Brazilian Aphidoidea: II. Accounts of the Lachninae, Chaitophorinae, Greenideinae, Anoeciinae, and Hormaphidinae.

Keys are provided for the identification of the tribes, genera and species of Brazilian Lachninae, Chaitophorinae, Greenideinae, Anoeciinae and Hormaphidinae. Host plant and distribution data are given for each species.Made available in DSpace on 2011-04-09T12:11:51Z (GMT). No. of bitstreams: 1 pab9301mar.pdf: 918821 bytes, checksum: 4c8a0f5c1fbb002424ed001f9ce8d5e0 (MD5) Previous issue date: 2001-08-13199

Intraspecific variability in herbivore performance and host quality: a field study of Uroleucon caligatum (Homoptera: Aphididae) and its Solidago hosts (Asteraceae)

1. Performances of two clones of Uroleucon caligatum on eleven clones of Solidago were measured by caging aphids on plants in the field. 2. Several measures were obtained, including developmental time from birth to adulthood, size of first instar nymphs, adult weight, and total colony weight. 3. All measures of performance were strongly affected by plant clone. 4. Effect of aphid clone-plant clone interaction was significant only for first instar size. 5. In a subsequent screenhouse experiment, plant clones were subjected to uniform conditions and still exhibited large differences in host quality.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/72064/1/j.1365-2311.1981.tb00617.x.pd

Genetic variation for an aphid wing polyphenism is genetically linked to a naturally occurring wing polymorphism

Many polyphenisms are examples of adaptive phenotypic plasticity where a single genotype produces distinct phenotypes in response to environmental cues. Such alternative phenotypes occur as winged and wingless parthenogenetic females in the pea aphid (Acyrthosiphon pisum). However, the proportion of winged females produced in response to a given environmental cue varies between clonal genotypes. Winged and wingless phenotypes also occur in males of the sexual generation. In contrast to parthenogenetic females, wing production in males is environmentally insensitive and controlled by the sex-linked, biallelic locus, aphicarus (api). Hence, environmental or genetic cues induce development of winged and wingless phenotypes at different stages of the pea aphid life cycle. We have tested whether allelic variation at the api locus explains genetic variation in the propensity to produce winged females. We assayed clones from an F(2) cross that were heterozygous or homozygous for alternative api alleles for their propensity to produce winged offspring. We found that clones with different api genotypes differed in their propensity to produce winged offspring. The results indicate genetic linkage of factors controlling the female wing polyphenism and male wing polymorphism. This finding is consistent with the hypothesis that genotype by environment interaction at the api locus explains genetic variation in the environmentally cued wing polyphenism