The introduction of alien species in land environments, has been one of the most serious problems faced by the program for the conservation of biodiversity and natural environments around the globe.
These species are introduced in an accidental way or deliberate and its transfer is favored by the growing trade in the products they generate.
Once installed in environments that are not theirs, the populations of these species do enormous damage to the ecosystem, threatening native plants and animals, and in many cases to human health.
After habitat destruction, introduction of exotic species is the second leading cause of biodiversity loss.
In Venezuela, these outcomes have been demonstrated with species such as the bullfrog (Rana catesbeiana) from the Eastern United States. It has now expanded its geographic distribution to the west of the country, causing serious damage to the biodiversity of the Andean region.
The bullfrog is a healthy carrier of the fungus Batrachiochytrium dendrobatidis responsible for the chytridiomycosis, which is considered at fault for declining of amphibians worldwide and it may have spread through the trade.
It has been observed the presence of the bullfrog in the Andean region of Jaji, Campo Elías Municipality, Merida State, detecting populations made up of hundreds of adults and tens of thousands of larvae in an artificial lake in the Recreation Complex “The Cínaros”.
There have been studies to begin the process of control and resolution of the Ministry of Environment that, in nineteen articles, outlines strategies to control and eradicate the amphibian, it has been facing the problem. Since then the activities continue, but still does not stop the advance of the population.
It is believed that besides being a predator of other species to “contaminated” endemic species causing them probable disappearance by the spread of the fungus Batrachiochytrium dendrobatidis .
In the center of the country, the pipe parva, an endemic frog which comes from Lake Maracaibo, in Zulia state, is ravaging the Lake of Valencia, Carabobo state.
Alejandro Alvarez, Venezuelan biologist, explains that although this frog does not represent a health hazard or economic, does raises environmental problems.
“The pipe parva is being produced so extraordinarily abundant in the Lake of Valencia and is replacing the local species, which is affecting the local diversity,” says the biologist.
Alvarez adds that affects the fauna found in this place because, in addition to the pollution and damage that occurs to the local habitat, comes a species that is superior which threatens the habitability of other species, especially local frogs.
Indicates that until now is unknown how was originated the movement and the real exact impact caused to the biodiversity of the region by the frog pipe parva. However, he believes that working in this regard to prevent further causing more damage and to reverse where possible, the damage caused.
By Gustavo Carrasquel | ANCA 24