On Monday 9 May 2022 at 13:42:01 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
>>> That's why?? Science explores and tries to explain how, not why.
>>> . .
>> Where did you get that idea?
>. .
> From Science. All scientists know this.
> . .
Quote some good authority for this.
If it was true, you would have quotes
from the greats.
>>> How did it acquire these traits?
>>>. .
>> The monkey began to brachiate.
>. .
> Since other primates don't, how did it's niche change to give advantage
> to brachiating rather than the usual monkeyb locomotion?
I wasn't there (some 25 ma) so I have
to speculate. Maybe this island had a
lot of fairly horizontal lianas.
The habitat probably didn't change
much. It was more that a change in
the course of a river isolated one
monkey population, allowing it
(over many generations) to develop
a new and highly effective mode
of locomotion.
>> Of course, as it became more gibbon-
>> like, it lost some standard monkey
>> capabilities -- climbing fast vertically,
> . .
> Long arms allow them to climb rapidly vertically.
The point is that gibbons don't climb
the same way as monkeys. A quasi-
gibbon (halfway from being a monkey)
would not be good at climbing
vertically in either manner.
> > jumping from tree to tree, etc.
> . .
> Gibbons are very good jumpers.
As above only for jumping.
>> A less-isolated population would not have
>> been able to cope with the competition from
>> standard monkeys,
> . .
> Monkeys en masse displace gibbons, eg. 60 macaques vs 2
> gibbons, food is stripped, macaques move onward, gibbons are
> stuck. Gibbons live near shallow clear streams, macaques along big
> murky rivers.
Gibbons are so high up, and can get
their water from fruit, that they
probably barely know about any
streams on the ground. Much the
same would apply to many monkey
populations.
>> The first gibbon population found a new
>> niche;
>
> What was this new niche and why was brachiation advantageous?
Probably an island with a lot of fairly
horizontal lianas.
>> it radically changed its morphology
>> and -- when its isolation ended -- ceased
>> to be capable of interbreeding with its
>> monkey ancestors (or cousins). This
>> wasn't just genetic. Any gibbon-monkey
>> half-breeds were pretty useless as either
>> gibbons or monkeys.
>
> Sounds like typical creationist's talk.
>. .
What is creationist about it?
>. .
>> Those water-trusting monkeys could
>> swim across rivers, and get all the
>> benefits of water-trusting possessed
>> by all non-ape primates and by nearly
>> every other terrestrial mammal.
> . .
> So you dismiss Crocs as a factor, despite them being the number
> one predator of "aquarboreal" proboscis monkeys?
Predation would certainly get some of
them. But I'm mainly talking of the
once-in-a-lifetime (or less) swimming
journey of a near-adult monkey seeking
new territory. If successful, it might be
the ancestor of thousands. Water-
fearing primates (i.e. all apes) don't
have that option, and local populations
can go extinct more easily.