Effect of light on particulate and dissolved organic matter production of native and exotic macrophyte species in Patagonia

Cuassolo, Florencia; Navarro, Marcela Bastidas; Balseiro, Esteban; Modenutti, Beatriz

doi:10.1007/s10750-015-2434-7

Cited by 27 publications

(12 citation statements)

References 74 publications

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“…A particularly important finding of the present study is the recorded decrease in nitrates over time, which could have been due to immobilization by the biofilm growing on the decomposing leaves, and this could explain an increase in total N within the leaves at the end of the experiment. In other studies, Cuassolo et al [45] observed that the dissolved organic matter produced by the exotic species showed a low photoreactivity, and had more color than that produced by the native species similar our observations. Whereas, MacKenzie et al [46] highlighted that the initial tannin content, leaf C:N and toughness were important intrinsic factors inhibiting leaf breakdown and fungal colonization, which might explain the low breakdown or decomposition rates of P. guajava and T. sericia.…”

Section: Discussionsupporting

confidence: 91%

Nutrient Release Dynamics Associated with Native and Invasive Leaf Litter Decomposition: A Mesocosm Experiment

Mutshekwa

Cuthbert

Wasserman

et al. 2020

Water

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Leaf litter contributes to the functioning of aquatic ecosystems through allochthonous inputs of carbon, nitrogen, and other elements. Here, we examine leaf litter nutrient inputs and decomposition associated with four plant species using a mesocosm approach. Native sycamore fig Ficus sycomorus L., and silver cluster–leaf Terminalia sericea Burch. ex DC. decomposition dynamics were compared to invasive tickberry Lantana camara L. and guava Psidium guajava L., whereby phosphate, nitrate, nitrite, silicate, and ammonium releases were quantified over time. Leaf inputs significantly reduced pH, with reductions most marked by invasive L. camara. Conductivity was heightened by all leaf input treatments, except native T. sericea. Leaf inputs significantly affected all nutrient levels monitored in the water over time, except for silicate. In particular, leaf litter from invasive L. camara drove significantly increased nutrient concentrations compared to other native plant species, whilst effects of invasive P. guajava were less statistically clear. The end weights of the leaf litter demonstrated decomposition differences among the species types, following a decreasing order of P. guajava > T. sericea > F. sycomorus > L. camara, further suggesting high organic inputs from invasive L. camara. The study results highlight that differential leaf litter decomposition rates of four plant species can play a significant role in nutrient release, in turn altering aquatic ecosystem productivity. However, these effects likely depend on species-specific differences, rather than between invasive–native species generally. Shifting terrestrial plant communities may alter aquatic community composition, but specific effects are likely associated with leaf traits.

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Section: Discussionsupporting

confidence: 91%

Nutrient Release Dynamics Associated with Native and Invasive Leaf Litter Decomposition: A Mesocosm Experiment

Mutshekwa

Cuthbert

Wasserman

et al. 2020

Water

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“…Alien aquatic plants often compete for space, nutrients, and sediment fertilities with native macrophytes, thus hindering their re-establishment and decreasing diversity (Michelan et al, 2018; Silveira et al, 2018). Some of them aggravate water loss in invaded habitats through extensive transpiration (Fraser et al, 2016); accelerating water pollution by increasing sedimentary organic matter (Cuassolo et al, 2016; Bertrin et al, 2017); and reducing oxygen diffusion across the water–air interface (Chamier et al, 2012), etc.…”

Section: Positive and Negative Impacts Of Global Change On Aquatic Almentioning

confidence: 99%

Global Change Sharpens the Double-Edged Sword Effect of Aquatic Alien Plants in China and Beyond

Ding

2019

Front. Plant Sci.

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Many alien aquatic plants are deliberately introduced because they have economic, ornamental, or environmental values; however, they may also negatively affect aquatic ecosystems, by blocking rivers, restricting aquatic animals and plants by decreasing dissolved oxygen, and reducing native biodiversity. These positive and/or negative ecological effects may be enhanced under global change. Here, we examine the impacts of global change on aquatic alien plant introduction and/or invasions by reviewing their introduction pathways, distributions, and ecological effects. We focus on how climate change, aquatic environmental pollution, and China’s rapid economic growth in recent decades affect their uses and invasiveness in China. Among 55 species of alien aquatic plants in China, 10 species are invasive, such as Eichhornia crassipes , Alternanthera philoxeroides , and Pistia stratiotes . Most of these invaders were intentionally introduced and dispersed across the country but are now widely distributed and invasive. Under climate warming, many species have expanded their distributions to areas where it was originally too cold for their survival. Thus, these species are (and will be) considered to be beneficial plants in aquaculture and for the restoration of aquatic ecosystems (for water purification) across larger areas. However, for potential invasive species, climate warming is (and will be) increasing their invasion risk in more areas. In addition, nitrogen deposition and phosphorus inputs may also alter the status of some alien species. Furthermore, climate warming has shifted the interactions between alien aquatic plants and herbivores, thus impacting their future spreads. Under climate change, more precipitation in North China and more frequent flooding in South China will increase the uncertainties of ecological effects of alien aquatic plants in these regions. We also predict that, under the continuing booming economy in China, more and more alien aquatic plants will be used for aquatic landscaping and water purification. In conclusion, our study indicates that both human activities under rapid economic growth and climate change can either increase the potential uses of alien aquatic plants or make the aquatic invaders worse in China and other areas in the world. These findings are critical for future risk assessment of aquatic plant introduction and aquatic ecosystem restoration.

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“…This can occur because of cell death, but also when cells are damaged by grazers or viral lyses ( Findlay and Sinsabaugh, 2003 ). The nature of this DOC depends on the macrophyte species; it can differ, for example, in colour and C:nutrient ratio ( Cuassolo et al, 2011 ), amount of humic-like matter and photoreactivity ( Cuassolo et al, 2015 ) and percentage of proteins, amino acids and carbohydrates ( Qu et al, 2013 ). Macrophyte DOC is less aromatic than allochthonous DOC but has a similar or higher aromaticity than phytoplankton DOC ( Qu et al, 2013 ).…”

Section: The Effects Of Macrophytes On Aquatic Carbonmentioning

confidence: 99%

The Future of Freshwater Macrophytes in a Changing World: Dissolved Organic Carbon Quantity and Quality and Its Interactions With Macrophytes

2018

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Freshwater ecosystems are confronted with the effects of climate change. One of the major changes is an increased concentration of aquatic carbon. Macrophytes are important in the aquatic carbon cycle and play as primary producers a crucial role in carbon storage in aquatic systems. However, macrophytes are affected by increasing carbon concentrations. The focus of this review lies on dissolved organic carbon (DOC), one of the most abundant forms of carbon in aquatic ecosystems which has many effects on macrophytes. DOC concentrations are rising; the exact cause of this increase is not known, although it is hypothesized that climate change is one of the drivers. The quality of DOC is also changing; for example, in urban areas DOC composition is different from the composition in natural watersheds, resulting in DOC that is more resistant to photo-degradation. Plants can benefit from DOC as it attenuates UV-B radiation, it binds potentially harmful heavy metals and provides CO2 as it breaks down. Yet plant growth can also be impaired under high DOC concentrations, especially by humic substances (HS). HS turn the water brown and attenuate light, which limits macrophyte photosynthesis at greater depths. This leads to lower macrophyte abundance and lower species diversity. HS form a wide class of chemicals with many different functional groups and they therefore have the ability to interfere with many biochemical processes that occur in freshwater organisms. Few studies have looked into the direct effects of HS on macrophytes, but there is evidence that HS can interfere with photosynthesis by entering macrophyte cells and causing damage. DOC can also affect reactivity of heavy metals, water and sediment chemistry. This indirectly affects macrophytes too, so they are exposed to multiple stressors that may have contradictive effects. Finally, macrophytes can affect DOC quality and quantity as they produce DOC themselves and provide a substrate to heterotrophic bacteria that degrade DOC. Because macrophytes take a key position in the aquatic ecosystem, it is essential to understand to what extent DOC quantity and quality in surface water are changing and how this will affect macrophyte growth and species diversity in the future.

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Effect of light on particulate and dissolved organic matter production of native and exotic macrophyte species in Patagonia

Cited by 27 publications

References 74 publications

Nutrient Release Dynamics Associated with Native and Invasive Leaf Litter Decomposition: A Mesocosm Experiment

Nutrient Release Dynamics Associated with Native and Invasive Leaf Litter Decomposition: A Mesocosm Experiment

Global Change Sharpens the Double-Edged Sword Effect of Aquatic Alien Plants in China and Beyond

The Future of Freshwater Macrophytes in a Changing World: Dissolved Organic Carbon Quantity and Quality and Its Interactions With Macrophytes

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