Introduction of new

organismsP6 Interactions

Information Search• You are to work individually to search for another

example of where the introduction of a new organism affected the survival of another.

• Present your findings in any way you like. (E.g. powerpoint, word, glog, song, rap, picture, etc)

• Save your work in the projects folder. Name the file as your name (e.g. Alex.ppt)

• Please remember to include your information sources.

Falcons• Since falcons arrive in New Zealand in

1230 to 1300, the number of lizards, earthworms, frogs, and insects started to decrease. They hunt by using their tiger-sharp claws. Falcons act as a predator to the species mentioned earlier. Falcons can spot their prey from afar, since they have very good eyesight.

RatsYou may think that rat’s are harmless,

but you are very wrong. In the country of New Zealand, Rat’s are a PEST. The rats

of New Zealand has done immense damage to the native New Zealand bush. These rats were stowaways on canoes or ships. These rats ate Bird Nest and even got a chance to make a Speech in front

of the Press( bottom pictures ).

This little tiny rat had played a role in the deforestation of Easter Island by eating the nuts of

the local palm tree, preventing regrowth of the forest. Polynesian rats are like most rats, and are

climbers, often hiding in trees. In winter, they strip bark for consumption and satisfy themselves with

plant stems.

Polynesian Rat

+ =

Information from wiki pediaIsaac ong

Trumpeter Swan

Original declines were the result of commercial trade in swan skins and

excessive hunting. Populations generally increasing. Several states

and provinces have programs to reintroduce Trumpeter Swans.http://www.allaboutbirds.org/guide/trumpeter_swan/lifehistory#top

baby trumpeter swan

From:

By: Jia Ying

• Possums is a threat to New Zealand

The Possums is decreasing the population of dingoes,

bush fires and less palatable vegetation as they eat them. In New Zealand there are

no predators and lots of very palatable vegetation as a result they have a huge impact on New Zealand

ecosystems.

Feral foxes in Australia The first introduction occurred in 1845 near Keilor,

Victoria. The spread of red foxes across southern Australia

coincided with declines in the distribution of several medium-sized ground-dwelling mammals, including

Brush-tailed bettongs, burrowing bettongs, rufous bettongs, Tasmanian

bettongs, bilbye, numbats, bridled nailtail wallabies and quokkas. Most of these species are now limited to islands where red foxes are absent or rare. Semi-arboreal species affected by fox predation include

brush-tailed and western ringtail possums

Green crab a crushing blowAn adult green crab (Carcinus maenas) is about 6–7 cm long but can grow larger. Green crabs can out-compete and out-manoeuvre other crabs with ease. They feed on many seashore organisms, particularly bivalve molluscs such as clams, oysters, and mussels and small crustaceans. Green crabs are quicker, more dexterous, and can open shells more easily than other crab species. Green crabs are native to Europe and were first transported to the US inside small tunnels bored by shipworms into wooden ships. Green crabs were noticed on the east coast of North America in 1817 and now occur from Nova Scotia to Virginia. The crab is believed to be responsible for the destruction in the 1950s of the soft-shelled clam fisheries which affected thousands of people. Catches fell from 14.5 million pounds in 1938 to 2.3 million pounds in 1959, a period during which the range of the green crab extended into the clam fishery area.