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  • 1
    Digitale Medien
    Digitale Medien
    Evidence for sex-related differences in phototactic bahaviour ofStreptocephalus proboscideus (Crustacea: Anostraca) (1995)
    Springer
    Hydrobiologia 298 (1995), S. 87-91 
    Details
    ISSN: 1573-5117
    Schlagwort(e): phototaxis ; vertical migration ; temporary pools ; Anostraca ; Streptocephalus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The phototactic behaviour of adults of the Sudanese fairy shrimpStreptocephalus probiscideus was studied under laboratory conditions. Males were less negatively phototactic than females. This was also evident when colour filters were used. females only became little less negatively phototactic under yellow light, whereas males showed a strong positively phototactic response. The response to the positioning of a yellow filter was stronger than to the use of a red or blue filter for both sexes. The laboratory findings were compared with casual field observations onStreptocaphalus torvicornis that indicate differential vertical distribution between the sexes and a nocturnal vertical migration. Migratory behaviour with ascent starting at dusk is also predicted forS. proboscideus. This behaviour may reduce common stress factors in desert pools such as photodamage, visual predation pressure, and high surface temperatures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00033803
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The genetics of phototaxis in Daphnia magna: Existence of three phenotypes for vertical migration among parthenogenetic females (1988)
    Springer
    Hydrobiologia 162 (1988), S. 47-55 
    Details
    ISSN: 1573-5117
    Schlagwort(e): phototaxis ; genotype ; vertical migration ; Daphnia magna
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Using a cloning technique, we revealed the existence of three phototactically distinct types in Daphnia magna, viz. negatives, positives, and “gipsies”. The latter migrate continuously between a low and a high light intensity. The expression of this behaviour is genetically determined, although positives and negatives can reversibly switch into “gipsies”. It is proposed that two opposite genotypes exist, with the “gipsy” behaviour epigenetically induced. All juveniles behave more or less uniformly, irrespective of their origin. The phototactic responses develop rather late during ontogenesis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00014332
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    An analysis of the phototactic behaviour of Daphnia magna clones and their sexual descendants (1991)
    Springer
    Hydrobiologia 225 (1991), S. 217-227 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Cladocera ; Daphnia magna ; crosses ; genetics ; phototaxis ; vertical migration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Daphnia magna clones, isolated from different natural populations, were inbred and crossbred. Some aspects of the heredity of the phototactic behaviour, quantified by an index, were analysed. Heritability in the broad sense was determined for several assemblages of clones through calculation of the clonal repeatability. Heritability sensu strictu was determined by offspring-parent regressions. Frequency distributions of a phototactic index of several inbred and crossbred families are given. The results indicate a significant contribution of additive genetic variance to the total phenotypic variance. Comparison of heritability estimates suggests an important genetic interaction component. Some implications of these results on the variability of vertical migration patterns in natural populations are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028400
    Standort Signatur Einschränkungen Verfügbarkeit
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