3 ms·

Cannibalism seriously threatens a species' survival. Risk of disease from eating same-species meat is a good way to stop it.

maxerickson 10y ago
Small mammals often respond to stress with cannibalism. http://www.petplace.com/article/small-mammals/general/when-your-small-mammal-is-sick/cannibalism http://www.petplace.com/article/small-mammals/general/when-y... Rabbits are somewhat infamous for eating their young. I'm not sure there is any research about it, but it could be a resource preserving behavior.
zdragnar 10y ago
Hardly. Plenty of species exhibit cannibalism; see certain spiders and praying mantis (mantis?) post-mating rituals.
- cookiecaper 10y ago
  Correct, I don't mean to imply that no species are cannibalistic; as you note, some instances are well-known. Nevertheless, cannibalism can be a real risk for some species and adaptations to prevent it are useful, especially in the case of mammals.
  - sqeaky 10y ago
    A hard to detect and easy to mis-attribute wasting disease is not an adaption.
XFrequentist 10y ago
Nature cares not a whit about "species".
- cookiecaper 10y ago
  Personification of "nature" is a shorthand. No one actually thinks "nature" is an intelligent entity making independent decisions about the biology of creatures (when people refer to that, they call it "God"). Rather, they mean "Could this be the way that the species' internal biological and evolutionary processes are involved in preventing cannibalism?" Personally, I think "nature's way" is a highly preferable and convenient shorthand. :)
  - XFrequentist 10y ago
    I wasn't objecting to the teleological language (as you say, it's a convenient shorthand for an unconscious process). Rather, the idea that "species survival" is a relevant variable for selection to target is thoroughly confused (or, nature cares deeply for the gene, but knows not of your "species").
- yblu 10y ago
  All things equal. Specie A (with this disease) stop cannibalizing after seeing the outcome, better chance of survival. Specie B (without this disease) eat themselves to the last person... Lower chance of survival as a specie. Nature "cares" by generating lots of options, then let the fittest to survive. So while nature doesn't intend or plan for a specie to survive, the outcome is no different from if it did. I believe the OP means "care" in this sense.
  - idanoeman 10y ago
    Right, having-prions can be seen as adaptive for a species.
  - mcguire 10y ago
    "Specie B (without this disease) eat themselves to the last person... Lower chance of survival as a specie." That seems unlikely. A bigger risk would be a carnivorous species exterminating its prey species.

maxerickson 10y ago

Small mammals often respond to stress with cannibalism. http://www.petplace.com/article/small-mammals/general/when-your-small-mammal-is-sick/cannibalism http://www.petplace.com/article/small-mammals/general/when-y... Rabbits are somewhat infamous for eating their young. I'm not sure there is any research about it, but it could be a resource preserving behavior.

zdragnar 10y ago

Hardly. Plenty of species exhibit cannibalism; see certain spiders and praying mantis (mantis?) post-mating rituals.

cookiecaper 10y ago
Correct, I don't mean to imply that no species are cannibalistic; as you note, some instances are well-known. Nevertheless, cannibalism can be a real risk for some species and adaptations to prevent it are useful, especially in the case of mammals.
- sqeaky 10y ago
  A hard to detect and easy to mis-attribute wasting disease is not an adaption.

XFrequentist 10y ago

Nature cares not a whit about "species".

cookiecaper 10y ago
Personification of "nature" is a shorthand. No one actually thinks "nature" is an intelligent entity making independent decisions about the biology of creatures (when people refer to that, they call it "God"). Rather, they mean "Could this be the way that the species' internal biological and evolutionary processes are involved in preventing cannibalism?" Personally, I think "nature's way" is a highly preferable and convenient shorthand. :)
- XFrequentist 10y ago
  I wasn't objecting to the teleological language (as you say, it's a convenient shorthand for an unconscious process). Rather, the idea that "species survival" is a relevant variable for selection to target is thoroughly confused (or, nature cares deeply for the gene, but knows not of your "species").
yblu 10y ago
All things equal. Specie A (with this disease) stop cannibalizing after seeing the outcome, better chance of survival. Specie B (without this disease) eat themselves to the last person... Lower chance of survival as a specie. Nature "cares" by generating lots of options, then let the fittest to survive. So while nature doesn't intend or plan for a specie to survive, the outcome is no different from if it did. I believe the OP means "care" in this sense.
- idanoeman 10y ago
  Right, having-prions can be seen as adaptive for a species.
- mcguire 10y ago
  "Specie B (without this disease) eat themselves to the last person... Lower chance of survival as a specie." That seems unlikely. A bigger risk would be a carnivorous species exterminating its prey species.