Appendix B. Estimated proportion of Spartina hybrid and other food sources in macrofaunal diets based on natural abundance stable isotope data. Results are derived from application of 2 source and 3-source concentration-dependent mixing models (Phillips and Koch 2002). See main article for methods.
TIDAL FLAT |
HYBRID SPARTINA |
||||
Spartina/Ulva |
POM/SOM/Diatom |
Spartina |
Cyano/Ulva |
||
Corophium sp. |
0.46 |
||||
Traskorchestia traskiana |
0.82 |
0.57 |
0.22 |
0.21 |
|
Urosalpinx cinerea |
0.61 |
0.8 |
0.20 |
0 |
|
Nassarius obsoleta |
1.00 |
||||
Venerupis philippinarum |
0.04 |
0.56 |
0.00 |
0.44 |
|
Mya arenaria |
0.60 |
||||
Gemma gemma |
0.55 |
||||
Capitella sp. |
1.00 |
0.01 |
0.44 |
0.54 |
|
Eteone dilatae |
1.00 |
0.15 |
0.30 |
0.54 |
|
Eteone californica |
1.00 |
||||
Nereis succinea |
1.00 |
0.78 |
0.21 |
0.00 |
|
Tharyx sp. |
1.00 |
||||
Polydora cornuta |
1.00 |
||||
Streblospio benedicti |
0.59 |
||||
Unid. Sponge |
0.00 |
0.83 |
0.17 |
0.00 |
|
Gnorimosphaeroma sp. |
- |
0.48 |
0.52 |
0.00 |
|
Geukensia demissus |
- |
0.82 |
0.00 |
0.18 |
|
Boccardia sp. |
- |
0.00 |
0.23 |
0.77 |
|
Exogone sp. |
- |
||||
Tubificidae |
- |
0.48 |
0.00 |
0.52 |
|
Balanus glandula |
- |
||||
Hemigrapsus oregonensis |
- |
||||
Carcinus maenas |
- |
0.65 |
0.35 |
0 |
|
*Spartina/Ulva vs. POM/SOM/Diatom
** Spartina vs. Cyanobacteria+Ulva vs POM/SOM/Diatoms
LITERATURE CITED
Phillips, D. L., and P. L. Koch. 2002. Incorporating concentration dependence in stable isotope mixing models. Oecologia 130:114–125.