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Aquatic Sciences

, 81:14 | Cite as

Sinkholes as a source of life in the Dead Sea region

  • Ofir Hirshberg
  • Frida Ben-AmiEmail author
Research Article

Abstract

In recent decades, the Dead Sea region has suffered greatly from anthropogenic activities that have resulted in a massive decrease of the Dead Sea water level. This decrease has allowed the penetration of fresh ground water into the underground layer, which dissolved the salt layer and created sinkholes. Presently there are over 5000 sinkholes spread across the west bank of the Dead Sea, some of which are filled with water originating from rainfall, flash floods and spring water. Although sinkholes are detrimental to road infrastructure and tourist sites, they have dramatically increased the number of aquatic habitats surrounding the Dead Sea. In a cross-sectional study of 94 sinkholes along the north-west bank of the Dead Sea, coupled with a longitudinal study of six sinkholes, we examined how the community of invertebrates in the sinkholes is affected by environmental and geographic variables and how biological succession occurs in the sinkholes. We found that sinkholes are populated mainly by aquatic insects, which have high tolerance of a variety of environmental conditions. We also found that the community of invertebrates in the sinkholes is shaped by environmental variables such as salinity, pH, dissolved oxygen concentration, water temperature and the size of the sinkhole. We further found that the geographic distance between the sinkholes increases spatial species turnover and that species turnover across time was high. Patterns of species composition were similar in all the sinkholes, with the community structure during the wet season changing from early to mid-season, and then again from mid-season to late season. Interestingly, despite the extreme conditions of the water of the sinkholes, their seasonal succession processes were similar to those of temporary water bodies along the Mediterranean coast of Israel.

Keywords

Aquatic habitats Aquatic insects Aquatic invertebrates Community ecology Extreme environments Species diversity Species richness 

Notes

Acknowledgements

We are grateful to V. Baranov, L. Blaustein, I. Blecher, V. Chikatonov, J. A. Delgado, A. Friedberg, L. Friedman, J. Martin, H. Moller-Pillot, T. Novoselsky, T. Snor and Z. Yanai for their help in taxonomic identification of some of the invertebrates. We are also grateful to C. Yule and two anonymous reviewers for valuable comments on the manuscript. We further thank E. Hazan from the Einot Tzukim nature reserve for assistance in the field, I. Gavrieli and G. Lapid from the Geological Survey of Israel for dating the sinkholes, and D. Milstein from the Israel Nature and Parks Authority for supporting us throughout the project. This study was funded by the Israel Nature and Parks Authority.

Author contributions

FBA conceived and designed the study. OH performed the research, analyzed the data and wrote the paper. FBA provided editorial advice. All authors read and approved the final manuscript.

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.School of Zoology, George S. Wise Faculty of Life SciencesTel Aviv UniversityTel AvivIsrael

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