Tasmanian Giant Freshwater Crayfish Jeopardy Template

Top-down Factors	Bottom-up Factors	Density-dependent Factors	Density-independent Factors	Miscellaneous
100 What are the natural predators of the giant freshwater crayfish? At a young age, the predators include platypus, river blackfish, and rakali	100 What is a common bottom-up factor that affects the giant freshwater crayfish? Food sources	100 What species has changed its interactions with the giant freshwater crayfish in the past several years? Humans went from overfishing crayfish and destroying their habitats to conserving both	100 What is the weather factor that heavily supports the habitats that giant freshwater crayfish live in? Over 20 inches of annual rainfall provide Tasmania with bountiful amounts of water.	100 What is the location of the giant freshwater crayfish? Northern Tasmania
200 What top-down factor does not affect a fully grown giant freshwater crayfish? Predators	200 What classification is the diet of the giant freshwater crayfish? Omnivorous	200 What is one practice that has decreased the number of the crayfish population? Overfishing	200 What is the average temperature of Northern Tasmania? The average annual temperature is between 42 and 71 degrees Fahrenheit with the temperature rarely below 36 degrees Fahrenheit and 82 degrees Fahrenheit	200 What is the size comparison between North American crayfish species and the Tazmanian giant freshwater crayfish? North American crayfish species only get to about 6 inches in length while the giant freshwater crayfish can grow up to almost 16 inches
300 What species is both harmful and helpful as a top-down factor? Humans; have both overfished and conserved the giant freshwater crayfish, along with habitat disruption	300 What environmental factor could cause severe damage to the crayfish population? Severe flooding	300 What is one practice that has increased the number of the crayfish population? Conservation efforts	300 What is the major density-independent factor that poses the most harm to the giant freshwater crayfish? Habitat destruction	300 What is the gestation period of the giant freshwater crayfish? 9 months
400 What is the major top-down factor that has put the species on the threatened species list? Humans; overfishing and habitat disruption	400 What is the ideal water temperature range for the habitat of the giant freshwater crayfish? 41-62 degrees Fahrenheit	400 What has the population looked like compared to past years? The population has severely decreased, but conservation efforts have been put in place	400 What natural disaster occurred in 2016 that resulted in up to 100 giant freshwater crayfish carcasses? Severe flooding	400 Where are giant freshwater crayfish commonly found traveling? They stay in a "home pool" for 1-10 days in between movements through streams or on land
500 Due to the top-down factors in recent years, how have the crayfish differed now from in the past? The largest freshwater crayfish recorded in the last 40 years is 6.6 pounds, while before this time period they could grow up to 13 pounds.	500 What is the lifespan of the giant freshwater crayfish? 60 years	500 With females not reaching breeding age until 14 years of age and only mating biannually, how does this affect the crayfish population? The numbers have been decreasing due to the slow maturity period for females.	500 What is a threat that is only present in humans? Overfishing	500 What is the difference in habitats between adults and juveniles? Adults stay in stagnant pools with decaying logs and overhanging banks while juveniles stay in faster moving water with crevasses to hide in

Tasmanian Giant Freshwater Crayfish

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