Table 3 Mean (±SD) δ13C across all three stromatolite sampling locations during August 2015 for the organic matter sources collected within the main stromatolite pools.

From: Non-reliance of metazoans on stromatolite-forming microbial mats as a food resource

 

δ13C

GLS model

Mean (±SD) ‰

C (±SE)

t

P

var

Stromatolite microalgae

−17.6 (±1.4)

*

  

0.11

Benthic SOM

−20.4 (±0.4)

−2.5 (±0.4)

−5.9

<0.001

0.00

Pool macroalgae

−25.3 (±5.9)

−8.0 (±3.8)

−2.1

0.06

1.00

Pool microalgae

−16.7 (±3.9)

0.6 (±2.2)

0.3

0.78

0.59

Pool POM

−20.5 (±0.8)

−3.0 (±0.5)

−6.5

<0.001

0.06

Stromatolite SOM

−24.0 (±0.2)

−6.6 (±0.6)

−11.8

<0.001

0.10

Cape Recife

−22.3 (±4.4)

*

   

Schoenmakerskop

−19.8 (±5.6)

0.7 (±0.4)

2.1

0.07

 

Seaview

−20.0 (±2.6)

−0.6 (±0.0)

>100

<0.001

 
  1. *‘Stromatolite microalgae’ and ‘Cape Recife’ are the reference values used in the GLS analysis. SOM (sediment organic matter); POM (particulate organic matter). Also shown are the results of a generalised least squares (GLS) analysis of δ13C, with the stromatolite pool organic matter sources and sampling sites as model predictor variables. Different variance structures (var) according to organic matter source accounted for within the GLS model, as well as the coefficient (C) and test significance of each predictor, are also indicated.
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