Maximum salinity tolerance of the gastropod Pyrgophorus platyrachis (Littorinimorpha: Cochliopidae) at Peonias Lagoon, Maracaibo System, Venezuela
DOI:
https://doi.org/10.53157/ecotropicos.30e0004Keywords:
Estuarine environments, Lethal concentration, Limiting factors, ToxicityAbstract
The distribution and population dynamics of the Pyrgophorus platyrachis (a widely distributed species in the Maracaibo System) could be affected by changes in salinity concentrations in future global change scenarios, as consequence of sea level increases. Therefore, we aimed to determine, in laboratory conditions, the maximum tolerance to salinity changes that individuals of P. platyrachis from the Las Peonias Lagoon (Zulia state-Venezuela) can endure. In order to calculate the mortality and activity of the snail individuals, two experiments were carried out: in the first one, the salinity was progressively increased(3 ± 2 PSU [Practical Salinity Unit]) every 48 h during 46 days; while in the second experiment, we studied the effect of sudden changes of salt concentrations (14, 28, and 56 PSU) during 72h. For both experiments, we used a control treatment at concentration 7 PSU. We observed a clear tendency to decrease the activity of organisms at higher salt concentration values. The results showed that P. platyrachis individuals originally from the Peonias Lagoon are capable to tolerate a progressive salinity increase, with a Lethal Concentration (LC50) at 88 PSU; while for sudden increases in salinity the LC50 was estimated at 42PSU.
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Copyright (c) 2018 Mario Lester Nava Ferrer, César López, Dayrana Carolina Mora Hernández, Guillermo Pares, José M. Manzano Marcano, Moisés S. Macías Serpa, Roxana Sánchez (Author)
This work is licensed under a Creative Commons Attribution 4.0 International License.
