Sexual selection of male parental care in giant water bugs
... evolution of care behaviours. Paternal care may enhance male reproductive success through increased mating opportunities, when females are attracted to the direct benefit of increased offspring survival [9]. Females that prefer caring males may also derive indirect genetic benefits, if the caring ma ...
... evolution of care behaviours. Paternal care may enhance male reproductive success through increased mating opportunities, when females are attracted to the direct benefit of increased offspring survival [9]. Females that prefer caring males may also derive indirect genetic benefits, if the caring ma ...
Sexual selection
... In human social interactions, there is a general pattern for sexual selection in reproductive success – that is, an attractive or powerful individual will be more likely to be selected for than the average person in our short-term human evolution. Darwin was first to apply this notion of reproductiv ...
... In human social interactions, there is a general pattern for sexual selection in reproductive success – that is, an attractive or powerful individual will be more likely to be selected for than the average person in our short-term human evolution. Darwin was first to apply this notion of reproductiv ...
What is Play For? Sexual Selection and the Evolution of Play
... 10 play sessions per 100 observational periods and adult females fewer than 5. Adult females with an offspring did play more, exhibiting approximately 25 play sessions per observational period. Similar observations have been made of other playful species. Bekoff and Byers (1981, p. 297) indicate tha ...
... 10 play sessions per 100 observational periods and adult females fewer than 5. Adult females with an offspring did play more, exhibiting approximately 25 play sessions per observational period. Similar observations have been made of other playful species. Bekoff and Byers (1981, p. 297) indicate tha ...
Reversed sex roles and parental energy investment in zygotes of
... pipeflsh, Siphonostorna typhle and Nerophis ophidion, sexual dimorphism, dichromatism, and sex role reversal differed in degree between the species. N. ophidion females were larger than males, whereas in S. typhle sexes were equally large. Furthermore, N. ophidion females have pronounced sexual colo ...
... pipeflsh, Siphonostorna typhle and Nerophis ophidion, sexual dimorphism, dichromatism, and sex role reversal differed in degree between the species. N. ophidion females were larger than males, whereas in S. typhle sexes were equally large. Furthermore, N. ophidion females have pronounced sexual colo ...
The Descent of Sex: An Examination of Evolutionary
... These tendencies in boys are not only enforced by society but are shown to be a general tendency in mammalian species. This difference in enforced traits can have significant implications at the workplace (Browne, 1998). Status in society was shown to have reproductive payoffs for men (Browne, 1998 ...
... These tendencies in boys are not only enforced by society but are shown to be a general tendency in mammalian species. This difference in enforced traits can have significant implications at the workplace (Browne, 1998). Status in society was shown to have reproductive payoffs for men (Browne, 1998 ...
Theorizing Sexual Harassment: Comment on Uggen and Blackstone
... more likely than males to report sexual overtures as unwanted and harassing. The authors, of course, will disagree with this interpretation, but nothing in their data shows that it is any less compelling than their constructionist interpretation. They provide no data at all to demonstrate the superi ...
... more likely than males to report sexual overtures as unwanted and harassing. The authors, of course, will disagree with this interpretation, but nothing in their data shows that it is any less compelling than their constructionist interpretation. They provide no data at all to demonstrate the superi ...
biol2007 sex and sexual selection
... computer models suggest that an organism trained to recognize a particular shape may, after training, prefer an exaggerated version of that trait. For example, if a female recognizes her species by red colour, she may prefer a redder colour than present in the species, just because of the nature of ...
... computer models suggest that an organism trained to recognize a particular shape may, after training, prefer an exaggerated version of that trait. For example, if a female recognizes her species by red colour, she may prefer a redder colour than present in the species, just because of the nature of ...
Behavioral Ecology - College of Forestry, University of Guangxi
... • All behavior is a mix of genetic instructions and learning; but behaviors differ in the proportion with which they are genetically encoded. • Foraging theory is an example where researchers have tested whether animals make decisions that increase their energy intake and decrease how much energy th ...
... • All behavior is a mix of genetic instructions and learning; but behaviors differ in the proportion with which they are genetically encoded. • Foraging theory is an example where researchers have tested whether animals make decisions that increase their energy intake and decrease how much energy th ...
Mating: Sexual selection
... − intrasexual selection (male-male competition) in primates − males not only act to maximize their own matings with nearby females − the also also try to keep other males away from females − which increases the odds that when a female does get pregnant, he is the father − this involves hostile encou ...
... − intrasexual selection (male-male competition) in primates − males not only act to maximize their own matings with nearby females − the also also try to keep other males away from females − which increases the odds that when a female does get pregnant, he is the father − this involves hostile encou ...
Haplochromis burtoni – Burton`s Mouthbrooder
... territorial males. The preference shift is mediated by sex hormones that may influence perception - to enhance female visual acuity and ability to differentiate between dominant males (Martin 2004). Male courtship display consists of the male quivering in front of the female with the anal fin spread ...
... territorial males. The preference shift is mediated by sex hormones that may influence perception - to enhance female visual acuity and ability to differentiate between dominant males (Martin 2004). Male courtship display consists of the male quivering in front of the female with the anal fin spread ...
file.
... female survivorship and fecundity ensures a strong reason to accept or reject a mate, depending on his performance. However, some species only require males to provide sperm within the context of a relationship; they do not take up the “provider” role and this reasoning is not entirely applicable. I ...
... female survivorship and fecundity ensures a strong reason to accept or reject a mate, depending on his performance. However, some species only require males to provide sperm within the context of a relationship; they do not take up the “provider” role and this reasoning is not entirely applicable. I ...
Types of Sexual Selection
... Types of Sexual Selection Intrasexual selection – selection based on “___________-________ __________________” Intersexual selection – selection based on “__________________ _________________” Intra-sexual Selection – “Male-male Competition” ...
... Types of Sexual Selection Intrasexual selection – selection based on “___________-________ __________________” Intersexual selection – selection based on “__________________ _________________” Intra-sexual Selection – “Male-male Competition” ...
Coercive mating and gonopodium length in two populations
... females in this species (PLATH et al. 2004). The same is true for cave mollies, where females use non-visual cues to assess male size and prefer to associate with large males (PLATH et al. 2004). Small surface-dwelling P. mexicana males attempt to compensate this disadvantage by showing considerably ...
... females in this species (PLATH et al. 2004). The same is true for cave mollies, where females use non-visual cues to assess male size and prefer to associate with large males (PLATH et al. 2004). Small surface-dwelling P. mexicana males attempt to compensate this disadvantage by showing considerably ...
Turkey - Rolling Hills Zoo
... Gobblers have prominent caruncles, ‘globs’ of red flesh, along the base of their neck. ...
... Gobblers have prominent caruncles, ‘globs’ of red flesh, along the base of their neck. ...
3730L10 - U of L Class Index
... spanked for no reason, whereas females describe being spanked for not performing some task - This suggests that males focus on the intense sensation of pain itself, whereas females focus on pain as part of a relationship dynamic in ...
... spanked for no reason, whereas females describe being spanked for not performing some task - This suggests that males focus on the intense sensation of pain itself, whereas females focus on pain as part of a relationship dynamic in ...
Ecology and Evolution of the Enigmatic Eclectus Parrot
... each nest tree comprised parents with their grown offspring, and it was hypothesized that the parents used their ability to manipulate the sex of offspring to skew output toward males because they help at the nest. However, the finding that the additional males are all unrelated to the breeders and ...
... each nest tree comprised parents with their grown offspring, and it was hypothesized that the parents used their ability to manipulate the sex of offspring to skew output toward males because they help at the nest. However, the finding that the additional males are all unrelated to the breeders and ...
define-and-distinguish-clearly-between-natural
... In some species, males evolve rather extreme and potentially disadvantageous behavioural and physical traits in an attempt to out-compete other males of the same species. This is referred to as the handicap principle. These costly traits and ornaments are used to indicate vitality, and exceptional f ...
... In some species, males evolve rather extreme and potentially disadvantageous behavioural and physical traits in an attempt to out-compete other males of the same species. This is referred to as the handicap principle. These costly traits and ornaments are used to indicate vitality, and exceptional f ...
Spontaneous male death and monogyny in the dark fishing spider
... monogyny is likely to evolve in taxa with first-male sperm precedence [5]. While sperm precedence patterns are not known for many animal taxa, particular traits and behaviour are often coincident with first-male sperm precedence, for example, early male maturation and precopulatory mate guarding [22 ...
... monogyny is likely to evolve in taxa with first-male sperm precedence [5]. While sperm precedence patterns are not known for many animal taxa, particular traits and behaviour are often coincident with first-male sperm precedence, for example, early male maturation and precopulatory mate guarding [22 ...
Model Details - Virtual Biology Lab
... on Caribbean islands and in South America. They are sexually dimorphic, with males being smaller than females, with much larger tails and fins. In Trinidad they live in small pools associated with mountain streams, some of which have pike cichlid (which prey on guppies) and some do not. Endler found ...
... on Caribbean islands and in South America. They are sexually dimorphic, with males being smaller than females, with much larger tails and fins. In Trinidad they live in small pools associated with mountain streams, some of which have pike cichlid (which prey on guppies) and some do not. Endler found ...
File - Mr. Shanks` Class
... It is thought that the typically average is attractive because this suggests something which has adapted to its environment and is healthy. ...
... It is thought that the typically average is attractive because this suggests something which has adapted to its environment and is healthy. ...
Black-and-white Ruffed Lemur: Size: Head and body 51
... bright blue bony ridges on either side. This mimics a snarl and the brightness and size of these ridges indicates the male's age and condition. The whole is framed with bright orange chin and side-whiskers. His colours brighten when he is excited: becoming bluer on his rump and chest, and red dots m ...
... bright blue bony ridges on either side. This mimics a snarl and the brightness and size of these ridges indicates the male's age and condition. The whole is framed with bright orange chin and side-whiskers. His colours brighten when he is excited: becoming bluer on his rump and chest, and red dots m ...
Nephila clavipes (Golden Orb Weaver)
... than the females and once they reach maturity cannot produce webs capable of capturing prey. The males must then depend on females for survival by living in their webs and feeding off their prey. This allows the males to be present when the female achieves maturity to mate. They create webs that aid ...
... than the females and once they reach maturity cannot produce webs capable of capturing prey. The males must then depend on females for survival by living in their webs and feeding off their prey. This allows the males to be present when the female achieves maturity to mate. They create webs that aid ...
Are there sex differences in sexual satisfaction?
... 2. Research has shown that females exhibit greater intra-individual variation in sexuality across time than males. Females report more permissive sexual attitudes after dating experience. Males report no change in sexual attitudes after dating experience (Harrison et al., 1974; Reiss, 1967). Fe ...
... 2. Research has shown that females exhibit greater intra-individual variation in sexuality across time than males. Females report more permissive sexual attitudes after dating experience. Males report no change in sexual attitudes after dating experience (Harrison et al., 1974; Reiss, 1967). Fe ...
biol b242 sex and sexual selection
... potentially father many offspring Females: expensive gametes often show more parental care, at least as far as nutrients in the egg limited number of offspring than males ...
... potentially father many offspring Females: expensive gametes often show more parental care, at least as far as nutrients in the egg limited number of offspring than males ...
Dr. Tatiana`s Sex Advice
... copulating” (p.19) in order to prevent the further copulating of other males with this particular female. Yet, this does nothing for the male’s security. Often, when the male leaves a cork described above in the female’s reproductive track, she simply pulls it out! This way of interaction in nature ...
... copulating” (p.19) in order to prevent the further copulating of other males with this particular female. Yet, this does nothing for the male’s security. Often, when the male leaves a cork described above in the female’s reproductive track, she simply pulls it out! This way of interaction in nature ...