A Rocha Portugal Observatory Report 2009-2010
A Rocha Portugal Observatory Report 2009-2010
A Rocha Portugal Observatory Report 2009-2010
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A <strong>Rocha</strong> <strong>Portugal</strong> <strong>Observatory</strong> <strong>Report</strong> <strong>2009</strong>-<strong>2010</strong> 33<br />
Figure 2 The mean number of individuals and species recorded on each transect.<br />
The maximum number of species recorded during a single week (inclusive of all transects) was 27, recorded<br />
on 9 th June; the maximum number of individuals recorded during a single week was 107, also on 9 th June.<br />
Figure 3 shows the relationship between the number of species and number of butterflies recorded in any<br />
given week.<br />
Number of species recorded each week<br />
16<br />
14<br />
12<br />
10<br />
8<br />
6<br />
4<br />
2<br />
0<br />
16<br />
14<br />
12<br />
10<br />
8<br />
6<br />
4<br />
2<br />
0<br />
A1 A2 A3 M4<br />
Mean number of species per transect<br />
Mean number of individuals per transect<br />
0 20 40 60 80 100 120<br />
Number of individuals recorded each week<br />
Figure 3 The relationship between the number of species and number of individuals recorded<br />
on the transects each week.<br />
Comparison with previous surveys<br />
In order to draw a comparison with previous studies undertaken in the area, the relevant data from 1991,<br />
2004 and <strong>2009</strong> were extracted. The surveys in 1991 and 2004 took place over a longer period of time, the<br />
longest period of overlap being between 8 th June and 17 th August; a period of 11 weeks. As previous survey<br />
data were recorded by ‘week-ending’ the data from this survey were analysed similarly.
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