THE RELATIVE ABUNDANCE OF PUPAE OF THREE BLACK‐FLY SPECIES (<i>SIMULIUM</i> SPP.) ON DIFFERENT DIAMETERS OF STRINGS

Roberts, Derek

doi:10.1111/j.1570-7458.1983.tb03247.x

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…Natural substrates are difficult to standardize and, as a result, artificial substrates have been used to capture larvae. These include conical traps (Phillipson, 1956(Phillipson, , 1958Williams & Obeng, 1962;Johnson & Pengelly, 1966), polythene strips (Williams & Obeng, 1962;Pegel & Rihm, 1976;Gersabeck & Merritt, 1979;de Moor et al, 1986;Das etal., 1989), fabric (Tarshis, 1966), ceramic tiles (Lewis & Bennett, 1974, 1975Gersabeck & Merritt, 1979), spherical balls (Walsh etal., 1981) and string (Roberts, 1983(Roberts, , 1986. The effectiveness of a given substrate varies with the species tested.…”

Section: Introductionmentioning

confidence: 99%

Colonization of perspex strips by larvae of Austrosimulium bancrofti (Taylor) near Ipswich, Queensland

1991

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Larvae of the taxon Austrosimulium bancrofti (Taylor) were collected from perspex strips placed in rapids of the Brisbane River during January (summer) and October (spring). Separation of larvae according to the mixture approach to clustering demonstrated that: a) October cluster I larvae were larger and underwent an additional cluster to those collected in January, b) there was an additional cluster of larvae in each month, which correlated with the percentage of A. bancrofti Ipswich B that were identified cytologically, and c) greater numbers of later cluster larvae were collected from the strips than early clusters.Multivariate analysis demonstrated that distance from the lip of the rapids, strip texture and water velocity had a significant effect on the number of larvae colonizing perspex strips. Numbers increased with: a) decreasing distance from the lip of the rapids, b) increasing surface area of roughened strips and c) water velocity in the range 1.00 < X < 1.38 ms -. The influence of adult female oviposition behaviour, larval behaviour, sampling time and technique are discussed in relation to the parameters that influenced the colonization of artificial substrates.

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Section: Introductionmentioning

confidence: 99%

Colonization of perspex strips by larvae of Austrosimulium bancrofti (Taylor) near Ipswich, Queensland

1991

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“…They similarly differ in their preference for artificial substrates (Gersabeck & Merritt. 1979;Roberts, 1983Roberts, , 1986. Thus the substrate availability must have an important effect on their microdistribution in the river.…”

Section: Introductionmentioning

confidence: 99%

Microdistribution of immature African blackflies resulting from water velocity and turbulence preferences

Roberts

Okafor

1987

Medical Vet Entomology

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1. The velocity preferences of larval and pupal blackflies were studied experimentally by comparing the colonization of plastic strings placed in different velocity ranges; and also by investigating the simuliid microdistribution under natural conditions in the river. This required a novel method described for taking spot measurements of water velocity. 2. Simulium mcmahoni de Meillon, S. hirsutum Pomeroy and S. cervicornutum Pomeroy were most abundant in slow velocities (0.3-1.0 m s-1), S. colasbelcouri Grenier & Ovazza and S. hargreavesi Gibbins preferred 1.1-1.8 m s-1, S. squamosum Enderlein and S. vorax Pomeroy 1.9-2.2 m s-1. 3. The larvae of S. hargreavesi and S. cervicornutum preferred a higher velocity range compared with their pupae. 4. In moderate velocities (1.1-1.4 m s-1), the abundance of S. hargreavesi was greater under turbulent conditions than in smooth-flowing water, but this was reversed at very high velocities (2.3-2.6 m s-1). 5. Velocity had no apparent effect on substrate preference when substrates of different flexibilities were compared for three blackfly species. All avoided the most flexible substrates and preferred ones consisting of rigid articulating plates. Anisopteran predators were found to have a similar substrate choice.

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“…This is resulting from suitable micro-environments enhanced by the fast flow and turbulence created as the water flows down the rocky embankment down to the lowland plateau. It is also due to abundant suitable natural substrates which the immature forms of the vector colonize [13,14]. The ecological distribution of breeding sites of black flies is determined by the availability of fast flowing water body, presence of suitable substrates and levels of pollution in the ambient environment.…”

Section: Introductionmentioning

confidence: 99%

Substrate colonization and relative abundance of immature forms of black flies (Diptera: Simuliidae) in river Mada, Nasarawa State Nigeria

Uzoigwe¹,

Njoku²,

Amuga³

et al. 2013

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Black flies, vectors of Onchocerca volvulus, are known to colonize fast flowing sections of rivers. A study on aspects of ecology of immature forms of black flies was conducted at River Mada. Larvae and Pupae of the Genus: Simulium were prospected on natural substrates found at various water currents along the course of the river over a 12-month period. Larvae of six species and pupae of three species were identified colonizing different substrates in the river. A total of 443 larvae and 142 pupae were collected, and the peak month of collection was April. 405 (91.4%) larvae were identified as S. damnosum sl while 38 (8.6%) comprised S. adersi, S. hargreavesi, S. cervicornotum, S. bovis and S. vorax. 110 (77.5%) of the pupae collected were S. damnosum sl while 32 (22.5%) were S. adersi, and S. hargreavesi. The larvae unlike pupae appeared to be non discriminatory in substrate colonization and current preference. Paucity of the population of immature forms is observed and attributed primarily to scarcity of suitable substrates and other factors also discussed herein.

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THE RELATIVE ABUNDANCE OF PUPAE OF THREE BLACK‐FLY SPECIES (SIMULIUM SPP.) ON DIFFERENT DIAMETERS OF STRINGS

Cited by 6 publications

References 10 publications

Colonization of perspex strips by larvae of Austrosimulium bancrofti (Taylor) near Ipswich, Queensland

Colonization of perspex strips by larvae of Austrosimulium bancrofti (Taylor) near Ipswich, Queensland

Microdistribution of immature African blackflies resulting from water velocity and turbulence preferences

Substrate colonization and relative abundance of immature forms of black flies (Diptera: Simuliidae) in river Mada, Nasarawa State Nigeria

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