TY - JOUR
T1 - Inbreeding effects on Propylea quatuordecimpunctata (Coleoptera: Coccinellidae)
AU - Morjan, Wilmar E.
AU - Obrycki, John J.
AU - Krafsur, Elliot S.
PY - 1999/3
Y1 - 1999/3
N2 - Up to 5 successive inbred generations were produced, through sibling mating, from 64 parental (P0) pairs of Propylea quatuordecimpunctata (L.) collected from 3 locations in the northeastern United States. The percentage of P0 females ovipositing >5 eggs was 62.5% compared with a mean of 43% for inbred generations F1 to F4. The percentage of intercross (F2 to F4) females producing >5 eggs was 61 ± 16% (mean ± SE), showing a restoration of fecundity. Egg hatch decreased from 84 ± 9% in the P0 to 4 ± 7% in the F4. Preimaginal developmental time among inbreds increased from 17 d in the F1 to >19 d in the F4. First instar to adult survivorship among inbreds decreased from 96.6 ± 0.9% in the F1 to 37.6 ± 3.7% in the F4. In contrast to the inbreds, mean survivorship in the intercross generations was 85 ± 11%, showing a restoration of viability. No effect of inbreeding on body size was detected. The high sensitivity to inbreeding in P. quatuordecimpunctata probably is caused by a high frequency of partially recessive deleterious alleles and overdominant loci.
AB - Up to 5 successive inbred generations were produced, through sibling mating, from 64 parental (P0) pairs of Propylea quatuordecimpunctata (L.) collected from 3 locations in the northeastern United States. The percentage of P0 females ovipositing >5 eggs was 62.5% compared with a mean of 43% for inbred generations F1 to F4. The percentage of intercross (F2 to F4) females producing >5 eggs was 61 ± 16% (mean ± SE), showing a restoration of fecundity. Egg hatch decreased from 84 ± 9% in the P0 to 4 ± 7% in the F4. Preimaginal developmental time among inbreds increased from 17 d in the F1 to >19 d in the F4. First instar to adult survivorship among inbreds decreased from 96.6 ± 0.9% in the F1 to 37.6 ± 3.7% in the F4. In contrast to the inbreds, mean survivorship in the intercross generations was 85 ± 11%, showing a restoration of viability. No effect of inbreeding on body size was detected. The high sensitivity to inbreeding in P. quatuordecimpunctata probably is caused by a high frequency of partially recessive deleterious alleles and overdominant loci.
KW - Biological control
KW - Body size
KW - Fitness traits
KW - Inbreeding depression
KW - Ladybeetles
KW - Propylea quatuordecimpunctata
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U2 - 10.1093/aesa/92.2.260
DO - 10.1093/aesa/92.2.260
M3 - Article
AN - SCOPUS:0032842407
SN - 0013-8746
VL - 92
SP - 260
EP - 268
JO - Annals of the Entomological Society of America
JF - Annals of the Entomological Society of America
IS - 2
ER -