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Intertidal zones are one of the most studied habitats in the world. However, in Antarctica, further studies are needed for a more complete understanding of these systems. When conspicuous Antarctic intertidal communities occur, macroalgae are a key component. Given that intertidal communities have a fast response to variations in environmental conditions and could reflect climate fluctuations, we conducted a non-destructive study with photographic transects in an intertidal zone at Potter Peninsula, Isla 25 de Mayo/King George Island, over four years and during five months of the warm season. We tested the general hypothesis that macroalgal intertidal communities are mainly structured by the vertical stress gradient and that changes in temperature between seasons and between years have a great influence in the macroalgal community structure. Spatial, seasonal and inter-annual variations were studied using GLM, quantile regression and NMDS ordinations. The vertical stress gradient was the main factor that explained macroalgal cover. The Low and the Middle level shared similarities, but the latter was more variable. The High level had the lowest cover, richness and diversity. The dominant species here was the endemic red alga Pyropia endiviifolia, which is strongly adapted to extreme conditions. At the Middle level, there was a significant increase in macroalgal cover during spring months, and it stabilized in summer. Inter-annual variations showed that there is a strong variation in the total macroalgal cover and community structure over the studied years. Environmental conditions have a significant effect in shaping the studied intertidal community, which is very sensitive to climate oscillations. An increase in temperature produced a decrease of annual ice foot cover, number of snow days and - as a result - an increase in macroalgal cover. In a global climate-change scenario, a shift in species composition could also occur. Species with wide physiological tolerance that grow in warmer conditions, like Palmaria decipiens, could benefit, while other species will be discriminated. More detailed studies are necessary to predict future changes in Antarctic intertidal communities. © 2016


Documento: Artículo
Título:Life between tides: Spatial and temporal variations of an intertidal macroalgal community at Potter Peninsula, South Shetland Islands, Antarctica
Autor:Marcías, M.L.; Deregibus, D.; Saravia, L.A.; Campana, G.L.; Quartino, M.L.
Filiación:Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, Pabellón 2, Buenos Aires, Buenos Aires C1428EHA, Argentina
Dirección Nacional del Antártico, Instituto Antártico Argentino, Departamento de Biología Costera, 25 de Mayo 1143, San Martin, Buenos Aires CP 1650, Argentina
Instituto de Ciencias, Universidad Nacional de General Sarmiento, J.M. Gutiérrez 1150, Los Polvorines, B1613GSX, Argentina
Departamento de Ciencias Básicas, Universidad Nacional de Luján, Ruta 5 y Avenida Constitución, Luján, Buenos Aires CP 6700, Argentina
Museo Argentino de Ciencias Naturales, B. Rivadavia. Av., A. Gallardo 470Buenos Aires C1405DJR, Argentina
Palabras clave:Aquatic communities; Benthos; Community structure; Ecological zonation; Isla 25 de Mayo/King George Island; Seaweeds; annual variation; aquatic organism; benthos; climate change; community structure; ecological zonation; environmental conditions; global climate; hypothesis testing; intertidal environment; macroalga; red alga; seaweed; spatiotemporal analysis; species diversity; species richness; Antarctica; King George Island; Potter Peninsula; South Shetland Islands; Palmaria decipiens; Rhodophyta
Página de inicio:193
Página de fin:203
Título revista:Estuarine, Coastal and Shelf Science
Título revista abreviado:Estuar. Coast. Shelf Sci.


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---------- APA ----------
Marcías, M.L., Deregibus, D., Saravia, L.A., Campana, G.L. & Quartino, M.L. (2017) . Life between tides: Spatial and temporal variations of an intertidal macroalgal community at Potter Peninsula, South Shetland Islands, Antarctica. Estuarine, Coastal and Shelf Science, 187, 193-203.
---------- CHICAGO ----------
Marcías, M.L., Deregibus, D., Saravia, L.A., Campana, G.L., Quartino, M.L. "Life between tides: Spatial and temporal variations of an intertidal macroalgal community at Potter Peninsula, South Shetland Islands, Antarctica" . Estuarine, Coastal and Shelf Science 187 (2017) : 193-203.
---------- MLA ----------
Marcías, M.L., Deregibus, D., Saravia, L.A., Campana, G.L., Quartino, M.L. "Life between tides: Spatial and temporal variations of an intertidal macroalgal community at Potter Peninsula, South Shetland Islands, Antarctica" . Estuarine, Coastal and Shelf Science, vol. 187, 2017, pp. 193-203.
---------- VANCOUVER ----------
Marcías, M.L., Deregibus, D., Saravia, L.A., Campana, G.L., Quartino, M.L. Life between tides: Spatial and temporal variations of an intertidal macroalgal community at Potter Peninsula, South Shetland Islands, Antarctica. Estuar. Coast. Shelf Sci. 2017;187:193-203.