Down the food  chain.
Williams
Nigel
N
D000818:Animals; D003247:Conservation of Natural Resources / Q000379:methods / Q000639:trends*; D005398:Fisheries / Q000379:methods*; D005399:Fishes / Q000502:physiology*; D020387:Food Chain; D011157:Population Dynamics; D012616:Sea Cucumbers / Q000502:physiology*