4.2.6 & 4.2.7

Extinct, Critically Endangered, & Back from the Drink

Extinct Species - Cave Lion

Scientific name: Panthera speleae atrox

The 2 major threats to the species were: 1) Natural climate change, and 2) Overkill by humans, as the cave lion went extinct during the Quaternary extinction event.

Their ecological niche was a top carnivore: The hunted other deer, mammoth, and bison, as they were very large. However, it is thought that humans used them for religious rituals, and were hunted commonly by humans. When the species disappeared, a major large mammal was gone from the ecosystem.

Endangered Species - Java Rhino

Scientific name: Rhinoceros sondaicus

Currently, threats to the species are poachers, who hunt them for their horns. The java rhino has horns that can are commonly used for fever relief in Asia, and other medicines. So, poachers are currently the main and primarily threat to the species. Their ecological role is primarily a browser, who eats twigs and branches. Their only known habitat exists in Ujung Kulon National Park. If the species were to disappear, the National Park would lose a primary attraction and the species would never recover.

The animals:

Back from The Brink: Improved by Conservation - Aleutian Canada Goose

Scientific name: Branta canadensis leucopareia

Threats to the species included habitat destruction and the fact that arctic foxes were introduced into their Alaskan habitat where they nested. Their ecological niche is their habitat on treeless islands in areas densely forested by grasses. They roost frequently on steep, grassy hillsides. They are herbivores that eat roots, sprouts, and leaves.

IF the species were to go extinct, there would not be a gigantic role on the ecosystem, due to the fact that these geese do not exist in very many places. However, the success story of the Aleutian Canadaian Goose comes from efforts of controlling the population of the foxes that threatened them, and their habitat was protected so that it could no longer be a threat to their possible extinction.

Threatened by Human Actions - Australias Great Barrier Reef

The Great Barrier Reef is located in Australia, and is one of the richest, most bio-diverse areas on the planet. It harbors more than 100 species of coral, and a plethora of species of fish, sharks, and sea turtles. Natural threats to the ecosystem include large waves that have potential to ruin the area, and hurricanes and other weather-related causes. Human threats include over-fishing and pollution thrown into the water. This causes the bio-diversity to decrease, and the coral to have trouble surviving in the unhealthy water. For ecological restoration, efforts are simple: humans ought to stop polluting the water and overfishing; they should leave alone the ecosystem and allow it to recover for now.