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Egg Deposition Behavior in the Haplodiploid Sawfly Athalia rosae ruficornis Jakovlev (Hymenoptera: Symphyta: Tenthredinidae) (1998)

Lee, J. M. ; Hashino, Y. ; Hatakeyama, M. ; [et al.]

Springer

Journal of insect behavior 11 (1998), S. 419-428

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ISSN: 1572-8889

Keywords: Hymenoptera ; Athalia rosae ; egg deposition behavior ; mating ; eye color mutation ; primary sex ratio

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract The egg deposition behavior of the turnip sawfly, Athalia rosae (Hymenoptera: Symphyta), is described. Both unmated and mated females lay eggs individually inside of fresh young leaves of cruciferous plants. During an oviposition event, females exhibit a distinct pause in abdominal contractions just before the actual egg deposition act. Unmated females show a longer pause (11.31 s on average) than mated females (4.38 s on overall average). By employing an eye color mutation, the sex of the eggs laid by females was ascertained. Females mated once lay mostly fertilized (diploid female) eggs initially but begin to lay a considerable number of unfertilized (haploid male) eggs later in life. The laying of an unfertilized egg is associated with a longer pause (6.98 s on average) than the laying of a fertilized egg (3.76 s on average). These results are in contrast to previous reports on apocritan Hymenoptera, where the presence of a pause or a longer pause during oviposition was associated with the deposition of fertilized eggs rather than unfertilized eggs. The possibility that mated Athalia rosae females control fertilization and its implications for sex allocation strategies are discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1020958831972

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Melatonin and puberty in female lambs exposed to EMF: A replicate study (1995)

Lee, J. M. ; Stormshak, F. ; Thompson, J. M. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Bioelectromagnetics 16 (1995), S. 119-123

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ISSN: 0197-8462

Keywords: EMF ; melatonin ; puberty ; sheep ; transmission line ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Physics

Notes: In an earlier study, we found no effects of 60 Hz electric and magnetic fields (EMF) from a 500 kV transmission line on serum melatonin patterns or on puberty in ten female Suffolk lambs (Ovis aries). We conducted a larger replicate study of 15 lambs exposed to a mean electric field of 6.3 kV/m and a mean magnetic field of 3.77 μT and 15 controls exposed to EMF two orders of magnitude weaker than in the line area. The replicate produced essentially the same results as our previous study. © 1995 Wiley-Liss, Inc.

Additional Material: 2 Ill.