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… 0.2% of the total waterfowl population using a particular migration flyway, this being 10,000 or 20,000 birds in the … waterfowl, 4) provide an important staging point on a main migration route, 5) be representative of a vanishing type of wetland, …

… natural causes (such as droughts which affect community migration patterns), it is human activities that have … to small changes in these environmental parameters: the migration of sea fish into coastal lagoons for reproduc- tion … on the maintenance of wetland habitats along their migration routes. As they migrate, they come successively …

… source of food for fishes, spawning ground, nursery and/or migration path on which fish stocks, either within the …