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Étude en Laboratoire des Facteurs de Fécondité de Oryctes Monoceros Ol. et O. Rhinoceros L. (Col. Scarabaeidae) (*)

Étude en Laboratoire des Facteurs de Fécondité de Oryctes Monoceros Ol. et O. Rhinoceros L. (Col.... Summary Laboratory investigations of fecundity factors in Oryctes monoceros Ol. and O. rhinoceros L. (Coleoptera: Scarabaeidae) The continuous rearing performed since 1965 in La Minière of these two Oryctes species has required or resulted in studies about the main factors influencing longevity and fecundity of imagos: temperature, type of cage, substrate used for larval development or for egg-laying, quantity of food offered to the adults, number of individuals per enclosure. It was found that an ambient temperature of 28-80 °C was required, and a bored container with only a few holes of 20 l. capacity, one third filled with leaf mould or similar material, which retains moisture and allows the movement, mostly nocturnal, of the imagos. The highest fecundities are obtained from Oryctes reared in the larval state with a mixture of decayed wood and cow-dung or horse-dung and fed in the imaginal state with bananas slides renewed twice a week after the pairs are placed in the oviposition enclorures. The longevity and egg yield are about the same in isolated couples, or in grouped couples, when the enclosure volume is proportional to the total number of individuals. The 50 l. tank enclosing 8 or 10 couples has proved very convenient, because it requires less handling. Under these conditions, the mean longevity and fecundity of O. monoceros and O. rhinoceros are respectively 3 months and 5 months and 25 and 60 eggs, but wide individual differences are noticed in both species, which are neither related to the individual weight nor to the environment variability. As a rule, males die several weeks before females, but this does not prevent the eggs laid after their death being fertile, the spermatozoons retaining their fertilizing ability for three months in O. monoceros and 6 months in O. rhinoceros. The egg laying rates show considerable variability. The females begin to lay their eggs 2 or 3 weeks after the beginning of the rearing, the last eggs being laid 1 or 2 weeks before they die. On the whole, there is a positive, significant correlation between fecundity and longevity. The age of the adults at the time of mating affects neither number of eggs laid by female, nor the hatching rate. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annales de la Société entomologique de France (N S ) Taylor & Francis

Étude en Laboratoire des Facteurs de Fécondité de Oryctes Monoceros Ol. et O. Rhinoceros L. (Col. Scarabaeidae) (*)

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Publisher
Taylor & Francis
Copyright
© 1973 Société entomologique de France
ISSN
2168-6351
eISSN
0037-9271
DOI
10.1080/21686351.1973.12278129
Publisher site
See Article on Publisher Site

Abstract

Summary Laboratory investigations of fecundity factors in Oryctes monoceros Ol. and O. rhinoceros L. (Coleoptera: Scarabaeidae) The continuous rearing performed since 1965 in La Minière of these two Oryctes species has required or resulted in studies about the main factors influencing longevity and fecundity of imagos: temperature, type of cage, substrate used for larval development or for egg-laying, quantity of food offered to the adults, number of individuals per enclosure. It was found that an ambient temperature of 28-80 °C was required, and a bored container with only a few holes of 20 l. capacity, one third filled with leaf mould or similar material, which retains moisture and allows the movement, mostly nocturnal, of the imagos. The highest fecundities are obtained from Oryctes reared in the larval state with a mixture of decayed wood and cow-dung or horse-dung and fed in the imaginal state with bananas slides renewed twice a week after the pairs are placed in the oviposition enclorures. The longevity and egg yield are about the same in isolated couples, or in grouped couples, when the enclosure volume is proportional to the total number of individuals. The 50 l. tank enclosing 8 or 10 couples has proved very convenient, because it requires less handling. Under these conditions, the mean longevity and fecundity of O. monoceros and O. rhinoceros are respectively 3 months and 5 months and 25 and 60 eggs, but wide individual differences are noticed in both species, which are neither related to the individual weight nor to the environment variability. As a rule, males die several weeks before females, but this does not prevent the eggs laid after their death being fertile, the spermatozoons retaining their fertilizing ability for three months in O. monoceros and 6 months in O. rhinoceros. The egg laying rates show considerable variability. The females begin to lay their eggs 2 or 3 weeks after the beginning of the rearing, the last eggs being laid 1 or 2 weeks before they die. On the whole, there is a positive, significant correlation between fecundity and longevity. The age of the adults at the time of mating affects neither number of eggs laid by female, nor the hatching rate.

Journal

Annales de la Société entomologique de France (N S ) – Taylor & Francis

Published: Jan 31, 1973

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