Aspects of juvenile rainbow trout (<i>Oncorhynchus mykiss</i>) diet in relation to food supply during summer in the lower Tongariro River, New Zealand

Dedual, Michel; Collier, Kevin J.

doi:10.1080/00288330.1995.9516673

Cited by 21 publications

(24 citation statements)

References 26 publications

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“…However, density of these taxa only differed slightly between the Waipakihi and the lower Tongariro. Dedual and Collier (1995) also found small numbers of EPT in the benthos and drift of the lower section of the river. Of the EPT taxa, Plecoptera were most affected by the presence of dams with an order of magnitude lower density in the flow regulated sections of the river compared with the Waipakihi.…”

Section: Ephemeroptera Plecoptera and Trichopteramentioning

confidence: 89%

“…Previous studies have suggested that the presence of dams on the Tongariro River has lead to a change in the invertebrate communities below the dams as a result of changes in flow altering key variables such as food supply and substrate (Dedual and Collier, 1995;Collier, 2002). However, these studies have only examined potential dam effects with limited spatial replication.…”

Section: Introductionmentioning

confidence: 98%

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Invertebrate drift patterns in a regulated river: dams, periphyton biomass or longitudinal patterns?

Tonkin¹,

Death²,

Joy³

2009

River Research & Apps

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Macroinvertebrate drift was sampled at 15 sites along the Tongariro River, New Zealand above and below two hydroelectric dams. Sixty-seven invertebrate taxa were collected in the drift. Trichoptera (31) were the most diverse, followed by Diptera (13), Ephemeroptera (8) and Plecoptera (8). However, chironomidae were the numerically dominant taxa in the drift throughout the river and represented over 80% of all animals collected. Of these, Orthocladiinae and Diamesinae were the most abundant. Taxonomic richness declined with distance downstream and peaked at sites with intermediate levels of periphyton biomass. The per cent of Ephemeroptera, Plecoptera and Trichoptera (EPT) was 3-4 times higher in the unregulated section of the river and declined exponentially with both distance downstream and increase in periphyton biomass, but densities were similar along the river. Of the measured environmental variables periphyton biomass was most closely linked with drift community structure. Periphyton biomass was six times higher in the lower section of the river than the upper unregulated section. The autocorrelation between periphyton biomass and distance downstream complicates the interpretation of results. However, because of the distinct differences between above and below dam sections of river in periphyton biomass and the strong link between it and invertebrate drift we suggest that the alteration of flow patterns by the hydroelectric dams and the associated shift in periphyton biomass is the most likely explanation for invertebrate drift patterns in the river.

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Section: Ephemeroptera Plecoptera and Trichopteramentioning

confidence: 89%

Section: Introductionmentioning

confidence: 98%

Invertebrate drift patterns in a regulated river: dams, periphyton biomass or longitudinal patterns?

Tonkin¹,

Death²,

Joy³

2009

River Research & Apps

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“…Drift affects the recolonization of denuded habitats following disturbance (Townsend & Hildrew, 1976;Sagar, 1983) and strongly influences invertebrate community structure and composition (Hansen & Closs, 2007). One of the most important trophic consequences of variation in drift is to directly affect the availability of food for drift-feeding fishes (Elliott, 1967;Sagar & Glova, 1988;Dedual & Collier, 1995;Hayes et al, 2000), thereby influencing both habitat selection and individual growth (Hayes et al, 2007). Drift dynamics should also have a profound effect on fish production and the efficiency of transfer of primary consumer biomass to the fish trophic level.…”

Section: Introductionmentioning

confidence: 99%

Habitat effects on invertebrate drift in a small trout stream: implications for prey availability to drift-feeding fish

Leung

Rosenfeld²,

Bernhardt

2008

Hydrobiologia

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In this study, we focused on the drivers of micro-and mesohabitat variation of drift in a small trout stream with the goal of understanding the factors that influence the abundance of prey for drift-feeding fish. We hypothesized that there would be a positive relationship between velocity and drift abundance (biomass concentration, mg/m 3 ) across multiple spatial scales, and compared seasonal variation in abundance of drifting terrestrial and aquatic invertebrates in habitats that represent the fundamental constituents of stream channels (pools, glides, runs, and riffles). We also examined how drift abundance varied spatially within the water column. We found no relationship between drift concentration and velocity at the microhabitat scale within individual pools or riffles, suggesting that turbulence and short distances between high-and low-velocity microhabitats minimize changes in drift concentration through settlement in slower velocity microhabitats. There were also minimal differences in summer low-flow drift abundance at the mesohabitat scale, although drift concentration was highest in riffle habitats. Similarly, there was no differentiation of drifting invertebrate community structure among summer samples collected from pools, glides, runs, and riffles. Drift concentration was significantly higher in winter than in summer, and variation in drift within individual mesohabitat types (e.g., pools or riffles) was lower during winter high flows. As expected, summer surface samples also had a significantly higher proportion of terrestrial invertebrates and higher overall biomass than samples collected from within the water column. Our results suggest that turbulence and the short length of different habitat types in small streams tend to homogenize drift concentration, and that spatial variation in drift concentrations may be affected as much by fish predation as by entrainment rates from the benthos.

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“…These groups also dominate drift communities in other New Zealand rivers ( & Glova 1992), and species in these orders are important in the diets of drift-feeding fish (Dedual & Collier 1995;Sagar & Glova 1995). Similarly, these groups have been shown to be important drifting orders in international studies (Elliott 1967b;Radford & Hartland-Rowe 1971;Brittain & Eikeland 1988;Mathooko & Mavuti 1992;.…”

Section: Comparison Of Taxonomic Compositionmentioning

confidence: 99%

“…Drifting invertebrates are of interest because of their importance as food for fish (Elliott 1967a(Elliott , 1970Waters 1969;Sagar & Glova 1988;Dedual & Collier 1995;Hayes et al 2000;McIntosh 2000), their role in benthic invertebrate community recolonisation and production (Waters 1972;Sagar 1983), and potential as a useful measure of water quality (Chutter 1975;. Invertebrate drift productivity of a river is particularly important for modelling net rate of energy intake (NREI) of drift-feeding fish to predict growth and habitat selection (Hayes et al 2000;Guensch et al 2001)-models that are playing an increasingly important role in fish ecology (Hughes et al in press).…”

Section: Introductionmentioning

confidence: 99%

Relationships between drifting and benthic invertebrates in three New Zealand rivers: Implications for drift‐feeding fish

Shearer¹,

Stark

Hayes

et al. 2003

New Zealand Journal of Marine and Freshwater Research

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We assessed whether taxonomic structure and density of aquatic drift could be predicted from the benthos in three New Zealand rivers. The three main orders contributing to both the benthos and drift were Ephemeroptera, Diptera, and Trichoptera. Drift and benthic densities for all taxa and all rivers combined were not significantly correlated (adults inclusive and exclusive). There were significant positive correlations between benthic and drift densities for the three main drifting orders-Ephemeroptera, Diptera, and Trichoptera when data from all rivers were combined. However, these relationships were not always detected in individual rivers. The propensity for Deleatidium to drift was negatively related to chlorophyll a concentration; suggesting density-dependent drift mediated by food limitation. Drift was reduced when periphyton chlorophyll a concentration was high in relation to benthic Deleatidium density. This highlights an unexpected effect of periphyton proliferation on invertebrate drift and drift-feeding fishes. Despite finding some correlations between benthic and drifting communities, defining general relationships between benthic and drifting communities is challenging given the complexity of density-dependent and densityindependent mechanisms that influence invertebrate drift.

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Aspects of juvenile rainbow trout (Oncorhynchus mykiss) diet in relation to food supply during summer in the lower Tongariro River, New Zealand

Cited by 21 publications

References 26 publications

Invertebrate drift patterns in a regulated river: dams, periphyton biomass or longitudinal patterns?

Invertebrate drift patterns in a regulated river: dams, periphyton biomass or longitudinal patterns?

Habitat effects on invertebrate drift in a small trout stream: implications for prey availability to drift-feeding fish

Relationships between drifting and benthic invertebrates in three New Zealand rivers: Implications for drift‐feeding fish

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