中山经常便血什么原因(中山擦屁股纸上有血点) (今日更新中)

In regions of the United States and Mexico that are prone to hurricanes, aggressive spiders are evolving to survive and ride out the storm.When hurricanes rage along the Gulf of Mexico or charge up the East Coast, they can reshape an entire habitat in a short time. The winds destroy trees and spread debris for miles, putting new pressure on the creatures living in these environments.But how do creatures adapt when their habitats are so disturbed? Researchers looked at Anelosimus studiosus spiders that live in storm-prone areas along the coast to see how they changed. Their study was published Monday in the journal Nature Ecology and Evolution.These weather systems are called "black swan events": a surprising event with a major impact that is explained with the benefit of hindsight. They don't offer much lead time, so the researchers had to scramble to study the spider colonies before and after projected storms.The team monitored Subtropical Storm Alberto and Hurricanes Florence and Michael during the 2018 hurricane season. They tried to anticipate the systems' trajectories and study areas that included 240 female spider colonies, comparing them with areas where spider colonies were unaffected by such storms.The researchers returned to the sites hit by the storms 48 hours later. About 75% of the colonies survived the initial storm strikes."It is tremendously important to understand the environmental impacts of these 'black swan' weather events on evolution and natural selection," said Jonathan Pruitt, lead study author, evolutionary biologist and Canada 150 Chair in McMaster University's Department of Psychology, Neuroscience & Behaviour. "As sea levels rise, the incidence of tropical storms will only increase. Now more than ever we need to contend with what the ecological and evolutionary impacts of these storms will be for non-human animals."The A. studiosis spider species has two main personality traits that are inherited: docile and aggressive.Aggressiveness can be determined based on their speed, attackers pursuing prey, cannibalizing male spiders as well as eggs and their vulnerability to the invasion of predatory spiders.On the one hand, aggressive colonies are better at gathering resources in times of scarcity. But when deprived of food or subjected to overheating, aggressive colonies can also suffer from infighting."Tropical cyclones likely impact both of these stressors by altering the numbers of flying prey and increasing sun exposure from a more open canopy layer," Pruitt said. "Aggressiveness is passed down through generations in these colonies, from parent to daughter, and is a major factor in their survival and ability to reproduce."The researchers determined that after a storm passed, the colonies that aggressively pursued food and resources were able to produce more egg cases. The spiderlings also had a better chance of surviving into early winter.In areas that weren't hit by storms, docile colonies thrived.These findings were consistent even as the storms varied in duration, intensity and size. The researchers believe this shows that extreme events can shape animal behaviors. They would like to conduct more long-term studies to learn whether this is the case. 3250

In case you’re wondering how an arrest in NYC goes down. The guy has made absolutely no indication that he would flee or fight and wasn’t trying to hide.If you can’t see, the reason everyone moved was because all the police had taken out their guns and aimed at him. pic.twitter.com/dAstrtMntz— Elad Nehorai (@PopChassid) October 25, 2019 350

Iranian state TV, citing a military statement, says the country ‘unintentionally’ shot down a Ukrainian jetliner, killing all 176 aboard. The statement came Saturday morning. It blames “human error” for the shootdown.Originally, Iran claimed that the crash was due to a mechanical error. But intelligence from the U.S. and Canada coupled with video of the incident suggested that the plane was brought down. Wednesday's incident came mere hours after Iran fired missiles on two Iraqi bases that house US troops. 524

KATY, Texas (AP) — Authorities say a 14-year-old boy shot and wounded his older sister and killed her boyfriend during “a house party gone bad” in a Houston suburb.Harris County Sheriff Ed Gonzalez says on 218

John DeGarmo keeps busy as a father to six children.He's also been a foster parent to dozens of other children, which brought the impact of the opioid crisis right into his home. Several of his foster kids were born addicted, including three children he adopted."They suffer with challenges in focusing, with reading, with learning skills with mood swings," DeGarmo said. "You know, it really affects the whole child."Anita, who did not give her last name for privacy reasons, is another parent dealing with the aftereffects opioids have on children in the foster care system."My oldest came with a lot of issues," the foster parent said. "He slept of the floor for the longest time, would not sleep in a bed, no matter what I tried."According to the latest figures, one in three children now enter foster care because of their parents' drug abuse.The number of children in foster care has jumped for the fifth consecutive year, fueled by the opioid epidemic. And foster care advocates across the country say there's not enough foster parents.The problem is such an issue it got the attention of congress.Lawmakers 1127

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