When manatees and alligators are members of your backyard ecosystem, it’s like living with a ready-made science project. Justin Conner took full advantage of the biodiversity bursting in and around the Florida canal that linked his childhood home to the ocean. There were peacock bass and cichlids to hook. There were frogs and toads to collect. There were black racers and corn snakes to stalk beneath the dense, tropical foliage.