this post was submitted on 13 Feb 2025
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Evolution doesn't care what happens to you after reproduction because you've already passed on your genes at that point
Take that point and explain humans living to about 100 after breeding from 20 to 40, and kids taking ~15 years to become good enough
Human tribes doing well is good for making children successful, old women have much better skills in finding whatever plant matter they're gathering, old men are better at tracking and stalking prey. The old people teach the young.
We evolved towards longer lifespans because groups that live longer survive and continue better
I mean, yes, but if you're not a vegetable afterwards, you will have more chances to reproduce. Therefore passing on your genes more
Evolution doesn't make deliberate, strategic choices. Random mutations result in new behaviors/properties that may or may not be beneficial, and selection removes those mutations that prevent reproduction from the gene pool. Not every mutation will be beneficial, but as long as it's not harmful enough to stop reproduction, it can persist.
If there were two groups of octopuses, one with the self-destructive behavior and one without, then there would be pressure from competition. In that situation, your point would have more of an impact. But without that pressure, there's nothing to drive the selection. And the mutation won't occur just because it would be helpful for it to do so - it's random.
At least, that's how I understand it. I'm not a biologist or anything.
yes, that's the point I'm trying to reinforce. There has to be "a reason" that getting stupider after mating is a succesful trait, otherwise it wouldn't be there.
The question that was asked was: what is the reason? So far I've only seen speculation in this thread
There doesn't have to be reason for it to help, all that matters is that there isnt a sufficient enough of am evolutionary hinderance to prevent reproduction. The octopi reproduced, so their traits pass on.
Thank you, so far you're the only one addressing my question. The answer could very well be that it's a spandrel, but just like you said it would be speculation like anything else- nobody here daring to say "nobody in the scientific community has a solid theory, we don't know for sure"
As was said before: The genes are already passed onto the next generation. It doesn't matter if the parents become stupid now. There's no evolutionary advantage to become more or less stupid at this point.
It became like it is now by some random chance(s).
SkaveRat is addressing my original question: I'm asking if there is an advantageous reason for this phenomenon. You seem to suggest it's a spandrel at best, and fair enough, that could be the answer. It probably is a spandrel, I also believe that.
However spandrels usually don't reduce future chances or reproduction, and this one clearly does, so I was asking perhaps there is an advantage to this feature (not a spandrel then). Or at least an explanation for its existence from a genetic perspective, ie. the genes triggering the self destructing behavior are also the same ones responsible for a major survivability feature.
The reason behind spandrels existing can sometimes be explained other than "random", as it happens with the human chin for example - apparently someone figured out it's physically impossible for a chin not to appear if you are deforming maxillary bones to flatten into a face.
So far here nobody knows for sure about the octopus, and I gather it's because science doesn't yet have a consensus on the matter. But everyone has been quick to assure me it's just random and that there isn't anything else to it without any scientific backing.
I suspect the responses you're getting stem from the original phrasing:
The question has an implicit claim that there IS a point, which people are rightly pointing out is not necessarily the case (as you have acknowledged). It certainly is an interesting question to wonder if there could be some benefit anyway, so it would probably have helped to frame it that way.
Not saying anyone is required to meet any kind of bar in the level of discourse in a casual online forum, just an observation of cause and effect, for what it's worth.
Fair enough
It is definitely more successful than the previous strategy in one of the ancestors was (or else it wouldn't have been selected for), and mutations that reduce the dementia and allow for more reproductive cycles seen to negatively influence reproduction in either fitness or number of the offspring or chance of successful reproduction, so the trait persists.
Since this is a numbers game, even miniscule differences in reproductive success (which isn't clearly measurable in the wild) have a large impact on genetic drift.
Since the origin of the current behavior lies in the past, it might not be possible to see what evolutionary pressure induced the behavior in the first place.
that's not how it works.
It is more advantageous to have more than 1 shot at spreading your genes than having only a single one.
Yes, your genes will be spread with just reproducing once, but they will be even more spread if you have a long and productive live with even more offspring
The YT channel primer actually made a video about rougjly this topic recently
Tell that to all the animals that only have one shot. There are quite a lot of them and usually they all lay thousands of eggs.
Probably the most well known of them is the salmon. Only about 5% of them survive the procreation after the salmon run (of those salmon species that actually do the run).
yes, and that is in disagreement with my post how?
yeah but octopi are intensely successful hunters. this may be either a mechanism that helps prevent resource scarcity, or it could prevent parent/offspring mating
They also lay tens of thousands of eggs at once.