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MEET A LEAF: GABRIELE mANOLI

2/25/2019

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Dr. Gabriele Manoli is a Branco Weiss Fellow holding a postdoc position at ETH Zürich (transitioning to a lecturer position at University College London).
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What does ecohydrology mean to you?
The term ecohydrology clearly recalls a combination of the words “ecology” and “hydrology” to describe “an interdisciplinary field studying the interactions between water and ecosystems”. This definition, however, is somewhat reductive – especially if the word “interdisciplinary” does not receive the attention it deserves. To me ecohydrology really means bridging disciplines and scales to study the complex interactions regulating mass and energy exchanges within the biosphere (i.e. our “house”, as the term “eco” recalls). This makes ecohydrology an exciting quest for understanding, following water in its countless interactions with Earth (its surface, subsurface, and atmosphere) and Life (plants, bacteria, humans – you name it!). This knowledge provides unique tools to understand global change and guide a sustainable management of natural resources.

What are your undergraduate and graduate degrees in?
I obtained both my BSc and MSc degrees in Environmental Engineering (University of Padova and Technical University of Denmark). I have a PhD in Civil and Environmental Engineering Sciences at the University of Padova (Italy).

How did you arrive at working in/thinking about ecohydrology?
Everything started with the Richards equation! One of the tasks during my PhD was the implementation of a root water uptake module in the catchment-scale hydrological model CATHY. From a “mathematical” perspective, root water uptake is just a sink term in the Richards equation - but in reality, it is much more than that! Under the guidance of my advisor, Mario Putti, I visited Duke University where, together with Gabriel Katul, Marco Marani, Jean-Christophe Domec, and Sara Bonetti, I worked on modeling soil-plant processes, combining numerical methods with concepts of plant hydraulics, plant physiology, and land-atmosphere interactions. Suddenly, I was working on ecohydrology!

What do you see as an important emerging area of ecohydrology?
We are in a phase of rapid global changes, our planet is becoming increasingly urbanized, and human activities now rival the geophysical processes that shaped Earth. In this regard, the emerging area of “urban ecohydrology” offers a novel perspective on coupled human-natural systems. Cities are hot-spots for innovation but they also drive a loss of ecosystem services at multiple scales. The knowledge and approaches of ecohydrology are essential to describe such complex interactions between urban and natural ecosystems, offering new tools for planning and retrofitting of cities.

Do you have a favorite ecohydrology paper?  Describe/explain.
Picking one paper is quite difficult but I’d like to mention the review by Gabriel Katul and coauthors, “Evapotranspiration: a process driving mass transport and energy exchange in the soil‐plant‐atmosphere‐climate system”, Reviews of Geophysics, 2012, 50(3). Focusing on evapotranspiration, this paper provides a fantastic overview of the processes, scales, and feedbacks regulating water, carbon, and energy fluxes at the land surface, from leaf-scale processes to boundary-layer dynamics and the global water cycle.

What do you do for fun (apart from ecohydrology)?
I enjoy art and nature, good food and good company.
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MEET A LEAF: KELLY CAYLOR

2/18/2019

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Dr. Kelly Caylor is the Director of the Earth Research Institute and is a Professor in the Department of Geography and Bren School of Environmental Sciences at UC Santa Barbara. Twitter: @kcaylor
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What does ecohydrology mean to you?
The definition of ecohydrology, which I will not attempt, is separate from its meaning to me. For me, ecohydrology meant - and still means - a personal pathway forward in the sciences. During my PhD work, I was a small part of a massive field campaign. Everywhere I looked someone was doing something I was interested in way better than I could ever hope to. It was deflating.  But I continued to dutifully count and map my savanna trees hoping I’d figure out what I was “really working on”. I also spent a fair amount of time sitting under some of these same trees questioning my decision-making and wondering if there was any University I could transfer to where you could get a PhD in tree counting. At some point, I had the realization that my new-found interest in “figuring out what the hell was going on, under savanna tree canopies” could just be re-packaged as “figuring out what the hell was going on under savanna tree canopies”. I got back from the field and threw myself into the study of spatial patterns, surface hydrology, and vegetation ecology. In ecohydrology, I had found an intellectual crack into which I could throw down roots.  

What are your undergraduate and graduate degrees in?
Both my undergraduate and graduate degrees are from the University of Virginia, in Environmental Science.

How did you arrive at working in/thinking about ecohydrology?
The most formative experience in my professional life was the seminar that Ignacio Rodriguez-Iturbe gave at the University of Virginia when I was about two years from finishing my PhD. At that time, Ignacio was working with Francesco Laio, Luca Ridolfi, and Amilcare Porporato on a four-part series of classic papers that would appear in Advances in Water Resources in 2001. Ignacio’s seminar was like a lightning bolt: It was intensely illuminating, awesome in its power, and… it was very loud. I barged into his scheduled meeting with my PhD Advisor, Hank Shugart, and essentially demanded to know what sort of wizard he was that had - sight unseen - turned all of my notebook doodles and sketches into analytical solutions of stochastic differential equations. He generously invited me to collaborate with him and later - despite his otherwise good judgement - offered me a postdoc. Most importantly he has been a good friend, dear colleague, and outstanding mentor for almost two decades.

What do you see as an important emerging area of ecohydrology?
What initially drew me to ecohydrology was the opportunity to marry the technical and empirical depth derived from hydrological sciences with the beauty and elegance of ecological theory and experimentation. I still think that sort of work is critical to fueling our intellectual minds and my desire for better questions still outweighs my interest in better answers. But I have also become increasingly interested in the application of ecohydrological approaches to solving problems with both immediacy and specificity. There are many excellent areas emerging in ecohydrology related to responses of organisms and ecosystems to climate change, applications to landscape and species conservation, and linkages to preserving critical ecohydrological services. These areas are increasingly able to make direct contributions to the sustainable management of our landscapes, and I can’t think of anything more important than that.

Do you have a favorite ecohydrology paper?  Describe/explain.
Picking favorites is hard, and I’m reluctant to do so. But I will say that the work of Dave Breshears has always been important to me (see example here). Effective scientific communication (and here I am speaking of research articles, not tweets) is extremely difficult, particularly when working across disciplines. I hammer the importance of writing well to all of my students. Unfortunately, my efforts lack consistency in this regard, but I can pick up almost any paper of Dave’s and use it as a teaching tool for what works in a field where it’s easy to fall into bad habits.

What do you do for fun (apart from ecohydrology)?
I enjoy hiking and camping a great deal. Cooking is fun enough for me that I once taught an undergraduate “science of food” course with a chef.  I would also say I enjoy gardening, but in Santa Barbara that is essentially applied ecohydrology, so I can’t include it.  I find that academics (at least this one) are pretty good at handling delayed gratification and I am usually in the middle of two or three projects related to boat building, car restoration, or some other decadal-scale activity.
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MEET A LEAF: AMY HANSEN

2/11/2019

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Dr. Amy Hansen is an Assistant Professor in the ​Department of Civil, Environmental and Architectural Engineering at the University of Kansas.
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What does ecohydrology mean to you?
I think of ecohydrology as the study of the interdependence of ecological and hydrological processes. Ecohydrolology accounts for some of the most common feedbacks in a natural system. For example, aquatic plants obstruct the movement of water in streams yet the movement of water also regulates plant growth by changing the supply of nutrients and, in turbid waters, the available light. I really enjoy thinking about positive and negative feedbacks between ecological and hydrological systems and how those might be either dampening or amplifying an external change that is imposed on the overall system.

What are your undergraduate and graduate degrees in?
As an undergraduate, I wanted to design cars to go faster (yeah, I know). To that end, my undergraduate degree is in Engineering and Applied Science from Caltech and my Master’s degree is in Mechanical Engineering from University of Michigan. After 7 years of working in industry, a year-long road trip around the USA and 2.5 years in Peace Corps, I had something of an epiphany regarding how I wanted to use my time and energy and changed direction from the mysteries of the internal combustion engine towards a much more complicated topic; the mysteries of the natural environment. Subsequently, my PhD is in Civil Engineering with an Ecology minor from University of Minnesota, advised by Jacques Finlay in Ecology and Miki Hondzo in Civil Engineering.

How did you arrive at working in/thinking about ecohydrology?
Just before beginning my doctorate program, I was living in Honduras as a U.S. Peace Corp volunteer. In this role, I worked with rural community drinking water organizations who were interested in improving the quality of their water and/or protecting their source watersheds. I was struck by the complete lack of financial resources that made the conventional methods to clean up water, which all have a relatively high associated cost, useless for them. At that time, I was thinking a lot about cheap ways to improve water quality and how poor water quality can impact all organisms, not just humans. I started getting interested in studying the role that vegetation plays in nutrient and contaminant cycling in river networks. It was interesting enough to me that when I returned to the U.S. I left my career in Mechanical Engineering behind to pursue a PhD.    

What do you see as an important emerging area of ecohydrology?
The incorporation of aquatic ecology into water quality models. Aquatic vegetation, floodplain vegetation, and filter feeding organisms can all change hydrological conditions and water chemistry yet are seldom incorporated into water quality models. We represent microbial processes better! For example, filter feeding organisms such as freshwater mussels alter water quality by filtering out suspended particulates. In large enough numbers or in slow enough flow rates, mussels can have a measureable effect on water clarity. I think that experimental researchers recognize that interactions between hydrology and larger organisms can be significant but they are still not yet well incorporated into river network or watershed models.

Do you have a favorite ecohydrology paper?  Describe/explain.
I really like the review paper by Catriona Hurd (2000), “Water motion, marine macroalgal physiology, and production”. This was the first paper I encountered that laid out the interdependencies between the hydrodynamics and the ecology of a system including implications for nutrient and carbon cycling, light availability, productivity and imposed environmental conditions on other dependent organisms within the kelp canopy. In addition, she described eco-hydro connections at a large range of spatial scales which shows how complex some of these questions can be.    

What do you do for fun (apart from ecohydrology)?
I go outside and walk somewhere wild. I bring my binoculars and one of my kids and I see what I can see. Binoculars are great conversation starters – people often stop us and ask what we have seen! I also like to camp, swim, paddleboard and read.  
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MEET A LEAF: RYAN MORRISON

2/4/2019

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Dr. Ryan Morrison is an Assistant Professor in the Department of Civil and Environmental Engineering at Colorado State University (Twitter: @ryanrmorrison)
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What does ecohydrology mean to you?

The “eco” and ecohydrology really adds a new dimension to hydrology compared to how hydrology is taught in engineering disciplines. This new dimension is really exciting, especially when incorporated with water management and linked with human needs. The field of ecohydrology demonstrates the complex interactions between aquatic ecosystems and natural hydrologic cycles, which is important for informing how we manage and restore aquatic environments.

What are your undergraduate and graduate degrees in?
My education is in civil engineering, through and through. I received my B.S. and M.S. in Civil Engineering from Washington State University, and my Ph.D. in Civil Engineering from the University of New Mexico.

How did you arrive at working in/thinking about ecohydrology?
Although all my degrees are in civil engineering, I was lucky to collaborate with a lot of non-engineers, especially riparian and aquatic ecologists, during my education. While an undergraduate student I worked for Mark Stone (who became my PhD advisor years later!) on his PhD research examining the links between hydraulic turbulence and periphyton grown in cobble-bed rivers, and from that point forward I’ve been interested in ecohydrological questions. This interest has allowed me to work on a variety of ecohydrology-related topics while in my graduate and post-graduate roles, including the impacts of river management on riparian vegetation recruitment, the influence of levees on floodplain wetland habitat, and socio-ecological tradeoffs associated with environmental flows. Much of my research now focuses on the importance of floodplain services for ecological and geomorphic processes and how we can better integrate floodplain services into river management.

What do you see as an important emerging area of ecohydrology?
I think we still have a lot to learn regarding the interactions between surface water exchange flows and floodplain vegetation. There has been some great work recently published about the importance of subsurface hydrologic exchange flows and their importance in riverine processes, but we are still struggling to quantify surface exchange flows during flooding events. The lessons learned from research about the interaction of floodplain vegetation, hydrologic dynamics, and floodplain ecosystem services can help move river restoration science forward.

Do you have a favorite ecohydrology paper?  Describe/explain.
I always come back to H.B.N. Hynes’ “The Stream and Its Valley” (1975), especially the concluding paragraph. Although encompassing more than ecohydrology, it is a beautifully written lecture about the inseparable interactions between river biotic and abiotic processes. I wish all papers were written as clearly and succinctly as this one.

What do you do for fun (apart from ecohydrology)?
Lately, my fun-time is spent either running on Colorado trails or enjoying the company of my 4-year old daughter. Both are exhausting!
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