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9 Cards in this Set

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Crocodylus johnstoni
COMMON NAMES:
Johnston's crocodile, Australian freshwater crocodile, "FRESHIE", Fish crocodile, Johnston's river crocodile.
Swamps, lakes, and billabongs.
saline upstream areas of river systems and creeks
Not found near the coast with high salinity and more competition
Small, 2.5-3m in wild (male)
female- 2.0m
eats-small vertebrates and inverts. larger can eat terrestrial spp
Sit and wait hunters
Crocodylus porosus
Estuarine croc, saltie
In N australia and SE Asia. can travel long distances
High tolerance for salinity
Found in brakish water around costal areas and in rivers.
Juviniles- freshwater
forced out of these areas into more salty waters.
Males can reach 6m (over 5m rare)
Eat- juviniles insects ampbians other small stuff
adults vertebrates (turtles goannas etc) can eat larger prey
BREEDING-
lay 40-60 eggs in mound nests made of vegetation. made in nov-march during wet season
Insulate eggs from temp extreams, hides from predators, stops dehydration, minimise flooding.
Flooding-main cause of embryo death.
dig babies out when she hears them chirping-carries them in her mouth
Temp dependent sex
1% live to maturity
Crocodile interest
Iconic especially in the N territory
Pests- eat people
Resource- meat, hide, tourism and trophy hunting
Public wants to destroy, cosset or exploit crocs
Government- crocs are protected but commercial use is issued when certain criteria is met. ie) "problem" crocodiles
Historty of exploitation and populations
1: uncontrolled harvest, overexploitation
2: Protection Appendix I (threatened with extinction)
3: Population surveys, recovery underway. downlisted to appendix II
controlled commercial harvesting
Meat/Hides
Meat- white and bland (depends on what they have been eating and sauce)
Hides- leather. belts, handbags, wriswatches, shoes. High Fashion. Very Expensive.
How it is made:
1. Crocodile Farms
Wild (ranching)- Get them from the wild b/c they are 'problem animals' or juviniles or eggs
Captive breeding- closed cycle farming
2. Direct harvest
shooting and harpooning
Tourism
Wildlife safaris/ecotourism
Zoos
Trophy Hunting (proposed but rejected)
Stages of Human Appreciation of "Wildlife"
1. Direct Harvest
2. Domestication and agriculture (major paradigum shift)
3. Wildlife 'sacred'
not civilized to eat wildlife
creation of game reserves, for hunting, enhanced the 'sacred' status
4. sustainable use of wildlife
use it or lose it
alignment of ecological and economic goals.
Major paradigm shift
Recognizes need for conservation of habitat.
Consequence of human ppln pressure
More and more land alienated from wildlife
Human interests and those of wildlife are often in conflict.
Principles of SUW
Harvesting can be done humanely
Populations can sustain a harcest at economically viable levels
Biodiversity conservation is not compromised
Conservation gain is encouraged wherever possible