التفاصيل البيبلوغرافية
| العنوان: |
Effects of Macrofaunal Recolonization on Biogeochemical Processes and Microbiota—A Mesocosm Study |
| المؤلفون: |
Annika Fiskal, Aixala Gaillard, Sebastien Giroud, Dejan Malcic, Prachi Joshi, Michael Sander, Carsten J. Schubert, Mark Alexander Lever |
| المصدر: |
Water; Volume 13; Issue 11; Pages: 1599 |
| بيانات النشر: |
Multidisciplinary Digital Publishing Institute |
| سنة النشر: |
2021 |
| المجموعة: |
MDPI Open Access Publishing |
| مصطلحات موضوعية: |
bioturbation, ventilation, bioirrigation, reworking, microbial community, sediment biogeochemistry, temperate lake sediment, eutrophication, oligotrophication |
| جغرافية الموضوع: |
agris |
| الوصف: |
Macroinvertebrates are widespread in lake sediments and alter sedimentary properties through their activity (bioturbation). Understanding the interactions between bioturbation and sediment properties is important given that lakes are important sinks and sources of carbon and nutrients. We studied the biogeochemical impact of macrofauna on surface sediments in 3-month-long mesocosm experiments conducted using sediment cores from a hypoxic, macrofauna-free lake basin. Experimental units consisted of hypoxic controls, oxic treatments, and oxic treatments that were experimentally colonized with chironomid larvae or tubificid worms. Overall, the presence of O2 in bottom water had the strongest geochemical effect and led to oxidation of sediments down to 2 cm depth. Relative to macrofauna-free oxic treatments, chironomid larvae increased sediment pore water concentrations of nitrate and sulfate and lowered porewater concentrations of reduced metals (Fe2+, Mn2+), presumably by burrow ventilation, whereas tubificid worms increased the redox potential, possibly through sediment reworking. Microbial communities were very similar across oxic treatments; however, the fractions of α-, β-, and γ-Proteobacteria and Sphingobacteriia increased, whereas those of Actinobacteria, Planctomycetes, and Omnitrophica decreased compared to hypoxic controls. Sediment microbial communities were, moreover, distinct from those of macrofaunal tubes or feces. We suggest that, under the conditions studied, bottom water oxygenation has a stronger biogeochemical impact on lacustrine surface sediments than macrofaunal bioturbation. |
| نوع الوثيقة: |
text |
| وصف الملف: |
application/pdf |
| اللغة: |
English |
| Relation: |
Water Quality and Contamination; https://dx.doi.org/10.3390/w13111599 |
| DOI: |
10.3390/w13111599 |
| الاتاحة: |
https://doi.org/10.3390/w13111599 |
| Rights: |
https://creativecommons.org/licenses/by/4.0/ |
| رقم الانضمام: |
edsbas.262F1097 |
| قاعدة البيانات: |
BASE |