Diversity of trophic interactions between microorganisms and microcrustaceans in a macrophyte littoral zone : consequences for essential fatty acid transfer
type: Dataset
description: Areas with littoral macrophytes play an important functional role in freshwater systems. In addition to the high productivity recorded in such areas, they also shelter a high diversity of organisms. However, possible links between spatial heterogeneity, biodiversity and energy pathways are still poorly known. As they constitute the major link between microorganisms and species higher in the food web, microcrustaceans play a key role in the transfer of polyunsaturated fatty acids (PUFA) to organisms at higher trophic levels. In this study, we wanted to assess if microcrustaceans diversity encountered in macrophytes littoral zones would lead to a variability of PUFA transfer in the food web. This work combined controlled conditions experiment and studies run in natural environments in order to help the interpretation of results from lipid analysis, isotopic analysis and fatty acid isotope analysis. Our results indicate that there are no differences of PUFA concentrations between cladocerans from a macrophyte littoral zone when they were exposed to the same pool of dietary PUFA. Hence, in heterogeneous feeding habitats such as macrophytes zones where these cladocerans often co-exist, foraging behavior of cladoceran species more than differences of metabolism may be crucial for determining PUFA transfer to upper trophic levels. In addition to seston, our study shows indeed that some cladoceran species are able to forage on the epiphytic and neustonic compartments. Lipid analyses highlight moreover that the diversity of trophic compartments lead to a variability of PUFA inputs to primary consumers. In our study, the epiphytic compartment is indeed significantly more concentrated in PUFA than seston. At the air-water interface, neuston is moreover characterized by important allochthonous organic matter accumulation. During a pollen rain, this organic matter represents an important source of carbon and PUFA for some microcrustacean species. In macrophytes littoral zones, c…
landing page: https://theses.hal.science/tel-00673430
identifier: NNT: 2011CLF22137
keyword: acide-gras-polyinsatures-agpi
keyword: eukaryotic-microorganisms
keyword: infoeu-reposemanticsdoctoralthesis
keyword: littoral-zones
keyword: macrophytes
keyword: microcrustaceans
keyword: microcrustaces
keyword: microorganismes-eucaryotes
keyword: polyunsaturated-fatty-acids-pufa
keyword: reseaux-trophiques
keyword: sdvsalife-sciences-q-bioagricultural-sciences
keyword: theses
keyword: trophic-webs
keyword: zones-littorales
issued: 2026-05-27T06:29:45.844460
modified: 2026-05-27T06:29:45.844467
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Diversity of trophic interactions between microorganisms and microcrustaceans in a macrophyte littoral zone : consequences for essential fatty acid transfer
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00673430
issued: 2026-05-27T06:29:45.872479
modified: 2026-05-27T06:29:45.774189