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Vertical heterogeneity in physiological characteristics of Ulva spp. mats

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Abstract

In eutrophic areas, green macroalgae are frequently and for long periods arranged in mats, resulting in a steep light gradient. This study investigates the effect of this gradient on physiological characteristics [tissue nitrogen content, maximal photosynthetic efficiency (F v/F m), glutathione levels and redox ratio, absorbance and absorption spectra] of the green macroalga Ulva spp. Mats were sampled during the build-up (June), stationary (July), and decomposing (September) phases of a macroalgal bloom in the Veerse Meer, a eutrophic brackish (salinity 15–20 psu) lake in the southwest Netherlands. Water samples were taken for nutrient analyses. At all three sampling dates, the mats were composed almost entirely of Ulva spp.; in September the mats were in decay and covered with silt and epiphytes. In June and July, total dissolved inorganic nitrogen concentration (DIN) of the water within the mat was significantly higher than outside the mat. Pronounced vertical differences were found in tissue N, F v/F m values, total glutathione levels, glutathione redox ratios, and absorbance. In June and July, tissue N decreased from over 2.2% dry weight (DW; N-sufficient) in the bottom layers to around 1% DW (minimum level for survival) in the top layers. Wide-band absorption increased with depth in the mat and throughout the season, probably due to higher Chl a and b and lutein contents. The shape of the absorption spectrum was similar for all layers. The absorption of the silt/epiphyte film on the top Ulva layer was highest; its absorption spectrum (high absorption in the 500–560 nm range) indicates that the film on the top layers of the macroalgal mats mainly consisted of diatoms. In June, F v/F m and the glutathione redox ratio of the algae increased with depth in the layer, while total glutathione decreased. Low F v/F m values in the bottom and middle layers in September reflect the bad condition of the algae; the mats were largely decaying. It is concluded that multiple growth-limiting gradients occur in macroalgal mats: upper layers suffer from nitrogen limitation and photoinhibition while bottom layers are light limited. The algae in the mat acclimatize to low light conditions by increasing their absorption through increased pigment contents and by higher photosynthetic efficiency during the build-up and stationary period. This study qualifies the glutathione redox ratio as a promising candidate for stress indicator in macroalgae and provides suggestions for its further development.

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Acknowledgements

The authors wish to thank Drs. P.H. Nienhuis, P. Kamermans, and two anonymous referees for their comments on earlier drafts of this manuscript. Thanks are due to J. Nieuwenhuize, Y. Maas, and P. van Breugel for carrying out the C:N analyses and to J. Sinke for carrying out the pigments analyses. Anita Wijnholds and Tanja Poortvliet kindly assisted with the glutathione analysis. Jan Peene, Ko Verschuure, and Monique de Bie provided invaluable assistance in collecting the algae. This study is carried out in the framework of the EUMAC project, which is funded by the Environment and Climate Programme of the European Commission (no. EV5V-CT93-0290). This is publication no. 3158 of the NIOO-KNAW, Netherlands Institute of Ecology.

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Malta, E., Rijstenbil, J.W., Brouwer, P.E.M. et al. Vertical heterogeneity in physiological characteristics of Ulva spp. mats. Marine Biology 143, 1029–1038 (2003). https://doi.org/10.1007/s00227-003-1134-4

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