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this post was submitted on 07 Feb 2024
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Asklemmy
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Yeah. Countless examples going both directions. I wouldn't call crocodilians super adaptable, but they are so well tuned for their specific environs that they've been largely unchanged for 94 MILLION years.
I would argue that being warm blooded makes an animal more adaptable. Interestingly, it seems cold blooded reptiles evolved into warm blooded archosaurs which eventually led to cold blooded crocodilians. Tellingly, these active warm blooded ancestors are all extinct in favor of the passive, cold blooded, low adaptability ambush predator.
In the opposite direction, the adaptable rat has done much better than the countless specialized species that have disappeared since the industrial revolution and human explosion.
The thing about coastal areas is they’ll always be a part of Earth’s biosphere. Unlike plains or deserts or deciduous forests, which don’t have to exist, and can completely disappear, coastlines and estuaries can only move, never disappear.
This is a cool point. I've never thought about that before. It's a very stable environment allowing for efficiency to be selected for in ways that may decrease adaptability.
A coastline absolutely can vanish(submerged) or be against geography, such as rocky cliffs, that is unsuitable. "Coastlines can't stop existing, only move" is semantic nonesense.
EDIT: for ya downvoters, where's the coastline on an island that vanishes due to rising sea levels? The Marshall Islands have a max elevation of ~7' and are already having issues with rising sea levels. When the sea rises above them, where does their coastal ecosystem go?
If a coastline submerges a new coastline is created further inland. ie, it moved. Or are you proposing a situation where all land is submerged?
You’re right, a beach can be replaced by cliffs that a crocodile wouldn’t be able to make use of. That’s a good point.
Cold blood probably makes a lot of sense for an aquatic ambush predator that needs to lie motionless for most of its life. Keeping that body warm the whole time wastes a lot of energy, especially under water. If you conserve energy, you can go longer without food which is important if you are waiting for food to come to you rather than seeking it out.