You look delicious, baby. Male guppies drive the females wild by resembling tasty orange fruits. A box of chocolates is nice enough, but if you really want to win a girl's heart, you might take a cue from male guppies and go one step further.
Sexual harassment from male guppies is so bad that long-suffering females will risk their lives to escape it, according to new research from Dr Safi Darden and Dr Darren Croft from Bangor University. Male guppies spend most of their time displaying their brightly-coloured bodies to females in the hope of attracting a mate. The choosy females will usually only mate with the most attractive, high-quality males to ensure the production of strong offspring.
Guppies are extremely popular aquarium fish that give birth rather than lay eggs and have been used for much behavioral research, including on breeding behaviors. Males have a modified anal fin, the gonopodium, that is similar in function to a penis. When breeding, the male approaches and thrusts his gonopodium into a female, ejecting one or more balls of sperm.
Guppies are popular pets and make attractive additions to a home aquarium. Male and female guppies will reproduce quickly once they mate, though guppies are known to eat their young. You can identify male and female guppies fairly easily once they are at least one week old. Compare their body colors and patterns.
We've seen in our simulations that the more brightly colored a male guppy is, the more likely he will be seen -- and eaten -- by a predator. In a simulation or in the wild, where predators are plentiful, male guppies become increasingly drab over generations, pushed by predation pressure toward greater camouflage. So if camouflage confers such an obvious survival benefit to prey species like guppies when it comes to predator avoidance, what possible advantage could there be to sporting colors and patterns that make an individual more conspicuous?
The novel object recognition NOR test is a widely-used paradigm to study learning and memory in rodents. NOR performance is typically measured as the preference to interact with a novel object over a familiar object based on spontaneous exploratory behaviour. In rats and mice, females usually have greater NOR ability than males.
February 14, Male guppies pay a high cost for their sexual harassment of female guppies — including much higher mortality rates — a new study from Macquarie University has found. Sexual harassment in guppies, or unwanted male attention, is a product of males attempting to mate as many times as possible due to the low energy cost of sperm production.
The guppy Poecilia reticulataalso known as millionfish and rainbow fish is one of the world's most widely distributed tropical fishand one of the most popular freshwater aquarium fish species. It is a member of the family Poeciliidae and, like almost all American members of the family, is live-bearing. They are highly adaptable and thrive in many different environmental and ecological conditions. Wild guppies generally feed on a variety of food sources, including benthic algae and aquatic insect larvae.
Sex chromosomes regularly evolve suppressed recombination, distinguishing them from other chromosomes, and the reason for this has been debated for many years. It is now clear that non-recombining sex-linked regions have arisen in different ways in different organisms. A major hypothesis is that a sex-determining gene arises on a chromosome and that sexually antagonistic SA selection sometimes called intra-locus sexual conflict acting at a linked gene has led to the evolution of recombination suppression in the region, to reduce the frequency of low fitness recombinant genotypes produced. The sex chromosome system of the guppy Poecilia reticulata is often cited as supporting this hypothesis because SA selection has been demonstrated to act on male coloration in natural populations of this fish, and probably contributes to maintaining polymorphisms for the genetic factors involved.