A cytological study of natural hybrids between Prosimulium multidentatum and P. magnum

Rothfels, Klaus; Nambiar, Ram

doi:10.1007/bf00285775

Cited by 23 publications

(9 citation statements)

References 22 publications

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“…hybrids (Rothfels 1979b;Rothfels and Nambiar 1981). It is irrelevant whether a structural rearrangement such as an inversion occurs on the X or the Y (a sexdifferential segment would be produced in either case), or whether the testis locus is embraced by the inversion as it occurs or is transposed to the inversion subsequently, to yield the population phenomenon termed "pseudopartial sex linkage" by Rothfels (1979b).…”

Section: Carson 1959)mentioning

confidence: 97%

“…The rare exceptions noted both by him and by us, as well as other rare sex chromosome exceptional or autosomally intermediate types, may in fact be hybrids or introgressants or they may represent the tails of the polymorphism distribution pattern of the pure siblings. That hybrids do occur in certain populations between even taxonomically good black fly species has been shown conclusively by Rothfels and Nambiar (1981) and Rothfels (1979b) for Prosimulium multidentatum x P. magnum, where hybridity can be demonstrated by chromocenter attachment of P. multidentatum chromosomes and failure to attach of P. magnum chromosomes.…”

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confidence: 91%

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The population structure of Simulium vittatum (Zett.): the IIIL-1 and IS-7 sibling species

Rothfels¹,

Featherston²

1981

Can. J. Zool.

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This paper describes two sibling species in Simulium vittatum (Zett.) on the basis of their salivary gland chromosomes. The IIIL-1 sibling is characterized by a Y chromosome carrying the IIIL-1 inversion; the IS-7 sibling is characterized by the IS-7 X chromosome. The basic banding sequences are identical in the two sibling species. The siblings differ however in the relative frequencies of standard and inverted sequences for a number of autosomal polymorphisms that they share. Standard sequences are predominant in the IIIL-1 sibling and inverted sequences in the IS-7 type. The IIIL-1 sibling is distributed from the Atlantic, south to the Gulf of Mexico and west to the Saskatchewan–Alberta border. The IS-7 sibling ranges from the Atlantic to Alaska, but so far has not been found south of Pennsylvania. The sibling species are sympatric over a wide zone extending through parts of Quebec, Ontario, and northeastern United States via Michigan, Wisconsin, and Minnesota to Saskatchewan and Alberta. It is argued that the two sibling species originated in the region of the present sympatry. Evidence for this conclusion derives from the geographic pattern of sex chromosome and autosome polymorphism in North America and from cytological characteristics of certain extraterritorial populations (Iceland).

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Section: Carson 1959)mentioning

confidence: 97%

mentioning

confidence: 91%

The population structure of Simulium vittatum (Zett.): the IIIL-1 and IS-7 sibling species

Rothfels¹,

Featherston²

1981

Can. J. Zool.

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“…The different location of the sex determining factors and/or the presence of different chromosome mechanism of sex determination (included male and female heterogamety), in related species or even in different populations of the same species, is a not infrequent phenomenon among the Diptera. Numerous examples of such a situation have been found, especially among the Simuliidae (RoTHFELS 1980;RoTHFELS and NAMBIAR 1981) and Chironomidae (HAGELE 1985;MARTIN 1966;MARTINet a/. 1980;MARTIN and LEE 1984;THOMPSON 1971), and the question of the mechanism involved is still waiting for a definitive answer.…”

Section: Discussionmentioning

confidence: 99%

Heterozygous Heterochromatin in Giemsa C-Banded Chromosomes ofClogmia Albipunctata(Telmatoscopus Albipunctatus) (Diptera: Psychodidae)

Troiano

1988

Caryologia

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SUMMARY -The mitotic and meiotic chromosomes of the moth fly Clog;nia albipunctata were analyzed using the Giemsa C-banding technique. Heterozygous centrometric bands were observed in four pairs of chromosomes, two of which seem to be exclusive of the male sex, showing the same heterozygous condition at the male meiosis. They are probably carrying the sex determining factors in a complex system of sex chromosome determination. This system is different from the one found in the polytene chromosomes of a Brazilian strain of the same species both in type and in location of the sex determining factors.

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“…Sex determination in the Simuliidae is of the XY type. Except for a number of Tahitian species (Rothfels 1979, Rothfels & Nambiar 1981, all published data indicate that males are the heterogametic sex. The X and Y chromosomes are not necessarily overtly differentiated.…”

Section: Taxonomic Backgroundmentioning

confidence: 99%

“…Such an inversion will occur in one sex only, resulting in the heterozygous configuration occurring only in that sex (usually the males -Rothfels 1979, Rothfels & Nambiar 1981. A partially sexlinked inversion will occur preferentially in the heterogametic sex.…”

Section: Zzzzzzzzzzzzzzzzzmentioning

confidence: 99%

Cytogenetics of New Zealand blackflies of the genusAustrosimulium(Diptera: Simuliidae) 1. The cytogenetics ofAustrosimulium australense

McLea

Lambert

1983

New Zealand Journal of Zoology

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This study undertakes a cytogenetic analysis of the New Zealand blackfly species Austrosimulium australense (Schiner). The principles of such an approach are outlined, and previous taxonomic studies of the genus Austrosimulium, in particular the taxonomic position of A. australense, are discussed. Populations from North Island localities covering a wide area were sampled and analysed for polymorphisms in the polytene chromosomes, taken from salivary glands of larvae. In all, 1018 larvae from 49 sites were analysed. A polytene chromosome map of A. australense is presented, with details of chromosomal inversions found in salivary gland cells. Three geographical zones are designated, according to the incidence of certain chromosomal polymorphisms.

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A cytological study of natural hybrids between Prosimulium multidentatum and P. magnum

Cited by 23 publications

References 22 publications

The population structure of Simulium vittatum (Zett.): the IIIL-1 and IS-7 sibling species

The population structure of Simulium vittatum (Zett.): the IIIL-1 and IS-7 sibling species

Heterozygous Heterochromatin in Giemsa C-Banded Chromosomes ofClogmia Albipunctata(Telmatoscopus Albipunctatus) (Diptera: Psychodidae)

Cytogenetics of New Zealand blackflies of the genusAustrosimulium(Diptera: Simuliidae) 1. The cytogenetics ofAustrosimulium australense

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