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Potential Lifetime Fecundity and the Factors Affecting Annual Fecundity in Urodacus Armatus (Scorpiones, Scorpionidae)

G. T. Smith
The Journal of Arachnology
Vol. 18, No. 3 (Autumn, 1990), pp. 271-280
Stable URL: http://www.jstor.org/stable/3705433
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Potential Lifetime Fecundity and the Factors Affecting Annual Fecundity in Urodacus Armatus (Scorpiones, Scorpionidae)
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Abstract

The ovariuterus of Urodacus armatus had three types of diverticula, Rudimentary (RD), Embryonic (ED) and Post Partum (PPD). The data suggested that all the ova were developed and enclosed in RDs by the time a female reached maturity and that the sum of the diverticula gave a measure of the potential lifetime fecundity. Samples from two populations in two consecutive years were not significantly different and the combined mean for all diverticula was 56.7 ± 8.22. Annual fecundity (number of EDs) did not differ between populations or years and the combined mean was 8.3 (range 4-12). Fecundity was not significantly influenced by female condition $(\root{3}\of{\text{Mass}/\text{carapace / length}})$, length of ovariuterus or the total number of diverticula. However, size and age had significant effects. The simplest adequate model explaining the variation was given by the equation log ED = 0.9656 - 0.07003 Age + 0.01839 Carapace length. Data on age-related fecundity and total diverticula suggested that females may have from 5 to 12 litters in a lifetime.

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