|[Note Guidelines] Photographer's Note|
|Back from bicycling:|
I found this toad in a mountain oasis, Tamerza, Southern Tunisia. The oued that feeds the oasis with water had recently inundated large swatches of terrain, leaving pools of water. The reproduction of the toad takes place in these ephemeral habitats. The depicted species Bufotes (Pseudepidalea) boulengeri (Lataste, 1879), the African Green Toad (Afrikanische Wechselkröte) is one of the six amphibian species reported for Tunisia. It belongs to the Bufotes viridis group of Eurasian toad species
The group has an interesting chromosomal makeup: the species are either diploid, triploid or tetraploid while retaining bisexuality. Tetraploids have a double chromosomal set, each allele is represented four times. If one fails to function after mutation, there are three "good" alleles left. The toads have bigger nuclei, bigger cells and may take a little longer to develop. We can only speculate on the significance of all this: under harsh desertic conditions it might be important that every single tadpole be genetically fit and able to survive into adulthood. Losses would later occur on land through "crimes and bad luck", not through "bad genes". The toads travel when the flat steppe or the salt lakes are under water but the survival rate will be low.
Tetraploidy brings up an interesting parallel in technology, the hybrid cars. If one engine of a hybrid car fails, (e.g. through lack of electric current) there is a second one (on gasoline) that takes over. In this case the higher price for a car with two engines is paid in money, not in developmental time.
Lit.: Márquez-Rodríguez, 2014,Herpetological Bulletin (March edition). Bufotes boulengeri (African Green Toad): New reproductive population in Tunisia (available on Internet).
M. Schmid et al. 2015. Cytogenetic and Genome Research 145: 315-330. Polyploidy in Amphibia (available on Internet)
Only registered TrekNature members may rate photo notes.
|You must be logged in to start a discussion.|
nice composition of this Bufo with good details
thanks gr lou
- [2016-07-26 7:48]
Hi Dietrich,not the best perspective talking about the light,the left part is in the shadow...but the sharpness is still good and i like the 3D effect,interesting post about this tunisian bufo...have a nice evening and thanks,Luciano