Details zur Publikation |
Kategorie | Textpublikation |
Referenztyp | Zeitschriften |
DOI | 10.1016/j.scitotenv.2020.139331 |
Volltext | Autorenversion |
Titel (primär) | Effects of low flow and co-occurring stressors on structural and functional characteristics of the benthic biofilm in small streams |
Autor | Baattrup-Pedersen, A.; Graeber, D.; Kallestrup, H.; Guo, K.; Rasmussen, J.J.; Larsen, S.E.; Riis, T. |
Quelle | Science of the Total Environment |
Erscheinungsjahr | 2020 |
Department | ASAM |
Band/Volume | 733 |
Seite von | art. 139331 |
Sprache | englisch |
Keywords | GPP; Traits; Biomass; Nutrients; Fine sediments; Eutrophication |
Abstract | Low flow and co-occurring stress is a more and more frequent phenomenon
these years in small agricultural streams as a consequence of climate
change. In the present study we explored short and longer term
structural responses of the stream benthic algae community and biofilm
metabolism to multiple stress in small streams applying a
semi-experimental approach. We hypothesized that i) a reduction in flow
in combination with secondary stress (nutrients and sediments) have
immediate effects on the benthic algae community in terms of biomass
(chlorophyll a, biovolume), taxonomic and trait (lifeform and
size distribution) compositions as well as on metabolism (GPP and CR),
and ii) that changes in the benthic algae community persist due to
altered environmental settings but that functional redundancy among
benthic algae species provides a high level of resilience in metabolism
(GPP and CR). Overall, we found that stress imposed by nutrients was
less pronounced than stress imposed by fine sediments under low flow,
and that nutrient enrichment to some extent mitigated effects of fine
sediments. Fine sediment deposition mediated a decline in the fraction
of erect algae and/or algae with mucilage stalks but this did not happen
under co-occurring stress from both sediments and nutrients.
Additionally, fine sediment deposition mediated a decline in GPP of the
biofilm, but again this did not happen under co-occurring stress from
nutrients. We conclude that 1) the benthic algae community and biofilm
metabolism displayed similar resilience to stress imposed by low flow
and co-occurring stress from nutrients and sediments on a short and
longer time scale and 2) as structure–function adaptations may occur at
several trophic levels in the biofilm, more research is needed to
explore mechanisms underlying mitigating effects of nutrients in
response to sediment deposition under low flow. |
dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=23161 |
Baattrup-Pedersen, A., Graeber, D., Kallestrup, H., Guo, K., Rasmussen, J.J., Larsen, S.E., Riis, T. (2020): Effects of low flow and co-occurring stressors on structural and functional characteristics of the benthic biofilm in small streams Sci. Total Environ. 733 , art. 139331 10.1016/j.scitotenv.2020.139331 |