04 November, 2020

A new study on scorpion life history traits and the effect of different feeding regimes


There is not much published on the life history traits in scorpions and especially on the influence of different feeding regimes. Michael Seiter and co-workers have recently published a study investigating the embryonic and postembryonic development in the species Tityus neibae Armas, 1999 (Buthidae) exposed to different feeding regimes. 

The results indicated a strong relationship between different feeding regimes, sex, morphometrics and life stages. Se abstract or article for further details.

Scorpions often experience food shortages, yet information on their baseline nutritional input is lacking. In many life histories, there is a trade-off between adult size and development time that is interrelated with food availability. We present precise data on the influence of two different feeding regimes that affect development in the buthid scorpion Tityus neibae. The results indicate a strong relationship between the treatment group, sex, morphometrics and life stages. The different diet inputs had no influence on the embryonic development or the litter size but had a major effect on the postembryonic development time and on the life stage when individuals reached maturity. No females or males reached maturity by the 4th instar when fed every two weeks and only males that were fed weekly were able to reach maturity by the 4th. Thus, a trade-off in T. neibae males is apparent, since they can reach maturity earlier in life, resulting in an overall smaller body size that may reduce the risk of predation. By contrast, females may have been selected to reach full development with an overall larger body size that results in an increase in the fitness, the number, or the size of the offspring.

Seiter M, Mosetig L, Milasowszky N. The trade-off between adult size and development time due to different feeding regimes in the scorpion Tityus neibae. Invertebrate Reproduction & Development. 2020:1-7. [Subscription required for full text]

Thanks to Michael Seiter for sending me their article!

No comments: