loving the age/de-aging thread, thanks for taking the time to educate! why would lobsters ever molt too big if it kills them? is it just bc they don't know? so sentient lobsters aware of mortality would live forever?
So basically, this is a case where a gene(s) that gives you a reproductive advantage (just! keep! growing! GET AS BIG AS POSSIBLE!) also has a longterm disadvantage associated with it (you die of growing to death), but since youâve already had lots of kids and passed on those genes by that point, thereâs no way for selection pressures to fine tune that little glitch at the end.
selection doesnât care if you die eventually, as long as you pass on more of your genes than the other guy.
since the âjust keep growingâ appears to be built in, sentient lobsters probably couldnât short circuit that portion of the process.  if they donât molt, they eventually outgrow their own exoskeleton, and if they nutrient-restrict enough to stop growing they probably muck up other physiological processes.
questbedhead replied to your post âdreadlord-mr-son replied to your post âFriendly reminder that...â
so does that mean a theoretical lobsteresque alien society with good medical care and/or a lot of energy drinks COULD achieve quasi-immortality, or at least create a ruling class of studly, geriatric giants?
In my opinion they could definitely extend their lives, probably a lot, with appropriate nutrition and advanced lobster medical care. Â But theyâd eventually start hitting other hurdles--for example, at some point their exoskeletonâs not going to be able to support their own body weight. Â
Or, if they get big enough, theyâd need to drastically up the oxygen content in their environment to counter the fact that they have an open circulatory system to deliver oxygen to their tissues. Their volume to surface area ratio would be slowly skewing, making that not a very effective plan anymore. Â And oxygen is a pretty toxic chemical, so thatâs going to start having its own problems.
codedredalert replied to your post âdreadlord-mr-son replied to your post âFriendly reminder that...â
is your labmate's talk published anywhere i wanna read it
Itâs not! Â which is a shame, because heâs a really good speaker!
Iâm going to bug him to see if I can get him to put together some kind of blog post or laymanâs science version of it to put online, because even just all the background conceptual material was really, really neat.