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  • 1
    Electronic Resource
    Electronic Resource
    Structure of an interleukin-1.beta. mutant with reduced bioactivity shows multiple subtle changes in conformation that affect protein-protein recognition (1993)
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 8749-8757 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00085a005
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ecological costs and benefits of communal behavior in a presocial spider (1983)
    Springer
    Behavioral ecology and sociobiology 13 (1983), S. 107-114 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Philoponella oweni (Uloboridae) is a facultatively communal spider found in the southwestern United States. Solitary females and communal groups of females coexist in the same habitats. Communal females are known to produce more eggs than solitary females. Communal females might acquire the energy for the production of additional eggs by one of three means: they might have a longer life span, and thus more time in which to acquire energy; web maintenance might be more efficient in a communal group; or communal females might spend more time feeding. Field data from a marked population in Arizona showed the third alternative was true. Two possible causes for the greater time spent feeding by communal females were investigated; either the communal web or group is a more efficient trap for insects, or the communal groups are located at sites where insects are more abundant. Analysis of feeding rates and sticky trap data confirmed the second alternative. Potential web attachment sites are limited in some habitats, and mortality during dispersal is very high. When potential web attachment sites are scarce more of the population is found in communal groups; when they are abundant more of the population is solitary. The pattern of dispersal and overwintering is this species suggests that females renewing a colony in the spring could be related.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293800
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Reproductive success of solitary and communal Philoponella oweni (Araneae: Uloboridae) (1982)
    Springer
    Behavioral ecology and sociobiology 11 (1982), S. 149-154 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Philoponella oweni (Uloboridae) is a facultatively communal orb-web spider found in arid regions in the southwestern United States. Within one habitat solitary adult females and communal groups of adult females coexist. This study compared the reproductive output (egg production) and reproductive success (production of live offspring) of solitary and communal females. There was no significant difference in the mean number of egg-cases produced by solitary and communal females, but communal females produced significantly more eggs per egg-case. However, communal females suffered significantly higher rates of egg-case parasitism from the pteromalid wasp Arachnopteromalus dasys. As a result, the mean number of liver offspring produced by solitary and communal females did not differ. Thus, both strategies led to roughly equal reproductive success. The advantages of aggregation of adults may be significant in the evolution of social behavior in spiders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300057
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    Paper (German National Licenses)
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