Research and publications

My motto is Research * Engagement = Progress. I came up with this ‘formula’ whilst working at Earthwatch Europe, an environmental charity where I switched from pure research to research and project management. I have been since maintaining research collaborations with (other) academics, also as part of my active courtesy affiliation with Florida International University.  

I have been working at Thames21 as Plastic Free Rivers Project Coordinator since spring 2021, managing the citizen science and engagement Plastic Free Mersey project. I previously worked as a Tree Planter for Thames21 as part of the Enfield Chase Restoration project in North London, led by Enfield Council. I am finalising a collaborative book chapter on wetland monitoring for a book to celebrate the Ramsar Convention’s 50th anniversary and contributing to publications on metacommunity dynamics in the context of a US Long Term Ecological Research programme working group, of of which was published in Frontiers in Ecology and Evolution and one is published in Oikos.

My research has so far focused on: patterns and drivers of species richness and diversity, biomass and ecology of algae in the Everglades, the Okavango Delta, and other subtropical wetlands, and the ways these respond to hydrology, limiting nutrients, and habitat, and lately, wetland restoration, and plastic pollution in rivers. See my Research Gate profile for all my contributions.

In 2019-2020 I co-led Earthwatch Europe’s Plastic Rivers project in southeastern England (Surrey and North Hampshire) by developing methods to monitor plastic pollution along four rivers (Hart, Whitewater, Blackwater and Mole) and to estimate people’s plastic use (see our brand new on-the-go plastic use calculator). I also co-published a manuscript in PLOS ONE to rank consumer-based actions to reduce plastic use and consequent pollution and co-led grant proposals to tackle plastic pollution in UK and Indian catchments in collaboration with other NGOs and universities.

In 2015-2018, I participated in Florida International University’s annual Comprehensive Everglades Restoration Plan (CERP) sampling of periphytic algae, invertebrates and small fish in the Water Conservation Areas and Everglades National Park.

In 2018, I led a multi-author review paper on foundation species in freshwater wetlands that has been now published in Water for the Special Issue “Multiplicity, Characteristics, Main Impacts, and Stewardship of Natural and Artificial Freshwater Environments: Consequences for Biodiversity Conservation“.

In 2017-’18, I analysed data on diatom abundance from 165 samples collected in the FCE LTER sites in Shark River Slough and Taylor Slough from 2004 to 2015 and wrote an article on how and why few core species dominate diatom abundance in Everglades benthic mats. This manuscript is published in Inland Waters. See this link for a summary for the public:

In 2017-’18, I wrote a collaborative manuscript on how to assess and improve the effectiveness of wetland restoration activities with Dr. Gaiser and Dr. Kominoski (FIU), Dr. Julian (University of Florida); and Dr. Finlayson (Charles Sturt University), and Dr. Gell (Federation University) in Australia. This paper is published in Solutions.

In 2016-’17, I closely co-mentored, with Dr. Gaiser, FIU biochemistry undergraduate student Andres Sola on his experimental project on the effects of drying and rewetting and nutrient loading on periphyton N:P stoichiometry, now published in Water.

In 2016-’17, I conducted a study of how algal dominance markedly increases with limiting nutrient (phosphorus) scarcity and desiccation stress in the Everglades, which was published in Aquatic Ecology.  I presented this work and the comparative study on algal species richness at the 2017 Society of Wetland Scientists meeting in San Juan, Puerto Rico.

In 2015-’16, I produced an extensive comparison of algal richness patterns and drivers in the Okavango Delta and the Everglades, published in Freshwater Biology (submitted version free access: marazzi_et_al-_freshwater_biology_submitted). I presented this research at the 10th INTECOL Wetlands conference in Changshu (China) on September 24 in session #70 “Wetlands: Monitoring and Management”, which I co-moderated. Here I co-organized the “The Next Generation of Wetland Science: Ecosystems, Applications, and Engineering” workshop in collaboration with the International Network of Next Generation Ecologists.

In September 2015, I co-organized a working group on comparative research on inland freshwater wetlands at the All Scientists Meeting of the U.S. Long Term Ecological Research Network seeking to pursue collaborations across LTER sites.

In April 2015, I presented a preliminary comparison of research on algal richness in the Okavango Delta  and the Everglades at the Greater Everglades Ecological Restoration (GEER) meeting (Coral Springs, Florida).

In November 2014, I defended my Ph.D. Thesis “Biodiversity and Biomass of Algae in the Okavango Delta (Botswana), a Subtropical Flood-Pulsed Wetland” at the Environmental Change Research Centre, University College London, United Kingdom.

Refereed Publications:

Hill, M.J., Greaves, H.M., Sayer, C.D., Hassall, C., Milin, M., Milner, V.S., Marazzi, L., Hall, R., Harper, L.R., Thornhill, I. and Walton, R., 2021. Pond ecology and conservation: research priorities and knowledge gapsEcosphere12(12), p.e03853.

Record, S., Voelker, N.M., Zarnetske, P.L., Wisnoski, N.I., Tonkin, J.D., Swan, C., Marazzi, L., Lany, N., Lamy, T., Compagnoni, A. and Castorani, M.C., 2020. Novel insights to be gained from applying metacommunity theory to long-term, spatially replicated biodiversity dataFrontiers in Ecology and Evolution8, p.479.

Marazzi L, Loiselle S, Anderson LG, Rocliffe S, Winton DJ (2020) Consumer-based actions to reduce plastic pollution in rivers: A multi-criteria decision analysis approach. PLoS ONE 15(8): e0236410.

Kominoski, J.S., Gaiser, E.E., Castañeda‐Moya, E., Davis, S.E., Dessu, S., Julian, P., Lee, D.Y., Marazzi, L., Rivera‐Monroy, V.H., Sola, A. and Stingl, U., 2020. Disturbance legacies increase and synchronize nutrient concentrations and bacterial productivity in coastal ecosystemsEcology, p.e02988

Marazzi L., Gaiser E.E., Eppinga M.B., Sah J.P., Zhai L., Castañeda-Moya E., Angelini C. 2019. Why Do We Need to Document and Conserve Foundation Species in Freshwater Wetlands? Water 11: 265.

Marazzi L., Gaiser E.E. 2018. Long-term changes in spatially structured benthic diatom assemblages in a major subtropical wetland under restoration. Inland Waters 8: 434-448.

Marazzi L., Finlayson M.C., Kominoski J.S., Julian P., and Gaiser E.E. 2018. Balancing wetland restoration benefits to people and nature. Solutions 9(3).

Sola A.D., Marazzi L., Flores M.M., Kominoski J.S. Gaiser E.E. 2018. Short-Term Effects of Drying-Rewetting and Long-Term Effects of Nutrient Loading on Periphyton N: P StoichiometryWater 10: 105.

Marazzi, L., Gaiser, E.E. and Tobias, F.A.C., 2017. Phosphorus scarcity and desiccation stress increase the occurrence of dominant taxa in wetland benthic primary producer communities. Aquatic Ecology51(4), pp.571-589.

Marazzi, L., Gaiser, E.E., Jones, V.J., Tobias, F.A. and Mackay, A.W., 2017. Algal richness and life‐history strategies are influenced by hydrology and phosphorus in two major subtropical wetlands. Freshwater Biology62(2), pp.274-290.

Marazzi L. 2016. A Macat analysis of Mathis Wackernagel and William Rees’s ‘Our Ecological Footprint: Reducing Human Impact on the Earth’. CRC Press.

Marazzi L. 2013. Okavango Delta – Biodiversity of Microalgae, precious invisible plants. – In: Oldeland, J., Erb, C., Finckh, M., Jürgens, N. [Eds.]: Environmental Assessments in the Okavango Region. – Biodiversity & Ecology 5: 161-163. DOI: 10.7809/b-e.00272.

Williamson D.B. and Marazzi L.. 2013. A new Cosmarium (Chlorophyta, Desmidiaceae) variety from the Okavango Delta, Botswana. Quekett Journal of Microscopy 42, 35:37.

Marazzi L., Caserini S., Lapi M., Crovetto G.M., Ballarin Denti A. “Estimate of wood consumption for domestic heating in Lombardy: survey methodology and environmental implications”. La Rivista dei Combustibili, n. 5-2006 (in Italian)

Book chapters:

Bosello F., Marazzi L.; in “Climate change and adaptation strategies in Italy, an economic valuation”, Carraro C. (2008). “Italian Alps and climate change: elements of environmental and economic vulnerability and possible adaptation strategies” Ed. Il Mulino (in Italian)

Reports and press:

Owen M.J., Drake K.R., Maslin M.A., Comberti, C., Marazzi L., Mitchell L.T. (2012). ‘Structural vulnerability and potential catastrophic loss scenarios for North Sea oil and gas infrastructure’, A report by the UCL Environment Institute for JLT Reinsurance Brokers Limited. 220 pp.

McGregor J., Busani M., Marazzi L. (2011) “Case Study Zimbabwe” in “Foresight: Migration and Global Environmental Change Final Project Report”. The UK Government Office for Science.

Bigano A.,De Miglio R.,Galeotti, M., Gargiulo M., Goria A., Lavagno E., Marazzi L., Sferra F., Zanoni D. “Adoption and application of the MARKAL-TIMES model for the creation of a mitigation plan for the Lombardy region”. Report FEEM – Kyoto Lombardia Project, May 2008.

Marazzi L.Self-funded PhD students deserve support, not stigma and secrecy”. The Guardian – (Higher Education Network), 6 June 2013.