Survival data of daphnia prey depending on lighting conditions during the larval development and test

Bac, rearing tank. Date, date of the experiment. Ind, individual identity. Fem, mother identity. Rear, UV+ or UV- developmental lighting environment. Light, UV+ or UV- testing environment. Ordre, test order (UV+ or UV- in first). Time, time at which the daphnia was eaten. Status, alive (0) or dead (1) daphnia.NB: 8 daphnia were presented simultaneously to each larva for each test

Mesures de vitesses acoustiques en temps réel par LDV

International audienceno abstrac

Habitat-related variation in the plasticity of a UV-sensitive photoreceptor over a small spatial scale in the palmate newt

Plastic phenotypes are expected to be favoured in heterogeneous environments compared with stable environments. Sensory systems are interesting to test this theory because they are costly to produce and support, and strong fitness costs are expected if they are not tuned to the local environment. Consistently, the visual system of several species changes with the conditions experienced during early development. However, there is little information on whether the amplitude of the change, that is the reaction norm, differs between visual environments. Given the rapid change of many ecosystems, especially eutrophication for aquatic habitats, it is crucial to determine down to which spatial scale, change in the reaction norm occurs. We addressed this issue by quantifying the between-habitat variation in the expression of a UV-sensitive opsin in a newt. In western France, this species breeds in ponds of small forest patches, where water filters out UV, and in agricultural ponds where UV transmission is variable. We raised larvae from both habitats with or without exposure to UV. Opsin expression was reduced in larvae from agricultural habitats when raised without UV, whereas it was low in larvae from forest ponds under all lighting conditions. Thus, the variation in the reaction norm of opsin expression was lower in stable filtering environments and higher in heterogeneous environments. Its variation occurred between habitats across a small spatial scale. We discuss the hypotheses for this pattern and for the maintenance of residual opsin expression in forest populations

Reflectance spectra of daphnia fed on luteinised or non-luteinised yeasts

wl, wavelength. Reflectance measured at each wavelength for each lot of daphnia. Lutein1, 2 and 3, daphnia fed on luteinised yeasts. NOLutein1, 2 and 3, daphnia fed on non-luteinised yeasts

Relative mRNA quantity of SWS1 and LWS opsin genes for newt larvae raised in UV+ and UV- lighting conditions

Opsin, SWS1 or LWS opsin genes. Rear, UV+ and UV- lighting conditions during development. Ind, individual identity. RNA, relative mRNA quantity

Etude de la contribution de la fraction instable des sols dans le transfert du glyphosate

Date du colloque&nbsp;: 2013</p

Etude de la contribution de la fraction instable des sols dans le transfert du glyphosate

Date du colloque&nbsp;: 2013</p

Etude de la contribution de la fraction instable des sols dans le transfert du glyphosate

Date du colloque&nbsp;: 2013</p

Etude des transferts de produits phytosanitaires vers les eaux de surface

Date du colloque&nbsp;: 2012</p

Transport particulaire des résidus de pesticides vers les eaux de surfaces

Date du colloque&nbsp;: 2014</p