School of BioSciences - Research Publications

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Type: Journal Article × End date: 1979 × Author: Martin, Jon ×

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    Review of the genus Chironomus (Diptera: Chironomidae). VI. Cytology of the Chironomus maturus complex.
    Wuelker, W ; Martin, J (Natural Sciences Research Institute, Eastern New Mexico University, 1974)
    Two species, Chironomus maturus Johannsen and Chiron- omus whitsell Sublette and Sublette, having the chromosome arm combination AF, BE, CD, and G, are described. An evolutionary relationship to an ancestral group of the thummi- and pseudothummi- complexes as well as the parathummi-complex is postulated.
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    On the Origin of Inversion Polymorphism
    Martin, J (University of Chicago Press, 1969-05)
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    A review of the genus Chironomus (Diptera: Chironomidae). II. Added descriptions of Chironomus cloacalis Atchley and Martin from Australia.
    MARTIN, J (Natural Sciences Research Institute, University of Eastern New Mexico, 1971)
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    Biometrical effects of the inversion polymorphism of Kiefferulus intertinctus (Skuse)
    Martin, J (CSIRO, 1973-01-01)
    The Lonsdale, Barwon, and Corio inversions of K. intertinctus produce biometrical effects in larvae. The Lo, Ba, and Co sequences all increase the length of the ventral tubules in both male and female larvae. This effect may help in understanding the basis of the non-random association between the Lonsdale and Barwon inversions. La and Ba, whose occurrence together is advantageous, are more common in warmer regions where the oxygen content of the water is low. Larger ventral tubules provide an increased area for respiratory exchange. In addition, the inversions probably also affect larval length. The Lo, Ba, and Stco sequences apparently decrease the length of female larvae but increase the length of male larvae. © 1973 ASEG.
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    Chromosomes as tools in taxonomy and phylogeny of Chironomidae (Diptera).
    MARTIN, J (Societas Entomologica Scandinavica,, 1979)
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    A review of the genus Chironomus (Diptera, Chironomidae) IX. The cytology of Chironomus tepperi Skuse
    MARTIN, J (Springer, 1974-03)
    Analysis of the banding pattern of the salivary gland chromosomes of Chironomus tepperi indicates that, despite a somewhat modified male hypopygium, the relationships of this species are close to the other Australian species of the genus, particularly to Ch. oppositus. No inversion polymorphism has been found in Ch. tepperi and this, together with the relatively high chiasma frequency as measured at metaphase I, would appear to be an adaptation to provide genetic variability necessary for its colonizing ability.
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    INVERSION POLYMORPHISM INCHIRONOMUS STAEGERILUNDBECK
    Martin, J ; Wülker, W (Canadian Science Publishing, 1971-06-01)
    Populations of Chironomus staegeri are polymorphic for inversions in six chromosome arms. Many of these inversions do not conform to Hardy-Weinberg expectation, often with a significant deficiency of heterozygotes. Many combinations of the inversions two-at-a-time show a significant deviation from random assortment. Often this is due to the occurrence together in the same individual of rare sequences, but others, such as the association of sequences A1and C1, A2and C2, and A2and B4appear to be real effects.There is a marked dimorphism in the inversion sequences present in populations from deep water and those from shallow water in the northeastern U.S.A. and Canada. This may be associated with ability to withstand winter freezing.It is possible that a process of speciation, leading eventually to three different species, is in progress and a considerable degree of reproductive isolation may have already been achieved.
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    A morphometric analysis of differential sexual dimorphism in larvae of Chironomus (Diptera)
    Atchley, WR ; Martin, J (Entomological Society of Canada, 1971-01-01)
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    The salivary gland chromosomes of chironomus oppositus walker (Diptera: Nematocera)
    Martin, J (CSIRO Publishing, 1969-01-01)
    Chromosome maps for C. oppositus, which are intended to serve as a standard for the genus Chironomus in the Australasian region, are presented. This species possesses the usual four salivary gland chromosomes and the seven arms, named A-G by Keyl (1962), can be recognized. This species has the combination AE, BF, CD, G, corresponding to the pseudothummi group of Europe. The relationship of C. oppositus to European species of the pseudothummi group is not definite as an independent origin of this arm combination is possible. The species is quite polymorphic, 13 inversions having been recognized. The limits of these inversions, with preliminary data on their distributions, are given.
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    Zur Cytotaxionomie nordamerikanischer Chironomus -Arten.
    WUELKER, W ; SUBLETTE, J ; Martin, J (Finnish Zoological Publishing Board, 1968)