Contrasting cyanobacterial communities and microcystin concentrations in summers with extreme weather events : insights into potential effects of climate change

Wood, Susanna A.; Borges, Hugo; Puddick, Jonathan; Biessy, Laura; Atalah, Javier; Hawes, Ian; Dietrich, Daniel R.; Hamilton, David P.

Contrasting cyanobacterial communities and microcystin concentrations in summers with extreme weather events : insights into potential effects of climate change

Dateien

Wood_2-6ukgf34br2n32.pdfGröße: 717.36 KBDownloads: 783

Datum

2017

Autor:innen

Wood, Susanna A.

Borges, Hugo

Puddick, Jonathan

Biessy, Laura

Atalah, Javier

Hawes, Ian

Dietrich, Daniel R.

Hamilton, David P.

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Hydrobiologia. 2017, 785(1), pp. 71-89. ISSN 0018-8158. eISSN 1573-5117. Available under: doi: 10.1007/s10750-016-2904-6

Zusammenfassung

Current climate change scenarios predict that aquatic systems will experience increases in temperature, thermal stratification, water column stability and in some regions, greater precipitation. These factors have been associated with promoting cyanobacterial blooms. However, limited data exist on how cyanobacterial composition and toxin production will be affected. Using a shallow eutrophic lake, we investigated how precipitation intensity and extended droughts influenced: (i) physical and chemical conditions, (ii) cyanobacterial community succession, and (iii) toxin production by Microcystis. Moderate levels of nitrate related to intermittent high rainfall during the summer of 2013–2014, lead to the dominance of Aphanizomenon gracile and Dolichospermumcrassum (without heterocytes). Microcystis aeruginosa blooms occurred when ammonium concentrations and water temperature increased, and total nitrogen:total phosphorus ratios were low. In contrast, an extended drought (2014–2015 summer) resulted in prolonged stratification, increased dissolved reactive phosphorus, and low dissolved inorganic nitrogen concentrations. All A. gracile and D. crassum filaments contained heterocytes, M. aeruginosa density remained low, and the picocyanobacteria Aphanocapsa was abundant. A positive relationship (P < 0.001) was identified between microcystin quotas and surface water temperature. These results highlight the complex successional interplay of cyanobacteria species and demonstrated the importance of climate through its effect on nutrient concentrations, water temperature, and stratification.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

Aphanizomenon; Dolichospermum; Microcystis; Surface water temperature: Nitrogen; Phosphorus

Zitieren

ISO 690

WOOD, Susanna A., Hugo BORGES, Jonathan PUDDICK, Laura BIESSY, Javier ATALAH, Ian HAWES, Daniel R. DIETRICH, David P. HAMILTON, 2017. Contrasting cyanobacterial communities and microcystin concentrations in summers with extreme weather events : insights into potential effects of climate change. In: Hydrobiologia. 2017, 785(1), pp. 71-89. ISSN 0018-8158. eISSN 1573-5117. Available under: doi: 10.1007/s10750-016-2904-6

BibTex

@article{Wood2017-01Contr-38506,
  year={2017},
  doi={10.1007/s10750-016-2904-6},
  title={Contrasting cyanobacterial communities and microcystin concentrations in summers with extreme weather events : insights into potential effects of climate change},
  number={1},
  volume={785},
  issn={0018-8158},
  journal={Hydrobiologia},
  pages={71--89},
  author={Wood, Susanna A. and Borges, Hugo and Puddick, Jonathan and Biessy, Laura and Atalah, Javier and Hawes, Ian and Dietrich, Daniel R. and Hamilton, David P.}
}

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