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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 79 (1992), S. 424-424 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 75 (1988), S. 208-209 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 76 (1989), S. 26-27 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 39 (1992), S. 347-350 
    ISSN: 1420-9098
    Keywords: Colonization ; survivorship ; Brazil ; Acromyrmex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Patterns of colonization by queens and incipient nest survival of the leaf-cutting antsAcromyrmex niger andAcromyrmex balzani were studied by means of belt transects and individually marked incipient nests. No relation was found between colony density and the number of colonization attempts. Both species are not claustral, and high rates of queen mortality were attributed to conspecific executions and predation. Of other discernable mortality factors, failure of fungal garden establishment was the most important. Only 34 of 296A. balzani and 13 of 154A. niger marked colonies were alive at the end of one year. These figures are higher than those reported for species ofAtta. These results are contrasted with those of claustral-foundingAtta species. Small colonies are occasionally raided by larger colonies which robbed brood.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 34 (1987), S. 227-227 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 40 (1993), S. 137-145 
    ISSN: 1420-9098
    Keywords: Myrmecophyte ; Amazon ; ant ; mutualism ; herbivory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The species combinations of myrmecophytic plants were compared in three different, neighboring local central Amazon forest sites. The proportional contribution of myrmecophytes in each setting varied significantly, withMaieta guainensis being the most abundant in each locality. This pattern resulted in low site similarity values. Other recorded species wereHirtella physophora, Tachigalia myrmecophila, Duroia sp.,Tococa sp., andCordia nodosa. Little variability was found with respect to associated ants that inhabited the myrmecophytes, and mutual entropies indicated a high degree of mutualistic interactions. However, for the majority of myrmecophytes, no differences in herbivore damage levels could be attributed to the presence of ants, with onlyM. guianensis andT. myrmecophila demonstrating significantly lower damages when inhabited by ants. Their respective ant associates,Pheidole minitula andPseudomyrmex concolor, were thus the only plant-ants with a demonstrable ability to reduce the levels of herbivory in their host plant.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Les cycles d'activité annuels des fourmis-charpentières et des termites souterrains ont été déduits des relevés poursuivis par le service coopératif des entomologistes dans le Connecticut, le Maryland, le New Jersey, la Caroline du Nord et l'Ohio. Les autocorrélations suggèrent une forte structure cyclique des plaintes issues du public, avec une régularité augmentée du sud au nord. L'analyse spectrale révèle que les Etats les plus au nord présentaient des pics de plaintes à des fréquences plus grandes, alors que les Etats plus au sud avaient des fluctuations de fréquences plus courtes, comme on pouvait s'y attendre si les facteurs climatiques réglaient le système. De tels résultats peuvent être de grande valeur pour les expériences conduites dans la nature.
    Notes: Summary Annual activity cycles of carpenter ants and subterranean termites were extracted from data maintained by cooperative extension service entomologists in Connecticut, Maryland, New Jersey, North Carolina and Ohio. Autocorrelations suggested a strong cyclic patterning of public complaints, which increased in regularity from south to north. Spectral analysis revealed that the more northern states had complaint peaks occurring at longer frequencies, while more southern states had shorter frequency fluctuations, as expected if climatological factors drive the system. The existence of data such as these can be of great value in designing field experiments.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Feldstörungen an Mähenkraft von Kontinuierlich polymorphischen “Rossameisen”,Camponotus pennsylvanicus, wurden über eine zweijährige Periode geführt, um die Kolonieantwort abzuschätzen. Das Verhältnis der kleineren Arbeiterinnen waren an die Mähenkraft gemindert, in dem man sie mit dem Wachstumregulator RO-13-5223 futterte. Die Kolonien, die diesen sowie den Insektwachstumregulator “Methopren” bekamen, auf grossere Veränderungsfaktoren in morphischen Kastenproportionen als in Kontrollkolonien-besonders während des zweiten Beobachtungsjahres-auf. Keiner der beiden Wachstumregulatoren könnten aufzeigen, dass sie die Mähenintensität der Kolonien beeinflussen konnten. Simulierte Ausbeutungsversuche wurden während des zweiten Jahres geführt. Solche simulierte Ausbeutung führten zur Abminderung der Mähenintensität jener Kolonien unter schwerer Ausbeutungsbehandlung. Obwohl das Surchschnittverhältnis ziemlich stabil blieb, die Kolonien, die zur simulierten Ausbeutung ausgesetzt wurden, zeigten einen abfallenden Veränderungsfaktor im Kastenverhältnis, wenn man sie mit den Kontrollkolonien verglichen. Mit diesen Ergebissen Kann man vermuten, dass Unterbrechungen zur Wechsel an die morphischen Kastenverhältnisse und solche Verhältnisse von Mähenkraft der Sozialkontrolle unterliegt, und durch die Kolonie selbst manovriert wird.
    Notes: Summary Field perturbations of the foraging force of the continuously polymorphic carpenter ant,Camponotus pennsylvanicus, were conducted over a two-year period to evaluate colony responses. Feeding the insect growth regulator RO-13-5223 resulted in a decrease in the mean proportion of smaller workers in the forager force, colonies receiving this growth regulator, and the insect growth regulator Methoprene, exhibited greater coefficients of variation in morphic caste proportions than found in control colonies, especially during the second year of the study. Neither insect growth regulator could be demonstrated to affect the foraging intensity of the colonies. Simulated predation experiments were conducted during the second year. Simulated predation resulted in decreased foraging intensity in those colonies under the most severe predation treatments. Colonies subjected to simulated predation exhibited decreased coefficients of variation in morphic caste proportions when compared with control colonies, although the mean proportions remained nearly equal. These results suggest that disruptions can lead to changes in the morphic caste ratios of foragers, and that the caste ratios of the foraging force are under social control, and are manipulated by the colony.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die MaulwurfsgrilleScapteriscus borellii kommt in Flußauen im mittleren Bereich des Bundesstaates Sâo Paulo vor. Sie verzehrt regelmäßig kleine, unterirdische Ameisen, hauptsächlich von Arten der GattungSolenopsis (Diplorhoptrum). Im Laborversuch wurde gezeigt, daßS. borellii von diesen Ameisen sowohl räuberisch lebt, als auch tote Tiere aufnimmt.
    Notes: Summary The mole cricket,Scapterscus borellii, occurs in riverine habitats of central São Paulo state, where they have been found to regularly consume small subterranean ants, principally species ofSolenopsis (Diplorhoptrum). In laboratory experiments, it was shown thatS. borellii is a predator, and also might be a scavanger of these ants.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 34 (1987), S. 204-210 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Les coefficients deFisher (mesure de l'asymétrie et d'aplatissement) sont utilisés pour évaluer les forces sélectives agissant sur les colonies de fourmis charpentièresCamponotus ferrugineus etC. pennsylvanicus. Approximativement 10% des colonies montrent un écart significatif, à la normale pour deux mesures de la tête qui sont utilisées habituellement pour quantifier le polymorphisme des ouvrières. Ces résultats montrent le soin particulier qui doit être apporté dans l'extrapolation des courbes de polymorphisme aux analyses comportementales. Ils. suggèrent ègalement que l'histoire d'une colonie de fourmis charpentières peut être marquée par des événements sélectifs alátoires. La présente méthode doit s'avérer particulièrement utile dans les expériences portant sur la composition des colonies en différents types d'ouvrières.
    Notes: Summary The statistical moments of skewness and kurtosis were used to evaluate the selection history of field collected colonies of the carpenter ants,Camponotus ferrugineus andC. pennsylvanicus. Approximately 10% of all colonies demonstrated joint significance in departure from normality in two head measurements normally used to evaluate worker polymorphism. These results suggest that care must be taken when extrapolating worker polymorphism curves in behavioral research. These results also suggest that the colony histories of carpnter ants may be marked by stochastic selection processes. The application of this method is recommended for studies in which worker caste composition is manipulated.
    Type of Medium: Electronic Resource
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