Lizard species found to reduce head bobbing mating ritual when predators are

first_img Explore further (Phys.org) —A team made up of researchers from several universities in the U.S. has found that male brown anoles (Anolis sagrei)—a type of lizard, dramatically reduced its head bobbing mating dance when predators were introduced. In their paper published in Proceedings of the National Academy of Sciences, the researchers describe their field study of the lizards and how it resulted in the discovery that an animal was able to change its mating behavior so quickly. Study shows male bowerbirds manipulate female color perception Male brown anoles, like many other lizards (and other species) engage in a dance of sorts when attempting to attract a mate. It bobs its head in exaggerated movements, puffs up its bright orange dewlap and even does some pushups. In addition to attracting a mate, the dance is believed to also serve as a warning to rivals to stay away. In this new effort, the researchers found that if predators came into the area, the males immediately toned down their moves, hoping apparently, to remain unseen, while attempting to entice a mate.To find out more about the lizard’s mating patterns the team of researchers ventured down to its home in the Bahamas and set about measuring the amount of movement involved in head bobbing with several specimens on several of the islands. Once that was completed, they introduced carnivorous curly-tailed lizards, (Leiocephalus carinatus) onto the islands, which are known to catch and eat brown anoles. After waiting for a period of time to allow the new arrangements to settle, the researchers once again measured the distance the heads of several specimens traveled as they engaged in their head bobbing dance, and found that the distance had decreased dramatically (up to 40 percent). They also noted that the lizards appeared to be more timid as they bobbed, doing so with far less enthusiasm.The researchers surmise that the reduction in head bobbing was due to a desire to be less noticeable to the newly arrived predators that may be in the area. How the females responded to the feeble mating gestures has yet to be determined, though it’s likely they too would prefer to not attract the attention of predators when mating as well.The researchers note that many cases of animals changing their mating rituals have been observed over the course of several generations in response to predators, but a single species changing its mating habits in its own lifetime has not been seen before. Journal information: Proceedings of the National Academy of Sciences More information: Predation-associated modulation of movement-based signals by a Bahamian lizard, David S. Steinberg, PNAS, DOI: 10.1073/pnas.1407190111AbstractSignaling individuals must effectively capture and hold the attention of intended conspecific receivers while limiting eavesdropping by potential predators. A possible mechanism for achieving this balance is for individuals to modulate the physical properties of their signals or to alter the proportion of time spent signaling, depending upon local levels of predation pressure. We test the hypothesis that prey can alter their visual signaling behavior to decrease conspicuousness and potentially limit predation risk via modulation of signal properties or display rate. To do so, we conducted a manipulative experiment in nature to evaluate the possible effect of predation pressure on the physical properties of movement-based signals and on the proportion of time spent signaling by using a well-understood predator–prey system in the Bahamas, the semiarboreal lizard Anolis sagrei, and one of its main predators, the curly-tailed lizard Leiocephalus carinatus. We find that on islands onto which the predator was introduced, male anoles reduce the maximum amplitude of head-bob displays but not the proportion of time spent signaling, in comparison with control islands lacking the predator. This reduction of amplitude also decreases signal active space, which might alter the reproductive success of signaling individuals. We suggest that future studies of predator–prey interactions consider the risk effects generated by changes in signals or signaling behavior to fully determine the influence of predation pressure on the dynamics of prey populations.center_img Citation: Lizard species found to reduce head bobbing mating ritual when predators are around (2014, May 20) retrieved 18 August 2019 from https://phys.org/news/2014-05-lizard-species-bobbing-ritual-predators.html © 2014 Phys.org Male anolis sagrei expanding its throat. Credit: Frédéric Trudeau/Wikipedia. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

Playing just the right keys

first_imgDelhi brings Un Argentin A Paris by Christine Chareyron –Pianist, a musical night and melodious experience for all the piano lovers on Wednesday on 4 September at Alliance Francaise de Delhi. Christiane Chareyon is an established pianist and a piano teacher at the Music School of Suresnes. After studying at the national Music College of Grenoble followed by the higher National Music School of Paris, she also practiced under the supervision of Jean Fassina. She has also has a passion toward s Dramatic Arts,which she studied at National Music school at Chambery and then at the National Music College of Grenoble. Also Read – ‘Playing Jojo was emotionally exhausting’She will be playing pieces from repertoire of Astor Piazzolla an Argentinan composer. Regarding Piazzolla, Christine Chareyon says herself that playing her pieces brings each time something new nothing is ever fixed and settled .It is mostly a unique and sharing experience.She induces another type off rhythm in her concerts with brief talks based on texts directly linked with the pieces played. Her intention is to carry the audience in an experience that is wider and wider.last_img read more

North East comes calling

first_imgThe event held an interactive session based on the North East Fest and several discussions were conducted regarding how the fest is playing a vital role in enhancing the North East market. A fashion show was organised during the event where Soha Ali Khan, actor and brand ambassador of the NEF walked the ramp accompanied by other models.Explaining the importance of the event, director of Home Affairs North East division, Ajay Kanaujia said, ‘NEF is an important step in bringing the North East closer to the rest of the country. With the Delhi chapter the event is sure to bring national focus to the splendor that this region contains across industries be it fashion ,music, food, culture or tourism. We look forward to open a platform to provide various opportunities for the people of the region.’ Also Read – ‘Playing Jojo was emotionally exhausting’Speaking about the upcoming fest Soha said, ‘The NEF in its second edition will prove to be even more bigger and better occasion for the promotion of talent, craft, skill, food and beauty in the North East. I am personally a big fan of everything from this area, the food, the warm and friendly people,the musical tradition, the fashion, the intricate and their weaving skills. I look forward to the NEF as it will allows everyone to get acquainted with the delights this region has to offer.’ Also Read – Leslie doing new comedy special with NetflixDeka, a fashion designer from Guwahati said, ‘North East and its people have always been known for fashion in the entire nation. The design in its area is a perfect blend of global style and traditional allure. The NEF will bring the immense wealth in design and fashion to the fore at the mainstream level. The workshop and one-on-one interaction with design will offer an opportunity for exchange and learning for both the designers and the aspiring members of the fashion.’The dignitaries who were present during the event were Chairman and MD of National Textile Corporation, RK Sinha, Director Technical, RK Sharma and Joi Barua, famous Singer of North East.last_img read more

Watercolour and controlled strokes

first_imgAkbar padamsee, Jai Zharotia, Sudip Roy, R.K. Saini, Anubhav Som, all these artists from different stages in their career have one thing in common; the confidence of working with watercolour. The Challenge: Watercolour as a Medium is an exhibition of artworks by Indian artists spanning several generations who used watercolour as a medium. The exhibition is being organised by Gallery and is open since the 12 October.Watercolours can be called ‘Quick visual notes’ or ‘Visual Diaries’ as life is captured on paper with urgency yet in controlled strokes. It’s a percolation of ideas and experiences using pigment, water and light to create artworks which have luminosity and confidence. The amount of controlled fluidity demanded from this medium is unlike other mediums of painting.  Also Read – ‘Playing Jojo was emotionally exhausting’The show has works by senior artists like Akbar padamsee, Jai Zharotia, Sakti Burman, Ganesh Haloi, Laxma Goud; senior Contemporary artists namely Sudip Roy, R.K. Saini, Bikash Poddar and  also younger contemporary artist like Anubhav Som, Ramesh Jhawar and Karan Thapa. These artists have the attributes of fluidity, immediacy and intuition evident in their artworks and have understood and overcame the challenges of watercolour as a medium.When: On till 11 November (Monday to Saturday) Where: Five Art Gallery Consultants, Lado Sarailast_img read more

Oscar for Unbroken would be great

first_imgUnbroken is about the life of World War II hero Louis ‘Louie’ Zamperini, a former American Olympic track star who survives a plane crash in the Pacific, and after being discovered floating on a raft after 47 days, is made a prisoner of war by Japan and spends two-and-half years being tortured whilst incarcerated.The Hollywood star has said that it meant a lot to her to be able to bring Zamperini’s story to the big screen and therefore she would cherish any Oscar win even more than her first Academy Award 14 years ago for ‘Girl, Interrupted’, reports femalefirst.co.uk.Speaking at the British premiere of the film here, she said: ‘I love directing and most of all I felt very responsible to this story and this man’s life.’ When asked what Oscar success would mean, she replied: ‘It would mean a great deal to me, for sure.’ The much anticipated film is set to release Dec 25.last_img read more

Sexist video games hamper empathy in men for women

first_imgYoung male gamers who strongly identify with male characters in sexist and violent video games show less empathy towards female violence victims in real life, say researchers.They found that males who played ‘Half Life 1’ or ‘Half Life 2’ games — violent games sans sexist component — did not show the same lack of empathy as those who played the ‘Grand Theft Auto’ (GTA) games that combined sexism and violence.“Males who really identified with their characters in the sexist, violent games didn’t feel as much empathy for the victim,” said Brad Bushman from The Ohio State University in Columbus. In a video game, you are physically linked to the character. “You control what he does. That can have a real effect on your thoughts, feelings and behaviour, at least in the short term,” Bushman added in the paper published in the journal PLOS ONE.The team analysed 154 high school students, aged 15-20 years. Also Read – ‘Playing Jojo was emotionally exhausting’Some of the participants played GTA games that contained both violence and sexism. Bushman noted that in these games, women are secondary characters who are used as sexual objects by players.The second group played ‘Half Life 1’ or ‘Half Life 2’ which are violent but do not portray women in a sexual or sexist manner. In fact, the female character in the ‘Half Life’ games plays an active role. The third group played games which have neither violence nor sexism. Also Read – Leslie doing new comedy special with Netflix“Most people would look at these images and say the girl pictured has to be terrified,” Bushman noted. The findings showed that after playing a violent, sexist game, male players reported lower levels of sympathy and compassion compared to those who played games without a sexist component.These males were likely to agree with what are called “masculine beliefs.” The study also identified which players are most likely to be affected by sexist and violent games and how exactly the games have their impact.“This finding gives us a better idea of what exactly a combination of violence and sexism in video games does to harm male players,” noted lead study author Alessandro Gabbiadini from the University of Milano Bicocca in Italy.last_img read more

Fatherinlaw husband arrested after womans death

first_imgKOLKATA: Two persons were beaten up by the locals of Sahagunj in Chinsurah over a housewife’s death. Later, both of the attacked persons were detained by the police and three persons have been arrested.Sources informed that Madhumita Bhattacharya of Kanakshali area got married to Tamal Chatterjee around seven years ago. Meanwhile, Bhattacharya’s relatives alleged that Chatterjee used to torture Bhattacharya regularly. Her parents passed away within a few years of her marriage. Since then she had been facing torture. It was alleged that Chatterjee and his family members forced her to transfer properties worth crores of rupees that she inherited from her parents. Also Read – Rain batters Kolkata, cripples normal lifeRecently, Bhattacharya moved to her paternal house as she was depressed and her heart tore into pieces when she came to know that Chatterjee was getting married again. On Tuesday while going somewhere in a toto, she met with an accident and was admitted to a hospital in Chinsurah, where she died on Thursday morning. As the news of her death reached Kanakshali, the locals got furious. When Chatterjee and his father went there, they started bashing the duo. Police later recovered and took them to the police station. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedIn another incident, a housewife has been murdered by her husband at Nodakhali in South 24-Parganas. Locals informed that Shaikh Sadek and Tanuja Bibi used to live there for several years. For a long time, Sadek remained jobless and the family faced endless financial problems. At one night, a massive altercation broke out between Sadek and Bibi over financial issues. Some neighbours alleged that Sadek was an alcoholic. To make ends meet, Bibi had taken up work as a domestic help at several places. But that did not work as Sadek used to take away her money to buy alcohol. On Thursday morning, when Sadek was refused money, he started threatening his wife. All of a sudden, he hit Bibi with a mortar and pestle and fled the scene. Her neighbours rushed Bibi to a hospital where she was declared brought dead. Later, a complaint against Sadek was lodged and a murder case initiated. Police are searching for Sadek, who is still at large.last_img read more

Many artists one showcase

first_imgExploring the delicate threads of affinity between creativity and its versatile approach towards the realistic world in diverse emotions, ‘Collectively Independent’, an exhibition curated by Inner Konnect Art (IKA), showcases the constructive styles by different artists through different mediums. One can witness and embrace some amazing artistic pieces at the Visual Art Gallery of the Indian habitat Centre between September 1 and 17. ‘Collectively Independent’ is an exciting look at some of the genius talents. For example, there is a recognisable ‘movement’ in Ruchi Chadha’s works. Ruchi, a well known artist, shows reflections in moving water, depicting what one wishes to reflect in their lives, while Gaurav, with a great sense of colours, creates rich tones on canvas which depict passion and romance. Often characterized by a sense of enigma, his works of art using non-objective forms and figurative alliances, engages the viewer by inviting them to be a part of the canvas. Also Read – Add new books to your shelfGeetika Sangwan’s artwork on the other hand is an amalgamation of contemporary, abstract and semi-realistic forms which she feels is the continuation of her journey of exploring the relation between human and nature. Other artists who shall be participating in the event, to showcase some jaw-dropping art pieces, includes Smita Jain, Ashish Bose, Amit Shrivistav and many more. The youngest of the lot is a 13-year-old, Mishika Chawla, whose choice of colours always had a vivid balance. Influenced mainly by nature, she loves to paint what catches her eye, from breathtaking landscapes to figurative works.The exhibition is an attempt to incorporate different independent artists with different ideas, style of work, perspectives and different viewpoints. The art pieces will be showcased between 11 am to 8 pm.last_img read more

N Bengal team grabs top slot in platoon shooting competition

first_imgDarjeeling: Platoon weapon shooting team of North Bengal Frontier, BSF have shot their way to victory by winning the covetedPlatoon Weapon Trophy and achieving the overall first position in the 49th BSF Inter Frontier Platoon Shooting Competition. The competition was held in Indore, Madhya Pradesh from February 13 to 18th. The North Bengal Frontier bagged 10 golds, 17 silvers and 4 bronze medals in different events. Inspector General, North Bengal Frontier gave away special awards to the team members on Monday to boost the morale of these shooters.last_img

Stay healthy with dried fruits health bars

first_imgAs healthy living has become a catchword these days, people have taken to eating dried fruits and health bars. Experts say these can give natural nutrients. Here’s how dry fruits and nuts used in health snack bars help the cause of healthy living: Dried fruits generally contain more fiber than the same-sized serving of their fresh counterparts. Fiber helps in keeping your digestive system running smoothly. The various dry fruits are packed naturally with a mix of nutritional elements like potassium, calcium, magnesium, zinc, iron, carotenoids, antioxidants, vitamins, dietary fiber, flavonoids, selenium and more apart from the good quality fat and protein that these provide. Also Read – Add new books to your shelfThese help in various ways like increase of good cholesterol, reduction in bad cholesterol, maintaining blood pressure , blood sugar control, thyroid control, improving heart function, bowel movement, skin health, hair control, cancer fighting properties, improving bone health, improved vision, easing digestion and fighting anaemia to name a few. Many of the dry fruits are low in glycemic index, and so, they help slow release of energy and control blood sugar. Also Read – Over 2 hours screen time daily will make your kids impulsiveBecause most of the water is extracted from fruits, their nutrients are condensed into a small package. Dried fruits like apricots, raisins, prunes and figs contain high amounts of beta carotene, vitamin E, niacin, iron, magnesium, potassium and calcium. Dried fruits contain little to no fat. They also contain significant calories per serving, making them a natural source of energy for athletes. They are also a good supplement for people seeking to gain weight in a healthy way.last_img read more