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Eco-physiological response of the kelp Laminaria ochroleuca to varying temperature and nutrients: implications under climate change

2016; Frontiers Media; Volume: 3; Linguagem: Inglês

10.3389/conf.fmars.2016.04.00106

2296-7745

João N. Franco, T. Maestre Fernando, Iacopo Bertocci, García Laura, Martínez Brezo, Arenas Francisco,

Cephalopods and Marine Biology

Event Abstract Back to Event Eco-physiological response of the kelp Laminaria ochroleuca to varying temperature and nutrients: implications under climate change Joao N. Franco1, 2*, Fernando Tuya3, Iacopo Bertocci1, Laura García4, Brezo Martínez4 and Francisco Arenas1 1 CIIMAR - Centro Interdisciplinar de Investigação Marinha e Ambiental, Portugal 2 Faculdade de Ciências da Universidade do Porto, Departamento de Biologia, Portugal 3 Marine Sciences Faculty, Universidad de Las Palmas de Gran Canaria, IU-ECOAQUA, Grupo en Biodivesidad y Conservación, Spain 4 Rey Juan Carlos University, Spain The loss of marine foundation species, such as kelps, from temperate ecosystems has been documented and linked to climatic variables and co-occurring human perturbations. Sea surface temperature (SST) and nutrients typically covary over local and regional scales and might play a crucial role in maintaining these ecosystems. Examining the independent and interactive effects of such factors on kelp physiological performance is essential to understand and predict their influence on patterns of distribution of ecologically important species under global environmental change. By means of an outdoor mesocosm facility, crossed combinations of increasing levels of SST and availability of nutrients were experimentally established on juvenile individuals of the ‘golden kelp’, Laminaria ochroleuca, from the northwestern of Iberian peninsula. Eco-physiological response variables included mortality, growth, Carbon and Nitrogen contents and photosynthetic efficiency of L. ochroleuca. Results were incorporated into a Species Distribution Model (SDM) combining in situ presence records and with climatic and non-climatic data to forecast distribution patterns of L. ochroleuca under different climate change scenarios. Temperatures > 26 ºC were lethal irrespective of nutrients availability. Optimal growth of juvenile sporophytes occurred at temperatures between 12 °C and 16 ºC and no nutrient limitation ( >35 µM N : 5 µM P). The highest C:N ratios were found in all non-enriched treatments maintained at 18º C. The maximum photosynthetic potential (ETRmax) and efficiency (α) were positively affected by nutrient enrichment and inversely related to SST. The SDM, where maximum SST was the main predictor, suggests a future expansion towards northern latitudes and a retreat from the current distribution range as a likely consequence of ocean warming. Such a model prediction is consistent with present ecophysiological results. The distributional shift of kelp might alter local patterns of associated biodiversity and abiotic and biological processes, with potentially severe ecological and economic consequences. Acknowledgements Financial support was provided by the Portuguese Fundação para a Ciência e a Tecnologia (FCT) through the projects ‛Efeitos do clima oceânico na macroecologia e resiliência a perturbações dos povoamentos de kelps’ – OCEANKELP (PTDC/MAR/109954/2009) and a PhD grant (SFRH/BD/84933/2012) to Joao N. Franco. Keywords: Laminariales, Macrophyte, Brown seaweed, Portugal, Climate Change, multiple perturbations Conference: IMMR | International Meeting on Marine Research 2016, Peniche, Portugal, 14 Jul - 15 Jul, 2016. Presentation Type: Oral presentation Topic: Biodiversity, Conservation and Coastal Management Citation: Franco JN, Tuya F, Bertocci I, García L, Martínez B and Arenas F (2016). Eco-physiological response of the kelp Laminaria ochroleuca to varying temperature and nutrients: implications under climate change. Front. Mar. Sci. Conference Abstract: IMMR | International Meeting on Marine Research 2016. doi: 10.3389/conf.FMARS.2016.04.00106 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 13 May 2016; Published Online: 13 Jul 2016. * Correspondence: Mr. Joao N Franco, CIIMAR - Centro Interdisciplinar de Investigação Marinha e Ambiental, Porto, 4050-123, Portugal, joaonunofranco@gmail.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Joao N Franco Fernando Tuya Iacopo Bertocci Laura García Brezo Martínez Francisco Arenas Google Joao N Franco Fernando Tuya Iacopo Bertocci Laura García Brezo Martínez Francisco Arenas Google Scholar Joao N Franco Fernando Tuya Iacopo Bertocci Laura García Brezo Martínez Francisco Arenas PubMed Joao N Franco Fernando Tuya Iacopo Bertocci Laura García Brezo Martínez Francisco Arenas Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.