Table 1 δ13C and δ15N means (standard deviations) per species in the two estuaries and PERMANOVA pairwise results (t) of the comparison of each species between the two estuaries (* and ** indicate significant differences of species in their isotopic signal, where *p < 0.05 and **p < 0.01). Trophic position: producer (P), primary consumer (C1), and secondary consumer (C2).
From: Human pressures on two estuaries of the Iberian Peninsula are reflected in food web structure
Species | Organisms Type | Guadalquivir | Guadiana | t | Guadalquivir | Guadiana | t |
|---|---|---|---|---|---|---|---|
δ13C | δ13C | δ15N | δ15N | ||||
Engraulis encrasicolus large | C2 | −26.33 (0.57) | −25.14 (0.84) | 2.61* | 19.5 (2.23) | 16.64 (1.05) | 2.6* |
Engraulis encrasicolus medium | C2 | −25.85 (0.4) | −25.78 (0.27) | 2.75* | 17.12 (0.4) | 16.49 (0.04) | 0.68 |
Engraulis encrasicolus small | C2 | −24.54 (0.39) | −25.29 (0.23) | 5.92** | 16.07 (0.1) | 16.92 (0.56) | 8.52** |
Pomatoschistus sp. | C2 | −23.53 (0.92) | −24.82 (0.03) | 3.13* | 18.39 (0.48) | 17.28 (0.36) | 4.15** |
Palaemon sp . | C2/C1 | −25.81 (1.45) | −24.29 (0.07) | 2.34* | 21.34 (2.62) | 16.1 (0.1) | 4.46** |
Synidotea laticauda | C2/C1 | −23.05 (1.72) | 14.82 (1.4) | ||||
Neomysis integer | C2/C1 | −27.46 (0.19) | −25.62 (0.06) | 20.62** | 20.74 (0.2) | 16.55 (0.12) | 40.34** |
Mesopodopsis slabberi | C1 | −27.99 (0.22) | −25.69 (0.03) | 22.84** | 15.42 (0.26) | 15.34 (0.37) | 0.41 |
Copepods | C1 | −29.32 (0.44) | −26.63 (0.07) | 13.39** | 13.85 (0.16) | 16.07 (0.37) | 12.26** |
Corbicula fluminea | C1 | −26.93 (0.76) | 14.28 (0.39) | ||||
Oligohaline vegetal matter | P | −24.89 (0.60) | −26.72 (0.02) | 8.98** | 10.25 (2.53) | 12.22 (0.37) | 1.92 |
SOM | P | −25.78 (0.05) | −27.2 (0.06) | 28.96** | 6.75 (0.52) | 5.83 (0.06) | 3.32 |
