Macrophyte detritus is one of the main sources of organic carbon (OC) in inland waters, and it is potentially available for methane (CH) production in anoxic bottom waters and sediments. However, the transformation of macrophyte-derived OC into CH has not been studied systematically, thus its extent and relationship with macrophyte characteristics remains uncertain. We performed decomposition experiments of macrophyte detritus from 10 different species at anoxic conditions, in presence and absence of a freshwater sediment, in order to relate the extent and rate of CH production to the detritus water content, C/N and C/P ratios. A significant fraction of the macrophyte OC was transformed to CH (mean = 7.9%; range = 0-15.0%) during the 59-d incubation, and the mean total C loss to CO and CH was 17.3% (range = 1.3-32.7%). The transformation efficiency of macrophyte OC to CH was significantly and positively related to the macrophyte water content, and negatively to its C/N and C/P ratios. The presence of sediment increased the transformation efficiency to CH from an average of 4.0% (without sediment) to 11.8%, possibly due to physicochemical conditions favorable for CH production (low redox potential, buffered pH) or because sediment particles facilitate biofilm formation. The relationship between macrophyte characteristics and CH production can be used by future studies to model CH emission in systems colonized by macrophytes. Furthermore, this study highlights that the extent to which macrophyte detritus is mixed with sediment also affects CH production.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6774319 | PMC |
| http://dx.doi.org/10.1002/lno.11148 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Interaction Between Climate Change Scenarios and Biological Invasion Reveals Complex Cascading Effects in Freshwater Ecosystems.
Glob Chang Biol
October 2024
Laboratório de Ecologia e Conservação de Ecossistemas, Departamento de Ecologia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
Climate change often facilitates biological invasions, leading to potential interactive impacts of these global drivers on freshwater ecosystems. Although climatic mitigation efforts may reduce the magnitude of these interactive impacts, we are still missing experimental evidence for such effects under multiple climate change scenarios within a multi-trophic framework. To address this knowledge gap, we experimentally compared the independent and interactive effects of two climate change scenarios (mitigation and business-as-usual) and biological invasion on the biomass of major freshwater trophic groups (phytoplankton, zooplankton, periphyton, macroinvertebrates, and a native macrophyte) and the decomposition rate of allochthonous material.
View Article and Find Full Text PDFLateral carbon export of macroalgae and seagrass from diverse habitats contributes particulate organic carbon in the deep sea of the Northern South China Sea.
Mar Pollut Bull
September 2024
Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 80424, Taiwan. Electronic address:
Our study explored the lateral export of macroalgae and seagrass to the deep sea of the Northern South China Sea (NSCS). Particulate organic carbon (POC) collected from a depth of 500 m off southwestern Taiwan (station T) and Dongsha Atoll (station K) underwent environmental DNA (eDNA) and stable isotope assays. Metabarcoding using 18S V9 rDNA revealed lateral export of macrophyte detritus in NSCS.
View Article and Find Full Text PDFFood web collapse and regime shift following goldfish introduction in permanent ponds.
Glob Chang Biol
July 2024
Laboratory of Ecology and Conservation of Amphibians (LECA), Freshwater and OCeanic Science Unit of reSearch (FOCUS), University of Liège, Liège, Belgium.
In a global context of invasive alien species (IAS), native predators are often eradicated by functionally different IAS, which may induce complex cascading consequences on ecosystem functioning because of the key role predators play in structuring communities and stabilizing food webs. In permanent ponds, the most abundant freshwater systems on Earth, global human-mediated introductions of alien omnivores such as the pet trade goldfish are driving broad-scale patterns of native predators' exclusion, but cascading consequences on food web structure and functioning are critically understudied. We compared food webs of naturally fishless ponds versus ponds where dominant native predators (newts) had been extirpated by invasive goldfish within the last decade.
View Article and Find Full Text PDFEffects of multiple stressors on freshwater food webs: Evidence from a mesocosm experiment.
Environ Pollut
May 2024
Key Laboratory of Lake and Watershed Science for Water Security, Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China. Electronic address:
Article Synopsis
- Natural and human-induced pressures impact aquatic ecosystems by altering organism behavior and trophic interactions, which is crucial for effective ecosystem management.
- A mesocosm experiment was conducted to study the effects of combined stressors like nutrient loading and herbicide exposure on freshwater food webs, involving various species and conditions to simulate real-world scenarios.
- Results showed that multiple stressors have complex, antagonistic effects on species interactions, leading to shifts in feeding behavior in top predators and emphasizing that combined stressors are often more harmful than individual ones.
CiguaMOD I: A conceptual model of ciguatoxin loading in the Greater Caribbean Region.
Harmful Algae
January 2024
School of Marine and Environmental Sciences, University of South Alabama, Mobile, AL 36688, USA; Dauphin Island Sea Lab, Dauphin Island, AL 36528, USA.
Article Synopsis
- Ciguatera poisoning (CP) is a widespread seafood poisoning caused by ciguatoxins (CTXs) from dinoflagellates consumed by reef fish, impacting thousands annually.
- Several challenges hinder effective monitoring and surveillance of CP, including the low concentration of toxins in seafood, limited knowledge on their toxicity, and a shortage of standard reference materials.
- A new conceptual model suggests effective monitoring strategies by focusing on specific macrophytes for toxin measurement and adapting these strategies seasonally and regionally, potentially creating an "early warning" system for CP outbreaks.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!