Mass mortality event in a small saline lake (Lake Rogoznica) caused by unusual holomictic conditions
DOI:
https://doi.org/10.3989/scimar.2003.67n2129Keywords:
saline lake, mass mortality, nutrient regeneration, phytoplankton, benthic communitiesAbstract
The study of a small saline eutrophic lake was performed under meromictic and holomictic conditions. The meromictic period was characterised by anoxic conditions in the bottom layer with high sulphide and nutrient concentrations. The depth of the nutricline varied as affected by thermohaline conditions in the water column. In late summer 1997, holomictic conditions replaced ordinary meromitic conditions in the lake. This transformation caused anoxia to spread throughout the water column and mass mortality of almost all the organisms occured. Thereafter, oxic conditions were re-established slowly as the new phytoplankton population developed. As a consequence of the particulate organic matter decay, inorganic N and P concentrations increased and had doubled approximately six weeks after the mass mortality. The revitalisation of the phytoplankton population was initiated immediately after the mass mortality by the development of "microflagellate" species, which were favoured by the high ammonia concentrations. The larger phytoplankton species (diatoms and dinoflagellatae) developed at the expense of smaller ones when nitrate became the dominant nutrient in the water column. A year after the mass mortality the composition of the phytoplankton population was the same as before.
Downloads
Download data is not yet available.
Downloads
Published
2003-06-30
How to Cite
1.
Baric A, Grbec B, Kuspilic G, Marasovic I, Nincevic Z, Grubelic I. Mass mortality event in a small saline lake (Lake Rogoznica) caused by unusual holomictic conditions. scimar [Internet]. 2003Jun.30 [cited 2023Dec.3];67(2):129-41. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/462
Issue
Section
Articles
License
Copyright (c) 2003 Consejo Superior de Investigaciones Científicas (CSIC)

This work is licensed under a Creative Commons Attribution 4.0 International License.
© CSIC. Manuscripts published in both the printed and online versions of this Journal are the property of Consejo Superior de Investigaciones Científicas, and quoting this source is a requirement for any partial or full reproduction.All contents of this electronic edition, except where otherwise noted, are distributed under a “Creative Commons Attribution 4.0 International” (CC BY 4.0) License. You may read here the basic information and the legal text of the license. The indication of the CC BY 4.0 License must be expressly stated in this way when necessary.
Self-archiving in repositories, personal webpages or similar, of any version other than the published by the Editor, is not allowed.