Skip to Main content Skip to Navigation
Theses

Version corrigée : Dynamique des habitats benthiques sοus cοntraintes anthrοpiques : Le cas du site de dépôt de dragage d'Οcteville

Abstract : The aim of this thesis is to assess the impact of dumping by Le Havre harbour on the faunistic and sedimentary environment near the Octeville dumping site (Eastern part of the bay of Seine). This thesis propose an original scientific approach, including an integrated view (1) by the use of geochemical markers coupled with a sedimentary study (2) a study of the spatial and temporal benthic macrofauna dynamics with an experimentation in situ (3) the creation of a new multicriteria specific indicator of the dumping pressure and (4) a study of the food web with the development of an ECOPATH model. On the one hand, the results showed the existence of a sedimentary equilibrium area in the north-west, with two opposite TOC gradients, controlled by tidal and swell. Harbour sediments can be identified by their different chemical compositions. The area impacted by the dumping is limited. On the other hand, the benthic macrofauna appears less impacted by the dumping. The community is adapted in the bio-hydro-sedimentary environment of the study area. Variations in abundance and dominance have been observed since 2003. In addition, a new indicator allows the classification of dumping impact. The food web is currently stable in both impacted and not impacted areas.
Complete list of metadatas

Cited literature [351 references]  Display  Hide  Download

https://hal-normandie-univ.archives-ouvertes.fr/tel-01967493
Contributor : Noémie Baux <>
Submitted on : Thursday, February 7, 2019 - 11:59:17 AM
Last modification on : Monday, April 27, 2020 - 4:26:30 PM

File

These.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01967493, version 2

Citation

Noémie Baux. Version corrigée : Dynamique des habitats benthiques sοus cοntraintes anthrοpiques : Le cas du site de dépôt de dragage d'Οcteville. Biodiversité et Ecologie. Université Caen Normandie, 2018. Français. ⟨tel-01967493v2⟩

Share

Metrics

Record views

112

Files downloads

62