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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 31 (1984), S. 387-402 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary A detailed investigation of polyethism was carried out on a colony ofNeoponera (=Pachycondyla sensuBrown, 1973) obscuricornis, involving behavioural observations on its inhabitants, and subsequent dissection of each. Ovariant development in each ant was closely related to its social status. Ovaries are well developed among nuress and totally degenerate in foragers. This is the case in both gynes and workers, and ovarian polymorphism between the two castes is only weakly marked. The evolutionary implications of the observed relationships between nursing behaviour and reproductive ability are discussed.
    Notes: Resume L'étude détaillée du polyéthisme par l'observation des activités individuelles dans une société deNeoponera (=Pachycondyla sensuBrown, 1973)obscuricornis a été suivie de la dissection de tous les individus. L'état ovarien de chaque fourmi est en relation avec son statut social dans la colonie: développé chez les sogneuses, l'ovaire a complètement régressé chez les fourrageuses. Ce phénomène s'observe aussi bien chez les femelles que chez les ouvrières, seul un faible polymorphisme ovarient permettant de distinguer les deux castes. Les implications évolutives d'une liaison entre les conduites parentales et l'aptitude à la ponte sont discutées.
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  • 2
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary YoungFormica polyctena workers learn to know the specificity of cocoons surrounding them during the first days following their own hatching. The sensitiveness of antennae in the ethogenesis is studied by cutting off segments from both antennae on the very day of hatching. During the days following the operation, operated workers show a slower disposition for displacing cocoons, compared to the check sample. Later, when workers are mature, the operated lots are unable to discriminate offered cocoons and keep homospecific as well as heterospecific. In every case the loss of the terminal article, only, creates important perturbations with do not progress quantitatively very much with the following cuttings. A study of the sensorial anatomy of funiculus is concerned with two intracuticularsensilla (s. ampullaca ands. coeloconica) and on three extracuticularsensilla (s. basiconica, s. trichodea curvata and “thin hairsensilla”). It contains a statistical analysis of the repartition of these well known different kinds ofsensilla, along the funiculus. From the five considered categories, four are preferentially distributed on the terminal segments and generally on the distal segments of antennae. These ares. ampullacea, s. coeloconica, s. basiconica ands. trichodea curvata. Only, “thin hairsensilla” are an exception; their frequency distribution varies as the size of each segment. The research of relationships between those two series of results, is attempted and allows to consider the preponderance of the intracuticularsensilla. And besides, the analysis taking the functional disposition of these different chemoreceptors into account enables us to presume that the distance between receivers of “cocoon” stimulus does not matter very much forsensilla basiconica, but is very much important fors. trichodea curvata and intracuticularsensilla.
    Notes: Resume Les jeunes ouvrières deF. polyctena apprennent à reconnaitre la spécificité des cocons qui les entourent dans les jours qui suivent leur propre éclosion. Le rôle sensoriel de l'antenne dans l'éthogenèse est recherché en utilisant la technique des antennectomies bilatérales effectuées le jour même de l'éclosion. Durant les jours qui suivent l'opération, les ouvrières opérées manifestent une aptitude plus tardive à transporter les cocons. Plus tard, lorsque les ouvrières sont mûres, les lots opérés sont incapables de discriminer et conservent indistinctement cocons homospécifiques et cocons hétérospecifiques. La perte du seul article terminal est déjà à l'origine de perturbations importantes qui progressent assez peu quantitativement avec les sections suivantes. Une étude de l'anatomie sensorielle du funicule fut effectuée sur deuxsensilla intracuticulaires (s. ampullacea ets. cooloconica) et sur troissensilla extracuticulaires (s. basiconica, s. trichodea curvata et «soies fines»). Elle a consisté à analyser statistiquement la répartition de ces différents types desensilla, par ailleurs bien connus, le long du funicule. Sur les cinq catégories considérées, quatre sont réparties préférentiellement sur l'article terminal et en général sur les articles distaux de l'antenne. Il s'agit dess. ampullacea, s. coeloconica, s. basiconica ets. trichodea curvata. Seules, les «soies fines» font exception à cette règle: leur distribution varie dans le même sens que les dimensions de chaque article. La recherche de relations entre ces deux séries de résultats est tentée et permet d'envisager la prépondérence dessensilla intracuticulaires. Par ailleurs, une analyse tenant compte de la disposition fonctionnelle de ces différents chimiorécepteurs laisse supposer que la distance séparant les récepteurs du stimulus «cocon» importe peu pour lessensilla basiconica, alors qu'elle importe beaucoup pour less. trichodea curvata et lessensilla intracuticulaires.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 32 (1985), S. 109-116 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Trois colonies deNeoponera apicalis ont été observées lors d'une étude en nature. Dans cette espèce, chaque ouvrière pourvoyeuse prospecte et chasse solitaïrement dans un site individualisé pour lequel elle se spécialise sur de longues périodes. L'orientation des fourrageuses semble probablement reposer sur l'utilisation d'un repérage visuel. Durant le fourragement, il n'est jamais fait usage de processus de recrutement comme on l'observe chez d'autres Ponérines. Le «tandem running» a été observé seulement lors du déménagement spontané d'une colonie. Ceci révèle, à notre avis, une stratégie d'approvisionnement originale et primitive chez les fourmis.
    Notes: Summary An investigation of field foraging in colonies ofNeoponera apicalis is reported. We observed that workers develope an individualized foraging strategy with a high degree of regional specialization that persists for extended periods. The use of visual cues seems to constitute the basis for the spatial orientation. No recruitment was never observed during foraging as in other Ponerine ants, tandem running was only seen during a natural translocation of a colony. These observations reveal a primitive and original food-supply strategy in ants.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 39 (1992), S. 425-438 
    ISSN: 1420-9098
    Keywords: Formicidae ; Nothomyrmecia ; evolution ; sociogram ; ethogram ; recognition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Results of laboratory-based ethological studies on twoNothomyrmecia macrops colonies with individually marked workers are reported. Interactive behavioural acts constituted less than 1% of all those recorded, revealing a strong tendency by the ants not to engage in social contact. Very few workers performed queen-directed acts. They stayed near the queen, though seldom in direct contact. Division of labour was otherwise barely apparent, except that some individuals showed a propensity to guard the nest entrance. No exchange of food was observed between workers, workers and queen, or adults and larvae (apart from worker placement of prey items with larvae). A queen fed from aDrosophila carcass retrieved from the nest floor, without assistance from workers. Systematic scanned observations confirmed levels of inactivity higher than previously observed in ants (comprising almost 2/3 of recorded behavioural acts). The time budget for activities directed toward the immature stages was the same in both colonies, and fluctuated during the circadian period. Non-nestmate larvae added to worker groups were more frequently licked than nestmate larvae, but this might not involve the particular recognition of nestmateversus non-nestmate brood. These observations support the hypothesis thatNothomyrmecia is primitively eusocial, and of special significance in myrmecology.
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Animal Behaviour 36 (1988), S. 1389-1399 
    ISSN: 0003-3472
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Animal Behaviour 26 (1978), S. 1064-1071 
    ISSN: 0003-3472
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1939
    Keywords: Foraging benefit ; Capture rate ; Competition tate ; Food flow ; Foraging area
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A model of individual foraging in social insects as presented that formalises the dynamics of foraging and concentrates on the collective rather than the individual benefit, quantifying the relationships between a colony's foraging area, number of foragers and foraging energy budget and the food sources' rate of arrival, disappearance and capture. A series of experiments, in which a number of prey were offered to colonies of the individually foraging antPachycondyla (ex-Neoponera) apicalis confirm the hypotheses implicit in the model and measured the rates of capture and competition. 60 days observation of 3P. apicalis colonies' foraging activity are summarised and used in conjunction with the model to obtain estimations of the density and rate of arrival of available prey in the foraging area. We examine how a colony's foraging benefit may be influenced by its foraging area, the number of foragers, and the forager/non-forager ratio and show that a colony's jocial structure strongly limits its potential foraging benefit. Within these limits,P. apicalis does not appear to be an optimal forager.
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  • 8
    Publication Date: 1989-03-01
    Print ISSN: 0029-8549
    Electronic ISSN: 1432-1939
    Topics: Biology
    Published by Springer
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