Mechanisms of fine particle capture by larval black flies (Diptera: Simuliidae).

Larval black flies remove fine particulate matter from stream water using a mucosubstance which coats their filtering organs (cephalic fans). This mechanism, common among filter feeding marine invertebrates, but not previously reported in freshwater insects, explains how simuliids capture fine particles (0.091 – ca. 30 μm) which would otherwise escape the cephalic fans. Investigations of two theoretical filter feeding models revealed that direct interception is probably the predominant mode of fine particle filtration for black flies. The ability of simuliids to capture fine particles, which are abundant in many streams and often support a rich nutritive microflora, may account in part for their occurrence and success in diverse lotic habitats.

[1]  I. Puri.  On the Life-History and Structure of the Early Stages of Simuliidae (Diptera, Nematocera). Part I , 1925, Parasitology.

[2]  Joseph B. Franzini,et al.  Fluid Mechanics with Engineering Applications. 6th Ed. By R. L.DAUGHERTY and J. B. FRANZINI. McGraw-Hill. 1965. 574 pp. $9.95 or 80s. Fluid Dynamics. By J. W. DAILY and D. R. F. HARLEMAN. Addison Wesley. 1966. 454 pp. $12.50 or 94s. , 1967, Journal of Fluid Mechanics.

[3]  H. Hynes,et al.  THE FORMATION OF PARTICLES IN FRESHWATER LEACHATES OF DEAD LEAVES1 , 1973 .

[4]  J. B. Wallace,et al.  Fine Particle Suspension-Feeding Capabilities of Isonychia spp. (Ephemeroptera: Siphlonuridae) , 1979 .

[5]  C. Jørgensen,et al.  Biology of Suspension Feeding , 1968 .

[6]  D. C. Erman,et al.  Fine particulate organic carbon output from fens and its effect on benthic macroinvertebrates , 1979 .

[7]  Hans W. Paeri.  Bacterial uptake of dissolved organic matter in relation to detrital aggregation in marine and freshwater systems1 , 1974 .

[8]  S. Ulfstrand,et al.  LACUSTRINE SESTON AND OTHER FACTORS INFLUENCING BLACKFLIES (DIPTERA SIMULIIDAE) INHABITING LAKE OUTLETS IN SWEDISH LAPLAND , 1977 .

[9]  D. Craig,et al.  The seven larval instars of Prosimulium mixtum Syme and Davies and P. fuscum Syme and Davies (Diptera: Simuliidae) , 1979 .

[10]  P. Armitage.  A quantitative study of the invertebrate fauna of the River Tees below Cow Green Reservoir , 1976 .

[11]  K. Cummins,et al.  Structure and Function of Stream Ecosystems , 1974 .

[12]  J. Maciolek,et al.  Microseston Dynamics in a Simple Sierra Nevada Lake‐Stream System , 1968 .

[13]  M. Lock,et al.  Colloidal organic carbon in running waters , 1977 .

[14]  F. J. H. Fredeen.  BACTERIA AS FOOD FOR BLACKFLY LARVAE (DIPTERA: SIMULIIDAE) IN LABORATORY CULTURES AND IN NATURAL STREAMS , 1964 .

[15]  R. Wotton.  Evidence that blackfly larvae can feed on particles of colloidal size , 1976, Nature.

[16]  E. Strickland.  SOME PARASITES OF SIMULIUM LARVÆ AND THEIR EFFECTS ON THE DEVELOPMENT OF THE HOST , 1911 .

[17]  C. Cushing.  Filter-feeding Insect Distribution and Planktonic Food in the Montreal River , 1963 .

[18]  M. Labarbera.  Particle Capture by a Pacific Brittle Star: Experimental Test of the Aerosol Suspension Feeding Model , 1978, Science.

[19]  D. Craig.  Mouthparts and feeding behaviour of Tahitian larval Simuliidae (Diptera: Nematocera) , 1977 .

[20]  W. A. Corpe.  CHAPTER 4 – ATTACHMENT OF MARINE BACTERIA TO SOLID SURFACES , 1970 .