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9 Cards in this Set
- Front
- Back
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Crocodylus johnstoni
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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 |
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Crocodylus porosus
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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 |
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Crocodile interest
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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 |
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Historty of exploitation and populations
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1: uncontrolled harvest, overexploitation
2: Protection Appendix I (threatened with extinction) 3: Population surveys, recovery underway. downlisted to appendix II controlled commercial harvesting |
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Meat/Hides
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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 |
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Tourism
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Wildlife safaris/ecotourism
Zoos Trophy Hunting (proposed but rejected) |
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Stages of Human Appreciation of "Wildlife"
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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. |
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Major paradigm shift
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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. |
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Principles of SUW
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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 |
