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Table 2 Results of linear mixed model fits testing for significant changes in timing of peak value across 43 years for 10 different factors measured in the San Francisco Estuary, 1972–2014

From: Long-Term Seasonal Trends in the Prey Community of Delta Smelt (Hypomesus transpacificus) Within the Sacramento-San Joaquin Delta, California

  Intercept Time Variance AR1
Factor Estimate SE P Estimate SE P Station Residual Included Phi
Water temperature 204.62 1.03 <0.0001    0.107 0.86 601.23 No  
Water clarity 233.16 5.01 <0.0001    0.269 67.40 9710.13 Yes 0.113
Electrical conductivity −1779.4 649.97 0.0064 1.01 0.33 0.002 619.51 9672.72 No  
Chlorophyll-a 1871.59 468.05 0.0001 −0.86 0.23 0.0004 72.93 3806.89 No  
Total zooplankton 1522.08 484.01 0.0017 −0.67 0.24 0.0059 94.67 5365.56 No  
Eurytemora 5265.34 467.69 <0.0001 −2.57 0.23 <0.0001 180.63 4003.09 Yes 0.112
Pseudodiaptomus 1635.89 717.97 0.023 −0.72 0.36 0.047 222.31 2396.10 Yes 0.118
Other calanoids 1690.63 442.77 0.0001 −0.75 0.22 0.0008 585.16 4487.66 No  
Cyclopoids 173.81 7.58 <0.0001    0.526 550.84 8675.06 Yes 0.11
Non-copepods 3787.14 500.12 <0.0001 −1.81 0.25 <0.0001 186.87 5727.46 No  
  1. Results include parameter estimates and test statistics for the intercept and slope (time), variance statistics, and whether autocorrelation was present resulting in a first-order autoregressive term (AR1) being included in analysis