Triple Whammy Led to High Rate of Bottlenose Dolphin Deaths in Gulf of Mexico

Death rates in the bottlenose dolphin population in the Gulf of Mexico have significantly increased over the past year. Studies have shown that the increased mortality rate is probably due to the combination of cold weather, the Deepwater Horizon oil spill and the large volumes of cold fresh water entering the Gulf from melting snow. A scientist explains that while each of these events alone may not lead to death,but together they can be fatal. From January 2011 to April 2011, 186 bottlenose dolphins were found washed ashore, this is double the normal amount found. At the end of the article it is mentioned that "It’s important to understand links between events that are human related and can potentially be managed, and those that just happen and that we may or may not be able to manage."
I wonder if the increase in deaths in the dolphin population is a large concern. What kind of effect will this have on the species in the long run? Is there something we can do? If so, should we do anything?
http://www.scientificamerican.com/article.cfm?id=triple-whammy-high-rate-bottlenose-dolphin-deaths&page=2