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Population Structure and Fluctuation

  • Michael R. Warburg

Abstract

Our present knowledge on the population dynamics of isopods is based on studies of a limited number of isopod species (15), which represent only a few families (see Table X in Warburg et al. 1984). A typical characteristic of population structure is the large number of young within a population. At times they comprise the bulk of the isopod population in any single location (Sutton 1968; Sunderland et al. 1976). However, there is a large variation in the number of juveniles produced per year (Al-Dabbagh and Block 1981). The population structure changes from a bimodal pattern when the mancas leave the marsupium to a unimodal one when they grow and mature. The lowest densities are observed just before recruitment of the young (Kheirallah and Omran 1986). This change may last for a few months or up to a year and was observed in several species: Cylisticus convexus (Hatchett 1947), Armadillidium vulgare (Paris and Pitelka 1962; Al-Dabbagh and Block 1981), Ligidium japonicum (Saito 1965), Trichoniscus rathkei (Breymeyer and Brozozowska 1967), T. pusillus (Sutton 1968; Phillipson 1983) and Hemilepistus reaumuri (Shachak et al. 1979).

Keywords

Population Structure Population Explosion Terrestrial Isopod Isopod Species Porcellio Scaber 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1993

Authors and Affiliations

  • Michael R. Warburg
    • 1
  1. 1.Technion, Department of BiologyTechnion CityHaifaIsrael

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