Bidder's organ develops promptly into a functional ovary (O), and during the same time there is a great swelling of the oviduct. A previously male animal, even one which has already fathered children, thereby becomes capable of assuming a female role. This is possible because, along with ...
Male and female common toad in small forest pond during spring time in Switzerland,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里巴巴、京东、亚马逊、小米、联想、奥美、盛世长城、
since dog names to make them more appropriate should match the personality and appearance of the dogs, but do not worry here we will give you tips to make the task easier and effective as possible, the first is the gender classification, do we need male dog names or female dog names ?,...
A major controversy of sexual selection theory is whether sexually dimorphic characters used in display by males have arisen through male–male competition, female choice, or both 1–4 . Here I describe the chorusing behaviour of male natterjack toads ( Bufo calamita ) and show that the pitch ...
Toad Test (redirected fromMale Frog Test) A bioassay of historical interest that used the South African clawed toad, Xenopis laevis, to detect increased production of hCG by injecting plasma from pregnant human females, which induces sperm release in toads ...
If learning is experimentally controlled, then the direction and strength of sexual selection could be under-estimated or misinterpreted. Sexual experience can potentially affect male mating and reproductive success by altering male behavior, female preferences, or both. First, sexual experience may ...
The reproductive behavior of the male Japanese toad, Bufo japonicus japonicus, was observed at several ponds in Kanazawa prefecture, central Japan. In the two ponds where males outnumbered females by six to one, 88% of the male toads stayed on the land around the pond, waiting and searching ...
In the present study, when given a simultaneous choice between a male and a female of identical size, males did not discriminate between the sexes, and attempted to clasp a male or a female with equal frequency. Test males only released the stimulus toad when a release call was emitted by...
In this context, a 'compatible genes' model has been put forward to explain female mating decisions. According to this model, females are assumed to increase the genetic quality of their offspring by choosing mates on the basis of interactions between maternal and paternal genomes. Yet, this ...
Although detached and unattached males were equally likely to attach while in the pools if given enough time, unattached males took longer to attach and were more likely to let go of the female during the release process than the detached males. These results suggest that attached and unattached...