based on variation in pigmentation among aboriginal Australians compared to their latitude within Australia. The map doesn’t support that (in Australia or South America), since it has nothing to do with skin color.
If instead you’re arguing for pressure based on aboriginal Australians quickly becoming darker-skinned than their southeast Asian ancestors, then that doesn’t point to the importance of vitamin D. It points to the importance of not getting skin cancer. Rapid evolution of lighter skin would point to the importance of vitamin D. I suppose if the southeast Asian ancestors of aboriginal Australians had similar pigmentation to modern aboriginal Australians (maybe due to rapid migration from Africa? I don’t know), and if those who remained in southeast Asia developer lighter skin in that time, then that argument could work. But do we know what sort of skin tone the Asian ancestors of aboriginal Australians had?
As I said I don’t think Australian’s are the best example and South American’s are better.
I do agree that the image is misleading and I will look into updating the argument. I still believe that the thesis that evolutionary pressure lead people to develop dark skin while living near the equator in America is true, but it needs more sources.
The source you linked to says something different:
So that’s the standard deviation divided by the mean, all calculated purely from UVB levels throughout the year, not from skin color.
Even if the map were based on skin color, that still wouldn’t point to rapid evolution unless they excluded Australians of European descent. Otherwise, if you tell me that lighter-skinned people living in Australia tend to live farther from the equator, well… sure, that’s where I’d expect the British to settle.
I take D3 as well, though I didn’t know about the link between the timing of it and sleep, so thanks for that. I’ll switch to taking it in the morning.
The argument is not about rapid evolution in the few hundred years since Europeans arrived in Australia but about rapid evolution in the thousands/ten’s of thousand years.
Populations that become native Australians had to first leave Africa, then pass through Iran with his farther from the equator and then travel through the Philippines to arrive in Australia.
I think native South American case is more interesting then Australia given that it’s population had to migrate through the Bering street in the Lithic stage which required them to be far from the equator.
I had thought you were arguing for strong selection pressure based on variation in pigmentation among aboriginal Australians compared to their latitude within Australia. The map doesn’t support that (in Australia or South America), since it has nothing to do with skin color.
If instead you’re arguing for pressure based on aboriginal Australians quickly becoming darker-skinned than their southeast Asian ancestors, then that doesn’t point to the importance of vitamin D. It points to the importance of not getting skin cancer. Rapid evolution of lighter skin would point to the importance of vitamin D. I suppose if the southeast Asian ancestors of aboriginal Australians had similar pigmentation to modern aboriginal Australians (maybe due to rapid migration from Africa? I don’t know), and if those who remained in southeast Asia developer lighter skin in that time, then that argument could work. But do we know what sort of skin tone the Asian ancestors of aboriginal Australians had?
As I said I don’t think Australian’s are the best example and South American’s are better.
I do agree that the image is misleading and I will look into updating the argument. I still believe that the thesis that evolutionary pressure lead people to develop dark skin while living near the equator in America is true, but it needs more sources.