Ecological Archives E094-098-A2

Laura Tamburello, Fabio Bulleri, Iacopo Bertocci, Elena Maggi, Lisandro Benedetti-Cecchi. 2013. Reddened seascapes: experimentally induced shifts in 1/f spectra of spatial variability in rocky intertidal assemblages. Ecology 94:1102–1111. http://dx.doi.org/10.1890/12-1293.1

Appendix B. Effects of Cystoseira amentacea clipping according to a random spatial pattern (CWS treatment).

Table B1. Mixed effect model fitted to log-transformed spectral density (SD) and percentage cover (%C) of algal turf, at different times. The analysis compares transects where removal of fronds was applied with white distribution (CWS) to unmanipulated controls (C). *P < 0.05, ** P < 0.01, *** P < 0.001. Spectral coefficients are estimated as the inverse of the regression coefficients in the SD analysis. Treatment effects on intercepts of SD are omitted for clarity. Standard errors are enclosed in brackets.

 

June 2007

October 2008

 

SD

%C

SD

%C

C

0.017 (0.078)

5.127***(1.376)

-0.370 (0.215)

8.787* (4.082)

CWS

-0.109 (0.149)

5.857** (1.945)

0.831* (0.325)

7.728 (5.773)

         

Correlation structure

AR1

 

Exp

Range

 

 

 

7.768  

Nugget

 

 

 

0.790

Phi

 

0.100

 

 

 

FigB1

Fig. B1. Treatment effects on the slopes of the relationship between spectral density of percent cover of algal turf and frequency of observation, on a logarithmic scale, in June 2007. Panels show controls (C) and additional transects (CWS, where the fronds of Cystoseira were removed according to a random pattern), with two replicated transects (filled and open symbols) per treatment.


 

FigB2

Fig. B2. Treatment effects on the slopes of the relation between spectral density of percent cover of algal turf and frequency of observation, on logarithmic scale, in October 2008. Panels show controls (C) and additional transects (CWS, where the fronds of Cystoseira where removed according to a random pattern), with two replicated transects (filled and open symbols) per treatment.


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