Table 2 Outputs of Generalized Additive Models (GAMs) of long-term trends in δ13C values, Trophic Position (TP) and Specialization index (s) of Gonatus fabricii. In GAMs, k indicates the number of knots and s represents the smoother (year), where values are effective degrees of freedom. n – sample size. Significant p-values are in bold
From: Insights on long-term ecosystem changes from stable isotopes in historical squid beaks
δ13C | TP | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Subsection 1 | Subsection 1 | ||||||||||||
Time | n | Intercept (mean ± SE) | k | s(Year) | p | Deviance explained, % | Time | n | Intercept (mean ± SE) | k | s(Year) | p | Deviance explained, % |
1930–20191 | 36 | -17.56 ± 0.09 | 4 | 2.96 | 0.0003 | 45.3 | 1900–2019 | 54 | 3.60 ± 0.04 | 3 | 1.00 | 0.0255 | 9.2 |
Subsection 8 | Subsection 8 | ||||||||||||
1930–20191 | 37 | -16.62 ± 0.08 | 4 | 2.94 | 0.0009 | 40.0 | 1900–2019 | 56 | 4.78 ± 0.04 | 4 | 2.91 | 0.0004 | 30.2 |
s | s | ||||||||||||
1900–2019 | 58 | 0.42 ± 0.02 | 5 | 3.93 | < 0.0001 | 46.2 | 1900–2019 | 58 | 0.80 ± 0.01 | 5 | 3.94 | < 0.0001 | 70.1 |