Termites indulge in both sexual and asexual reproduction

March 27th, 2009 - 2:39 pm ICT by ANI  

Washington, Mar 27 (ANI): When it comes to sex, certain female termite “primary queens” can reproduce both sexually and asexually during their lifetimes, according to a new study.

The collaborative study by scientists at North Carolina State University and three Japanese universities revealed that the asexually produced babies mostly grow to be queen successors - so-called “secondary queens” - that remain in the termite colony and mate with the king.

Such asexual reproduction produces large broods of babies without the dangers of inbreeding, as secondary queens have no genes in common with the king.

And research has shown that babies produced the old-fashioned way-between either the primary or secondary queens and the king-are mostly workers and soldiers of both genders.

Dr. Ed Vargo, associate professor of entomology at NC State and a co-author of the paper, has said that the species of subterranean termite the team studied, Reticulitermes speratus, is an important economic pest in Japan and is in the same genus as termites found in North Carolina.

Termite colonies are generally founded, and then sustained by a primary king and primary queen.

During the study, the scientists collected termites from a number of different colonies in Japan. In many colonies, the primary queen was not present, but had been seemingly succeeded by numerous secondary queens. Most primary kings, meanwhile, were present in the colonies.

According to Vargo, this suggests that the primary kings live longer than the primary queens, so there is a strong need for these termites to have genetically diverse queen successors to grow the colonies efficiently.

Genetic analysis of termite populations in several colonies showed that secondary queens shared genes with primary queens but not with primary kings, suggesting asexual reproduction.

At the same time, male and female termite workers and soldiers had genetic traces of both the primary king and primary queen, suggesting sexual reproduction.

“The conditional use of sex is unusual in insects and was previously unknown in termites. This novel use of both sexual and asexual reproduction is a way for primary queens to maximize reproductive output allowing the colony to grow bigger and faster while maintaining genetic diversity and avoiding the disadvantages of inbreeding,” said Vargo.

He also said that learning more about the genetics behind reproduction could lead to ways of preventing the production of certain castes of termites or ways of knocking out certain gene functions in those castes.

The study has been published in the journal Science. (ANI)

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