Surface and hyporheic oligochaete assemblages in a French suburban stream

Lafont, M.; Vivier, Anne; Nogueira, S.; Namour, Philippe; Breil, Pascal

doi:10.1007/1-4020-5368-1_17

Cited by 3 publications

(2 citation statements)

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“…Calculations were carried out for (a) all oligochaetes, (b) stygophiles, and (c) stygobites. Groups based on functional traits were defined as: (a) FTR1 for species associated with coarse sediments poor in organic matter, highly permeable, well oxygenated and with consistent vertical exchanges, (b) FTR4 for species living in fine sediments, rich in organic matter, with low oxygen content and weak vertical exchanges, and (c) FTRi for species feeding on algae and living in sediments closely related to the surface, with intermediate levels of organic matter and oxygen contents (Lafont et al, 2006). The percentages of individuals in these ecological groups were compared using Chi 2 tests.…”

Section: Methodsmentioning

confidence: 99%

“…Based on their ecological requirements, species can be assigned to stygoxenes (restricted to surface water and rarely occurring inside hyporheic sediments), stygophiles (living in both surface and hyporheic zones), or stygobites (restricted to groundwater; Marmonier, Vervier, Gibert, & Dole‐Olivier, 1993). They may also be classified according to their functional traits (FTR groups; Lafont & Vivier, 2006) based on their trophic requirements or their environmental requirements (sediment grain sizes or river‐groundwater exchanges; Lafont et al, 1996; Lafont, Vivier, Nogueira, Namur, & Breil, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Are hyporheic oligochaetes efficient indicators of hydrological exchanges in river bed sediment? A test in a semi‐natural and a regulated river

Châtelliers

Dolédec

Lafont

et al. 2020

River Research & Apps

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River‐groundwater exchanges are crucial for several ecological processes, but difficult to localize. Hyporheic oligochaetes may represent efficient biological indicators of these exchanges, but hydrological disturbance may alter oligochaete distribution and blur the spatial patterns of river‐groundwater exchanges. Oligochaete assemblages were compared in the Drôme River, which is a semi‐natural braided river with an unmodified discharge, and the Ain River, which has reduced sediment mobility and hydropeaking due to several upstream dams. In the semi‐natural river, the oligochaete distribution was mostly controlled by the origin of the water: some stygoxene species (e.g., Chaetogaster spp. and Vejdovskyella intermedia) were restricted to or more abundant in downwellings, whereas a set of stygophiles (e.g., Stylodrilus sp. and Cernovitoviella sp.) and stygobites (e.g., Aberrantidrilus cuspis) were present or more abundant only in upwellings. Species living in fine sediment (e.g., Potamothrix sp. and Tubifex sp.) also occurred in upwellings due to their location at the border of the braided strip. Conversely, in the regulated river, oligochaete assemblages were abundant and diversified, with species living in fine sediment being dominant in the partially clogged stations. The spatial distribution of most species did not follow typical surface‐hyporheic exchange patterns: most stygophiles (e.g., Proppapus volki and Marionina argentea) and some stygobites (e.g., Haber turquini) were found in both upwellings and downwellings or even at stations without water exchanges (e.g., Rhyacodrilus balmensis). In rivers subjected to hydrological disturbance and hydropeaking, oligochaetes became poor indicators of river‐groundwater exchanges.

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Section: Methodsmentioning

confidence: 99%