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Sex cells, on the other hand, have only half the number of chromosomes of body cells and exhibit enormous variation - no two sex cells are ever the same in spite of human females producing thousands and males about 1,000 per second. Internal fertilisation in aquatic organisms help reduce the number of sex cells that have to be produced. Terrestrial organisms have no choice - external fertilisation is not possible because sex cells dry out easily.
A few aquatic organisms (some flowering plants, dugongs, whales, dolphins) have evolved from terrestrial organisms and have preserved internal fertilisation. The ability of the frog to burrow, to emerge only after heavy rain, to release eggs and sperm in close proximity and to undergo rapid development before the water dries up increase the chances of survival over other species of amphibian (even the invasive Cane Toad) and allow them to thrive where few other vertebrates can.


It has benefitted from European settlement because of land clearlng and especially provision of water for stock.
Its unique reproductive biology is important for its success because it allows for rapid repopulation of an area very rapidly after rain and the appearance of new plant growth. The main advantage of asexual reproduction is that it is fast and efficient - large numbers of offspring can be produced in a relatively short time. Anigozanthus spp (Kangaroo paw) forms a rhizome (similar to a stolon except that it is a horizontal stem with shoots and roots at points along its length - the edible part of ginger is a rhizome). Many species of Australian native plants propagate from rhizomes, including grasses, sedges and orchids.


At left is a photo of a clump of Dendrobium sp (tree orchids) growing near the lower Chandler River near Kunderang. Azolla spp, the water fern also reproduce by vegetative means and commonly compete with Lemna.
Reproduction by stolons and lignotubers in Australian native plants has been discussed in 3.6 (above).



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