aquatic brackish coastal ecosystem estuary forest India mangal mangrove mangrove forest mangrove swamp marine Rhizophora Rhizophoraceae saline shrubs trees bird blue brown bushes feathers ocean sky Waters edge white river swamp. mud tidal water crane lake leaf leafs Nyberg reflection reflections sun sunlight sunset tree Africa bush egipt low-tide paddle salt water sea seacost shrub wade water bird gray pelican