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  • 1
    Electronic Resource
    Electronic Resource
    Ecological resistance to the invasion of a freshwater clam, Corbicula fluminea: fish predation effects (1988)
    Springer
    Oecologia 77 (1988), S. 445-452 
    Details
    ISSN: 1432-1939
    Keywords: Corbicula fluminea ; Fish predation ; Invasion ; Colonization ; Freshwater communities
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Fish predation is shown to have a twenty nine fold effect on the abundance of the invasive freshwater clam, Corbicula fluminea, in a Texas reservoir. This predation has prevented the clam from establishing the high densities commonly reported for it elsewhere. The high magnitude of the fish effect is attributed to Corbicula being an invader to this reservoir and not being able to cope well with the mix of resident fish species. In the absence of fish, colonization of the reservoir by Corbicula is spatially patchy. When fish interact with these clams, they remove sufficient numbers of individuals from dense patches to create the appearance of a spatially uniform distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377258
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The ecological role of caudal lamellae loss in the larval damselfly, Ischnura posita (Hagen) (Odonata: Zygoptera) (1991)
    Springer
    Oecologia 87 (1991), S. 1-7 
    Details
    ISSN: 1432-1939
    Keywords: Autotomy ; Cannibalism ; Aquatic insects ; Predator avoidance ; Microhabitat selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Damselfly larvae may autotomize and regenerate any of their 3 caudal lamellae. At least one missing or regenerating lamella was evident in 50.1% of field collected Ischnura posita larvae. Lamellae loss during molting is very infrequent (1 out of 117 recorded molts). Laboratory trials indicate that conspecifics remove lamellae and that this process is density dependent. The percentage of larvae losing lamellae during 24 h trials ranged from 73.5 at the highest density tested to 17.3 at the lowest density. I. posita larvae are cannibalistic. The presence of lamellae reduces an individual's chance of being cannibalized. More than twice as many final instar lamellae-less larvae were cannibalized during 24 h trials than analogous individuals having 3 lamellae at experimental initiation. Costs are also associated with lamellae autotomy. 1) Although individuals without lamellae can swim they are more reluctant to release from a wooden stalk and swim when threatened (9% release) than are larvae with lamellae (29% release). Since swimming is part of their repertoire of anti-predator behaviors this behavioral shift should be detrimental. 2) Caudal lamellae function in O2 uptake. Trials were conducted with larvae having and not having lamellae in an experimental horizontal oxygen gradient system. Relative to larvae without lamellae, those with lamellae preferred deeper depths at PO2 values greater than 70 torr. Many lamellae-less larvae distributed themselves at the water surface throughout the range of PO2 values tested. Differential depth distribution between larvae with and without lamellae is highly significant (P 〈 0.01).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323773
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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