Global amphibian declines Flashcards
how many species of amphibians
5,700
since 1980 how many amphibian species have experienced rapid decline
1/3rd
nearly 2,000 species
–> that have gone completely extinct
–>gone extinct in the wild but have captive breeding programs at zoos
–> have potentially gone extinct
massive extinctions being called
the most spectacular loss of vertebrate biodiversity in recorded history
name a disease which is causing an amphibian scourge
Batrachochytrium dendrobatidis
Bd is a
chytrid fungus
- aquatic and motile
- causes severe disease in amphibians
over the past 30 years
lots of research has poured into research regarding the amphibian scourge
in 1997 some of that research paid off
with the very important discovery of the chytrid fungus, Bd
Chytrid fungi are
heterotrophs
heterotrophs
sequester carbon from other life sources, not the sun–> saphorhphytes and parasites
Bd life cycle
1) bd starts as a tiny zoospore that swims in open water
2) when it find suitable host, it burrow deep into the skin and develops into a thallus
3) thallus matures into a sporangium- egg-sac
4) the sporangium grow until they burst open and new zoospores are released
5) these zoospores swim around and find new hosts, or re-infect the same host and cause chronic disease
Bd life cycle take
4-5 days
Bd causes a chronic skin disease called
chytridiomycosis- colonised keratinised skin layer
hyperplasia and hyperkeratosis causes
disrupted electorylye balance
chyridiomycosis leads to
cardiac arrest and death due to disrupted electolye dance
amphibian ski is
tremendously improtnant