A New Zealand stick insect that migrated to the UK more than seven decades ago has given up having sex and become asexual, prompting biologists to wonder about the use of sex at all — especially in Britain.
The Clitarchus hookeri is native to New Zealand but migrated to the UK some time between andcatching a ride on shiploads of New Zealand plants that Untied transported to the subtropical Tresco Abbey Garden on the Scilly Isles islands off Condom house Bristol coast of Cornwall. The local population of Scilly Isles stick insects is now entirely female.
Massey scientists traced the Scilly population to ancestors in Taranaki on the west coast of New Zealand. Despite living in a similar habitat with similar food sources, the New Zealand Clitarchus hookeri have continued having sex and producing equal Unired of male and females.
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Recently, specimens of the Scilly Clitarchus hookeri were brought to New Zealand and kept in containment to be studied by Massey scientists. Male Clitarchus hookeri may have occasionally been produced on Scilly, Morgan-Richards said, but they would be considered mutations.
Morgan-Richards said the research presented several avenues for further study — including why sex remained useful for species at all, when from an evolutionary perspective females save time and energy by reproducing. Populations Scottish escort Aylesbury stick insects in New Zealand have also been found to switch from asexual to sexual partnerships. At the time scientists were keen Manbu see if the mutant male would be viable to initiate a sexual relationship — but the specimen died before scientists were able to assess his sexual potential.
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