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  • 1
    Electronic Resource
    Electronic Resource
    Importance of fungi in the diet of Gammarus pulex and Asellus aquaticus (1993)
    Springer
    Oecologia 96 (1993), S. 304-309 
    Details
    ISSN: 1432-1939
    Keywords: Food quality ; Growth ; Energy budgets ; Gammarus pulex ; Asellus aquaticus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An important component of the interaction between macroinvertebrates and leaf litter in streams in the extent to which consumers can differentiate between undecomposed and decomposing leaves. The detritivores Gammarus pulex and Asellus aquaticus fed preferentially on conditioned rather on unconditioned leaf material. Growth in A. aquaticus was significantly reduced when unconditioned leaves were provided, but in G. pulex no significant effect of conditioning on growth was observed. The capacity of G. pulex to tolerate reductions in food quality seems to be a consequence of a compensatory system in which respiration rates change to compensate for reductions in food quality. In this way a constant growth rate is maintained. Increases in ingestion rates to compensate for low quality food were not observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317498
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Importance of fungi in the diet of Gammarus pulex and Asellus aquaticus I: feeding strategies (1993)
    Springer
    Oecologia 93 (1993), S. 139-144 
    Details
    ISSN: 1432-1939
    Keywords: Detritivores ; Trophic biology ; Gammarus pulex ; Asellus aquaticus ; Food choices ; Niche breadth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The importance of fungi in the trophic biology of the freshwater detritivores Gammarus pulex and Asellus aquaticus was investigated. Inspection of leaves used in feeding trials indicated that whereas A. aquaticus scrapes at the leaf surface, G. pulex bites through the leaf material. Both species discriminated between fungal mycelia, fungally colonized and uncolonized leaf material but, although A. aquaticus selectively consumed fungal mycelia, G. pulex fed preferentially on leaf material. Fungi appear to be an important food source for A. aquaticus and selection of food material was positively correlated with fungal biomass. In contrast, for G. pulex, fungi appear to be more important as modifiers of leaf material. However, no significant correlations were found between food preference and any of the leaf modifications measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00321203
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Comparative ecology of Gammarus pulex (L.) and Asellus aquaticus (L.) I: population dynamics and microdistribution (1994)
    Springer
    Hydrobiologia 281 (1994), S. 155-162 
    Details
    ISSN: 1573-5117
    Keywords: Asellus aquaticus ; Gammarus pulex ; population dynamics ; microdistribution ; coexistence ; detrivores
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Gammarus pulex and Asellus aquaticus generally occupy different zones in rivers; the former occurs in upper reaches but is ‘replaced’ by the latter in lower reaches. Microdistribution and life-history patterns of G. pulex and A. aquaticus in sympatry and allopatry, were analyzed. Both species exhibited similar patterns of microhabitat selection, with larger individuals associated predominantly with large-sized substratum particles, and juveniles with weed. Coexisting populations of G. pulex and A. aquaticus had similar densities and population dynamics. Within each species, differences in population dynamics of allopatric and sympatric populations were observed. Although variation in population dynamics of G. pulex may be explained in terms of competition between the two species, the evidence is weak and equivocal. Differences in the dynamics of the two A. aquaticus populations were possibly a consequence of coal-mine and organic pollution, reducing the survival of offspring in the allopatric population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028678
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Comparative ecology of Gammarus pulex (L.) and Asellus aquaticus (L.) II: fungal preferences (1994)
    Springer
    Hydrobiologia 281 (1994), S. 163-170 
    Details
    ISSN: 1573-5117
    Keywords: Asellus aquaticus ; Gammarus pulex ; coexistence ; detritivores ; competition ; aquatic hyphomycetes ; food preferences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper continues to explore niche differentiation in Gammarus pulex and Asellus aquaticus by analysis of their food preferences. Individuals from both species discriminated between leaf discs colonized by different fungal species and exhibited strong preferences for Anguillospora longissima and Heliscus lugdunensis. Fungal preferences were not correlated with the relative abundance of fungi in the field and there was considerable intra-population variability in food preferences — both between individuals and for the same individual through time. Niche overlap between animals from all four study populations was high and there was no evidence of differences in the potential trophic niches of animals from sympatric and allopatric populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028679
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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