郑州散光和近视的区别(郑州哪个眼科医院好啊) (今日更新中)

SEATTLE (AP) — U.S. scientists said Friday they will investigate why an unusual number of gray whales are washing up dead on West Coast beaches.About 70 whales have been found dead so far this year on the coasts of California, Oregon, Washington and Alaska, the most since 2000. About five more have been discovered on British Columbia beaches. That's a very small fraction of the total number of whales believed to have died, because most simply sink and others wash up in such remote areas they're not recorded.NOAA Fisheries on Friday declared the die-off an "unusual mortality event," providing additional resources to respond to the deaths and triggering the investigation."Many of the whales have been skinny and malnourished, and that suggests they may not have gotten enough to eat during their last feeding season in the Arctic," agency spokesman Michael Milstein told reporters during a conference call.The eastern North Pacific gray whales were removed from the endangered species list in 1994, after recovering from the whaling era.The population has grown significantly in the last decade and is now estimated at 27,000 — the highest since surveys began in 1967. That has raised questions about whether their population has reached the limit of what the environment can sustain. Another theory suggests that the loss of Arctic sea ice due to global warming is a culprit.The whales spend their summers feeding in the Arctic before migrating 10,000 miles (16,000 km) to winter off Mexico. Though they eat all along their route, they are typically thinning by the time they return north along the West Coast each spring.They eat many things, but especially amphipods, tiny shrimp-like creatures that live in sediment on the ocean floor in the Arctic. For many years, researchers noted that fewer calves tended to be born following years when the ice in the Chukchi Sea, north of the Bering Strait between Alaska and Russia, was late to melt. The whales had less time to feast because they couldn't access the feeding area, and thus had less blubber to sustain them on their next migration.Last year, though, the Artic was unusually warm. The whales weren't blocked from the feeding area, and yet are still struggling this year. That has scientists wondering if the loss of sea ice has led to a loss of algae that feed the amphipods. Surveys show the amphipod beds moving farther north, said Sue Moore, a biological oceanographer at the University of Washington."The sea ice has been changing very quickly over the last decade or so," she said. "The whales may have to shift to other prey, such as krill or other things they eat."In an average year, about 35 whales wash up in the U.S.In 2000, more than 100 did, prompting NOAA to declare an "unusual mortality event" then as well. The resulting investigation failed to identify a cause. The die-off followed strong changes in ocean conditions in the mid-1990s, suggesting that warmer water patterns affected the availability of prey, but scientists were often unable to perform necropsies, Moore said."It's sometimes very difficult to get to these whales in a timely fashion," she said. "You can't always get the kind of samples you would need for diagnostic reasons."Since then, researchers have built up an improved network of volunteers and have better educated the public to help report and respond to whale deaths, said Deborah Fauquier, veterinary medical officer at NOAA's Office of Protected Resources. This time around, scientists have been able to perform necropsies on 20 of the whales, she said.John Calambokidis, a research biologist with the Cascadia Research Collective, noted that as the whales search farther afield for food, they've entered areas where they're not normally seen so often, including San Francisco Bay and Puget Sound. That puts them at higher risk of being struck by ships or entangled in fishing gear.Four of the 10 gray whales found dead near San Francisco this year were struck by ships, and a number of shipping companies have slowed their vessels in the area to avoid collisions. 4086

SAN FRANCISCO (AP) — The coronavirus doesn't appear to have devastated homeless people as initially feared. But researchers say there are many unknowns about how the pandemic is affecting people without a place to sleep. San Francisco has reported more than 200 infections of homeless people, and New York City has tallied more than 1,400. San Diego’s convention center is housing homeless residents, where officials have administered more than 6,000 tests and uncovered just 18 positive for COVID-19. At the onset of the pandemic, cities thinned out shelters and moved homeless people into hotels because they often have chronic health issues. Advocates say they're surprised the population hasn't been hit harder, but there's not enough data to draw conclusions. 772

SAN MARCOS, Calif. (KGTV) - Bedbugs, the bane of many homeowners, were discovered lurking inside several San Diego County buildings last week.10News was tipped off to a bedbug infestation at a county building: the Agricultural Weights and Measures building in San Marcos.The county confirmed to 10News, bedbugs were found there and another building from the same department in Kearny Mesa.  As for how it happened, a county spokesperson revealed only that an employee is the cause and public areas were not affected.Workers from the Agricultural Weights and Measures Department, which provides pest control for the county, have laid traps, monitored for bed bugs, and moved employees to a separate area.Garrett Thrasher is Vice President of Thrasher Pest Control.  He says the typical plan of attack could also involve K9 alerting, vacuuming, steam cleaning and sometimes chemical treatments."From there, it's weekly checks to make sure there is no new activity or complaint," said Thrasher.Thrasher says bedbug calls have been increasing over the last few months and are slightly up from the same time last year. 1161

SANTEE, Calif. (CNS) - Gov. Gavin Newsom signed into law a bill authored by Sen. Brian Jones, R-Santee, which extends immunity from liability for local governments that operate skate parks, the lawmaker announced Tuesday.Senate Bill 1003 follows a similar bill Jones wrote in 2015 while he was a member of the Assembly that provided a four-year immunity window for municipally operated skate parks. SB 1003 makes that immunity permanent."Senate Bill 1003 grants much-needed immunity from liability for communities that operate skate parks," Jones said. "Local skateboarders and sport riders get a safer place than the streets to carve, do McTwists or ollies, and taxpayers are not going to be liable for the occasional mishap that is inherent to all active sports."SB 1003 was sponsored by the County of San Diego, and as an urgency measure, goes into effect immediately.The bill was co-authored by Sens. Pat Bates, R-Laguna Niguel, and Ben Hueso, D-San Diego -- who both also represent parts of San Diego County -- and Sen. Brian Dahle, R-Bieber. 1055

SAN MARCOS, Calif. (KGTV) - A driver told 10News she was terrified as she crashed through the front of a San Marcos doggy daycare Friday morning. The crash happened at Sandy Pawz, 630 Nordahl Road, as a crowd looked on. The driver was reportedly distracted by her own dog. “She decided to help me drive, and jumped up,” said the woman who only wanted to be identified as Robin. “Everything was crashing down on my windshield and I didn't know what was in front of me.” The car went past the front lobby and through drywall into a second room. “I consider myself a very smart person but I froze out of fear...fear, and then I thought I was going to die.” No pets or people were harmed. The business did not have any major structural damage. 747

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