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  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    A comparative study on the movement patterns of two sympatric tropical chitons (Mollusca: Polyplacophora) (1983)
    Springer
    Marine biology 74 (1983), S. 115-125 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The individual positions of 200 intertidal chitons [Acanthopleura brevispinosa (Sowerby) and A. gemmata (Blainville)] were recorded throughout 55 low tides on a Somalian shore, using a discrete sampling method. Both species feed during nocturnal low tide and rest during the day and high tide. Due to this activity rhythm, individual positions recorded during diurnal and nocturnal low tides give information on the rest habits of the chitons and on their movements, respectively. The resting and feeding fixes were analyzed with two new complementary methods. Both species show a distinct homing behaviour with periodical shift to new homes more frequent in A. brevispinosa than in A. gemmata. The latter species shows a stronger constancy to its feeding ground. The two species differ most in the orientation and length of their excursions. Due to their different movement pattern the two species minimize zonal overlapping during the night, which in turn reduces the interspecific competition for food.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00413914
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental study and modelling of food recruitment in the antTetramorium impurum (Hym. Form.) (1983)
    Springer
    Insectes sociaux 30 (1983), S. 347-360 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Une étude du recrutement global, menée chezTetramorium impurum, a mis en évidence ses principales caractéristiques. La croissance de la population participant au recrutement est de typè logistique. De plus, des oscillations amorties sont observées. Celles-ci ont deux origines: les délais temporels dans les recrutements et l'effet de l'encombrement à la source. Un modèle mathématique permettant de reproduire ces différents effets et de quantifier les paramètres pertinents est présenté.
    Notes: Summary A study of global recruitment inTetramorium impurum has shown its main characteristics. The growth of population in the neighbourhood of the food source is a logistic curve. Damped oscillations are observed. These oscillations are the result of time delay in recruitment and crowding around the food source. A mathematical model is able to reproduce these different effects and it allows one to identify and give quantitative values to pertinent parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02223992
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    Paper (German National Licenses)
    Fulltext
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