On Thursday, November 25, 2021 at 5:20:21 PM UTC-7, John Harshman wrote:
> On 11/25/21 1:21 PM, Glenn wrote:
> > On Thursday, November 25, 2021 at 2:05:20 PM UTC-7, John Harshman wrote:
> >> On 11/25/21 12:02 PM, GlennS wrote:
> >>> On Thursday, November 25, 2021 at 12:55:20 PM UTC-7, John Harshman wrote:
> >>>> On 11/25/21 11:42 AM, GlennS wrote:
> >>>>> On Thursday, November 25, 2021 at 12:25:21 PM UTC-7, John Harshman wrote:
> >>>>>> On 11/25/21 11:14 AM, GlennS wrote:
> >>>>>>> On Thursday, November 25, 2021 at 12:05:20 PM UTC-7, Ernest Major wrote:
> >>>>>>>> On 25/11/2021 18:20, John Harshman wrote:
> >>>>>>>>>>>> A lot of their relatives are in Asia, but the lineage leading to
> >>>>>>>>>>>> Turkeys apparently moved down into Africa, and then across to South
> >>>>>>>>>>>> America.
> >>>>>>>>>>>
> >>>>>>>>>>> I'm not seeing the evidence for that. Where did you get it? The
> >>>>>>>>>>> execrable science "journalism" article you cite is talking about the
> >>>>>>>>>>> Cretaceous ancestors of all galliforms and, as far as I can see, says
> >>>>>>>>>>> nothing about turkeys moving from Africa to South America. One must
> >>>>>>>>>>> always be cautious about using current distribution to infer past
> >>>>>>>>>>> distribution, but turkeys don't live in South America, where the only
> >>>>>>>>>>> galliforms are cracids and odontophorids, both of them as far from
> >>>>>>>>>>> turkeys as from the rest of the phasianids. Turkeys presumably
> >>>>>>>>>>> originated in Central America, and if we believe phylogeny tells us
> >>>>>>>>>>> anything about it, their ancestors would have come from the north.
> >>>>>>>>>>
> >>>>>>>>>> It was some researcher that estimated the divergence of turkeys from
> >>>>>>>>>> other gallinaceous fowl of around 40 million years ago. They
> >>>>>>>>>> speculated that they came over when monkeys came over (same separation
> >>>>>>>>>> estimate). It may have been a talk that I heard instead of a paper.
> >>>>>>>>>
> >>>>>>>>> Not sure what that person was talking about or what was meant by "other
> >>>>>>>>> gallinaceous fowl". But the relevant "other galinaceous fowl" would be
> >>>>>>>>> the sister group, which would be grouse. Grouse are not African but
> >>>>>>>>> Holarctic, as Ernest mentioned. Contrast that with the sister groups of
> >>>>>>>>> NW monkeys and hystricomorphs, which are indeed African.
> >>>>>>>>>
> >>>>>>>>> I'm also dubious that the separation between turkeys and grouse could be
> >>>>>>>>> as much as 40 million years ago.
> >>>>>>>>>
> >>>>>>>>>>>> Harshman likely has a better perspective. Turkeys were placed in
> >>>>>>>>>>>> various phylogenetic relationships over the years. I don't know
> >>>>>>>>>>>> what the most recent placement is with the whole genome sequences.
> >>>>>>>>>>>
> >>>>>>>>>>> You don't really need whole genome sequences. The Wikipedia tree
> >>>>>>>>>>> looks accurate to me.
> >>>>>>>>>>>
> >>>>>>>>>>>> Looking at their South American relatives they likely looked more
> >>>>>>>>>>>> like guinea fowl when they came from Africa, but had some type of
> >>>>>>>>>>>> tail useful for display.
> >>>>>>>>>>>
> >>>>>>>>>>> Turkeys have no South American relatives except those shared with all
> >>>>>>>>>>> other phasianids. There are no South American phasianids. And I know
> >>>>>>>>>>> nothing about the South American fossil record of galliforms, if
> >>>>>>>>>>> there is one.
> >>>>>>>>>>
> >>>>>>>>>> I didn't know about no South American relatives. Another talk that I
> >>>>>>>>>> saw more recently looked at the genetics of North American subspecies
> >>>>>>>>>> and there wasn't much genetic variation found in the US populations
> >>>>>>>>>> compared to what was in Mexico. She thought that only a small bit of
> >>>>>>>>>> the population invaded territory as it opened up after the last
> >>>>>>>>>> glacial period. She mentioned an older notion that Turkeys may have
> >>>>>>>>>> been introduced into the US as a domestic bird. She didn't endorse
> >>>>>>>>>> the idea she just noted the narrow genetic base.
> >>>>>>>>>
> >>>>>>>>> Looks as if the few known South American fossil galliforms are all
> >>>>>>>>> cracids, the family of guans, curassows, and chachalacas. This is not
> >>>>>>>>> conducive to the theory of turkeys from Africa by way of South America.
> >>>>>>>>>
> >>>>>>>> Older opinion had turkeys in a separate family Meleagrididae (sometimes
> >>>>>>>> Meleagridae), rather than deeply nested within Phaisanidae. That implies
> >>>>>>>> a different opinion as to their sister group. That opinion being
> >>>>>>>> Numididae would fit with Ron's recollections.
> >>>>>>>>
> >>>>>>>> Wikipedia tells me that Odontophoridae has two subfamilies - one African
> >>>>>>>> and one New World, so that would be a candidate for an example of
> >>>>>>>> trans-Atlantic dispersal.
> >>>>>>>>
> >>>>>>> There are no examples of trans-Atlantic dispersals.
> >>>>>>>
> >>>>>> Cattle egrets.
> >>>>>
> >>>>> Everyone knows of course that quail, pheasants and turkeys can fly thousands of miles, but even if you wish to claim ancestors could, where is the example? You have inference, just like with monkeys. Are inferences examples, science boy?
> >>>> They are if they're strong enough, anti-science boy. But I mentioned
> >>>> cattle egrets because they're a recent example.
> >>>
> >>> I consider "trans-Atlantic dispersal" to be by sea. And I've said before on the subject that I have no problem with birds migrating for long distances.
> >> Well, if you're going to use a private definition of a term, you
> >> shouldn't be surprised when you're misunderstood.
> >
> > "Oceanic dispersal is a type of biological dispersal that occurs when terrestrial organisms transfer from one land mass to another by way of a sea crossing. Island hopping is the crossing of an ocean by a series of shorter journeys between islands, as opposed to a single journey directly to the destination."
> >
> >
https://en.wikipedia.org/wiki/Oceanic_dispersal
> >
> > Care for some pi?
> You assume that trans-Atlantic dispersal is a case of oceanic dispersal.
> We can agree that the Atlantic is an ocean, but that's as far as it goes.
Of course that is always as far as it goes between us. I just provided you with a definition of trans-Atlantic dispersal, which implicitly includes trans-Atlantic dispersal. That simply means "across the Atlantic ocean, not via the Arctic Ocean and northern land masses.
Your claim is that turkeys ancestors came to the Americas via some northern route, not across the Atlantic island hopping. Again I'll ask you for evidence. You know, that sciency stuff?
> >>> But simply claiming "they're a recent example" doesn't evidence anything. I'll ask you again, since you regard yourself as pro-science boy.
> >>>
> >>> Are inferences examples?
> >> Asked and answered. But I will elaborate. Since everything we know in
> >> science is by inference, yes, inferences are examples. We infer that
> >> cattle egrets crossed the Atlantic because at one time they were only on
> >> the east side and at a later time they were also on the west side. And
> >> this is in fact an example of trans-Atlantic dispersal, one that can be
> >> pinned down to an interval of a few years before 1930.
> >>
So wild conjecture chocked up as inference, eh. That all you got?
> >> I'd say that the ducks you snipped are examples too, there being no
> >> reasonable alternative to the inference of trans-Atlantic dispersal.
> >
> > I wasn't aware of snipping any ducks, but your idea of what is "reasonable" is questionable, as are most such stories.
> > But I consider "example" in such context as above, to be "evidence", which is "fact".
> > You've made this "everything is inference" argument before. It's absurd.
> > There are monkeys in Africa. That is a fact, and examples can be documented. There are monkeys in South America. That is a fact, and can be documented. Whether and how certain monkeys got to be where they are can be documented, and factual. Stories about how they got where they are without those documented facts, are just that, stories, not "examples".
> You appear not to recall a number of things you do. Let me restore the
> text: "One might also mention various species found in both Africa and
> South America. What other possible explanation is there than
> trans-Atlantic dispersal for the distribution of comb ducks
> (Sarkidiornis melanotos) or white-faced whistling ducks (Dendrocygna
> viduata) or fulvous whistling ducks (Dendrocygna bicolor)?"
> It's also a fact that South American monkeys are related by descent to
> African monkeys. And it's a fact that monkeys are known from Africa long
> before they're known from South America. The unavoidable inference is
> that somehow monkeys (and hytricomorph rodents, at the same time) got to
> South America from Africa. Can we agree on any of that?
>
> Is there a credible hypothesis of how cattle egrets came to be
> distributed as they are today that doesn't involve them crossing the
> Atlantic? Ditto for the ducks you snipped and I restored.
I don't snip ducks, but I've told you before that I have no problem with birds that can fly thousands of miles crossing vast ocean distances. No mystery with cattle egrets. The mystery, if it can be said to be, is why you offer cattle egrets and ducks as evidence of migration, nor are cattle egrets turkeys.