• 31 Posts
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Cake day: June 14th, 2023

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  • LibertyLizard@slrpnk.nettoScience Memes@mander.xyzdendrochronology
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    2 days ago

    They usually use a coring device. In theory it should survive just fine although I don’t know that long term effects are well-studied.

    But I mean this is one reason some big old trees have such bogus ages reported. Either they’re too big to reasonably core or they don’t want to risk any damage. Or sometimes the middle of the tree is too rotten to count the rings. It’s OK to say we don’t know the age rather than making something up.


  • LibertyLizard@slrpnk.nettoScience Memes@mander.xyzdendrochronology
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    2 days ago

    It’s the main accurate way, at least for living trees. By the way, I’m including cross-dating here since even though it’s slightly different from ring counting, it uses the same basic idea just extended to a wider group of trees.

    There are other methods but none really have a proven track record of accuracy the way tree-ring based methods do.

    For well documented trees that coexisted with literate cultures, historical records can be used, though these records can sometimes be wrong. Some trees have ages from oral tradition too but these are difficult to verify.

    Overall, I view non-ring-based methods with skepticism and some are outright preposterous, especially the common claims you see online which have no methodology listed. But even some published estimates using alternative techniques seem dubious. Perhaps they will be replicated and proven in the future but the evidence is tenuous today.




  • Calochortus has been a bit tricky, the others were quite easy. I just collected some seed from nearby empty open spaces and put them in pots and they grew. You have to know where to find them though–they’re mostly in the hills now because those were never plowed, but there are small areas here and there that weren’t laser-leveled with the rest of the valley. iNaturalist can be helpful for these.

    They seem to do better if you extend the growing season with irrigation in fall and spring but even without they do fine. So far they don’t survive when I put them in the ground though, not sure why. Pest issue maybe.

    Interesting that miner’s lettuce is rare where you are. It’s a weed that grows in the sidewalk here. I guess it does like a lot of moisture, and it gets a lot drier further south. We get about 18 inches of rain here which is plenty in winter, and since it dies back in spring it doesn’t mind the summer.

    Phacelia is another one I’ve been wanting to try. There’s one at a local park that is always teeming with bees.



  • This sounds very cool! I am also in the valley, up in Sacramento. It’s somewhat of a tough climate for the ornamental native gardener since a lot of stuff turns brown in summer which can piss off the neighbors. Love me some Triteleias though, that might be my favorite native species–since you’re a forager you may know the bulbs are edible. I’m also growing Brodiaea, Sanicula bipinnata (which I call wild cilantro, it’s edible and tastes similar), milkweed, miner’s lettuce, and calochortus. Phyla nodiflora is another great one for a lawn alternative if you want that.









  • LibertyLizard@slrpnk.nettoScience Memes@mander.xyzMeow
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    20 days ago

    Thanks, this seems more in line with what I was wondering. But I’ll need to see if I can get access to the full paper. The example given in Australia actually fits my hypothesis since they historically lacked felid predators. So I’d like to see the full list to see the location and severity of the effects they’re reporting.



  • LibertyLizard@slrpnk.nettoScience Memes@mander.xyzMeow
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    20 days ago

    Again it would depend on where those are—threatened species are disproportionately located on those islands I mentioned. Furthermore it doesn’t assign any causation to cat predation.

    Maybe cats are a serious conservation threat on continental areas but I’m just saying I haven’t seen evidence of this.