Biodiversity can also destabilize ecosystems

phys.org | 10/18/2018 | Staff
megzmegz123 (Posted by) Level 3
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Ecosystems have a variety of benefits to humans, including food, water and other resources, as well as recreational space. It is therefore important that these systems remain functional and stable—especially in view of climate change and environmental pollution. Ecologists at the University of Zurich and the Swiss Federal Institute of Aquatic Science and Technology (Eawag) have now examined the factors that influence this stability in a unique and comprehensive experiment.

The scientists specifically researched how biodiversity affects the stability of ecosystems. As model organisms, they used six species of ciliates—tiny protozoans that live in water. The researchers put varying numbers and combinations of these ciliates in sample vials, thereby creating miniature ecosystems that they then let thrive at temperatures between 15 and 25 degrees Celsius. The increased temperatures simulated a climatic change, as the ciliates used in the experiment previously lived at a temperature of 15 degrees Celsius.

Researchers - Evaluation - Techniques - Biomass - Production

The researchers then used novel video evaluation techniques to analyze how stable the biomass production in these small ecosystems was. An algorithm developed by the team made it possible to identify the ciliate species in about 20,000 video sequences of the numerous samples recorded under a microscope.

At first glance, the results of the experiment seem contradictory: High biodiversity simultaneously furthers and hinders...
(Excerpt) Read more at: phys.org
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