everyone’s lost track of the stars in the sky

and the post begins

because otherwise it gets kind of visually confusing to parse, which is annoying to some folks, including me

GRANTED not everybody uses the same theme or even the same update. you might have noticed my version of tumblr is earlier than yours (I don't like the new button setup)

but still, it's just about being polite

niche partioning is a concept from ecology wherein groups within a species expand into different ecological niches so they're not competing with one another, right? so for example, sexual niche partitioning happens when sexual dimorphism means that one sex eats different things / occupies different spaces / etc. as another within the same species. you have one species that occupies multiple niches within the ecosystem.

ontogenetic niche partitioning is when this happens as a result of developmental changes. paternal care tends to obliterate this partitioning--hard to have your juveniles eating something different from your adults if the adults are feeding them!--so we just don't see it very often in mammals or birds, but it's quite common in other species, especially invertebrates. for example, a caterpillar and a butterfly are examples of classic niche partitioning, even though every butterfly will occupy both niches over the course of its life. you don't have to have a big fancy chrysalis transformation to engage in ontogenetic niche partitioning, but those transformations are a pretty big sign that it's happening in a given species.

anyway, it's most common in vertebrates among fish, lizards and snakes these days, especially monitor lizards, where juveniles will occupy a different (often arboreal or otherwise sheltered) niche from adults and hunt different prey until they get big enough that the juvenile niche. there are some good reasons to think that some dinosaurs might have engaged in ontogenetic niche partitioning, especially the bigger species, too. we think sea turtles might do it, although that's hard to say because we don't know very much about sea turtle development once the hatchlings go back to the sea.

the neat thing about ontogenetic niche partitioning is that it allows a given ecology to host a much larger population size for a given species than would otherwise be the case, because the total space occupied by that species is spread across a lot wider niche space. this is especially relevant for, say, a large carnivore that eats livestock.

basically, what if dragons are just the very oldest, reproductively mature members of their species, and the common wall lizard or whatever is just a juvenile that might or might not survive long enough to reproduce? imagine if dragon eggs are very small with big clutches of little insectivorous hatchlings that are eaten by anything that comes by, any of which might have the potential to become a great fire-breathing monster if it lives long enough.

imagine that dragon society. do people know that the hatchlings and the dragons are the same species? (they might not: there are real examples of people mistaking ontogenetically niche separated groups for independent species in their own right.) if dragons are sapient but the sapience takes time to develop, what does that say about the nature of sapience itself? how does a society work and transfer wealth if you remove parental care?