Can salinity trigger cascade effects on streams? A mesocosm approach
| العنوان: | Can salinity trigger cascade effects on streams? A mesocosm approach |
|---|---|
| المؤلفون: | Amadeu M.V.M. Soares, Gabriela Peixoto, Carlos Barata, Ben J. Kefford, Miquel Sala, Melissa Faria, Miguel Cañedo-Argüelles, Narcís Prat |
| المساهمون: | Universitat de Vic - Universitat Central de Catalunya. Centre Tecnològic BETA |
| المصدر: | RIUVic. Repositorio Institucional de la Universidad de Vic instname |
| بيانات النشر: | Elsevier, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Chlorophyll, 0106 biological sciences, Salinity, Food Chain, Environmental Engineering, River ecosystem, Soil salinity, Cascade effect (ecology), 010501 environmental sciences, Biology, 01 natural sciences, Mesocosm, Rivers, Depredació (Biologia), Animals, Environmental Chemistry, Waste Management and Disposal, Ecosystem, 0105 earth and related environmental sciences, Trophic level, Invertebrats aquàtics, Ecology, Chlorophyll A, 010604 marine biology & hydrobiology, Water Pollution, Aigua -- Salinització, Invertebrates, Pollution, Food web, Species richness, Environmental Monitoring |
| الوصف: | Human activities have greatly increased the salt concentration of the world's rivers, and this might be amplified by water scarcity in the future. While the lethal effects of salinity have been documented for a wide variety of stream invertebrates, the sub-lethal effects (i.e. changes in biological conditionwithout mortality) are not deeply understood yet. One important sub-lethal effect that has yet to be investigated is changes in predation efficiency, which could trigger cascade effects associated to the abundance of herbivorous invertebrates that control algae biomass. In this study we combined the use of biomarkers with community-level data in a stream mesocosm to evaluate the potential cascade effect of increased salinity on the trophic food web. Both predation and salt treatments had an effect on the aquatic invertebrate abundance, richness and community composition. The presence of predators had a clear cascade effect, it reduced herbivorous invertebrate abundance and richness leading to higher chlorophyll a concentrations. The salt treatment significantly reduced taxa richness, but only in the gravel bed. The predators were significantly stressed by salt addition, as shown by the different analyzed biomarkers. Concordantly, in the presence of predators, Tanytarsini registered higher abundances and chlorophyll a showed a lower concentration when salt was added. However, none of these changes was significant. Therefore, although salt addition significantly stressed Dina lineata, our results suggest that a longer exposure time is needed to fully capture cascading effects (e.g. a decrease in chlorophyll a due to a relaxation of predation on herbivorous invertebrates).We suggest that the potential cascade effects of salinization need to be evaluated when addressing the impacts of water scarcity (as caused by climate change and increasing water demand) on river ecosystems, since flow reductions will lead to higher salt concentrations. |
| وصف الملف: | application/pdf |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d54bc8ea665f18e4930224adf20fe3f3Test http://hdl.handle.net/10854/4344Test |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....d54bc8ea665f18e4930224adf20fe3f3 |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |