If you're interested in marine applications of networked sensros, you should check out The Northeast Passive Acoustics Network (NEPAN). A new paper exploring technologies being used to monitor cetaceans discusses this approach in a section about passive acoustics (p2):
The Northeast Passive Acoustics Network (NEPAN, Van Parijs et al., 2015), for example, combines mobile and stationary passive acoustic platforms to form a network of sensors that provide long-term year-round information on the presence and spatial distribution of cetaceans, as well as fish. The data can be used to address critical conservation and management needs (e.g. seasonal use of areas by particular species including some real-time capabilities), as well as to reduce threats from anthropogenic activities (e.g. shipping, offshore energy activities). Part of NEPAN is a set of near real-time automated buoys (Spaulding et al., 2009) that report on the presence of North Atlantic right whales, Eubalaena glacialis, in the shipping channel approaching Boston, Massachusetts, U.S.A. Other parts of NEPAN are archival, so upon data processing, the hourly, daily, weekly, etc., utilization of particular areas by particular species can be explored. Although it may not seem novel, the ability to know year-round patterns of habitat use by cetaceans is a significant step forward for answering questions of basic ecology as well as helping to address conservation concerns.
Full article: Nowacek, D. P., et al., Studying cetacean behaviour: new technological approaches and conservation applications, Animal Behaviour (2016), http://dx.doi.org/10.1016/j.anbehav.2016.07.019