Table 2 Ten Friedman tests were used to assess changes in juvenile, adult, and total D. antillarum population density, juvenile coral recruit abundance, and macroalgae cover over a three-year period.

From: The ecological importance of habitat complexity to the Caribbean coral reef herbivore Diadema antillarum: three lines of evidence

Reef type

Predictor

Response variable

Control reef

Year (2015, 2016, 2017)

Juvenile D. antillarum abundance m−2

Control reef

Year (2015, 2016, 2017)

Adult D. antillarum abundance m−2

Control reef

Year (2015, 2016, 2017)

Total D. antillarum abundance m−2

Control reef

Year (2015, 2016, 2017)

Juvenile coral recruit abundance m−2

Control reef

Year (2015, 2016, 2017)

Macroalgae cover (%)

Artificial reef

Year (2015, 2016, 2017)

Juvenile D. antillarum abundance m−2

Artificial reef

Year (2015, 2016, 2017)

Adult D. antillarum abundance m−2

Artificial reef

Year (2015, 2016, 2017)

Total D. antillarum abundance m−2

Artificial reef

Year (2015, 2016, 2017)

Juvenile coral recruit abundance m−2

Artificial reef

Year (2015, 2016, 2017)

Macroalgae cover (%)

  1. Changes in the value of each variable were assessed independently, and separate analyses were conducted for the control and artificial reefs.