Inland blue holes of the bahamas – chemistry and biology in a unique aquatic environment

Caroline Björnerås, Martin Škerlep*, Raphael Gollnisch, Simon David Herzog, Gustaf Ekelund Ugge, Alexander Hegg, Nan Hu, Emma Johansson, Marcus Lee, Varpu Pärssinen, Yongcui Sha, Jerker Vinterstare, Huan Zhang, Kaj Hulthén, Christer Brönmark, Lars Anders Hansson, P. Anders Nilsson, Karin Rengefors, R. Brian Langerhans

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

While lake systems in temperate regions have been extensively studied, tropical and subtropical systems have received less attention. Here, we describe the water chemistry and biota of ten inland blue holes on Andros Island, The Bahamas, representative of the morphological, abiotic, and biotic variation among Androsian inland blue holes. The majority of the studied blue holes were vertically stratified with oxic freshwater overlying anoxic saline groundwater of marine origin. Water chemistry (e.g. total phosphorus and nitrogen) in shallow waters was similar among blue holes, while turbidity and water color varied. Presence of hydrogen sulfide and reduced iron in and below the halocline indicate reducing conditions in all stratified blue holes. The biota above the halocline was also similar among blue holes with a few taxa dominating the phytoplankton community, and the zooplankton community consisting of copepods and rotifers. The Bahamas mosquitofish (Gambusia hubbsi) was present in all investigated blue holes, often accompanied by other small planktivorous fish, while the piscivorous bigmouth sleeper (Gobiomorus dormitor) was only present in some of the blue holes. Our field study reinforces that inland blue holes are highly interesting for biogeochemical research, and provide naturally replicated systems for evolutionary studies.

Original languageEnglish
JournalFundamental and Applied Limnology
Volume194
Issue number2
Pages (from-to)95-106
Number of pages12
ISSN1863-9135
DOIs
Publication statusPublished - Dec 2020
Externally publishedYes

Bibliographical note

Funding Information:
We thank the Helge Ax:son Johnsons foundation, The Royal Physiographic Society, and County Governor Per Westling Memorial Fund for financial support. We thank prof. Øjvind Moetrup, Copenhagen University, for identifying Naiadinium polonicum by scanning electron microscopy. Thanks to Sofia Mebrahtu Wisén at the Instrumental Chemistry Facility, Department of Biology, Lund University, for inorganic analyses. We are also grateful to The Bahamas government for permission to conduct the fieldwork and to Wilfred Johnson for support in the field.

Funding Information:
We thank the Helge Ax:son Johnsons foundation, The Royal Physiographic Society, and County Governor Per Westling Memorial Fund for financial support. We thank prof. ?jvind Moetrup, Copenhagen University, for identifying Naiadinium polonicum by scanning electron microscopy. Thanks to Sofia Mebrahtu Wis?n at the Instrumental Chemistry Facility, Department of Biology, Lund University, for inorganic analyses. We are also grateful to The Bahamas government for permission to conduct the fieldwork and to Wilfred Johnson for support in the field.

Publisher Copyright:
© 2020 E. The authors.

Keywords

  • Anchialine caves
  • Andros Island
  • Aquatic ecosystems
  • Halocline, sub-tropical
  • Redox biogeochemistry

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