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Table 3 Summaries of three-way crossed permutational univariate analyses testing for effects of method, platform and season on the abundance of each ecological category and on species richness, at each of the two investigated depth layers (0–6 and 12–18 m)

From: Assessing the suitability of a remotely operated vehicle (ROV) to study the fish community associated with offshore gas platforms in the Ionian Sea: a comparative analysis with underwater visual censuses (UVCs)

  df Planktivorous Pelagic Nekto-benthic Crypto-benthic Species richness
0–6 m
Method 1 0.176 n.s. 1 n.s. 0.001** 0.001** 0.001**
Platform 2 0.204 n.s. 0.324 n.s. 0.069 n.s. 0.055 n.s. 0.101 n.s.
Period 2 0.047* 0.029* 0.001** 0.021* 0.031*
Meth × Plat 2 0.132 n.s. 0.83 n.s. 0.597 n.s. 0.007** 0.004**
Meth × Period 2 0.071 n.s. 1 n.s. 0.056 n.s. 0.841 n.s. 0.023*
Plat × Period 4 0.454 n.s. 0.353 n.s. 0.539 n.s. 0.849 n.s. 0.031*
Meth × Plat × Period 4 0.31 n.s. 0.938 n.s. 0.16 n.s. 0.317 n.s. 0.042*
Res 36      
Total 53      
12–18 m
Method 1 0.008** 0.111 n.s. 0.001** 0.001** 0.001**
Platform 2 0.001** 0.148 n.s. 0.022 n.s. 0.001** 0.616 n.s.
Period 2 0.001** 0.923 n.s. 0.002** 0.663 n.s. 0.121 n.s.
Meth × Plat 2 0.005** 0.399 n.s. 0.05 n.s. 0.001** 0.686 n.s.
Meth × Period 2 0.001** 0.968 n.s. 0.017 n.s. 0.664 n.s. 0.087 n.s.
Plat × Period 4 0.468 n.s. 0.548 n.s. 0.108 n.s. 0.092 n.s. 0.409 n.s.
Meth × Plat × Period 4 0.318 n.s. 0.815 n.s. 0.588 n.s. 0.099 n.s. 0.490 n.s.
Res 36      
Total 53      
  1. Significance levels: *p < 0.05; **p < 0.01; n.s. not significant, Meth method, plat platform