Who eats who in biofilms? Exploring the drivers of microalgal and micro-meiofaunal abundance
| Autor: | Jacky Vedrenne, Julie Neury-Ormanni, Soizic Morin |
|---|---|
| Přispěvatelé: | Ecosystèmes aquatiques et changements globaux (UR EABX), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Irstea Publications, Migration |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
[SDE] Environmental Sciences Herbivore Biocide Ecology 010604 marine biology & hydrobiology Biofilm Plant Science 010501 environmental sciences Biology BROUTAGE 01 natural sciences Nutrient Taxon Microbial population biology 13. Climate action Abundance (ecology) [SDE]Environmental Sciences MICRO MEIOFAUNE 14. Life underwater Periphyton MICROALGUE 0105 earth and related environmental sciences |
| Zdroj: | Botany Letters Botany Letters, Taylor & Francis, 2016, 163 (2), pp.83-92. ⟨10.1080/23818107.2016.1151827⟩ 4th Biofilm Workshop 4th Biofilm Workshop, Apr 2016, Girona, Spain. pp.20 HAL |
| ISSN: | 2381-8107 2381-8115 |
| DOI: | 10.1080/23818107.2016.1151827⟩ |
| Popis: | International audience; A substantial amount of research has been dedicated to aquatic biofilms, but unlike the influence of macrograzers, that of microscopic herbivores (2 microm to 2 mm) has been largely disregarded. The selective pressure that they may exert remains unexplored, despite its potential impact on microbial community structure and ultimately, function. We performed in situ experiments to assess the abundance of microflora and micro-meiofauna in mature biofilms, in four rivers located in southwest France, stressing their quantitative importance (averaging 50% of the total number of organisms counted). We highlighted that the balance between microflora and micro-meiofauna depends on local environmental conditions, and specific taxon selection is likely to provide information on river pollution. Indeed, microalgae were directly favoured by nutrients and indirectly by biocides targeting micrograzers. In contrast, micro-meiofauna was predominant in sites where herbicides were found, in particular photosynthesis inhibitors (e.g. in the River Ponteils, 97% micro-meiofauna). Although the prey–predator relationships in the laboratory experiment appeared to depend on the initial pools of microorganisms during the first days, they reached stable states within a week. Then, all cultures stabilized around a ratio of 20 ± 6 : 1 prey/potential predator. Further research is required to better understand the abiotic (water quality, habitat) and biotic (traits of the organisms present) drivers governing the coexistence of microalgae and their predators across the microbial landscape, and its consequences on the structure and function of the aquatic ecosystem. |
| Databáze: | OpenAIRE |
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