RT Conference Proceedings
T1 Temporal variability of Oscillatoria sp. in extreme environment: a sulfide-rich spring outflow
A1 Reul, Andreas
A1 Martín-Clemente, Elena
A1 Melero-Jiménez, Ignacio José
A1 Hernández-López, Miguel
A1 Toro-Gil, Francisco Javier
A1 Bañares-España, Elena
A1 Flores-Moya, Antonio
A1 García-Sánchez, María Jesús
K1 Fitoplancton
AB Backgrounds The Hedionda Spa (Andalucía, southern Spain) is a sulfide-rich spring outflow, but despite the inhibitory effect of sulfide on photosynthesis, a phytoplankton community inhabits this extreme environment.Objectives To analize the phytoplanktonic groups present in La Hedionda Spa along an annual cycle, and to study the possible correlation between sulphide concentration and the presence of different groups.Methods A monthly and weekly sampling was started on March 2016. Samples were analyzed with a fluorospectrometer to detect the presence of different groups. A FlowCAM analysis of photoplankton was carried out at 5-100 μm ESD to determine biovolume and abundance. Water samples were analized to determine sulphide concentration. Conclusions Sulphide concentrations varied from 0.8 to 219.4 μM, while chlorophyll a  ranged between 0.4 and 11.7 ug l-1. Cyanobacteria is the predominant phytoplanktonic group, accounting for 50-90% of total chlorophyll.  Oscillatoria sp. is the predominant cyanobacteria in terms of abundance (0.55-65.6 filamemts·ml-1) and biovolume (9·105-3·108 μm3 ml-1).  A positive correlation was found between sulphide concentration and Oscillatoria sp. abundance, but not between sulphide and total chlorophyll a concentration. The positive correlation could be due to (i) dilution of both sulphide and Oscillatoria sp. abundance by runoff, or (ii) to a physiological advantage of Oscillatoria sp. under elevate sulphide, which has been confirmed in laboratory experiments. However, high sulphide might also reduce  Oscillatoria sp. growth rate,  but the absence of potential predator or competitor provides Oscilatoria sp. an advantage in the environment not detectable in laboratory approaches.
YR 2017
FD 2017-09-13
LK http://hdl.handle.net/10630/14463
UL http://hdl.handle.net/10630/14463
LA eng
NO Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.Spanish Ministry of Science and Innovation through CGL2014-53682-P project.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026