Drift of Ephemeroptera and Plecoptera in Two Colorado Rivers

Stewart, Kenneth W.; Szczytko, Stanley W.

doi:10.2307/1467086

Cited by 19 publications

(10 citation statements)

References 17 publications

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“…However, Z. haysi, Prosimulium and the Chironomidae showed a significant positive correlation between 24 h drift density and discharge (Table 2). Interestingly, my estimates are considerably greater than Stewart & Szczytko (1983) report for the similar fauna of the nearby, larger Gunnison River. Bournard & Thibault (1973) suggested that most estimates of drift density fall between 10 and 100 per 100 m 3 , although they recognize that these values are highly variable.…”

Section: Discussioncontrasting

confidence: 75%

Macroinvertebrate drift in a Rocky Mountain stream

Allan

1987

Hydrobiologia

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An extensive series of drift collections from a Rocky Mountain stream was used to investigate quantitative patterns in the taxonomic composition of drift throughout spring, summer and fall for 1975-1978. Drift was estimated by drift rate, the number of organisms drifting past a point per 24 h; and by drift density, the numbers of organisms collected per 100 m 3 of water sampled.Drift densities were up to ten times greater by night than by day, and 24 h drift densities for the total fauna approached 2000 per 100 m 3 in June-July, declining to <500 by autumn. Ephemeroptera, and especially Baetis, dominated the drift. Drift rates were greatest in late spring, around 106 per 24 h, which are among the highest values reported for small trout streams. Drift rates declined to <105 during the summer, and shifts in the taxonomic composition are described.Multiple regression analysis of the relationship between drift rate and density, and the independent variables discharge, benthic density and temperature, showed that discharge typically was a significant predictor of 24 h drift rate, usually the best single predictor. In contrast, 24 h drift density most frequently was independent of discharge, indicating that this measure tends to correct for seasonal variation in discharge, as suggested in the literature. However, this was not invariably true. Drift density significantly correlated with benthic density in five of eight taxa inspected, thus seasonal declines in the benthos probably accounted for parallel declines in drift density.

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Section: Discussioncontrasting

confidence: 75%

Macroinvertebrate drift in a Rocky Mountain stream

Allan

1987

Hydrobiologia

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“…Allan (1978) suggested avoidance of predation by visual feeding fish (which select larger individuals) as a causitive mechanism, based on observations of Baetis bicaudatus and a salmonid predator. Additional studies by Allan (1984), Stewart & Szczytko (1983) and Skinner (1985) are supportive. Skinner's work was based partly on B. tricaudatus, the dominant baetid mayfly in our study.…”

Section: Discussionmentioning

confidence: 64%

Upstream-downstream movements of aquatic invertebrates in a Rocky Mountain stream

Bergey

Ward

1989

Hydrobiologia

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Simultaneous collections of drift and organisms moving either upstream or downstream in association with the substrate were made using a specially designed sampler. Samples were taken in a die1 series along a transect across the study riffle of a Colorado foothills stream on six dates over an annual cycle. In addition to longitudinal movements, taxonomic composition and die1 periodicity were evaluated. The insect-dominated fauna showed a net downstream displacement. Only the caddisflies Helicopsyche borealis and Hesperophylax occidentalis exhibited net upstream movement, primarily a result of low drift frequencies. The taxonomic composition of moving invertebrates differed from that of the benthos. Drift resembled downstream moving substrate-associated invertebrates in composition, but differed from that of the upstream directed fauna. Taxa collectively exhibited four types of die1 patterns: 1) similar downstream (drift and substrate-associated movements) patterns, which generally differed from the upstream pattern; 2) similar benthic (upstream and downstream) patterns, which differed from that of drift; 3) aperiodic patterns; and 4) independent patterns for each type of directional movement. Analysis of size classes based on head capsule width for the maytly Baetis tricaudatus showed significantly smaller size in stationary individuals compared with moving individuals in the population and revealed that nymphs moving during the day were smaller than those moving at night.

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“…The mature nymphs (size class 12) drift more readily than others (27 times more, Table 2). Such behaviour at the end of nymphal growth has been observed in Baetidae (Muller 1966), and it has generally been suggested that larger nymphs have a greater tendency to drift, particularly during periods of high growth (Elliott 1967;Hall et al 1980;Stewart and Szczytko 1983). This probably also explains at least in part the high drift rates of the nymphs of cohort 2 in early spring (April to mid-May).…”

Section: Driftmentioning

confidence: 67%

Life history and production of the stream-dwelling mayfly Habrophlebia vibrans Needham (Ephemeroptera; Leptophlebiidae)

Lauzon¹,

Harper²

1986

Can. J. Zool.

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1986. Life history and production of the stream-dwelling mayfly Habrophlebia vibrans Needham (Ephemeroptera; Leptophlebiidae). Can. J . Zool. 64: 2038-2045. Habrophlebia vibrans in QuCbec has a 2-year cycle, a feature unexpected in a small mayfly and unreported in Leptophlebiidae. Emergence (875/m2) occurred in June and was synchronous. Ovipositing females concentrated upstream (239 5 94.7 eggslfemale). Eggs hatched within 3 weeks. In summer, nymphs reached densities of 27 500/m2 and a size of 1.65 mm. During the next 18 months, densities decreased (4000-9500/m2). After a year, nymphs were 2.1 mm long and reached 3 mm at the end of their second summer. The final size (5.0 mm) was attained in the last weeks before emergence, and mean densities then were 648/m2. Nymphs lived on gravel where they preferred larger particles and scanty detritus. Drift occurred in small nymphs during August of their 1st year, in larger nymphs during spring runoff, and in mature nymphs at emergence. This resulted in a concentration of emergence in the lower reaches. Annual production was 7 10-829 mg/m2 and the production to biomass ratio was 2.5-3.2. About three-quarters of the production was due to the 2nd-year cohort, and one-half was accumulated during the last 2 months. No constant relation was found between production and drift and between production and emergence. LAUZON, M., et P. P. HARPER. 1986. Life history and production of the stream-dwelling mayfly Habrophlebia vibrans Needham (Ephemeroptera; Leptophlebiidae) . Can. J . Zool . 64: 2038-2045. Habrophlebia vibrans posdde au QuCbec un cycle de 2 ans, une caractkristique inattendue chez une petite CphCmere et inconnue chez les Leptophlediidae. L'Cmergence (875/m2) en juin est synchrone. Les femelles se rassemblent a l'amont et pondent 239 i 94,7 oeufs. Les oeufs Cclosent en moins de 3 semaines. Les larves atteignent des densitCs de 27 500/m2 et en septembre elles mesurent 1,65 mm. Pendant les 18 mois suivants, les densites diminuent (4000-9500/m2). Les larves de 1 an mesurent 2,l rnrn et, aprks leur second CtC, elles atteignent 3,O mm. Elles parviennent A leur taille finale de 5,O mm juste avant 1'Cmergence; les densitCs sont alors de 648/m2. Les larves vivent sur le gravier ou elles prCfkrent les particules grossieres et les faibles accumulations de dCtritus. La dCrive affecte les petites larves en aoQt de leur premier CtC, les larves plus grandes durant la crue et les larves prCtes A Cmerger. La production est de 710-829 mg/m2 et le rapport production/biomasse se situe entre 2,5 et 3,2.Les trois-quarts de la production se rCalisent dans la cohorte de 2" annCe et la moitiC durant les 2 derniers mois. I1 n'existe pas de relation constante entre la production et la derive et entre la production et ]'emergence.

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Drift of Ephemeroptera and Plecoptera in Two Colorado Rivers

Cited by 19 publications

References 17 publications

Macroinvertebrate drift in a Rocky Mountain stream

Macroinvertebrate drift in a Rocky Mountain stream

Upstream-downstream movements of aquatic invertebrates in a Rocky Mountain stream

Life history and production of the stream-dwelling mayfly Habrophlebia vibrans Needham (Ephemeroptera; Leptophlebiidae)

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