ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Effects of experience on palatability hierarchies of novel plants in the polyphagous grasshopperSchistocerca americana (1991)
    Springer
    Oecologia 87 (1991), S. 424-428 
    Details
    ISSN: 1432-1939
    Keywords: Diet breadth ; Experiential effects ; Grasshoppers ; Induced preferences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We studied the influence of diet composition and breadth on the subsequent acceptability of three novel plants to sixth instarSchistocerca americana. Rearing diets of equal breadth differing in composition, and diets differing in breadth, significantly altered first meal length on some but not all of the test plants. These effects on palatability altered and at times reversed the palatability hierarchy of insects reared on different diets. The effects of rearing insects on broad diets were not produced by exposure to the plant odors alone, but apparently required contact with a diversity of plants while feeding. Switching diets for 24 h prior to testing did not alter preferences induced by rearing diets. The relationship of these patterns to induced preferences in other insects, and some possible mechanisms for generating induced preferences, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00634601
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Infidelity of leafcutting ants to host plants: resource heterogeneity or defense induction? (1990)
    Springer
    Oecologia 82 (1990), S. 394-401 
    Details
    ISSN: 1432-1939
    Keywords: Herbivory ; Induced defenses ; Leaf chemistry ; Atta colombica ; Tropical deciduous forest
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Leafcutting ants have strong among- and within-plant preferences, and generally abandon plants long before they are completely defoliated. Two tropical deciduous forest tree species preferred by the leafcutting ant Atta colombica were studied to determine how variation in resource quality affects ant selectivity and partial defoliation of plants. Significant differences in palatability and leaf characteristics of Spondias mombin and Bursera simaruba were found among trees and among leaf types within trees, but not among branches within trees. No short-term responses to experimental defoliation of up to 50% of total canopy were found in either species. Leaf nutrient and poisture content were positively correlated, and phenolic content negatively correlated, with the palatability of Spondias mombin, a species containing hydrolyzable tannins. Leaf moisture and phenolic content were both positively correlated with the palatability of Bursera simaruba, which contains predominantly condensed tannins. The results suggest that variation in leaf quality among and within plants is at least a partial explanation for ant selectivity and partial defoliation of preferred species. There is no evidence that rapidly induced changes in plant chemistry affect ant decisions to abandon these plants. Instead, it appears likely that ants abandon plants once high-quality leaf patches are exhausted. Quantitative variation in leaf nutrients, moisture, and secondary chemicals all appear to contribute to ant preferences for individuals and tissues of highly palatable plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317488
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Population and individual polyphagy in the grasshopperTaeniopoda eques during natural foraging (1994)
    Springer
    Entomologia experimentalis et applicata 71 (1994), S. 167-176 
    Details
    ISSN: 1570-7458
    Keywords: diet diversity ; polyphagy ; Romaleidae ; Sonoran Desert ; Taeniopoda eques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dietary patterns of free-foraging individuals of the polyphagous grasshopperTaeniopoda eques Burmeister (Romaleidae) were studied at three desert grassland sites in southern Arizona. At the population level this species was highly polyphagous at all sites, but showed evidence of selectivity in terms of frequency of feeding relative to frequency of contacts with resources. Most feeding bouts were very short, suggesting that most plants were relatively unpalatable. Both diet diversity and the mean length of feeding bouts varied among the study sites, primarily because highly preferred resources and plant tissues were not encountered with equal frequency at all sites. Individual insects were highly polyphagous. Dietary overlap calculations showed that insects at a given site generally consumed diets less similar than the resources they contacted. This result does not support the idea that all insects preferred the same subset of resources. Most differences in diet among individuals were probably due to environmental heterogeneity, but factors such as sequence of encounter, compensatory feeding on complementary resources, and intrinsic differences in preference may also have contributed to variation in diets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382384
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Temporal pattern of resource use and variation in diets of individual grasshoppers (Orthoptera: Acrididae) (1993)
    Springer
    Journal of insect behavior 6 (1993), S. 441-453 
    Details
    ISSN: 1572-8889
    Keywords: food preference ; individual diets ; polyphagy ; resource fidelity ; switching ; Taeniopoda eques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Patterns of resource fidelity, switching, and variation in individual diet were examined in the polyphagous grasshopper Taeniopoda equesforaging in experimental cages over an 11-day period. Ten novel dicots were provided in the cages, but grasshoppers fed primarily on kale (Brassica oleraceavar. acephala),lobelia (Lobelia erinus),pansy (Viola x wittrockiana),and dry bermuda grass (Cynodon dactylon).Grasshoppers showed significant fidelity to a single plant within a meal but tended to eat less of the same plant in the next meal and, in the case of pansy, on the next day. Grasshoppers switched nonrandomly, suggesting that compensatory feeding on complementary resources may have occurred. There was no evidence that behavioral interactions among individuals increased switching rate or lowered fidelity. Overall patterns of resource use varied significantly among grasshoppers during the study, despite frequent switching among resources and a significant tendency to aggregate while feeding. All individuals were polyphagous but differed in relative consumption of available plants. The results suggest that individual grasshoppers express different feeding patterns that are consistent over time and that variation in diet among individual observed in the field may be more than simple sampling error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049524
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Variation in dietary patterns among and within polyphagous grasshopper species (Orthoptera: Acrididae) (1995)
    Springer
    Journal of insect behavior 8 (1995), S. 563-577 
    Details
    ISSN: 1572-8889
    Keywords: Acrididae ; diet breadth ; host preference ; intraspecific variation ; polyphagy ; preference hierarchy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Individuals of two polyphagous grasshopper species,Melanoplus differentialis andSchistocerca albolineata, were reared under standardized conditions to eliminate prior experience as an influence on feeding behavior. Individuals were offered four plants in simultaneous choice tests from 8 to 14 times during development to adulthood. Individual insects varied in the preferred plant and the strength of preference, in the strength of the preference hierarchy among the four plants, and in breadth of feeding in choice tests. Average feeding diversity in choice tests increased significantly in later instars, but the sexes did not differ in feeding pattern. In both species a significant preference for one plant was generally but not invariably associated with a consistent preference hierarchy. Breadth of feeding in all tests was inversely related to the strength of preference and of the preference hierarchy. Although the two species differed in feeding diversity and in the relationship between preference and strength of preference hierarchy, evidence suggests that these differences were due to the specific plants used rather than to true interspecific differences. The existence of such variation under highly standardized rearing conditions suggests that genetic variation for these characteristics may exist in natural populations of polyphagous grasshoppers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01997231
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Toxicity of terpenoid deterrents to the leafcutting antAtta cephalotes and its mutualistic fungus (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 59-69 
    Details
    ISSN: 1573-1561
    Keywords: Atta cephalotes ; Hymenoptera ; Formicidae ; Attini ; leafcutter ants ; mutualism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Four natural products, of varying activity as deterrents of leafcutter attack, were tested for their effects on ant survival and on the growth of the mutualistic attine fungus. The substances were incorporated into an artificial liquid diet for bioassays on the ants or included in an agar culture medium for fungus growth-inhibition studies. Three of the four compounds exhibited deleterious effects on either adult leafcutting ants or their mutualistic fungus, and there appeared to be some correlation between deterrency and activity in these toxicity assays. The implications of these findings for leafcutting ant foraging patterns are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01022531
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Effects of Plant Diet on Detoxification Enzyme Activities of Two Grasshoppers, Melanoplus differentialis and Taeniopoda eques (1998)
    Springer
    Journal of chemical ecology 24 (1998), S. 2151-2165 
    Details
    ISSN: 1573-1561
    Keywords: Cytochrome P450 ; glutathione ; S-transferase ; esterase ; plant diet ; Melanoplus differentialis ; Taeniopoda eques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The polyphagous grasshoppers Melanoplus differentialis and Taeniopoda eques use different foraging patterns: over time M. differentialis tends to reduce the variety of host plants it feeds on and specialize on particular plants (diet components), whereas T. eques mixes host plants to achieve a very diverse diet. We tested the hypothesis that these differing behaviors are correlated with differing patterns of detoxification enzymes. The activities of midgut, fat body, and malpighian tubule detoxification enzymes were determined in last instars of the two grasshoppers, reared for five days on single-or mixed-plant diets. Significant differences in several cytochrome P450 activities and glutathione S-transferase were evident for nymphal grasshoppers feeding on different plant diets. However, the behavioral differences between the two species could not be explained by an underlying flexibility of detoxification response in M. differentialis, but lacking in T. eques. This is the first reported evidence that detoxification enzyme activities are affected by plant diet in polyphagous orthopterans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020797912523
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Comparative deterrency of two terpenoids to two genera of attine ants (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 2279-2288 
    Details
    ISSN: 1573-1561
    Keywords: Atta cephalotes ; Acromyrmex octospinosus ; leafcutting ants ; Hymenoptera ; Formicidae ; terpenoids ; deterrents ; dosage-response studies ; bioassays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Caryophyllene and caryophyllene epoxide are two terpenoids found in neotropical plants and known to be deterrent to leafcutter ants. To estimate the variation in deterrent activity of these compounds toward the generaAtta andAcromyrmex, behavioral bioassays were conducted over a range of concentrations. The responses of four captive colonies ofAtta cephalotes and two captive colonies ofAcromyrmex octospinosus, all from a single locality in Costa Rica, were studied. Although specific patterns of deterrency differed in the two genera, in both cases caryophyllene epoxide concentrations of 0.70 mg/g or greater, and caryophyllene concentrations of 7.0 mg/g or greater, significantly deterred the harvest of potential substrates. Individual colonies within each genus did not differ significantly in their responses to caryophyllene epoxide. The mean response of the two genera to caryophyllene epoxide differed significantly, but responses to caryophyllene did not.Acromyrmex octospinosus was more sensitive to low concentrations and less sensitive to high concentrations of caryophyllene epoxide than wasAtta cephalotes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012081
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    facet.materialart.
    Unknown
    Does plant allometry predict biased sex allocation in Triadica sebifera (L.) small (Euphorbiaceae)? (2019)
    Springer
    Details
    Publication Date: 2019-04-01
    Print ISSN: 1385-0237
    Electronic ISSN: 1573-5052
    Topics: Biology
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Effects of experience on palatability hierarchies of novel plants in the polyphagous grasshopperSchistocerca americana (1991)
    Springer
    Details
    Publication Date: 1991-01-01
    Print ISSN: 0029-8549
    Electronic ISSN: 1432-1939
    Topics: Biology
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...