by bananaman » Thu Apr 11, 2019 8:43 am
by nimbulan » Thu Apr 11, 2019 5:13 pm
by TheTrapper » Thu Apr 11, 2019 5:56 pm
by bananaman » Thu Apr 11, 2019 7:45 pm
nimbulan wrote:The greatest biodiversity will always be found in the harshest environments, since the increased survival pressure drives adaptation and speciation. South Africa and Australia are known to be hotspots of biodiversity because of this, though Australia is a much larger landmass and hence has a far greater number of species.
Tropical regions such as equatorial South America and southeast Asia are also rather harsh environments - the same nutrient poor soil as desert environments, but wet rather than dry. This results in a wide variety of species in both regions, but neither of them can hold a candle to Australia.
by Nepenthes0260 » Thu Apr 11, 2019 9:04 pm
by nimbulan » Thu Apr 11, 2019 10:52 pm
bananaman wrote:What really interests me is that when you’re looking at carnivores, Brazil has representatives of more carnivorous lineages than Australia, but has fewer species. Isolation of the environment from its surroundings does seem to be a big deal — most of the diversity in Brazilian carnivores is in the highlands, which are obviously isolated: Drosera, Heliamphora, Genlisea, Utricularia, and Brocchinia are mostly in the mountains in the north, iirc. Philcoxia is in the central part of the country and Catopsis is everywhere.
I know many biodiversity hotspots seem to have elevation as an isolating factor, but Australia doesn’t seem to have nearly the same relief as other hotspots. Is the biggest isolating factor keeping species apart in Australia simply the harshness of the summer drying?
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