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Female Fish judge Males based on their ability to Design Nests: Study

Female choices flipped from preferring tighter nests under high oxygen conditions, to preferring looser nests when conditions deteriorated

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London, November 6, 2016: Female fish judge males based on their ability to design nests best suited for the conditions of their environment, suggests a study.

According to the study, male fish build nests to suit local environments — and females judge males on their ability to respond to changing conditions.

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In the study, which is published in the journal Evolution, the researchers showed that low oxygen can change the way in which fish build nests and also change the nesting preferences of female fish.

Male three-spined stickleback fish are unusual in that they build nests and provide all the parental care for the eggs, which are spawned by females, and for the developing baby fish.

The research team found that males change the design of their nests depending on the oxygen content of the water — making looser nests under low-oxygen conditions and more compact nests when oxygen increases.

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“Male sticklebacks have to work really hard as dads, using their fins to fan water through the nest to supply the eggs with the oxygen they need to develop,” said Iain Barber, Researcher at the University of Leicester.

“If the water is low in oxygen, then having a looser, more open nest allows more oxygen to reach the eggs, but it probably comes at the expense of increasing the risk of them being discovered by predators,” Barber added.

Low oxygen can also critically affect important reproductive behaviours, with associated effects on the viability of fish populations and even implications for natural selection and evolution.

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The research has shown that it was not just male construction that was affected when water oxygen levels changed. The most interesting finding was that female fish also changed their preferences for the design of nest they went for.

Female choices flipped from preferring tighter nests under high oxygen conditions, to preferring looser nests when conditions deteriorated. (IANS)

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  • Ruchika Kumari

    Such an interesting research

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Climate Change Not A Hoax: Trump

President Trump signed a declaration Sunday saying the federal government will, for now, pay for 100 percent of the cleanup in Florida

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Climate Change
President Donald Trump speaks during a meeting in the Oval Office of the White House in Washington. VOA

U.S. President Donald Trump is backing off his claim that climate change is a hoax.

In an interview broadcast Sunday, Trump told CBS-TV’s 60 Minutes “I think something’s happening. Something’s changing and it’ll change back again…I’m not denying climate change, but it could very well go back. You know, we’re talking about over millions of years.”

Trump has over the years called global warming a hoax and had once called it a Chinese plot aimed at wrecking the U.S. economy.

climate change
People clean up their house that was destro. yed by Hurricane Michael in Mexico Beach. VOA

Trump told 60 Minutes he does not know if global waning is manmade, despite the scientific research showing that pollution and human activity is the major contributor. He said he does not want to give “trillions and trillions of dollars” and lose “millions and millions of jobs” to prevent it.

Most scientists link a warming planet with storms that are more intense. Hurricane Michael slammed into the Florida Panhandle last week as the strongest storm to strike the continental United States in nearly 50 years.

Trump said there have been hurricanes that were “far worse” than Michael and said scientists calling for action on climate change have a “very big political agenda.”

Meanwhile, the town of Mexico Beach, Florida was just about wiped off the face of the earth by Hurricane Michael.

“Mexico Beach is devastated,” Florida Governor Rick Scott says. “It’s like a war zone.”

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Scenes of devastation in Mexico Beach, Florida in the aftermath for Hurricane Michael. VOA

Michael’s 250 kilometer per hour winds left only a handful of buildings standing. Concrete slabs are left where houses and stores thrived. Only a few trees are left. The main U.S. highway that goes through the town is not drivable.

Mexico Beach police chief Anthony Kelly told VOA’s Spanish Service, “When you come here and see the devastation, it’s hard, it’s emotionally hard.”

“We know each person in the majority of the houses. They know us,” Kelly said. “All these people are close to us. And now we’re going around the neighborhoods making sure that they’re not in any of these houses that are so extremely damaged.”

“Looking in the debris, seeing photos of grandkids, people that we know that have come back here year after year, that’s the emotional side,” he said. “I’ve got officers that this is their first catastrophic event, and it’s hard to explain to them, you know, it’s going to get better, because they’re seeing reality.”

The town’s medical manager, Patricia Cantwell, said, “It’s extremely sad that the devastation has been so rampant throughout the Panhandle” of the state.

“Having lived through Hurricane Andrew in south Florida (in 1992), it’s going to take a while,” she told VOA. “It’s one day at a time. It looks overwhelming to start, but, you know, one day at a time. It’s going to take years to get things back up and running.”

Climate Change
Scenes of devastation in Mexico Beach, Florida in the aftermath for Hurricane Michael.. VOA

Brock Long, the head Federal Emergency Management Agency, said the death toll in Mexico Beach could rise, as rescue workers continue to search the rubble left behind by the storm. It could take another 10 days to compile a damage estimate.

Some physical structures in the town were lifted off their moorings and moved hundreds of meters away by the winds and storm surge from the storm. Other buildings were left in masses of debris, demolished beyond recognition.

Also Read: US First Lady Melania Trump Starts The Final Leg of Her Africa Trip

President Trump signed a declaration Sunday saying the federal government will, for now, pay for 100 percent of the cleanup in Florida, temporarily easing the financial burden from the state. (VOA)