Quantification of diet variability in a stream amphipod: implications for ecosystem functioning

Felten, Vincent; Tixier, Guillaume; Guérold, François; Billy, Vincent; Dangles, Olivier

doi:10.1127/1863-9135/2008/0170-0303

Cited by 41 publications

(39 citation statements)

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“…The gammarids likely increased consumption of the water moss, F. antipyretica, in the period when biomass of diatoms became insufficient to meet their food requirements. Thus, our data support the conclusion of Felten et al [7] that bryophytes can be a food item of amphipods, but specify that the importance of bryophytes increases in periods of shortcoming of the main foodstuff, i.e., diatoms. McWilliam-Hughes et al [30] also concluded that bryophytes might be an important alternate (marginal) food source for aquatic macroinvertebrates when a preferred food (e.g., diatoms) is scarce.…”

Section: Discussionsupporting

confidence: 80%

“…Many studies have reported the direct consumption of aquatic bryophytes, including F. antipyretica, by some taxa of benthic invertebrates [1, 6,13]. Among the zoobenthos, gammarids are known to be highly opportunistic feeders capable of predation, and can also collect detritus, scrape periphytic microalgae and leaf litter, and graze on aquatic macrophytes [7,[31][32][33]. Although gammarids, E. viridis, at the studied site evidently had a high degree of predation ( Figure 5) and thereby might get the acetylenic acids through their prey, we suggest that they consumed bryophyte particles directly.…”

Section: Discussionmentioning

confidence: 99%

“…Phenolic compounds are widely thought to reduce the palatability of aquatic bryophytes, thus preventing their consumption [1]. However, a microscopic gut content analysis recently found that some zoobenthic taxa eat more bryophytes than previously expected [6,7]. Nevertheless, this method is known to have some shortcomings; for example, many ingested particles are not digested and assimilated (e.g., [8][9][10]).…”

Section: Introductionmentioning

confidence: 99%

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Water moss as a food item of the zoobenthos in the Yenisei River

Kalachova

Gladyshev²,

Sushchik³

et al. 2011

Open Life Sciences

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Abstract:Bryophytesareabundantinstreamsandareahabitatformanyinvertebrates,buttheircontributiontothedietoffluvialzoobenthos is still debated. To estimate the amount of bryophyte-derived organic matter assimilated by benthic invertebrates, we used a combinationoffattyacidandstableisotopeanalysesduringafour-yearmonthlystudyofalittoralsiteintheYeniseiRiver(Siberia, Russia).Acetylenicacids,whicharehighlyspecificbiomarkersofthewatermossFontinalis antipyretica,werefoundinlipidsof all dominant benthic animals: gammarids, ephemeropterans, chironomids and trichopterans. The dominant zoobenthic species, Eulimnogammarus viridis, had maximum levels of the biomarkers in its biomass during winter, and minimum levels in summer. The zoobenthos in the studied site regularly consume and assimilate bryophyte-derived organic matter as a minor supplemental food.Thisconsumptionincreasesinwinter,whenthemainfoodsourceofthezoobenthos,epilithicbiofilms,areprobablyscarce.©VersitaSp.zo.o.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water moss as a food item of the zoobenthos in the Yenisei River

Kalachova

Gladyshev²,

Sushchik³

et al. 2011

Open Life Sciences

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“…This means that the predatory impact of D. villosus is determined by local and seasonal conditions determining increasing allometric growth differences between both sexes, including temperature and food availability. Felten et al (2008b) carried out a study on the diet of G. fossarum in streams, which indicated its main role as collector and shredder. However, animal food was taken up by the larger specimens (6-8 mm) and was evident in submersed root and bryophyte but not in detrital pool habitats.…”

Section: Discussionmentioning

confidence: 99%

Environmental and morphological factors influencing predatory behaviour by invasive non-indigenous gammaridean species

et al. 2009

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Predatory behaviour seems to be more frequent in invasive gammaridean species than in native ones. This results in the exclusion of other, mostly native gammaridean species and a change in benthic communities. The present study analysed the influence of environmental factors (water temperature) and morphological factors (sex, body parts involved in catching and holding prey) on the predatory behaviour of Dikerogammarus villosus. A diet study of invasive relatives of D. villosus showed that predation intensity is especially high in spring and summer, that is, at increasing and high temperatures. Experiments with D. villosus in climate rooms at various temperatures, using the native Gammarus fossarum as prey, showed that the average predation rate by both sexes gradually increased over the temperature range from 5 to 30°C. Natural mortality during the experiments was negligible compared to losses due to predation. At each temperature, the predation rate by females was lower than that by males. Males showed a steep allometric growth of body parts involved in the process of catching and holding prey, compared to females at increasing body size in a number of measurements. This may explain the difference in predatory behaviour between males and females, which plays a role in intraguild predation a supposed mechanism for species displacement.

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“…They shred the material and, therefore, make it available for the decomposers and filterers in the stream system (Cummins and Klug, 1979). Thus, G. pulex accomplishes an important role by linking the energetic transport from the terrestrial to the aquatic system (Cummins and Klug, 1979;Graça et al, 2001;Felten et al, 2008a). At the same time, G. pulex may behave as a predator and as a cannibal (MacNeil et al, 1997;Kelly et al, 2002).…”

Section: Study Speciesmentioning

confidence: 99%

From population-level effects to individual response: modelling temperature dependence in Gammarus pulex

Moenickes

Schneider

Mühle

et al. 2011

Journal of Experimental Biology

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SUMMARYPopulation-level effects of global warming result from concurrent direct and indirect processes. They are typically described by physiologically structured population models (PSPMs). Therefore, inverse modelling offers a tool to identify parameters of individual physiological processes through population-level data analysis, e.g. the temperature dependence of growth from size-frequency data of a field population. Here, we make use of experiments under laboratory conditions, in mesocosms and field monitoring to determine the temperature dependence of growth and mortality of Gammarus pulex. We found an optimum temperature for growth of approximately 17°C and a related temperature coefficient, Q 10 , of 1.5°C -1 , irrespective of whether we classically fitted individual growth curves or applied inverse modelling based on PSPMs to laboratory data. From a comparison of underlying data sets we conclude that applying inverse modelling techniques to population-level data results in meaningful response parameters for physiological processes if additional temperature-driven effects, including within-population interaction, can be excluded or determined independently. If this is not the case, parameter estimates describe a cumulative response, e.g. comprising temperature-dependent resource dynamics. Finally, fluctuating temperatures in natural habitats increased the uncertainty in parameter values. Here, PSPM should be applied for virtual monitoring in order to determine a sampling scheme that comprises important dates to reduce parameter uncertainty. Supplementary material available online at

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Quantification of diet variability in a stream amphipod: implications for ecosystem functioning

Cited by 41 publications

References 0 publications

Water moss as a food item of the zoobenthos in the Yenisei River

Water moss as a food item of the zoobenthos in the Yenisei River

Environmental and morphological factors influencing predatory behaviour by invasive non-indigenous gammaridean species

From population-level effects to individual response: modelling temperature dependence in Gammarus pulex

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