Library

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
    Springer
    Journal of comparative physiology 183 (1998), S. 69-76 
    ISSN: 1432-1351
    Keywords: Key words Phenotypic plasticity ; Chemoreceptors ; Antenna ; Grasshopper ; Salicin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Grasshoppers, Schistocerca americana, reared from hatching on artificial diet had fewer sensilla on the antennae in the final larval stage than insects reared on lettuce. This was true of basiconic and coeloconic sensilla (presumed olfactory) and trichoid sensilla (presumed gustatory). The degree of difference varied along the antenna and with sensillum type. Adding salicin to the diet restored the numbers of all types of sensillum to levels equal to, or approaching, those in lettuce-fed insects. The addition of some volatile compounds – carvone (monoterpene), chalcone (flavonoid), citral (monoterpene) and guaiacol (phenolic) – resulted in slight increases in number, but coumarin (phenylpropanoid) had no effect. None of the compounds, either singly or in combination, produced more sensilla than were present in plant-fed insects.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 80 (1996), S. 125-131 
    ISSN: 1570-7458
    Keywords: sensory system ; neural interactions ; diet breath ; plant signals ; information processing ; herbivores
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The importance of attentional processing is summarized, and the different ways in which selective attention is maintained, explained. Examples from arthropods are highlighted. The significance of selective attentiveness for insect herbivores is discussed. In the finding and selecting of host plants, insects should adopt the strongest or most clear-cut cues that override noise, and they should channel the appropriate sensory information efficiently. It is argued that achieving this end is difficult and costly because the information capacity of the sensory system is far greater than the capacity of the central nervous system to process it. It is suggested that the need to obtain a clear signal quickly and efficiently may be one of the factors favoring reduced diet breadth, and that the existence of highly specific and sensitive receptor neurons is an adaptation to the information-processing problem.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 78 (1996), S. 1-8 
    ISSN: 1570-7458
    Keywords: induction ; imprinting ; learning ; caterpillar ; Lepidoptera ; experience ; diet breadth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This review discusses the ambiguity of results obtained from dual-choice feeding tests, especially in relation to the study of effects of experience. Induced preference experiments done this way can be caused by up to nine potential changes in caterpillar behavior. In addition different physiological mechanisms that could lead to the process of induced preference are discussed. These include habituation to deterrents, the increased ability to process xenobiotics, the acquisition of specific positive responses, sensitization, and associative learning. These different processes might relate to function in different ways so that distinguishing them is important to progress in understanding the phenomenon. Suggestions for experimental designs that provide details on processes involved are indicated.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1572-8889
    Keywords: Iridomyrmex humilis ; predation ; chemical defense ; nicotine ; Lepidoptera ; plant/insect interactions ; herbivore
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Experiments were performed to test the acceptability of two palatable, cryptic caterpillars, the tobacco hornworm,Manduca sexta, and the cabbage looper,Trichoplusia ni, reared on different diets, to the Argentine ant,Iridomyrmex humilis. Ants preferred larvae reared on artificial diet, groundcherry, or cowpea to tobacco-reared larvae. Ants also preferred larvae reared on artificial diet without nicotine to larvae reared on diet containing nicotine (5% dry wt). Experiments were also performed to test the response of ants to larval extracts and chemicals applied to the surface of palatable prey. Ants did not respond differently to larvae of the potato tuber moth,Phthorimaea operculella, treated with larval extracts or regurgitate from tobacco-reared larvae compared to artificialdiet-reared larvae, but ants were deterred byP. operculella larvae treated with nicotine compared to untreated larvae. The results of this study indicate that caterpillars can derive at least some degree of chemical protection from their food plant without sequestering and storing plant compounds and without the development of elaborate aposematic characteristics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1572-8889
    Keywords: herbivore ; grasshopper ; foraging ; Schistocerca americana ; novelty ; neophilia ; learning ; habituation ; nutrition ; diet mixing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We investigated mechanisms that could lead to incorporation of unpalatable foods into the diet of a generalist grasshopper, Schistocerca americana: nutritional stress, habituation, learning, and attraction to novelty. The model system involved mesquite, a palatable but inferior food, and mulberry, an unpalatable but adequate food. Nutritional stress, due to prolonged intake of the inferior food, mesquite, did not increase the acceptability of mulberry. Habituation to the deterrent compounds in mulberry and associative learning of the nutritional benefits of mulberry also did not occur. However, mulberry became more acceptable after a day of restriction to a single food type other than mulberry, and even deterrent and nutritionally worthless alternatives such as filter paper became acceptable after a day on any one food type. A tendency to feed on novel food types may be a proximate mechanism for the incorporation of relatively unpalatable, but nutritionally valuable foods into the diet. Novelty and the apparent need for diversity of foods are discussed in the context of exploratory foraging behavior by generalist herbivores.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...