Ecological Archives E091-040-A6

Steven E. McMurray, Timothy P. Henkel, and Joseph R. Pawlik. 2010. Demographics of increasing populations of the giant barrel sponge Xestospongia muta in the Florida Keys. Ecology 91:560–570.

Appendix F. Size-frequency distributions at each site in 2000, 2003, and 2006; and results of log-linear analysis of Conch Reef size-frequency data.

Size-frequency distributions at all sites became increasingly dominated by smaller sponges (Fig F1). Size-frequency distributions were significantly different among years and between sites (Table F1).

 
   FIG. F1. Size-frequency distributions of Xestospongia muta at (A) 15 m Conch Reef, (B) 20 m Conch Reef, (C) 30 m Conch Reef, and (D) 15 m Pickles Reef in 2000, 2003, and 2006.

TABLE F1. Log-linear analysis of Conch Reef size-frequency data. Analyses were based on a three-way contingency table with the response variable state, S, (six stages), and explanatory variables time, T, (three years), and location, L, (four sites).

Model

G2

df

P

Contrast

Effect

G2

∆df

P

M1 = TL, S

134.895

55

<0.001

M2 vs. M1

T

42.065

10

<0.001

M2 = TL, TS

92.830

45

<0.001

M4 vs. M3

T

42.252

10

<0.001

M3 = TL, LS

79.193

40

<0.001

M3 vs. M1

L

55.702

15

<0.001

M4 = TL, TS, LS

36.941

30

0.179

M4 vs. M2

L

55.889

15

<0.001

M5 = STL

0

0

1.000

M5 vs. M4

T × L

36.941

30

0.222


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