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What effect can environmental selection pressures have on the ecosystem…
What effect can environmental selection pressures have on the ecosystem
Cane toad
population
Over 200 million
females lay up to 3000 eggs at a time
the first rains in the wet season stimulate breeding
cane toads population has drastically increased
mating can occur all year round
depending on water availability
cane toads spawn
still or slowly moving waters
What are they ?
omnivores (eat plants and animals)
prey on native flaura and fauna
They have few predators
Poisonous pests
Species of toads that were introduced to Australia in 1935 from hawaii
Purpose to decrease the cane beetle population
failed to exterminate the beetle population
rapidly reproduced and spread all over Australia
released into Queensland
Ground dwellers
-Absorb water through their skin
amphibians
scientifically know as Rhinella marina
adaptations
legs have grown
allow them to move faster
getting quicker
Abiotic factors effecting cane toads
temperature
Toads can survie in temperatures not exceeding 40 degrees
moisture
how the cane toad adapted
toads become active during the night in the warmer moths
take shelter when the weather is dry
moist hollows
rocks
logs
water supply
toads are expected to stop spreading
Perth has a lack of rain/precipitation
toads will not thrive in this habitat
Toads need a moist wet habitat to survive
tolerable temperatures
permanent water supplies
reproduction of cane toads
reproduce in wet seasons
need a permanent water supply
impact of cane toads
toxicity
shoulders glands release toxins that intoxicate biotic factors
killing animals that try prey on them
poisoned humans from making physical contact
Poison native animals thats diet consists of frogs
toxins effect on bodily functions
accelerates heart rate
causes shortness of breath
stops the heart from functioning properly
in the way it pumps blood
creamy white solution
Impact on Kakadu National park
Toads are likely to colonise every habitat type within the park
woodlands
thrive in this ecosystem
continue to threaten native wildlife
grasslands
wetlands
Biotic factors effecting cane toads
They have few predators
Preadators have adapted
increased a resistance to its poison (Bufotoxin)
Number of potential mates
human interactivity
human habitation in the national park
campsites
ranger spots
pets being poisioned from digesting cane toad
recreational activities
Number of potential mates
Competitors
compete for food with vertebrate insectivores
carnivorous plants or animals
eats insects
Diseases
many cane toads carry diseases
transmitted to native frog and fish
impact of cane toads on other species
northern quolls
population decreased since introduction of cane toads in Kakadu
Red bellied black snake
Cane toads acted as a selection pressure
Snakes adapted its characteristics
snakes heads have gotten smaller
unable to open their jaw wide enough to eat the toad
snakes have grown in length
household pets
goanna