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24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

Menu Logo Principal Agrocampus Ouest

ESE - Ecology and Ecosystem Health

Thesis Defense of Julien Raitif

Next Thesis Defense JR
December 18th 2018, at 14:00, Agrocampus Ouest Rennes, Moule Amphitheatre

"Ecosystem services provided to agriculture by aquatic insects emerging from rivers"  

Abstract :

The  connection between aquatic and terrestrial habitats has increased scientific interest in ecological subsidies, focusing on how the transfer of matter and energy between adjacent ecosystems can modify the ecosystems functioning. Much attention has focused on aquatic subsidies associated with winged aquatic insects in pristine areas, but their implication in agricultural landscapes is rarely considered. By altering the production of benthic macroinvertebrates, agricultural practices can increase or decrease the strength of aquatic subsidies and subsequently the provision of several ecosystem services to agriculture.
We have monitored the emergence and inland dispersal of adult aquatic insects from several agricultural streams. Most emerging dry mass (DM) belong to Trichoptera (56%), Chironomidae (25%) and Ephemeroptera (19%).
We estimate that annual emerging dry mass of aquatic insects ranged between 1445 and 7374 mg m-2 y-1 depending on stream. The majority of aquatic insects emerging falls between 0 and 10 meters from stream hedges. However, a great proportion (45%) though disperses and eventually falls between 10 and 100 meters from the stream. We provide new and promising evidence suggesting that winged stream insects can support several ecosystem services (soil fertilization, crop pest control, water purification and pollination). In agricultural landscapes, a rich and abundant insect community is necessary to promote sustainable practices, and we believe the role of aquatic subsidies in providing ecosystem services to agriculture is a new and promising field of research in agroecology.

Jury :

Pr Pierre Marmonier - Université Lyon 1, CNRS
Dr Jean-Nicolas Beisel - Université Stratsbourg, Ecole Nationale du Génie de l'Eau et de l'Environnement de Strasbourg, CNRS
Dr Julien Cucherousset - Université Toulouse 3, CNRS
Dr Aude Vialatte - ENSA Toulouse, DYNAFOR
Pr Françoise Burel - Université de Rennes 1, CNRS
Dr Simon Harrison - University College Cork (Ireland)
Dr Jean-Marc Roussel, UMR ESE, INRA
Pr Manuel Plantegenest, UMR IGEPP, Agrocampus Ouest/INRA