6) An unusual mortality event is defined under the Marine Mammal Protection Act as "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response.
one additional whale per year) such as could occur from density-independent predation by killer whales, 3) occasional unusual mortality events ("catastrophes") that affect a percentage of the entire population, and 4) occasional mortality events ("group mortality") that affect an entire social group, which is a form of an Allee effect (Allee et al.
Occasional unusual mortality events, including but not limited to disease outbreaks, mass strandings, volcanic activity, toxic spills, and failure of Pacific salmon runs, could potentially impact a substantial portion of the CIBW population and were, therefore, important to consider.
Therefore, catastrophes and group mortality were not included together in any model scenario but were instead viewed as alternative ways of modeling unusual mortality events.
In addition, we included partial P gene sequences obtained from tissues and nasal swabs of northern seas otters (Enhydra lutris) from an unusual mortality event in south-central Alaska in 2006, as well as samples from a harp seal found in the Gulf of St.
In this study we confirmed that the virus isolated from the US 2006 unusual mortality event in seals was PDV.
This study was supported by the Marine Mammal Unusual Mortality Event Contingency Fund, USA, Department of Fisheries and Oceans Canada and the Department of Education and Learning, Northern Ireland, UK.
By examining the stranding data on a finer scale, we would be better prepared to evaluate any future unusual mortality event.
Prior to 1992 the highest number of bottlenose dolphin reported stranded for one year was 17 in 1991 (the year the network was formed), excluding the unusual mortality event of 1987 (n=60).