We wanted to tell a story of seasonal change in One Ocean and to show how small changes in temperature can have a big influence on marine life in the seasonal seas. Our team then began to investigate and discovered that a rise in sea temperature triggers the males to engage in territorial battles over the right to spawn, and more interestingly, that all the big males that fight were once females. Having studied marine biology it was no surprise to me that kobudai change their sex. After all it is a member of the wrasse family who are well known to exhibit sequential hermaphroditism, meaning that for them sex change at some point in their life is a normal biological process generally to aid reproductive success. In fact, sex change is a very common reproductive strategy in many fish.
‘wife swap’ stories
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What do you do when things get routine in the bedroom? Think about how many times you go to your favourite restaurant and vow to order something different, and then when it comes to the crunch you order the things you always do. What makes this tricky is we also seek out novelty, and I think that runs particularly true for many people when it comes to sex. Many couples assume when they meet, fall in love and make a commitment to be in a relationship, that the sex will just look after itself. Firstly, when we meet a new lover, our skin will come into contact with theirs and our body will get excited and recognise them as "someone new".
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Of the 4, or so species of mammals, only a handful of animals have ever been thought to mate for life. This short list of animals includes among others: gibbon apes, wolves, coyotes, barn owls, bald eagles, gorillas and barn swallows. And, according to Kevin McGraw, an Arizona State University life sciences professor who specializes in mating systems and rituals, only 3 to 10 percent of mammals are even socially monogamous.
January 17, Leonie the leopard shark has made a switch that could save her species — becoming the first shark recorded to change from sexual to asexual reproduction. Dr Christine Dudgeon of UQ's School of Biomedical Sciences, who documented the change at Townsville's Reef HQ Aquarium, said sharks could reproduce without a mating partner, but none with a recorded sexual mating history had ever made the change to asexual reproduction.