A novel level of interactions in plant–insect systems

Ng, David

doi:10.1038/334611a0

Cited by 91 publications

(60 citation statements)

References 15 publications

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“…Instead of negative genetic correlations, studies commonly report either no correlation, a positive correlation, or mixed results (e.g. Rausher, 1984;Via, 1984;Hare & Kennedy, 1986;James et al, 1988;Karowe, 1990;Ng, 1988;Fox, 1993). Hence, genetic trade-offs in performance may not always occur when an insect population initially expands its host range to include another plant species, or they may not be observed when using the kinds of experiments commonly conducted to test for the presence of trade-offs.…”

Section: Introductionmentioning

confidence: 99%

Trade‐offs in larval performance on normal and novel hosts

Thompson

1996

Entomologia Exp Applicata

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The evolution of host specialization in phytophagous insects is generally thought to involve genetic trade-offs that prevent individuals from maximizing fitness simultaneously on two or more hosts. Several hypotheses, however, have suggested that trade-offs may not be evident in experiments comparing larval performance on normal and novel hosts. Tests on survivorship, growth rate, and pupal mass among families of the swallowtail butterfly Papilio oregonius on its normal host and on a novel host provide support for these hypotheses, although they do not discriminate among them. Families differed in their relative performance on the hosts, but there was no evidence of a negative genetic correlation between hosts for any of the measures of performance. In addition, there were no correlations among the different measures, corroborating an earlier result suggesting that these different components of performance in the P machaon species group are under at least partially separate genetic control. These results and similar results published for other insects have now produced a body of studies indicating that genetic trade-offs in individual components of larval performance may not be a major factor preventing shifts onto novel host plants. Trade-offs leading to the evolution of host specialization are more likely to involve coordination among the various components of performance together with ecological factors that allow higher fitness on one host than on others.

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Section: Introductionmentioning

confidence: 99%

Trade‐offs in larval performance on normal and novel hosts

Thompson

1996

Entomologia Exp Applicata

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“…Several studies have demonstrated the existence of interor intrapopulational variability of host recognition and selection, as well as an inter-or intrapopulational variability of correlation between oviposition preference and larval performance (Ng 1988, Courtney et al 1989, Sadeghi & Gilbert 1999. This behavioral variability may be due to genetic variation among individuals in terms of the possibility of finding or choosing different hosts (Wasserman & Futuyma 1981, Jaenike 1990, or it may also be the result of experiencing different environments as adults and/or as immatures.…”

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confidence: 99%

Oviposition Behavior of Ceratitis capitata Wiedemann (Diptera: Tephritidae): Association Between Oviposition Preference and Larval Performance in Individual Females

Joachim‐Bravo¹,

Fernandes²,

Bortoli³

et al. 2001

Neotrop. Entomol.

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-The oviposition preference and larval performance of females of Ceratitis capitata (Wiedemann) were examined. Wild or laboratory-reared females were tested for oviposition preference in relation to papaya fruit in different stages of ripeness, as well as to two different fruits: papaya and apple. The results demonstrated that both laboratory-reared and wild females preferred ripe papaya fruit compared to unripe fruit for oviposition, and that ripe papaya was the best for larval performance. When oviposition preference was tested with different fruits (papaya and apple), both wild and laboratoryreared larvae developed better in papaya. However, only wild females showed a preference for oviposition on papaya as opposed to apple. Laboratory-reared females showed no oviposition preference on fruits that resulted in better larval performance.

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“…Some studies show that female moths prefer to oviposit on host plants augmented with nitrogen (Wolfson 1980;Myers 1985). Singer et al (1988) and Ng (1988) showed that oviposition preference and larval performance may be correlated such that females prefer the plant species on which their larvae have the greatest chance of surviving during their fi rst 10 days of growth. Th is was corroborated in the present experiment by a positive relationship between plant N and B. fusca as well as E. saccharina larval densities.…”

Section: Discussionmentioning

confidence: 99%

The effect of grassy field margins and fertilizer on soil water, plant nutrient levels, stem borer attacks and yield of maize in the humid forest zone of Cameroon

Ndemah

Schulthess

Nolte

2006

Annales de la Société entomologique de France (N.S.)

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Abstract. Two fi eld experiments, planted in a split plot design, were conducted during 2002 in the forest zone of Cameroon, to investigate the effect of border rows with Pennisetum purpureum (Poaceae) or with Panicum maximum (Poaceae) on soil water, plant nitrogen (N), phosphorus (P) and potassium (K), borer infestations, parasitism and maize yield. The grassy boundaries were the main plots and fertilizer treatment the sub plots. Soil humidity was signifi cantly higher under the grass borders than in maize plots. Nitrogen uptake by maize tended to be highest in plots surrounded by P. purpureum but the differences were signifi cant during the second season only. Busseola fusca (Fuller) (Lepidoptera: Noctuidae) was the predominant borer species followed by Eldana saccharina (Walker) (Lepidoptera: Pyralidae). The predominant parasitoid species was the scelionid egg parasitoid Telenomus busseolae Gahan (Hymenoptera: Scelionidae). During both seasons, plant nitrogen, B. fusca infestation, plant damage and yield were signifi cantly higher in maize sub-plots that received fertilizer The interaction between the grassy margin effect and the fertilization was signifi cant only for B. fusca infestations, during the second season with maize + P. purpureum having a signifi cantly lower number of borers in the fertilized than the unfertilized sub-plots. The grassy borders had no effect on B. fusca egg parasitism variables except in the fi rst season, when maize with P. purpureum had a signifi cantly higher percentage of egg batches parasitized. During both seasons, there were some signifi cant differences in yield variables between main plots but the trends were not clear. Multiple regression showed that B. fusca infestation, plant damage, egg parasitism, plant N, P and K affected yield, with plant nutrients explaining most of the variability. The implication of the fi ndings for the feasibilty of this habitat management technology to farmers in southern Cameroon is discussed.Résumé. L'effet de bordure herbeuse et de la fertilisation sur la teneur en eau des sols, les nutriments de la plante, l'infestation par les foreurs et le rendement du maïs dans la zone de forêt humide du Cameroun. Deux essais au champ, dans des parcelles subdivisées ont été menés en 2002 dans la zone de forêt du Cameroun, pour étudier l'effet de bordure de Pennisetum purpureum (Poaceae) ou Panicum maximum (Poaceae), sur l'humidité du sol, les teneurs en azote, phosphore et potassium de la plante, l'infestation par les foreurs des tiges, leur parasitisme et le rendement du maïs. Les bordures herbeuses étaient les parcelles principalement à l'étude avec l'utilisation d'engrais pour les sous-parcelles de contrôle. L'humidité du sol était signifi cativement plus élevée en bordure qu'à l'intérieur des parcelles de maïs. La prise en azote par le maïs avait tendance à être plus élevée dans les parcelles entourées par P. purpureum mais ceci ne fût observé que dans la deuxième campagne d'évaluation. Busseola fusca (Fuller) (Lepidoptera : Noctuidae) a été le for...

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A novel level of interactions in plant–insect systems

Cited by 91 publications

References 15 publications

Trade‐offs in larval performance on normal and novel hosts

Trade‐offs in larval performance on normal and novel hosts

Oviposition Behavior of Ceratitis capitata Wiedemann (Diptera: Tephritidae): Association Between Oviposition Preference and Larval Performance in Individual Females

The effect of grassy field margins and fertilizer on soil water, plant nutrient levels, stem borer attacks and yield of maize in the humid forest zone of Cameroon

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