The effects of dissolved organic matter from a native and an invasive plant species on juvenile Daphnia survival and growth

2020 ◽  
Vol 42 (4) ◽  
pp. 453-456
Author(s):  
Keiko W Wilkins ◽  
Erin Overholt ◽  
Craig Williamson
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Invasive Plant ◽  
Aquatic Organisms ◽  
Secondary Compounds ◽  
Red Maple ◽  
Negative Effects ◽  
Survival And Growth ◽  
Presence And Absence

Abstract Shifts in the composition of terrestrial plant communities could have significant effects on freshwater zooplankton due to changes in the quality of inputs of terrestrially derived dissolved organic matter (DOM). Leachate from native red maple (RM) and invasive Amur honeysuckle (AH) were used to explore the effects of DOM source on survival and growth of juvenile Daphnia ambigua. Prior research with both terrestrial and aquatic organisms indicates that AH-derived DOM has negative effects. Comparing bioassays in the presence and absence of algae with no additional DOM, RM- or AH-derived DOM, RM had stronger negative effects on both Daphnia survival and growth while AH only decreased growth. The negative effects seen in the presence and absence of algae provided evidence for both indirect and direct effects due to phytotoxicity and plant secondary compounds, respectively. DOM source may play a key role in regulating consumers in aquatic ecosystems.

Invasive plant-derived dissolved organic matter alters microbial communities and carbon cycling in soils

2021 ◽  
pp. 108191
Author(s):  
Morgan Luce McLeod ◽  
Lorinda Bullington ◽  
Cory C. Cleveland ◽  
Johannes Rousk ◽  
Ylva Lekberg
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Microbial Communities ◽  
Carbon Cycling ◽  
Invasive Plant

Facilitated Heterogeneous Photodegradation of Dissolved Organic Matter by Particulate Iron

2004 ◽  
Vol 1 (3) ◽  
pp. 197 ◽  
Author(s):  
Julia A. Howitt ◽  
Darren S. Baldwin ◽  
Gavin N. Rees ◽  
Barry T. Hart
Keyword(s):  
Organic Matter ◽  
Iron Oxide ◽  
Dissolved Organic Matter ◽  
Iron Oxides ◽  
Aquatic Ecosystems ◽  
Photochemical Reactions ◽  
Freshwater Systems ◽  
Particulate Iron ◽  
Presence And Absence ◽  
Australian Freshwater

Environmental Context. Iron oxides, as suspended minerals or as a colloidal phase, are common in Australian freshwater systems. Freshwater systems are also loaded with carbon-based substances, ‘dissolved organic matter’, but not all is biologically available as food to freshwater organisms. However, photochemical interactions between these iron oxides and dissolved organic matter provide a mechanism for biologically resistant carbon to re-enter the food web. Suspended iron oxides thus need to be considered in carbon cycles in aquatic ecosystems. Abstract. The photochemical degradation of dissolved organic matter (DOM) derived from the leaves of River Red Gum (Eucalyptus camaldulensis) was examined, with a particular focus on the photochemical generation of CO2, consumption of O2, and the effect of particulate iron minerals on these photochemical reactions. Solutions of leaf leachate were irradiated with ultraviolet and visible light in the presence and absence of amorphous iron oxides. Addition of fresh iron oxide was found to increase the rate of photodegradation of the organic matter by up to an order of magnitude compared to the reactions without added iron oxide. The ratio of CO2 produced to O2 consumed was ~1:1 in both the presence and absence of iron oxyhydroxide. The reactivity of the iron oxides was dependent on the preparation method and decreased with increased storage time. These results suggest that photochemical reactions on particle surfaces should be considered when examining carbon transformation in aquatic ecosystems, especially at sites with potential for the production of iron oxyhydroxides.

scholarly journals Dissolved Organic Matter Enhances Transport of PAHs to Aquatic Organisms

2009 ◽  
Vol 43 (23) ◽  
pp. 9044-9044 ◽  
Author(s):  
Thomas L. ter Laak ◽  
Martin A. ter Bekke ◽  
Joop L. M. Hermens
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Aquatic Organisms

Transport and transformation of dissolved organic matter in the Neuse River estuarine system, NC, USA, following Hurricane Irene (2011)

2016 ◽  
Vol 67 (9) ◽  
pp. 1313 ◽  
Author(s):  
Richard L. Miller ◽  
Matthew M. Brown ◽  
Ryan P. Mulligan
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Estuarine System ◽  
Spectral Parameters ◽  
Visible Absorption ◽  
Neuse River ◽  
Hurricane Irene ◽  
Rain Events ◽  
River Estuarine

Rivers are major conduits for the transport of allochthonous dissolved organic matter (DOM) to the ocean in coupled land–coastal systems. DOM can regulate biogeochemical processes and affect water quality, depending on the concentration and quality of DOM. By using spectral parameters calculated from chromophoric dissolved organic matter (CDOM) ultraviolet-visible absorption spectra, along with dissolved organic carbon (DOC) concentrations, we examined the input and change in the amount and quality of DOM in surface waters of the lower Neuse River and upper–middle regions of the Neuse Estuary following a major rainfall (30cm in 1 day) associated with Hurricane Irene (2011). CDOM and DOC nearly tripled in the 3 days following the storm. Although a strong linear relationship was observed between DOC and CDOM absorption coefficient at 350nm (R2=0.85), a higher fraction of non-chromophoric DOC to CDOM was observed during the rising river discharge. The spectral slope at 275–295nm and the slope ratio (275–295:350–400nm) indicated a shift from higher to lower molecular-weight DOM as it transited through the estuary, probably as a result of photodegradation. The present study demonstrated the utility of using CDOM spectral parameters for examining the flux and transformation of DOM in coastal waters following major rain events.

scholarly journals The quality of dissolved organic matter extracted at different times from pig compost and its copper binding capacity based on EEM-PARAFAC

2021 ◽  
Vol 207 ◽  
pp. 111545
Author(s):  
Xinxin Li ◽  
Zuliang Shi ◽  
Jiuchen Wang ◽  
Rongfeng Jiang
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Binding Capacity ◽  
Copper Binding

Temporal dynamics of dissolved combined neutral sugars and the quality of dissolved organic matter in the Northwestern Sargasso Sea

2009 ◽  
Vol 56 (5) ◽  
pp. 672-685 ◽  
Author(s):  
Stuart J. Goldberg ◽  
Craig A. Carlson ◽  
Dennis A. Hansell ◽  
Norm B. Nelson ◽  
David A. Siegel
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Temporal Dynamics ◽  
Sargasso Sea ◽  
Neutral Sugars

Composition, structural characteristics and indication of water quality of dissolved organic matter in Dongting Lake sediments

2016 ◽  
Vol 97 ◽  
pp. 370-380 ◽  
Author(s):  
Yanping Li ◽  
Li Zhang ◽  
Shengrui Wang ◽  
Haichao Zhao ◽  
Rui Zhang
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Lake Sediments ◽  
Structural Characteristics ◽  
Dongting Lake

The quantity and quality of dissolved organic matter as supplementary carbon source impacts the pesticide-degrading activity of a triple-species bacterial biofilm

2013 ◽  
Vol 98 (2) ◽  
pp. 931-943 ◽  
Author(s):  
Benjamin Horemans ◽  
Johanna Vandermaesen ◽  
Philip Breugelmans ◽  
Johan Hofkens ◽  
Erik Smolders ◽  
...  
Keyword(s):  
Organic Matter ◽  
Carbon Source ◽  
Dissolved Organic Matter ◽  
Bacterial Biofilm

Effects of the presence and absence of various fractions of dissolved organic matter on the toxicity of fenvalerate toDaphnia magna

1993 ◽  
Vol 12 (1) ◽  
pp. 167-176 ◽  
Author(s):  
Valerie A. Hodge ◽  
Gary T. Fan ◽  
Keith R. Solomon ◽  
Narinder K. Kaushik ◽  
Gary G. Leppard ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Presence And Absence

scholarly journals PRE AND POST-MONSOON QUALITY OF DISSOLVED ORGANIC MATTER IN HIGH ARSENIC SITES IN WEST BENGAL, INDIA

2016 ◽  
Author(s):  
Harshad Kulkarni ◽  
◽  
Natalie Mladenov ◽  
Debashis Chatterjee ◽  
Saugata Datta
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
West Bengal ◽  
Post Monsoon ◽  
High Arsenic
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