Sexual education is a social responsibility and is a part of the coherent strategy referred to the introduction in schools in Angola. It was made of a prospective, descriptive and longitudinal study that has been char...Sexual education is a social responsibility and is a part of the coherent strategy referred to the introduction in schools in Angola. It was made of a prospective, descriptive and longitudinal study that has been characterized the knowledge of sexual education of students in general education in three schools and the Council of Christian Churches in Huambo-Angola in July 2015. The sample consisted of 386 students chosen randomly;there are no sexual education programs in the education system, there are taboos on sexuality, the respondents do not know the sexual organs and much less contraceptive methods, there are still taboos in sexuality theme approach with adolescents, the results showed.展开更多
We describe the natural history and reproductive behaviour of the Emei Moustache Toad(Leptobrachium boringii) with an emphasis on the development of keratinized nuptial spines in males and document combat behaviour fo...We describe the natural history and reproductive behaviour of the Emei Moustache Toad(Leptobrachium boringii) with an emphasis on the development of keratinized nuptial spines in males and document combat behaviour for the first time in this species. Between February and March of 2011, 19 female and 43 male L. boringii from Mount Emei UNESCO World Heritage Site, Sichuan, China were observed throughout the breeding season. This species exhibits male-biased sexual size dimorphism(SSD) with limited evidence of paternal care(nest guarding by males). Prior to the breeding season males grow 10 – 16 keratinized spines on their upper lip, which fall off once the season has ended. Throughout the breeding season males construct and defend aquatic nests where they produce advertisement calls to attract females. During this time we documented 14 cases involving a total of 22 males where males used their moustaches for aggressive interaction. Combat typically occurred at the beginning of the season when males would compete for a limited number of available nest sites. Neither male body size, nor body condition significantly affects the outcome of an aggressive interaction, suggesting that size may not be the only factor influencing an individual’s chance of victory. Our evidence for male competition and aggression, along with observed paternal care are potential mechanisms to explain the evolution of male-biased SSD observed in this species.展开更多
文摘Sexual education is a social responsibility and is a part of the coherent strategy referred to the introduction in schools in Angola. It was made of a prospective, descriptive and longitudinal study that has been characterized the knowledge of sexual education of students in general education in three schools and the Council of Christian Churches in Huambo-Angola in July 2015. The sample consisted of 386 students chosen randomly;there are no sexual education programs in the education system, there are taboos on sexuality, the respondents do not know the sexual organs and much less contraceptive methods, there are still taboos in sexuality theme approach with adolescents, the results showed.
文摘We describe the natural history and reproductive behaviour of the Emei Moustache Toad(Leptobrachium boringii) with an emphasis on the development of keratinized nuptial spines in males and document combat behaviour for the first time in this species. Between February and March of 2011, 19 female and 43 male L. boringii from Mount Emei UNESCO World Heritage Site, Sichuan, China were observed throughout the breeding season. This species exhibits male-biased sexual size dimorphism(SSD) with limited evidence of paternal care(nest guarding by males). Prior to the breeding season males grow 10 – 16 keratinized spines on their upper lip, which fall off once the season has ended. Throughout the breeding season males construct and defend aquatic nests where they produce advertisement calls to attract females. During this time we documented 14 cases involving a total of 22 males where males used their moustaches for aggressive interaction. Combat typically occurred at the beginning of the season when males would compete for a limited number of available nest sites. Neither male body size, nor body condition significantly affects the outcome of an aggressive interaction, suggesting that size may not be the only factor influencing an individual’s chance of victory. Our evidence for male competition and aggression, along with observed paternal care are potential mechanisms to explain the evolution of male-biased SSD observed in this species.
