Skip to Main content Skip to Navigation
Journal articles

Using stable isotope approach to quantify pond dam impacts on isotopic niches and assimilation of resources by invertebrates in temporary streams: a case study

Abstract : Fishponds built across streams can greatly affect their functioning, especially through loss of ecological continuity but also changes in water availability and trophic resources. Yet, their consequences on communities and stream functioning remain largely understudied. We investigated effects of fishpond dams on the trophic ecology of macroinvertebrate communities in temporary low-order streams using C and N stable isotopes. Food resources and macroinvertebrates were sampled in one upstream and one downstream site of two temporary streams, one stream without (reference stream) versus one with a fishpond (impacted stream) and used for isotopic analyses. Results suggested moderate effects of fishponds on the upstream tributaries. In contrast, at the downstream impacted site, ten times higher macroinvertebrate biomass and modifications in the trophic niches were recorded, likely due to changes in resource availability/quality and dam-related hydrology. By modifying the food sources as well as water fluxes, fishpond dams tend to alter macroinvertebrate communities but also shift the trophic dynamics downstream. This assessment stresses the need for exploring their impacts on food webs and nutrient fluxes at larger downstream distances to better understand their effects before drawing conclusions in regard to their management.
Document type :
Journal articles
Complete list of metadata

https://hal.inrae.fr/hal-02624939
Contributor : Migration Prodinra <>
Submitted on : Tuesday, May 26, 2020 - 12:58:00 PM
Last modification on : Friday, March 12, 2021 - 2:38:26 PM

Identifiers

Citation

Brian Four, Marielle Thomas, Michael Danger, Nicolas Angeli, Marie-Elodie Perga, et al.. Using stable isotope approach to quantify pond dam impacts on isotopic niches and assimilation of resources by invertebrates in temporary streams: a case study. Hydrobiologia, Springer, 2019, 834 (1), pp.163-181. ⟨10.1007/s10750-019-3920-0⟩. ⟨hal-02624939⟩

Share

Metrics

Record views

96