A more detailed table, including data on all known causes of dugong mortality, is listed in the appendices as Figure 1. When taking into account natural causes of mortality (such as disease and ill health), incidences where the cause of mortality could not be determined, and incidences which were unable to be confirmed, a more accurate picture of the proportion of additional impact on dugong populations boat strike has can be determined (Table 2). With a total of 46 dugong mortalities attributed to boat strike, the process was notably the leading cause of anthropogenic mortality in 7 of the 15 years data has been recorded.
Table 2: Proportion of anthropogenic mortalities of dugongs attributable to boat strike for the period 1996-2010
Year
|
1996
|
1997
|
1998
|
1999
|
2000
|
2001
|
2002
|
2003
|
2004
|
2005
|
2006
|
2007
|
2008
|
2009
|
2010
|
Total confirmed mortality
|
16
|
20
|
9
|
25
|
33
|
18
|
15
|
14
|
15
|
10
|
5
|
10
|
10
|
21
|
34
|
Natural causes
|
3
|
7
|
4
|
10
|
23
|
11
|
5
|
6
|
2
|
3
|
0
|
2
|
3
|
10
|
16
|
Anthropogenic
|
13
|
13
|
5
|
15
|
10
|
7
|
10
|
8
|
13
|
7
|
5
|
8
|
7
|
11
|
18
|
% anthro. boatstrike
|
23.1
|
30.8
|
40.0*
|
0.0
|
30.0
|
57.1*
|
70.0*
|
37.5*
|
30.8*
|
28.6
|
40.0*
|
25.0
|
28.6*
|
27.3
|
22.2
|
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