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1. Assessment of Posidonia oceanica traits along a temperature gradient in the Mediterranean Sea shows impacts of marine warming and heat waves

Author

Patrizia Stipcich, Eugenia T. Apostolaki, Niki Chartosia, Pavlos Theofilos Efthymiadis, Carlos E. Jimenez, Gabriella La Manna, Arianna Pansini, Elena Principato, Vasilis Resaikos, and Giulia Ceccherelli

Subjects
climate change, lepidochronological analysis, marine heat waves, reconstruction, shoot morphology, warming, Science, General. Including nature conservation, geographical distribution, QH1-199.5
Abstract

Global warming and Marine Heat Waves (MHWs) are having large-scale impacts on the seagrasses and their effects on the Mediterranean endemic Posidonia oceanica need to be properly defined. This research aimed to sharpen the knowledge on P. oceanica response to the warming by correlating the shoot morphology and the productivity of the seagrass to temperature conditions and MHW occurrence. Two correlative studies, along a Mediterranean temperature range (sites at the same latitude), were conducted: one explored the associations of summer 2021 Sea Surface Temperature (SST) and MHWs on P. oceanica morphology and the other used a reconstruction technique (lepidochronological analysis) to relate past temperature conditions and MHW occurrence to proxies of seagrass productivity for the corresponding periods. The results showed that the mean summer temperature affected the P. oceanica leaf necrosis and that MHWs occurrence changed the morphology of the plant by lowering the leaf area and increasing leaf necrosis. Interesting results were also found relating the past thermal environment, since rhizome biomass has been negatively affected by the number of MHWs and rhizome length by the temperature range. This research provides fundamental insights about P. oceanica changes linked to warming and MHWs, identifying the potential plant indicators assisting future experimental and modelling studies. To the best of our knowledge, this is the first time a reconstruction technique is used to evaluate the effects of past MHWs on the morphology and productivity of a plant species.

Published
2022
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2. Effects of high temperature and marine heat waves on seagrasses: Is warming affecting the nutritional value of Posidonia oceanica?

Author

Patrizia Stipcich, Pedro Beca-Carretero, Xosé Antón Álvarez-Salgado, Eugenia T. Apostolaki, Niki Chartosia, Pavlos Theofilos Efthymiadis, Carlos E. Jimenez, Gabriella La Manna, Arianna Pansini, Elena Principato, Vasilis Resaikos, Dagmar B. Stengel, Giulia Ceccherelli, Ministero dell'Istruzione, dell'Università e della Ricerca, Università degli Studi di Sassari, University of Galway, and Stipcich, Patrizia

Subjects
Nitrogen, Mediterranean sea, Bioindicators, Climate change, General Medicine, Nutrients, Aquatic Science, Fatty acids, Oceanography, Conserve and sustainably use the oceans, seas and marine resources for sustainable development, Pollution, Carbon
Abstract

9 pages, 5 figures, 4 tables.-- Under a Creative Commons license, Primary producers nutritional content affects the entire food web. Here, changes in nutritional value associated with temperature rise and the occurrence of marine heat waves (MHWs) were explored in the endemic Mediterranean seagrass Posidonia oceanica. The variability of fatty acids (FAs) composition and carbon (C) and nitrogen (N) content were examined during summer 2021 from five Mediterranean sites located at the same latitude but under different thermal environments. The results highlighted a decrease in unsaturated FAs and C/N ratio and an increase of monounsaturated FA (MUFA) and N content when a MHW occurred. By contrast, the leaf biochemical composition seems to be adapted to local water temperature since only few significant changes in MUFA were found and N and C/N had an opposite pattern compared to when a MHW occurs. The projected increase in temperature and frequency of MHW suggest future changes in the nutritional value and palatability of leaves, This research was financially supported by Botany and Plant Science at University of Galway, by the project Marine Habitats Restoration in a Climate Change-impaired Mediterranean Sea [MAHRES] funded by the Italian Ministry of Research under the PRIN 2017 Program (Project N. 2017MHHWBN; CUP: 74I19001320001), by “Fondo di Ateneo per la Ricerca 2019” by the University of Sassari, by PON - National Operational Programme - Research and Innovation 2014–2020, PhDs and research contracts on innovation-related topics and by the project DRESSAGE (MIS5045792) (through the Operational Program ‘Competitiveness, Entrepreneurship and Innovation’ (EPAnEK 2014–2020)

Published
2023

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