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CYTOGENETICS OF THE SIMULIUM VENUSTUMIVERECUNDUM COMPLEX (DIPTERA: SIMULIIDAE) ON THE AVALON PENINSULA, NEWFOUNDLAND

Published online by Cambridge University Press:  31 May 2012

John W. McCreadie ,
Peter H. Adler  and
Murray H. Colbo
John W. McCreadie
Affiliation:
Department of Entomology, Clemson University, Clemson, South Carolina, USA 29634-0365
Peter H. Adler
Affiliation:
Department of Entomology, Clemson University, Clemson, South Carolina, USA 29634-0365
Murray H. Colbo
Affiliation:
Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1B 3X9
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Abstract

Results are presented for a 4-year (1986–1989) cytological survey of the Simulium venustum/verecundum complex on the Avalon Peninsula, Newfoundland, Canada. Based on 4578 larval identifications from 72 sites, six species in the S. venustum/verecundum complex were found: S. truncatum Lundström (= S. venustum EFG/C), S. venustum CC2, S. venustum CC3, S. venustum AC(gB), S. verecundum Stone and Jamnback (= S. verecundum AA), and S. rostratum Lundström (= S. verecundum ACD). The possibility that S. venustum A/C and S. venustum Say (= S. venustum CC) exist on the Avalon Peninsula in low numbers cannot be excluded, although this is doubtful. Discoveries of EFG/C and CC2 reciprocal sex exceptions support the hypothesis that exceptional individuals are the product of crossover. Cytological results confirm the supposition that S. truncatum, S. venustum CC2, S. venustum CC3, S. venustum AC(gB), S. verecundum AA, and S. rostratum are all distinct species. Results are interpreted within the broader geographic context of the S. venustum/verecundum complex. Three new cytotypes are recognized: one, from Quebec, we place under AC(gB); the other two, from the eastern United States, fall under CC2.

Résumé

Les résultats présentés ici sont ceux d’une étude de la cytologie des simulies du complexe Simulium venustum/verecundum de la péninsule d’Avalon, Terre-Neuve, Canada (1986–1989). La détermination de 4578 larves trouvées en 72 points a révélé la présence de six espèces du complexe : S. truncatum Lundstrom (= S. venustum EFG/C), S. venustum CC2, S. venustum CC3, S. venustum AC(gB), S. verecundum Stone et Jamnback (= S. verecundum AA) et S. rostratum Lundstrom (= S. verecundum ACD). La possibilité de la présence de petits nombres de S. venustum A/C et de S. venustum Say (= S. venustum CC) dans la péninsule ne peut être exclue, mais elle est peu probable. La découverte d’individus EFG/C et de CC2 exceptionnels, résultats de translocations réciproques des chromosomes sexuels, appuie l’hypothèse selon laquelle les individus exceptionnels sont le produit de rétrocroisements. Les résultats de l’analyse cytologique confirment que S. truncatum, S. venustum CC2, S. venustum CC3, S. venustum AC(gB), S. verecundum AA et S. rostratum sont toutes des espèces distinctes. Les résultats sont examinés dans le contexte de la répartition géographique du complexe S. venustum/verecundum. Trois nouveaux cytotypes sont reconnus : l’un au Québec correspond à AC(gB), les deux autres, de l’est des États-Unis, correspondent à CC2.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 1 , February 1994 , pp. 23 - 30
Copyright
Copyright © Entomological Society of Canada 1994

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