Call it what you will. Call it scavenging which has a negative connotation and calls up visions of vultures, or call it re-use or re-cycling or re-purposing, all of which are more fashionable terms for the same thing. Regardless, of what you call it, once upon a time, it was the one and only way to get materials to build a boat, especially in the arctic where boat materials did not grow and had to be scavenged on the beach.
You can view scavenging as an act of desperation or opportunism or some other unsavory name, but whatever you want to think of it, it is still going on as illustrated in the following photos.
Just recently, I read somewhere of a theory that says essentialy that nature favors processes that speed up the work or entropy. Left to the strictly physical processes like oxidation and abrasion, the fence and the sunken boat would probably have been sitting as is for another few decades. But with the aid of scavengers, the job of entropy has been favorably accelerated.