Burrowing Shrimp 
Population Density (# nr 2 ) 
Om"* 
1-30 rrv 2 
1-50 m 2 
1-40 m 2 
♦ 31-80 
51-150 
41-115 
♦81-150 
151-280 
♦ 115-220 
♦ 151-200 
♦ 281-400 
♦ 221-300 
♦ >200 
♦ >400 
♦ >300 
Upogebia 
Neotrypaea 
Mixed Spp. 
Figure A.3 a) Distribution and abundance of two species of burrowing shrimp (red = Neotrypaea 
califbrniensis, blue = Upogebia pugettensis, green = mixed species; darker color = higher 
density), b) Distribution and magnitude of benthic-pelagic flux of DIN in Yaquina Estuary 
(positive values = efflux from sediments, negative values = uptake by sediments). 
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