2026-04-17T15:01:22Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2242562025-12-05T01:48:56Zcom_2072_1057col_2072_478778col_2072_478917

urn:hdl:2445/224256 An experimental study to assess resistance and resilience strategies of freshwater diatoms to cope with drying in Mediterranean temporary rivers Quevedo Ortiz, Guillermo Fernández Calero, José María Cañedo-Argüelles, Miguel Schiller Calle, Daniel von Fortuño Estrada, Pau Bonada i Caparrós, Núria Gomà Martínez, Joan Algues d'aigua dolça Ecologia fluvial Freshwater algae Stream ecology Temporary rivers are aquatic ecosystems that alternate periods of water flow with dry periods. Diatoms are a group of unicellular microalgae with a high colonizing ability, but little is known about their responses to drying. We carried out different resist- ance and resilience experiments to evaluate temporal and spatial dispersal capacity of diatoms during the dry period. The resistance was tested experimen- tally by rehydrating dried biofilms and sediments from temporary rivers, whereas resilience was tested by installing artificial mesocosms along a dry river section. Disconnected pools were also sampled to evaluate their propagule emission capacity. In turn, dogs from the area were sampled to test potential zoochory dispersal capacity. In the resistance experi- ment, we found living diatoms in all the rehydrated sediments but not in biofilms. Diatoms with mobility traits, high ecological plasticity, and resistance spores presented high, along with typical soil diatoms. In the resilience experiment, all mesocosms hosted liv- ing diatoms, which were low-profile, pioneering, and small species. Diatoms found in the mesocosms were also common in the disconnected pools, underscoring the potential role of the latter as a propagule emission zone. Dogs’ paws also had living diatoms, which evi- dences that wild fauna could potentially act as passive diatom vectors. 2025-11-10T18:48:32Z 2025-11-10T18:48:32Z 2024-06-01 2025-11-10T18:48:32Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/https://doi.org/10.1007/s10750-024-05585-4 Hydrobiologia, 2024 https://doi.org/10.1007/s10750-024-05585-4 cc-by (c) Quevedo Ortiz, Guillermo et al., 2024 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Springer Verlag Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)