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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of the spatio-temporal niche of foraging grassland ants in the field (1990)
    Springer
    Insectes sociaux 37 (1990), S. 1-13 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume L'activité d'affouragement de 4 genres (6 espèces) de fourmis de prairie (Formica rufibarbis, Tapinoma erraticum, Myrmica schenki, M. sabuleti, Tetramorium caespitum etT. impurum) a été observée au cours des mois de juin–juillet 1985 à Treignes (Belgique). L'activité des fourrageuses sur le terrain est estimée par des observations séquentielles de flux d'ouvrières pendant 30 secondes à travers le périmètre de quadrats de 0,5×0,5m. Les vitesses de déplacement des fourmis sur le terrain ayant aussi été mesurées, les flux sont transformés en densités de fourrageuses. Ces dernières sont cartographiées et étudiées en fonction de paramètres climatiques. Elles sont ensuite soumises à une analyse des niches écologiques. Les quatre genres étudiés occupent des niches réalisées qui apparaissent bien séparées sur la seule base de la répartition spatio-temporelle de leur activité diurne d'affouragement.
    Notes: Summary The foraging activities of four genera (six species) of grassland ants (Formica rufibarbis, Tapinoma erraticum, Myrmica schenki, M. sabuleti, Tetramorium caespitum andT. impurum) were observed in June–July 1985 at Treignes (Belgium). Foraging activity was assessed by taking sequential records of foragers' fluxes during 30 seconds through the perimeter of 0.5×0.5m adjacent field quadrats. The ants' velocities were also measured in the field; knowing their fluxes, it was possible to calculate the densities of foragers. The latter were mapped and studied as a function of climatic parameters, to understand the niche relationships of these ants. Regarding their diurnal spatio-temporal foraging activities, the four genera were found to occupy well separated realized niches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02223811
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Growth and demography ofCubitermes speciosus mounds (Isoptera, Termitidae) (1996)
    Springer
    Insectes sociaux 43 (1996), S. 189-200 
    Details
    ISSN: 1420-9098
    Keywords: Cubitermes speciosus ; Isoptera ; Termitidae ; mound demography ; mound growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The growth and demography ofCubitermes speciosus mounds were studied in an equatorial forest ecosystem near Kisangani, Zaïre. The mounds were censused and measured on eight occasions from June 1985 to January 1993 on 25 plots of 100 m2. Mounds were found to grow in two ways: either they were enlarged sporadically, leading to a correlation between age and size; or they were no longer enlarged after a 2-year period of initial growth, which means that both large and small mounds can be old. The number of living mounds was fairly constant: it varied between 112 and 152 ha−1 with an average of 139 ha−1, and about a quarter of them were renewed each year. However, a clear tendency was observed over our 7.5-year observation period: the average size of the mounds increased regularly and was 2.7 times larger in 1993 than in 1985. Monthly birth and death rates were estimated using a model of continuous growth. Life expectancy at the age of 3 months was estimated from a survivorship curve at 3.5 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242570
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  • 3
    Electronic Resource
    Electronic Resource
    On testing temporal niche differentiation in carabid beetles (1989)
    Springer
    Oecologia 81 (1989), S. 89-96 
    Details
    ISSN: 1432-1939
    Keywords: Niche differentiation ; competition ; Statistical inference ; Phenology ; Carabid beetles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary It is first shown that den Boer's (1985) claims that competition should be rejected as a factor explaining community structure are not warranted by his tests on temporal niche differentiation in carabid beetles. The power of these tests is so low that they are unlikely to detect even the most extreme pattern of niche differentiation. A major factor that affects their power is the procedure of building up an artificial species pool from the local communities to which the test is to be applied. Alternative tests are then presented, and applied to data on annual activity cycles of carabids in three forest biotopes in Belgium. Three factors are shown to strongly affect their outcome: the unit into which the time scale is divided, the criteria used to incorporate constraints, and the set of species selected. Nevertheless, they provide some evidence that there is a growing niche differentiation from the successional to the climax forest, as predicted by competition theory. Other hypotheses, however, could explain the observed pattern.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377014
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  • 4
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    On testing temporal niche differentiation in carabid beetles (1989)
    Springer
    Details
    Publication Date: 1989-01-01
    Print ISSN: 0029-8549
    Electronic ISSN: 1432-1939
    Topics: Biology
    Published by Springer
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  • 5
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    Which functional processes control the short-term effect of grazing on net primary production in grasslands? (2001)
    Springer
    Details
    Publication Date: 2001-09-01
    Print ISSN: 0029-8549
    Electronic ISSN: 1432-1939
    Topics: Biology
    Published by Springer
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