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Long-term responses of sandy beach crustaceans to the effects of coastal armouring after the 2010 Maule earthquake in South Central Chile
Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre. University of Porto, Portugal; University of Helsinki, Finland.
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Number of Authors: 5
2016 (English)In: Journal of Sea Research, ISSN 1385-1101, E-ISSN 1873-1414, Vol. 108, 10-18 p.Article in journal (Refereed) Published
Abstract [en]

Earthquakes and tsunamis are large physical disturbances frequently striking the coast of Chile with dramatic effects on intertidal habitats. Armouring structures built as societal responses to beach erosion and shoreline retreat are also responsible of coastal squeeze and habitat loss. The ecological implications of interactions between coastal armouring and earthquakes have recently started to be studied for beach ecosystems. How long interactive impacts persist is still unclear because monitoring after disturbance generally extends for a few months. During five years after the Maule earthquake (South Central Chile, February 27th 2010) we monitored the variability in population abundances of the most common crustacean inhabitants of different beach zones (i.e. upper, medium, and lower intertidal) at two armoured (one concrete seawall and one rocky revetment) and one unarmoured sites along the sandy beach of Llico. Beach morphology changed after the earthquake-mediated uplift, restoring upper-and mid-shore armoured levels that were rapidly colonized by typical crustacean species. However, post-earthquake increasing human activities affected the colonization process of sandy beach crustaceans in front of the seawall. Lower-shore crab Emerita analoga was the less affected by armouring structures, and it was the only crustacean species present at the three sites before and after the earthquake. This study shows that field sampling carried out promptly after major disturbances, and monitoring of the affected sites long after the disturbance is gone are effective approaches to increase the knowledge on the interactive effects of large-scale natural phenomena and artificial defences on beach ecology.

Place, publisher, year, edition, pages
2016. Vol. 108, 10-18 p.
Keyword [en]
Sandy beaches, Crustaceans, Seawall, Revetment, Chile, Coseismic uplift, Tsunami
National Category
Biological Sciences Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-130659DOI: 10.1016/j.seares.2015.12.007ISI: 000374607800002OAI: oai:DiVA.org:su-130659DiVA: diva2:932288
Available from: 2016-06-01 Created: 2016-05-27 Last updated: 2016-06-01Bibliographically approved

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