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Flashcards in Invasive Species Deck (49)
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31

Give an example of an invader that has impacted the rabbit invader

Mixamatosis

32

What is mixamotosis?

It’s a virus spread through insect transmission

33

What impact can Himalayan balsam have on river banks?

It can outcompete native plant communities by competing for space, light and nutrients and during winter can result in the erosion of river banks

34

Give an example of an invasive duck in the UK

The Ruddy Duck!

35

When was the ruddy duck introduced?

1948

36

How many breeding pairs of Ruddy Duck were introduced? And in what year?

Three breeding pairs in 1948

37

What was the population of Ruddy Duck by 1992?

3500

38

What percentage did the ruddy ducks population increase each year?

15%

39

What happened as the Ruddy Duck spread through Europe and Iceland?

It hybridized

40

What is the name of the duck species that the Ruddy Duck interbred with in Europe?

The endangered white headed duck

41

Give an example of an invasive pathogen

Ash dieback

42

What factor can increase invasive species and why?

Climate change can increase invasive species spread by creating suitable conditions for invasive species to colonise

43

Give an example of the impact an invasive species can have on native plant communities and pollination

Himalayan Balsam can disrupt native plant-pollinator relationships resulting in a reduction in genetic diversity (Truscott et al., 2008)

44

How can some species be introduced accidently?

Some species can be introduced accidently by transport (I.e. seeds stuck on car tyres).

45

Give an example on the extent of a species introduction from one plant

Japanese knotweed established itself from one individual plant and spreads through rhizomes. It outcompetes and destructs habitats

46

How can some species of invasive plants facilitate their survival?

Dispersal methods and mutualistic bonds with pollinators

47

Give an example of how invasive plants can have a positive effect on pollinators?

It can provide a nectar source, and increase their geographical range

48

Explain how Himalayan Balsam can be hardy in terms of its seeds?

Its seeds can last up to 18 months allowing it to easily recolonize

49

Why else may Himalayan Balsam be popular with native pollinators?

It’s brightly coloured and attractive petals (purple and blue).