Nueces River Up Marsh Down Marsh 



Rincon Bayou Aransas Pass 

 Mouth 



Figure 3: Variation of carbon Isotopic ratios in different feeding habitats. A. Potential food sources. 8. 

 Juvenile brown shrimp Penaeus aztecus as they migrate through ecosystem as indicated by dotted lines with 

 arrows. 



Appendix E <* E-15 



