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  • 1
    Electronic Resource
    Electronic Resource
    Dietary mixing in grasshoppers: switching induced by nutritional imbalances in foods (1991)
    Springer
    Entomologia experimentalis et applicata 61 (1991), S. 247-253 
    Details
    ISSN: 1570-7458
    Keywords: Schistocerca ; dietary mixing ; compensatory feeding ; learning ; flavors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dietary mixing by nymphs of Schistocerca americana was studied in the laboratory using artificial diet cakes. Individuals were given either two different inadequate but complementary diet cakes or two adequate and identical ones. When unique flavors (coumarin or NHT) were added to the diet cakes, insects given the inadequate diet treatment switched between cakes more than insects exposed to the adequate diets. This was not the case when no identifying flavors were added.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00187728
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  • 2
    Electronic Resource
    Electronic Resource
    Foraging by a Generalist Grasshopper: The Distance Between Food Resources Influences Diet Mixing and Growth Rate (Orthoptera: Acrididae) (1997)
    Springer
    Journal of insect behavior 10 (1997), S. 829-840 
    Details
    ISSN: 1572-8889
    Keywords: foraging ; grasshopper ; predation risk ; dietary mixing ; Schistocerca ; patch size
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The grasshopper, Schistocerca americana, grew better on a mixture of cotton and kale than on either alone. When the two foods were placed in close proximity, growth rates were similar among individuals, but when they were 20 cm apart growth rates were extremely variable among individuals. Behavioral analyses showed that distance influenced the dietary mixing behavior of individuals. Foods close together were sampled more often and there were more meals that included both food types. When foods were distant, individuals tended to stay for relatively long periods at one or the other; when on cotton, this resulted in more feeding on cotton, which was an inferior food. Individuals varied in the extent to which they were constrained by the distance between the two foods. Those that moved between the foods less and therefore mixed less seemed to grow less well, suggesting the possibility of a trade-off between active foraging and behavior associated with predator avoidance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOIR.0000010416.54387.44
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  • 3
    Electronic Resource
    Electronic Resource
    Dietary mixing in grasshoppers: Changes in acceptability of different plant secondary compounds associated with low levels of dietary protein (Orthoptera: Acrididae) (1991)
    Springer
    Journal of insect behavior 4 (1991), S. 545-556 
    Details
    ISSN: 1572-8889
    Keywords: Schistocerca ; grasshopper ; learning ; aversion ; novelty ; polyphagy ; dietary mixing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Schistocerca americanasixth-instar nymphs were examined for a change in diet acceptance, in which insects experiencing an unfavorable diet subsequently become predisposed to eat relatively less of that diet and more of diets with a novel flavor than they would had they previously fed on a more adequate diet. Insects were pretreated for 4 h on either low-protein (2 % wet wt) or higherprotein (4%) artificial diets flavored with a plant secondary compound (tomatine or rutin). They were then offered, in choice or no-choice tests, the lowprotein diet with the familiar or a novel (tomatine, rutin, or NHT) flavor. When tomatine was the familiar and rutin the novel flavor in a no-choice test, the insects previously fed low-protein diets took relatively long meals on the novel and relatively short meals on the familiar diets compared with the insects that had previously eaten higher-protein diets. A similar, but in this case considerably less pronounced and statistically nonsignificant, pattern existed in the reciprocal design experiment in which rutin was the familiar and tomatine the novel flavor. Similarly, insects fed low-protein diets flavored with rutin subsequently showed an increased relative preference for the novel flavor (NHT) in a choice test, compared with the high protein-pretreated insects. It is concluded that insects fed protein-deficient diets may subsequently show a preference for novel foods through different mechanisms, the importance of which may differ in different circumstances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048069
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  • 4
    Electronic Resource
    Electronic Resource
    Comparisons of deterrency and toxicity of selected secondary plant compounds to an oligophagous and a polyphagous acridid (1988)
    Springer
    Entomologia experimentalis et applicata 46 (1988), S. 241-247 
    Details
    ISSN: 1570-7458
    Keywords: Schistocerca ; Locusta ; deterrence ; toxicity ; plant secondary compounds ; grasshopper feeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La comparaison a porté sur les relations entre répulsion et toxicité de huit substances secondaires chez deux acridiens: Locusta migratoria, spécialiste de graminées, et Schistocerca gregaria, polyphage. L. migratoria est repoussé par toutes les substances proposées, aux concentrations naturelles, pour lesquelles S. gregaria a présenté des comportements trés divers. Mais surtout, L. migratoria a été significativement plus sensible que S. gregaria aux effets toxiques de ces substances quand elles sont injectées dans son haemolymphe; S. gregaria a réagi à ces substances plus par des modifications de son comportement. Il y a une corrélation significative pour les deux espèces, entre la répulsion et la toxicité des substances injectées.
    Notes: Abstract A comparison was made of the relationship between deterrence and toxicity of eight secondary compounds to two acridids. The grass specialist Locusta migratoria was compared with the polyphagous Schistocerca gregaria. L. migratoria was deterred by all compounds presented at natural concentrations to which S. gregaria showed a variety of behavioral responses. Overall, L. migratoria was significantly more susceptible to toxic effects of the chemicals when injected into the hemolymph than was S. gregaria and was more sensitive behaviourally to them. There was a significant correlation in both species between deterrency and toxicity of injected compounds, but little evidence of a relationship between deterrency and oral toxicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00364195
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  • 5
    Electronic Resource
    Electronic Resource
    Failure of tannic acid to inhibit digestion or reduce digestibility of plant protein in gut fluids of insect herbivores (1987)
    Springer
    Journal of chemical ecology 13 (1987), S. 605-621 
    Details
    ISSN: 1573-1561
    Keywords: Tannins ; digestibility-reducing substances ; surfactants ; detergency ; herbivory ; chemical defense ; allelochemics ; Manduca sexta ; Lepidoptera ; Sphingidae ; Schistocerca gregaria ; Orthoptera ; Acrididae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The rate of hydrolysis of the abundant foliar protein, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPC), in enzymatically active gut fluid ofManduca sexta larvae is very rapid and is unaffected by the presence of tannic acid, even when tannic acid is present in the incubation mixture in amounts in excess of the amount of RuBPC. When this protein is dissolved in the denatured gut fluids ofM. sexta larvae orSchistocerca gregaria nymphs, large amounts of tannic acid must be added to bring about the precipitation of significant quantities of protein. The ability of insect gut fluid to prevent the formation of insoluble tannin-protein complexes is due to the presence of surfactants. On the basis of our results and a review of the findings of other investigators, we argue that there is no evidence that tannins reduce the nutritional value of an insect's food by inhibiting digestive enzymes or by reducing the digestibility of ingested proteins and, further, that the failure of tannins to interfere with digestion is readily explained on the basis of well-documented characteristics of the digestive systems of herbivorous insects. In challenging the currently popular notion that tannins are digestibility-reducing substances, we do not challenge the general utility of either the apparency theory or resource availability theory of plant defense. In debating the merits of these two analyses of plant-herbivore interactions, however, the demise of tannins as all-purpose, dose-dependent, digestibility-reducing defensive substances must be taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01880103
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  • 6
    Electronic Resource
    Electronic Resource
    Tolerance of acridids to ingested condensed tannin (1981)
    Springer
    Journal of chemical ecology 7 (1981), S. 247-256 
    Details
    ISSN: 1573-1561
    Keywords: Condensed tannin ; quebracho ; Orthoptera ; Acrididae ; digestibility ; Schistocerca ; Locusta ; Zonocerus ; Chortoicetes ; peritrophic membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Four species of Acridoidea were fed on wheat leaves with and without the condensed tannin, quebracho. In no case was it deleterious to survival and growth at levels below about 10% dry weight on the food. Similarly, consumption, digestibility, and utilization of food were unaffected at up to 10% dry weight. At higher concentrations, however, the consumption and the efficiency of conversion of digestion were reduced, although digestibility was little affected. The possible mechanisms for such tolerance are discussed, and contrast made with insects which are very sensitive to ingested condensed tannin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00995747
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  • 7
    Electronic Resource
    Electronic Resource
    Chemical aspects of host-plant specificity in threeLarrea-feeding grasshoppers (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 561-579 
    Details
    ISSN: 1573-1561
    Keywords: Creosote bush ; Larrea ; nordihydroguaiaretic acid ; grasshoppers ; monophagy ; Bootettix ; Ligurotettix ; Cibolacris ; Orthoptera ; Acrididae ; host selection ; feeding deterrence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The host-selection behavior of three species of grasshopper feeding on creosote bush,Larrea tridentata, in southern California was investigated. The species wereBootettix argentatus, which is monophagous;Ligurotettix coquilletti, oligophagous; andCibolacris parviceps, polyphagous. The monophagous species is stimulated to bite by nordihydroguaiaretic acid (NDGA), a compound that is characteristic of the host plant and that may comprise up to 10% of the dry weight of the leaf. Host specificity ofB. argentatus is enhanced by deterrent responses to compounds present in the surface waxes of all non-host-plant species. Both the oligophagous and polyphagous species are deterred by NDGA at naturally occurring concentrations. Their association withLarrea is probably based on tolerance of the plant chemicals rather than on dependence on specific chemicals. Factors other than the chemistry of the plant probably also contribute to the specificity ofB. argentatus andL. coquilletti.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01013907
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  • 8
    Electronic Resource
    Electronic Resource
    Relationship between deterrence and toxicity of plant secondary compounds for the grasshopperSchistocerca americana (1991)
    Springer
    Journal of chemical ecology 17 (1991), S. 2519-2526 
    Details
    ISSN: 1573-1561
    Keywords: Schistocerca americana ; Orthoptera ; Acrididae ; deterrence ; toxicity ; plant defense ; diet breadth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A variety of plant secondary compounds, several of which are quite widespread in nature were tested for their deterrence to the generalist grasshopperSchistocerca americana in short-term behavioral assays. The compounds were coumarin, salicin, tannic acid, gramine, nicotine, quinine, carvone, geraniol, abietic acid, umbelliferone, and ursolic acid. These were then tested for their post-ingestional effects over the whole of the last larval instar. Different methods were employed to mask the taste of compounds that were deterrent in order to ensure that any effects were not due to reduced feeding. In no case was there any indication of a detrimental effect or any trend suggesting one. In two cases, there was a significant increase in growth rate with the addition of the secondary compound to the diet. The evolutionary implications of these findings are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994599
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