Department Aquatic Ecology

Algal Biodiversity and Ecosystem Functioning

Welcome to the Algal Biodiversity and Ecosystem Functioning Group. We are a part of the Aquatic Ecology Department at Eawag. Our work aims to understand how differences among species allows them to coexist and, in turn, how their coexistence controls the ecological functioning of communities and the services they provide to humanity. Research in our group focuses largely on freshwater phytoplankton for a number of reasons: planktonic organisms are great model organisms for testing and advancing both evolutionary and ecological theory, they are important drivers of global primary production, they are the base of freshwater food webs, and they may be an important source of energy for humans in the future. Our approach is largely experimental and it aims to test theory using microcosm, mesocosm and field experiments. We also use meta-analysis and model-fitting approaches to draw inferences from large data-sets and field survey data.

Research Focus

Causes of biodiversity: the environment, evolutionary history, and traits:

  1. Is biodiversity really declining locally in natural ecosystems?
  2. How do species respond to and avoid competition, in order to coexist?
  3. Does local adaptation to competition lead to trait divergence, enabling coexistence?
  4. How does the environment control the traits responsible for competitive coexistence?

Consequences of biodiversity at the ecosystem level:

  1. What are the impacts of intra- and interspecific diversity on algal primary production and other ecosystem functions?
  2. Are diverse systems more stable?
  3. What traits drive stability?

Gallery

Photos are by Rogelio Moreno G.

Current Projects

Laboratory experiments under controlled chemostat conditions have indicated that evolution of algal populations can occur on ecological time-scales and can significantly alter community dynamics and ecosystem ...
Using remote-sensing we are able to make inferences about global average trends of change within local ecosystems
In an outdoor replicated whole-pond experiment, we aim to understand the relative contributions of ecological species turnover and evolutionary adaptation in phytoplankton communities
In this project we are investigating the impact of evolution on the genetics, proteomics and phenotypic traits that control competitive species interactions and community assembly in freshwater algae.
We are collecting an extensive database of algal ecological and physiological traits, and testing whether these traits are capable of correctly predicting community dynamics over time in response to environmental changes.

Team

Raphael BossartTel. +41 58 765 5934Send Mail
Dr. Irene GallegoTel. +41 58 765 5313Send Mail
Jana JuckerTel. +41 58 765 5657Send Mail
Marta ReyesResearch TechnicianTel. +41 58 765 6725Send Mail
Marco ThaliTel. +41 58 765 5796Send Mail