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Resilience of an isopod population (Cyathura carinata) to multiple stress factors in a temperate estuarine system

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Abstract

The Mondego Estuary (Portugal) underwent major modifications in the late 1980s, because of eutrophication, for which it was developed a restoration programme that has been effective in recovering seagrass beds. Recently, this system has been affected by successive weather extremes: floods, droughts, and heat waves. The effect of these multiple stressors on a Cyathura carinata (Isopoda) population has been evaluated, through a long-term data series (16 years) in a seagrass bed, an intermediate area, and a sand flat. A well age-structured and abundant population of C. carinata was observed in the sand flat, in contrast with the seagrass bed and intermediate area. After introducing the restoration measures, C. carinata’s abundance increased even in the stations where it was formerly scarce. This recovery was compromised by successive extreme events. C. carinata declined severely in terms of total abundance and growth production during the 2003 summer heat wave, at the sand flat, also endangering its reproductive success. Floods and droughts affected dispersion of the individuals, which was reflected in the population’s density and production. Nevertheless, this isopod had great resilience, recovering successfully after disturbances. In contrast, the population of C. carinata had less resilience in the seagrass bed and intermediate area, being unable to recover after a succession of disturbances, which may threaten the success of this species in the system. Because the frequency and intensity of weather extremes are expected to continue to increase in a scenario of global climate change, their repercussions will affect such populations, which will have difficulty surviving. This will have severe implications on the functioning of the whole ecosystem.

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Acknowledgments

This work was supported by FCT (Portuguese Foundation for Science and Technology) through a PhD grant awarded to M.D. Bordalo (SFRH/BD/42320/2007). The authors are indebted to all the colleagues that helped in the field and laboratory work.

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Authors and Affiliations

  1. CFE – Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Apartado 3046, 3001-401, Coimbra, Portugal

    M. D. Bordalo, S. M. F. Ferreira, S. Leston & M. A. Pardal

  2. IMAR-CMA – Marine and Environmental Research Centre, Department of Life Sciences, University of Coimbra, Apartado 3046, 3001-401, Coimbra, Portugal

    P. G. Cardoso

  3. GIRM – Marine Resources Research Group, School of Tourism and Maritime Technology, Polytechnic Institute of Leiria, 2524-909, Peniche, Portugal

    S. M. F. Ferreira

Authors
  1. M. D. Bordalo
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  2. S. M. F. Ferreira
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  3. P. G. Cardoso
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  4. S. Leston
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  5. M. A. Pardal
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Correspondence to M. D. Bordalo.

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Handling editor: Pierluigi Viaroli

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Bordalo, M.D., Ferreira, S.M.F., Cardoso, P.G. et al. Resilience of an isopod population (Cyathura carinata) to multiple stress factors in a temperate estuarine system. Hydrobiologia 671, 13–25 (2011). https://doi.org/10.1007/s10750-011-0700-x

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  • DOI: https://doi.org/10.1007/s10750-011-0700-x

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