Mating and Oviposition of Damselflies in the Laboratory

Johnson, Clifford

doi:10.4039/ent97321-3

Cited by 17 publications

(15 citation statements)

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“…Insectaries were covered with aluminium foil, which reflects sufficient light and impedes escape responses (Johnson, 1965), and several culture bottles of Drosophila were added to supply food. Insectaries were placed in a chamber maintained at 21-23°C, 60-80 per cent humidity and a photoperiod of 15L:9D hours.…”

Section: Methodsmentioning

confidence: 99%

The inheritance of female polymorphism in the damselfly Ischnura graellsii (Rambur) (Odonata: Coenagrionidae)

1990

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The damselfly Ischnura graellsii has three female coloration patterns: the male-like coloured or androchromatypic (A) females, and two gynochromatypic females: infuscans (olive-green to brown females, I), and aurantiaca (orange to brown females, 0). The inheritance of this polymorphism was studied by rearing the offspring of 33 laboratory crosses. Fourteen F1, eight F2 and eleven F3 crosses produced more than 2400 adults in laboratory conditions. Results of these crosses indicate: (1) the progeny of one female can consist of one, two or all phenotypes; (2) when two phenotypes occur the ratio is 1: 1 or 3: 1; and (3) when all phenotypes occur the ratio is 2: 1: 1 for A :1:0 females. The simplest hypothesis to explain these results is that three alleles of one autosomal locus control this polymorphism. The androchromatypic allele (pa) is dominant over both gynochromatypic alleles, and infuscans (p) over aurantiaca (p°) (Dominance: pa> p'> p°). Males possess all six possible genotypes but only one phenotype (pa)• All matings were compatible with the hypothesis, and the presence of all genotypes was proved with the matings obtained. Hypotheses about the maintenance of female polymorphism in Ischnura damselflies so far studied are revised.

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Section: Methodsmentioning

confidence: 99%

The inheritance of female polymorphism in the damselfly Ischnura graellsii (Rambur) (Odonata: Coenagrionidae)

1990

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“…Main aining a labora ory s ock of live Odona a for physiological s udies Previous me hods Me hods for keeping Odona a alive in labora ory condi ions were described by Johnson (1965Johnson ( , 1966a and by Seidel & Buchhol z (1962) . Johnson (1965) Flanders, Belgium), a bio ope described by Dumon (1968Dumon ( , 1971, and ranspor ed o he labora ory in a ches wi h fine mesh screening .…”

Section: Ma Erials and Me Hodsmentioning

confidence: 99%

“…Johnson (1965) Flanders, Belgium), a bio ope described by Dumon (1968Dumon ( , 1971, and ranspor ed o he labora ory in a ches wi h fine mesh screening . Two-day old enerals, comple ely coloured, bu s ill wi h opaque wings, were also included .…”

Section: Ma Erials and Me Hodsmentioning

confidence: 99%

Population dynamics of Ischnura E. elegans (Vander Linden) (Insecta: Odonata) with special reference to morphological colour changes, female polymorphism, multiannual cycles and their influence on behaviour

Hinnekint

1987

Hydrobiologia

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Meres raa 32, B-9430 Aals (Nieuwerkerken), Belgium Abs rac Labora ory and field experimen s on adul I. elegans provide correc ion echniques for he es ima ion of popula ion parame ers based only on cap ure-recap ure da a . Thus i is demons ra ed ha male and female longevi ies are iden ical and ha heir sex ra io is 0 .5 (= Male frac ion) . Longevi y, measured a he wa er, erroneously appears o differ be ween sexes, and sex ra io is also biased .This bias is a func ion of popula ion densi y, which causes a differen dis ribu ion of males and females, ma ures and imma ures, andro-and he eromorphic females, and is regula ed by aggressive, erri orial and ma ing behaviour of individuals . The female ma ura ion period exceeds ha of he male . Female polymorphism is an adap a ion o popula ion densi y, high densi y favouring andromorphs . This polymorphism is de ermined by single allelic au osomal inheri ance wi h a sex-linked expression .In crowded popula ions, visual in erac ions be ween individuals cause heir juvenile hormone i er o rise .This shor ens ma ura ion ime, he period of morphological colour changes, and life span . This mechanism coun erac s crowding, and synchronises ma ura ion and developmen of sexual behaviour .In he course of heir life, individuals undergo a number of colour changes . The developmen of he colours af er eclosion coincides wi h sperma o-and oogenesis . The morphological colour change a sexual ma uri y is due o neu ralisa ion of was e produc s of he pro ein me abolism . The colour changes a old age are par ly due o dehydra ion . 3 In roduc ion The zygop eran Ischnura elegans (Vander Linden), widely dis ribu ed in Europe, has a long fligh season, ex ending be ween mid-May and midSep ember . I has been in ensively s udied by differen au hors in he field and in he labora ory. I. elegans shows a morphological colour change during i s life span, fur her complica ed by he fac ha females display differen colour morphs . The colour changes in I. elegans are called morphological if hey coincide wi h developmen al s ages and are irreversible. Reversible colour changes induced by empera ure or humidi y are called physiological . Morphological colour changes are observed in many Odona e species, e.g . in Argia moes a (Johnson, 1973), Croco hemis ery hraea, C sanguinolena, C. divisa, Trapezos igma b. basilare, Pan ala sp. (Gambles, 1960), and Pla hemis lydia (Jacobs, 1955) . Polymorphism is very common in Ischnura spp. and has been described by Tillyard (1905) in I .he eros ic a, by Grieve (1937) in I. ver icalis, by Killing on (1924) and Longfield (1936, 1949) in I. elegans, by Johnson (1966b) in I. demorsa, and by Johnson (1964a) in I. damula. In wha follows, I define as enerals all specimens wi h a ypical vi reous sheen on he wings (firs and second day af er emergence) . Imma ures are all animals no ye showing sexual behaviour. The imma ure s age is fur her divided in o a eneral and a juvenile s age . Ma ures are all animals ha have begun o show

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“…Procedures for laboratory mating and culture are given in detail by Johnson (1965). A total of 23 crosses were obtained in the interval between 1962 and 1965.…”

Section: Methodsmentioning

confidence: 99%