Some species, not currently divided in any subspecific taxa, have a very disjunct distribution with thousands miles separating the known present areas where they occur. Two examples are Mesembryanthemum nodiflorum and M. crystallinum, both occurring EDIT: AS NATIVE in the Mediterranean basin, the A…

Xanthosia atkinsoniana in Australia. Two completely disjunct populations on opposite sides of the continent, thousands of kilometres apart. Evidence of a historically contiguous population or actually two cryptic species? No idea [image]

Rhipsalis baccifera – range is Madagascar, Seychelles, Mauritius, Reunion, Sri Lanka. All other Rhipsalis spp. – range is South America and into Costa Rica. All other Cactaceae – range is in the Americas. Rhipsalis baccifera is the only cactus native outside the Americas, and is endemic to island…

Bromeliaceae… 3700 species known, all native in the Americas… Except for one, Pitcairnia feliciana, which is native to western Africa… Some very old relict I guess from when those two land masses were still one?

Any possibility of anthropogenic movement? Any known use by first peoples?

[image] thebeachcomber: Xanthosia atkinsoniana none that I know of. Just an inconspicuous little herb

Tame example: bigtooth maple http://dendro.cnre.vt.edu/dendrology/images/Acer%20grandidentatum/map.jpg Start in central Texas (“Lost Maples”), jump to Guadalupe Mountains (about 400 miles in the car), north to Manzano Mountains near Albuquerque (another 300 miles by car), jump again to SE Utah or S…

[image] thebeachcomber: Evidence of a historically contiguous population or actually two cryptic species? Maybe both (or like @bobmcd suggested, a recent dispersal). In one sense they are already cryptic species, since unless and until there is gene flow between the two areas, they are alrea…

I’ve driven the Nullarbor, those are two distinct/disjunct ranges but they didn’t have the biosecurity in the old days. We ate “border stew” a few times when crossing the various state borders…num…

[image] jasonhernandez74: Rhipsalis baccifera – range is Madagascar, Seychelles, Mauritius, Reunion, Sri Lanka. and America. Distribution map on POWO.

Organisms with a very disjunct distribution: issues?

Nature Talk

DianaStuder January 25, 2023, 6:44pm 3

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Organisms with a very disjunct distribution: issues?

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