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MessagePosté le: Ven 18 Mai - 09:34 (2018)    Sujet du message: Shaquille O'Neal Jersey Répondre en citant

SAN FRANCISCO Jerian Grant Bulls Jersey , July 26 (Xinhua) -- A team of U.S. and Brazilian researchers suggests that mating on land in frog species might in part be a strategy that male frogs use to ensure that their own genetic imprint gets passed on, instead of that of their rivals.

Biologists have long thought that some frog species evolved to mate on land instead of in open water to better guard eggs and tadpoles from being eaten by fish and other predators. However, the new study, published online ahead of print this week in the American Naturalist, gives a new idea.

Frogs have a "dizzying array" of reproductive strategies, said Rayna Camille Bell, a University of California Denzel Valentine Bulls Jersey , Berkeley, postdoctoral fellow who contributed to data collection, analyzed and interpreted much of the data, and helped co-author the study, which was led by her doctoral thesis adviser, Kelly Zamudio, a professor at Cornell University.

Mating in frogs typically involves the male wrapping his arms around the female Dennis Rodman Bulls Jersey , the female depositing eggs and the male fertilizing the eggs, which will hatch into tadpoles and develop into froglets. The earliest frogs completed all of these steps in water, but frog species vary in where they mate, where they lay eggs, where tadpoles develop and whether and how eggs and tadpoles are tended to by parent frogs.

In reviewing datasets built upon the field work of other biologists and their own data on hundreds of species in two different families of tropical frogs, the Hylidae and Leptodactylidae, the researchers found that most of the diversity in reproductive strategies involves the egg stage. It indicates that selection is acting independently on eggs versus tadpoles Cameron Payne Bulls Jersey , Bell said, suggesting that there might be other evolutionary advantages of depositing eggs on land.

When mating occurs away from the main body of water, the site seems to be often more private and hidden from competing males.

"Besides avoiding aquatic predators, the benefit of depositing your eggs on land away from the main body of water - if you are a male frog - is that you get the female away from the breeding frenzy where there are hundreds of males all competing for access to females," Bell said. "On land, it's easier to make sure that no other male is moving in on your female and fertilizing her eggs."

"The tropics have the greatest frog species diversity, as well as the most diversity and complexity in frog reproductive modes Bobby Portis Bulls Jersey ," Bell was quoted as saying in a release from UC Berkeley on Tuesday.

"But we know the least about the biology, behavior and diversity of these tropical species, even though many are threatened, and some are only now being discovered for the first time."

DUSHANBE, Sept. 5 (Xinhua) -- An international extreme sports event will be held later this month at Karakul Lake located in Tajikistan's Pamir Mountains, authorities said Friday.

Adventure seekers and extreme sports enthusiasts have been invited to the "Roof of the World" regatta, which will begin on Sept. 13 and include kite-surfing Authentic Zach LaVine Jersey , sailing, rowing and kayaking craft, said the Committee for Youth, Sports and Tourism Affairs.

It is the first time for Tajikistan to host the three-day sports event.

Karakul Lake, or Black Lake, is located within the Tajik National Park, one of the most beautiful and remote locations in Central Asia.

It is a deep brackish-water lake situated in a closed basin at an altitude of 3 Authentic Tony Kukoc Jersey ,900 meters above sea level. Surrounded by high mountains, which block humid air masses, the valley receives less than 30 mm of precipitation a year, making it one of the driest places in the region.
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