Biology — Eutrophication

digraph Eutrophication {
  node [shape=box, style=rounded];
  "Fertiliser runoff" -> "Excess nutrients";
  "Excess nutrients" -> "Algal bloom";
  "Algal bloom" -> "Blocks light";
  "Blocks light" -> "Plants die";
  "Plants die" -> "Bacteria decompose";
  "Bacteria decompose" -> "O2 depleted";
  "O2 depleted" -> "Fish die";
}