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Bioturbation effects on bioaccumulation of cadmium in the wetland plant Typha latifolia: A nature-based experiment

Citation: Hoang, T.K., Probst, A., Orange, D., Gilbert, F., Elger, A., Kallerhoff, J., Laurent, F., Bassil, S., Duong, T.T., Gerino, M., 2018. Bioturbation effects on bioaccumulation of cadmium in the wetland plant Typha latifolia: A nature-based experiment. Sci. Total Environ. 618, 1284–1297. doi:10.1016/j.scitotenv.2017.09.237
Hoang T.K., Probst A., Orange D., Gilbert F., Elger A., Kallerhoff J., Laurent F., Bassil S., Duong T.T., Gerino M., Science of the Total Environment, 2018
The development of efficient bioremediation techniques to reduce aquatic pollutant load in natural sediment is one of the current challenges in ecological engineering. A nature-based solution for metal bioremediation is proposed through a combination of bioturbation and phytoremediation processes in experimental indoor microcosms. The invertebrates Tubifex tubifex (Oligochaeta Tubificidae) was used as an active ecological engineer for bioturbation enhancement. The riparian plant species Typha latifolia was selected for its efficiency in phyto-accumulating pollutants from sediment. Phytoremediation efficiency was estimated by using cadmium as a conservative pollutant known to bio-accumulate in plants, and initially introduced in the overlying water (20 μg Cd/L of cadmium nitrate – Cd(NO3)2·4H2O). Biological sediment reworking by invertebrates’ activity was quantified using luminophores (inert particulates). Our results showed that bioturbation caused by tubificid worms’ activity followed the bio-conveying transport model with a downward vertical velocity (V) of luminophores ranging from 16.7 ± 4.5 to 18.5 ± 3.9 cm·year− 1. The biotransport changed the granulometric properties of the surface sediments, and this natural process was still efficient under cadmium contamination. The highest value of Cd enrichment coefficient for plant roots was observed in subsurface sediment layer (below 1 cm to 5 cm depth) with tubificids addition. We demonstrated that biotransport changed the distribution of cadmium across the sediment column as well as it enhanced the pumping of this metal from the surface to the anoxic sediment layers, thereby increasing the bioaccumulation of cadmium in the root system of Typha latifolia. This therefore highlights the potential of bioturbation as a tool to be considered in future as integrated bioremediation strategies of metallic polluted sediment in aquatic ecosystems. © 2017 Elsevier B.V.

Building land with a rising sea

Citation: Temmerman, S., & Kirwan, M. L. (2015). Building land with a rising sea. Science, 349(6248), 588–589. 
Science - Vol. 349
Coastal lowlands are increasingly exposed to flood risks from sea-level rise and extreme weather events (1). Megacities like Shanghai, London, New York, and Bangkok that lie in vast river deltas are particularly vulnerable. Dramatic flood disasters include the Indian Ocean tsunami in 2004, Hurricane Katrina in New Orleans in 2005, Hurricane Sandy in New York in 2012, and Typhoon Haiyan in the Philippines in 2013. Managing the risks of such disasters requires investments in short-term emergency response and long-term flood protection (2), including nature- or ecosystem-based engineering (3, 4). On page 638 of this issue, Tessler et al.(5) show that sealevel rise, increasing climate extremes, population growth, and human-induced sinking of deltas threaten the sustainability of many major deltas around the world.

Building Urban Resilience with Nature - A Practitioner's Guide to Action

Citation: This report is authored by Matt Chadsey with Earth Economics and Maree Grenfell with Resilient Melbourne, with the support of Sandy Tung of 100 Resilient Cities – Pioneered by The Rockefeller Foundation.
Recognizing that the value and role of nature was missing from mainstream planning and decision-making processes, Earth Economics and Resilient Melbourne took up the challenge of creating a practitioner resource for all those who are determined to take concrete steps to bridging the gap between the need to value nature, and political and financial will in policy and capital investments. “Building Resilience with Nature: A Practitioner’s Guide to Action” was released the occasion of the Network Exchange: Nature-Based Solutions for Resilient and Biodiverse Cities, which took place in Milan from November 28 – 29, 2018. Hosted by the Municipality of Milan and Feltrinelli Foundation, this two-day convening featured Chief Resilience Officers from Milan, Melbourne, Paris, Greater Manchester, Toronto, Athens, Quito, Buenos Aires, Tel Aviv, and Lisbon, to build on the work done to date. City delegates presented their findings at the Mantua World Forum on Urban Forests immediately following the event.

Cache La Poudre River Restoration through Partnerships

Cache La Poudre River Restoration through Partnerships

Video Source:

Colorado Water Trust (link)

This video showcases the work of the City of Fort Collins Natural Areas Department's restoration at McMurry and North Shields Ponds, lowering unnaturally steep riverbanks and removing an abandoned diversion structure which improved the habitat on the Cache la Poudre River. In 2014, the Natural Areas Department received two Blue Grama awards from the Colorado Open Space Alliance for their outstanding conservation work.

Can we reconnect rivers and provide multi-functional restoration in Med areas?

PDF icon f.magdaleno_0.pdf6.86 MB
Presentation in Horizon 2020 European Dialogue and Clustering Action "Transforming cities, enhancing wellbeing: innovating with nature-based solutions" (Coruna, Spain: 16-18 May 2018) about "Benefits of ecosystem restoration"

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