Discussion/Quiz questions to accompany Hulme et al., 2008 1. Name and describe t

Question

Discussion/Quiz questions to accompany Hulme et al., 2008

1. Name and describe two of the six principal pathways of invasion outlined in this paper.

2. Figure 1 shows typical invasion pathways broken down by taxonomic group. Choose one example group (e.g., terrestrial vertebrates) and describe its typical introduction pathway(s). Are any other taxonomic groups most commonly introduced via this pathway?

3. Figure 2 defines pathways of invasion and gives examples of regulations that could reduce each pathway. Describe one regulation that could reduce risk from unintentional introduction and one regulation that could reduce risk from intentional introduction.

4. Are invasive species likely to continue to be introduced in the future? Why or why not? (use evidence from the paper to support your argument)

Explanation / Answer

1. Two pathways involved in the invasion are:

a. Deliberate release: according to this pathway, different organisms are transported in different ways. For example, parasites are introduced as contaminants whereas plants are introduced as escapes. Vertebrates are transported as deliberate release.

b. Stowaway: in this type of pathway, there is unintentional entry with the help of transport vector. This pathway is associated with transport of humans. This pathway give the importance of transport infrastructure in the entry of humans.

2. Terrestrial vertebrates took the pathway like release, escape, stowaway ,unaided.

Yes, it is shared by another organisms like release pathway has been shared by terestial plants, aquatic vertebrates, aquatic plants.

Similarily, escape pathway have been shared by terrestrial plants and aquatic vertebrates.

3. One regulation associated with unintentional introduction is:

POLLUTER 'polluter pays ' international regulation

One regulation associated with unintentional introduction is:

Importer screening risk analysis national analysis.

4. Yes, invasive species are likely to continue to be introduced in future. The example is present in the paper it can be seen that Europe number of aliens species continue to increase whether it is terrestrial, freshwater, marine because of the increased number of commodity in europe.

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