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Lees! Het boekenfestival: daar zijn we ook graag bij. U vindt ons aan de stand van Baeckens & Averbode. Elke namiddag bieden we kakelende (ha)animatie haan: ballonhoeden, gekke kapsels en glittertattoos. Welkom! #boekenfestival #boekenbeurs #averbode #uitgeverijaverbode #leeshetboekenfestival #lees #baeckensbooks #baeckens #antwerpexpo #gekkekapsels #kipvantroje https://www.instagram.com/p/CVugdvrNk-Y/?utm_medium=tumblr
#boekenfestival#boekenbeurs#averbode#uitgeverijaverbode#leeshetboekenfestival#lees#baeckensbooks#baeckens#antwerpexpo#gekkekapsels#kipvantroje
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[Where to do number two: Lizards prefer to defecate on the largest rock in the territory]
Baeckens et al. (2019)
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Nieuwe Film Merchandise op https://filmflits.nl/de-buurtpolitie-het-circus/
De Buurtpolitie Het Circus
FILMFLITS SCORE: 0.
EAN: 5407006501060
INFO: DVD | Nederlands
PRIJS: €22,99
De Buurtpolitie Het Circus Gegevens
Label: EIC, Baeckens Books
De Buurtpolitie Het Circus Cast & Crew
Acteur(s): Ianthe Tavernier, Charlotte De Groof, Manoe Frateur
De Buurtpolitie Het Circus Kijkwijzer
Advies: Geen angst, Geen discriminatie, Geen drugs en/of alcoholmisbruik, Grof taalgebruik, Geen geweld, Geen seks
Adviesleeftijd: Vanaf alle leeftijden
De Buurtpolitie Het Circus Specificaties
Drager: DVD
Aantal stuks in verpakking: 1 disc
Speelduur: 82 min minuten
Regiocode: 2
Taal: Nederlands
Overige talen: Geen overige talen DVD
Ondertiteling: Nederlands
Beeldkleur: Color
Beeldformaat: 16:9
Audio: Dolby digital 5.1
Extra’s: Making of van de film – Première
De Buurtpolitie Het Circus Cijfers en feiten
Productiejaar: 2019
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Lizards change ‘cologne’ to communicate in new places
Lizards rapidly and repeatedly developed new chemical signals for communicating with each other after moving in small groups to experimental islands, researchers report.
Free from the risk of predators and intent to attract potential mates, male lizards produce a novel chemical calling card, the new research shows.
“…there is important variation in chemical signals depending on your context: Who’s trying to eat you, who wants to mate with you, and who you’re trying to compete with.”
Studies of animal signal evolution usually focus on acoustic and visual signals—like the complex warbling in a bird’s song or the bright flashes of color on fish scales. Chemical signals between animals are less obvious to humans and more technically complex to parse.
Much of the existing research on these signals has focused on insect pheromones relevant to certain agricultural applications.
But chemical signals are the oldest and most widespread communication mode, spanning bacteria to beavers. As such, they represent a valuable opportunity for decoding how animals communicate and perceive the world around them, researchers say.
“What we’ve discovered is that within species there is important variation in chemical signals depending on your context: Who’s trying to eat you, who wants to mate with you, and who you’re trying to compete with,” says Colin Donihue, a postdoctoral fellow in biology at Washington University in St. Louis and lead author of the new study in the Journal of Animal Ecology.
Lizards and their chemical signals
Both lizards and snakes collect chemical cues from their surroundings by flicking out their slender forked tongues, then process those cues using a well-developed sensory organ in the roof of their mouths.
Lizards deposit their chemical messages encoded in secretions from specialized glands located on their inner thighs. The secretions are a waxy cocktail of lipid compounds that contains detailed information about the individual lizard that produced them.
In this study, researchers relocated groups of eight male and 12 female Aegean wall lizards (Podarcis erhardii) from a single source population in Naxos, Greece, to five small islets that lacked predators. Under normal conditions, these lizards would have to contend with a number of native and non-native predators—including snakes, birds, and cats.
Free from predators on the small islets, the lizard populations grew rapidly and competition for resources was fierce.
Each of the relocated lizards was individually tagged so they could be identified when the researchers returned to check up on them. Over the next four years, the scientists revisited the populations, tracking the fates of the relocated lizards and their offspring.
What they found was striking: On each of the predator-free islands, lizards rapidly and repeatedly developed a new chemical “mix” that was distinct from that of lizards in the source population. The changes were apparent after only four generations.
‘A complex chemical communication library’
For the first time, researchers believe that they have demonstrated solid evidence that lizards can “put on a new cologne” to suit their setting.
“Signals to attract mates are often conspicuous to predators,” says coauthor Simon Baeckens, a postdoctoral fellow at the University of Antwerp in Belgium. “As such, sexual signals present a compromise between attractiveness and avoidance of detection. However, on these islets, there is no constraint on the evolution of highly conspicuous and attractive signals.
“In the experimental islands, we found that the ‘signal richness’ of the lizard secretions is the highest—meaning that the number of different compounds that we could detect in the secretion is the highest,” Baeckens adds. “Our previous research suggests that this more elaborate signal might advertise the high quality of a male.”
“Animals have spent over a billion years developing a complex chemical communication library,” Donihue continues. “But we only invented the technology to identify many of those chemicals a century ago, and the experiments for understanding what those chemicals mean for the animals in nature have only just begun.
“We found that animal chemical cues can rapidly and flexibly change to suit new settings, but this is only the beginning for understanding what the lizards are saying to each other.”
Source: Washington University in St. Louis
The post Lizards change ‘cologne’ to communicate in new places appeared first on Futurity.
Lizards change ‘cologne’ to communicate in new places published first on https://triviaqaweb.weebly.com/
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Lizards Prefer to Poop on the Largest Rock They Can Find
Conspicuous toilet spots may help Dalmatian wall lizards communicate.
“ after years of collecting lizards from the wild, it was clear to him that his research subjects did not choose their toilets randomly.[...]
Baeckens suspected that lizards might be deliberately leaving their "signals" in places where other lizards could easily see and smell them. But it's also possible that lizards like big rocks for other reasons, and their waste placement is a side effect of where they spend their time. For example, big rocks might provide the warmest sunning spots or the best view to watch for predators.”
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De Buurtpolitie Het Circus
Nieuwe Film Merchandise op https://filmflits.nl/de-buurtpolitie-het-circus/
De Buurtpolitie Het Circus
FILMFLITS SCORE: 0.
EAN: 5407006501060
INFO: DVD | Nederlands
PRIJS: €22,99
De Buurtpolitie Het Circus Gegevens
Label: EIC, Baeckens Books
De Buurtpolitie Het Circus Cast & Crew
Acteur(s): Ianthe Tavernier, Charlotte De Groof, Manoe Frateur
De Buurtpolitie Het Circus Kijkwijzer
Advies: Geen angst, Geen discriminatie, Geen drugs en/of alcoholmisbruik, Grof taalgebruik, Geen geweld, Geen seks
Adviesleeftijd: Vanaf alle leeftijden
De Buurtpolitie Het Circus Specificaties
Drager: DVD
Aantal stuks in verpakking: 1 disc
Speelduur: 82 min minuten
Regiocode: 2
Taal: Nederlands
Overige talen: Geen overige talen DVD
Ondertiteling: Nederlands
Beeldkleur: Color
Beeldformaat: 16:9
Audio: Dolby digital 5.1
Extra’s: Making of van de film – Première
De Buurtpolitie Het Circus Cijfers en feiten
Productiejaar: 2019
0 notes