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Landscape-driven environmental variability largely determines abiotic characteristics and phytoplankton patterns in peat bog pools (Tierra del Fuego, Argentina)

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Abstract

Ombrotrophic peat bogs from Tierra del Fuego are characteristically raised, dome-shaped, fed by precipitation, and nutrient-poor. Their landscape pattern consists of a Sphagnum magellanicum matrix encompassing pools with different morphometric and trophic features. Within the framework of a 2-year limnological survey in five pools from Rancho Hambre peat bog, we analyzed phytoplankton communities under the hypothesis that taxonomic composition would show a spatial pattern driven by ultimately landscape-controlled environmental features such as pH and trophic status, while temperature and weather-dependent features would account for seasonal changes in abundance and structure. Among the 305 taxa recorded, most were Conjugatophyceae and Bacillariophyceae, and were strongly associated to circumneutral pH and minerotrophic conditions, though limited superficial connectivity among pools accounted for dissimilar taxonomic compositions. Despite such differences, phytoplankton of pools with similar morphometry and trophic status showed similar dominant and richest taxonomic groups undergoing paralell changes over time. Seasonal temperature fluctuations were modulated by pool size and modified not only abiotic properties but also phytoplankton abundance, with different taxa showing strong summer peaks in different pools. An interpretative model is proposed which will be tested as a tool for predicting community strategy and temporal variation patterns as responses to different environmental templates.

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Acknowledgments

We are grateful to the Secretaría de Desarrollo Sustentable y Ambiente, Dirección General de Recursos Hídricos, Provincia de Tierra del Fuego and the Centro Austral de Investigaciones Científicas (CADIC)-CONICET for much valued logistical support. A major limnological project involving this research was financed by the Agencia Nacional de Investigaciones Científicas y Tecnológicas (ANPCyT) through research Grant PICT 2006–1697. Thanks are due to all researchers who took part in sampling campaigns: Rodolfo Iturraspe, Sergio Camargo, Cristina Marinone, Silvina Menu Marque, Gabriela Küppers, M. Victoria Quiroga, Rubén Lombardo, Fernando Unrein, Carlos Vélez, Guillermo Tell and Adrián Rua. Comments on the original MS by Dr. M. Victoria Quiroga and two anonymous referees were much appreciated.

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Authors and Affiliations

  1. Instituto de Investigación e Ingeniería Ambiental (3iA), Universidad Nacional de San Martín, San Martín, Prov. de Buenos Aires, Argentina

    Gabriela Mataloni & Gabriela González Garraza

  2. Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Buenos Aires, Argentina

    Gabriela Mataloni & Gabriela González Garraza

  3. Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires – IEGEBA (CONICET-UBA), 1428, Buenos Aires, Argentina

    Alicia Vinocur

  4. Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428, Buenos Aires, Argentina

    Alicia Vinocur

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  1. Gabriela Mataloni
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  2. Gabriela González Garraza
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  3. Alicia Vinocur
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Correspondence to Gabriela Mataloni.

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Mataloni, G., González Garraza, G. & Vinocur, A. Landscape-driven environmental variability largely determines abiotic characteristics and phytoplankton patterns in peat bog pools (Tierra del Fuego, Argentina). Hydrobiologia 751, 105–125 (2015). https://doi.org/10.1007/s10750-015-2175-7

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