dr. mike davidson. with barely enough time to train, but anxious to find some way to honor their friend, and to support his family. davidson's wife was pregnant with the couple's fourth child when he was killed. mikayla, named for her father was born two weeks ago. >> you would like to think that if something like this happened to you, that a community would come together and help take care of your family. that's a huge motivation for us to do th. >> reporter: dr. davidson's father will be involved and along the route on marathon monday. just as he was five years ago, when his son ran the race to celebrate his 40th birthday. >> i'd like to think that michael is watching. and is is very grateful for what they're doing. in his memory. >> reporter: the team has raised more than $70,000 for davidson's family with donations coming in from around the wo >> here's a guy who was trying to do good, and you know for his his life to be taken in this manner it's unfathomable. >> i think it's easy for people to want

dr. davidson: business as usual is not really an option. our economy is based upon having tourists wanting to come here and spend time here. they're not gonna come here if the estuaries are full of algae that smell rotten. so it's extremely important, and we're getting to a tipping point where we have to do something. and i think the same is true across the globe. dudley: we know that people are still gonna want to come to the cape and that growth is gonna continue so what we're really interested in trying to do is appropriately manage that growth. we believe that we can still save the habitat and that it isn't beyond a point of no return and that's what we're actively trying to do. narrator: by combining census data with physical data collected in field studies scientists can increase the accuracy of their models and help planners and policy makers prepare for future growth. dr. riche: what i do, essentially is give people the base to look into the future, because we make connections between people and all these things that have costs. we