Britas Klemens Eriksson Et Al. 2010

Britas Klemens Eriksson et al. 2010

Gastropod grazers:
Theodoxus fluviatilis / No grazers / Amphipod grazers:
Gammarus spp.
Supplement 1. Development of colonial diatoms on the water surface in the different grazer treatments.
Supplement 2. Univariate MANOVA results for the biomass of filamentous macroalgae in response to different grazer treatments with and without omnivores. If the block factor appeared P > 0.50, it was removed from the statistical model.
Source / Df / SS / F / P
Ceramium tenuicorne (Kützing) Wærn
Omnivore presence (O) / 1 / 0.000 / 0.20 / 0.660
Grazer identity (G) / 3 / 0.034 / 10.79 / 0.000
O x G / 3 / 0.012 / 3.90 / 0.020
Block / 4 / 0.002 / 0.60 / 0.668
Error / 28 / 0.028
Cladophora glomerata (L.) Kützing
Omnivore presence (O) / 1 / 0.004 / 2.01 / 0.167
Grazer identity (G) / 3 / 0.075 / 12.42 / 0.000
O x G / 3 / 0.024 / 3.92 / 0.019
Block / 4 / 0.007 / 0.84 / 0.512
Error / 28 / 0.054
Dictyosiphon foeniculaceus(Hudson) Greville
Omnivore presence (O) / 1 / 0.002 / 0.31 / 0.582
Grazer identity (G) / 3 / 0.028 / 1.54 / 0.226
O x G / 3 / 0.017 / 0.98 / 0.419
Block / 4 / 0.025 / 1.05 / 0.400
Error / 28 / 0.161
Pyliaella littoralis (L.) Kjellman
Omnivore presence (O) / 1 / 0.055 / 19.06 / 0.000
Grazer identity (G) / 3 / 0.058 / 6.68 / 0.002
O x G / 3 / 0.058 / 6.67 / 0.002
Block / 4 / 0.040 / 3.46 / 0.021
Error / 28 / 0.078
Ulva spp.
Omnivore presence (O) / 1 / 0.003 / 2.09 / 0.160
Grazer identity (G) / 3 / 0.018 / 4.49 / 0.011
O x G / 3 / 0.008 / 1.91 / 0.151
Block / 4 / 0.003 / 0.63 / 0.644
Error / 28 / 0.036

Supplement3

Supplement3. Species specific biomass of filamentous algae in outdoor mesocosms after 31 daysdepending on the grazer treatment and the presence or absence of the omnivorous shrimp Palaemon elegans; a) Ceramium tenuicorne, b) Cladophora glomerata, c) Dictyosiphon foeniculaceus, d) Pyliaella littoralis, and e) Ulva spp. Grazer treatments: ALL = adding both Theodoxus (250 ind.) and Gammarus (25 ind.),GAS = adding Theodoxus (500 ind.), AMP = adding Gammarus (50 ind.), NO = no grazers added. Means ± s.e.