期刊论文详细信息
Frontiers in Marine Science
Is the South-Mediterranean Canopy-Forming Ericaria giacconei (= Cystoseira hyblaea) a Loser From Ocean Warming?
Giuseppina Alongi1  Giuliana Marletta1  Stanislao Bevilacqua2  Marina Srijemsi2  Mauro Tretiach2  Fabio Candotto Carniel2  Annalisa Falace2  Gilda Savonitto2 
[1] Department of Biological, Geological and Environmental Sciences, University of Catania, Catania, Italy;Department of Life Sciences, University of Trieste, Trieste, Italy;
关键词: thermal stress;    early life stages;    photosynthetic efficiency;    marine forest;    climate change;    conservation;   
DOI  :  10.3389/fmars.2021.760637
来源: DOAJ
【 摘 要 】

Canopy-forming brown algae support highly productive ecosystems whose decline has been attributed to the interplay of several anthropogenic disturbances. Climate change could have disruptive effects on the biology of these species, but the role of temperature in the development of early life stages is poorly understood. The aim of this study was to assess the response of Ericaria giacconei, a winter-reproducing Southern–Mediterranean endemic species, to thermal stress by testing five temperatures (12, 15, 18, 24, and 28°C) on adults and early stages. Chlorophyll a fluorescence of adult plants was measured at 0, 24, 72, and 120 h on nine fronds in each of the three aquaria per treatment. To assess egg release, zygote settlement, and embryo growth rate, approximately 1,200 receptacles were cultured on six Petri dishes per temperature treatment, and 10 random subsections of 2 ×2 mm were examined in three Petri dishes at 0, 20, 44, and 92 h after fertilization. Adult plants showed a plastic physiological response, and thermal stress had no significant effect on PSII efficiency. Embryos fully developed only at 12 and 15°C. Mortality increased at 18 and 24°C, and no zygotes survived at 28°C. In a scenario of further increasing temperatures, the effects of warming could affect the recruitment of E. giacconei and increase its vulnerability to further stresses. These effects on the survival of early stages, which are the bottleneck for the long-term survival of the species, should be taken into account in conservation and restoration measures to maintain canopy-forming macroalgal populations and associated biodiversity and ecosystem services.

【 授权许可】

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