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17 déc.

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Field experiment for Task 2

Response of the bromeliad ecosystem to altered precipitation over a biogeographical gradientPuerto_Rico are now completed. We've been both adding and subtracting precipitation to bromeliad catchments in Costa-Rica, Puerto-Rico and French Guiana. In each country theduration of the experiment was 2-months, to encompass the entire larval stageof most bromeliad-dwelling aquatic invertebrates. Bromeliads were sheltered from the natural rainfall, and heroic post-docs have simulated rainfalls by watering the plants every day following 30 different rainfall patterns at each site, sometimes carrying up to 60 liters of rainwater per day. At each site, bromeliads represented different precipitation treatments. The precipitation treatments differed in the mean amount of rainfall per day (mu) and the frequency of large versus small rainfall events (k, dispersion). Equalized communitiesAll treatments are expressed relative to the average ambient mu and k calculated from rainfall patterns over the past 10 years. At the end of the experiment, all bromeliads were dismantled to exhaustively sample aquatic and terrestrial invertebrates, micro-fauna, and microorganisms. We will now quantify the effects of altered precipitation on both the structureand functioning of the food web. The main response variables include: community diversity, from bacteria to invertebrates; food web structure; nitrogen flux; detrital decomposition and production of fine particulate organic matter; emission of C02 and methane - two greenhouse gases that feed back to climate change.
(July 3, 2014)


Welcome Héctor Rodriguez-Perez !

Héctor will join the Ecofog team as post-doc fellow, starting July 2014. He will be in charge of future field experiments in French Guiana and Puerto-Rico.

(July 3, 2014)


Rainwebs is launched

The ANR-funded project Rainwebs on climate change and food webs was launched on Dec 15th, 2012, and will extend over 48 months. Visit the brand new website for more information. Contact : R. Céréghino, Ecolab Laboratoire Ecologie Fonctionnelle et Environnement, UMR 5245, Toulouse, France.
 (February 7, 2013)

Last updated July 8, 2014

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