Indian, Belgian and US researchers have discovered in frogs previously unknown method of fertilization. The study is published in the journal PeerJ
The reproductive behavior of South Indian frogs Nyctibatrachus humayuni has long attracted the attention of biologists because of its diversity:. researchers believe that these amphibians are most resourceful among all vertebrates
One of their original strategy -. Amplexus or psevdokopulyatsiya when the male fertilizes the eggs that the female lays. There are many ways to arrange the individual so that fertilization has occurred, and Indian frog used at least seven of them. The newly opened method is the male on the female in the time prior to egg laying. In contrast to previously observed variants, the male does not keep a female legs.
A feature of fertilization of amphibians of the order of tailless, which includes frogs and toads is Amplexus – position in which the male grabs the female front paws so that their cloaca are close by, and fertilize eggs outside in the process of laying or immediately after. Until now it was known six species Amplexus: inguinal, axillary, head covering, adhesive and independent position (individuals do not touch)
The researchers note that despite the apparent disadvantage of such equipment, the level of roe fertilization patients. masonry was 100 percent. At the same time 80 percent of nests were subsequently eaten by predators, mainly snakes.
N. humayuni was unusual by the fact that during the mating season rallying cry publish not only males but also females. This behavior has been known to only 25 of the more than 6600 species of tailless. No “spin landing” or enlistment cries of females in other species of the genus Nyctibatrachus are not observed. In addition, males Bombay nocturnal frogs were found to protect its territory from the competition, which also occurs rarely among tailless.
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