Survival of the Fittest?

So, if species grow and succeed on the basis of survival of the fittest, meaning they are doing something that is good for the ecosystem — then how come the ecosystem pitches them out later and they go extinct?

I think the answer to this is that species succeed on the basis of something they are doing that is “fitness” within the ecosystem. That is, it is useful or at least not harmful within the multiple variables of the whole system. And what the ecosystem needs to survive is “resilience” (that is, the ability to change when conditions change) and “sustainability” (that is the ability to stay in balance by adjusting it’s parts, which is almost but not quite the same as resilience). So if a species does not upset the balance — and it increases the resilience of the system — then it is a happy camper within the system.

So why would it then go extinct, I mean barring the occasional mega-volcano or meteorite? I think most species are good at something, better at something than other species. Humans, those who don’t think the problem through, tend to believe this is “fitness.” Being better. They think being better and better at some little thing, like winning, for example, is fitness, and in a way it is, because it allows the species to fill or create a new niche in the system. Up to a point where it can no longer maintain its balance, a system with more niches will be more resilient than a system with fewer niches.

Most species are therefore good at something that is different from the other species that live in the same space. As time goes by and generations follow generations, and selection pressures of the surroundings tend to continue or increase, I think most species develop whatever is their advantage until it passes a balance point and becomes extreme.

For an example, think of the giraffe. And then if conditions change or they continue to develop the same trait to absurdity, they can’t cope in the system any more. For example, if all the tall trees died as a result of global warming (or anything, tree diseases, whatever) the giraffe would have to compete with everyone else at ground level and would probably become extinct.

Humans, now, have developed their definining characteristics to an even greater absurdity than giraffes. Humans in the USA, young people that I talk to, they actually believe they can control their environment (ecosystem) with the power of their brain, either directly or through creating technologies.

The trouble with having a really good brain as a defining characteristic is that it can go crazy and do absurdly harmful things to its own environment that lead to its own extinction. This is not fitness; it will not survive.

But we do have that brain, and we could use it for something useful if we wanted to.

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