3c. As part of a preliminary analysis, you estimate the number of species in eac

Question

3c. As part of a preliminary analysis, you estimate the number of species in each group that are potentially threatened based on the 2008 data. There is incomplete data on the conservation status of many species in the four major groups, so you use data that is presently available to estimate how many species in the groups might potentially be threatened.

3d. Complete Table 3 (your completed table will be referred to as Table 4). First, calculate the proportion of evaluated species that are threatened in each group. Next, calculate the estimated number of described species that are potentially threatened, based on the number of described species and the proportion of evaluated species that are threatened in each group. Round your estimated number of potentially threatened species to the nearest whole integer.

Table 1 IUCN Red List of Threatened Species Number of species Number of species Number of species Group described evaluated threatened Vertebrates 61,259 5,966 26,604 6,161 2,496 Invertebrates 1,232,384 8,448 11,995 Plants 288,468 3 3 Lichen /Fungi 47,000 Source: Data from the 2008 IUCN Red List of Threatened Species, as reported in Vie et al. (2009).

Explanation / Answer

Based on the table % of evaluated species which are threatened in:

Vertebrates: (5966 x 100) / 26604 = 22%

Invertebrates: (2496 x 100) / 6161 = 40%

Plants: (8448 x 100) / 11995 = 70%

Lichen: (3 x 100) / 3 = 100%

Based on the table % of described species which are threatened in:

Vertebrates: (5966 x 100) / 61259 = 10%

Invertebrates: (2496 x 100) / 1232384 = 0.2%

Plants: (8448 x 100) / 288468 = 3%

Lichen: (3 x 100) / 47000 = 0.01%

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