Unusual Mortality Events of Harbor Porpoise Strandings in North Carolina, 1997–2009
Figure 2
(a) Weekly harbor porpoise strandings in 1999 (darker blue bars) and 2005 (lighter blue bars) compared to weekly threshold A (mean + 2 standard deviations: 1997-1998, 2000–2004) (black horizontal solid line) and threshold B (mean + 2 standard deviations: 1997-1998, 2000–2004, 2006–2009) (red horizontal dashed line). (b) Annual harbor porpoise strandings during 1997–2009 (blue bars) compared to annual threshold A (black horizontal solid line) and threshold B (red horizontal dashed line).
