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When will the mayflies arrive?

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When will the mayflies arrive?


Temperature, wind and other environmental factors control the timing and number of mayflies that reach the shores of Lake Erie and Lake St. Clair.

In early summer along the western shores of Lake Erie and Lake St. Clair many people wonder, when will the mayflies (also known as fish flies) arrive and how many will there be this year?

First, a few key facts about mayflies. Mayflies are aquatic insects that live most of their lives in the water. Mayflies overwinter in sediments at the bottom of lakes and streams. Pollution and lack of oxygen in bottom sediments killed off Lake Erie’s mayflies in the early 1950s, and they remained rare for forty years. Mayfly populations began to rebound in the early 1990s and reached their density management goal 1997, which means there are enough to support other species.

Mayflies emergence in great numbers is part of their defense mechanism so that not all of them will be eaten and some can reproduce. Photo: Todd Marsee, Michigan Sea Grant.

Mayflies are an important food for birds and fish such as yellow perch. The presence of mayflies is considered an indicator of good water quality. Mayflies emerge from the water so that they can mate and lay eggs on the water surface. The eggs will later fall into the bottom sediments. Find out more online about the mayfly lifecycle and how you can reduce the number appearing in your backyard.

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What controls the timing of mayfly emergence?

The timing of mayfly emergence from sediments is based on the water temperature. Mayflies emerge after the water temperature at depth reaches 20 degrees Celsius (68 degrees Fahrenheit). In the western Lake Erie basin and Lake St. Clair, water is shallow enough that the water temperature at the surface is only a few degrees different from the temperature at depth.

How do I know what the water temperature is in Lake Erie or Lake St. Clair?

You can monitor the surface water temperature via buoys. A few days after buoys indicate a temperature of 20 degrees Celsius, the sediments will also warm to that temperature and mayflies will start to emerge. The National Oceanic and Atmospheric Administration has an experimental forecast product for bottom water depths that is frequently updated. You can also view current temperatures on the Seagull platform, part of the Great Lakes Observing System. This way you can tell in real-time when mayflies will begin to emerge.

If mayflies only live outside of water for two days, why does the mayfly “season” continue for several months (typically June through August)?

Scientists do not understand why mayflies persist so long. Mayflies emerge in different cohorts. One cohort has gone through several growth stages and is almost ready to emerge in late summer or fall but is prevented by the declining temperatures. These are the first cohorts to emerge the following summer. Individuals in the second cohort are smaller in the fall and are not ready to emerge until later in the following summer. There are also two similar but separate species of mayflies in Lake Erie and they may develop at slightly different rates.

Can you predict how many mayflies will emerge this year?

It is hard to predict how many mayflies will emerge because there are a number of environmental factors that control the number of mayflies. These factors include the number of mayflies that survive the winter as well as the oxygen levels at depth in Lake Erie. A harsh winter may mean fewer mayflies survive. Low oxygen conditions at depth can also suffocate the mayfly larvae in the sediments.

How many mayflies will reach my backyard?

Not all mayflies that emerge will reach land. Mayflies may land on islands instead. Wind speed and direction impacts whether mayflies from the Canadian side of Lake Erie end up on land in the United States or vice versa. Mayfly swarms are expected within a few days of water temperatures reaching 20 degrees Celsius and may continue up to 10 days (Corkum et al., 2006). In many cases, swarms are large enough to appear on weather radar at this time.

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When you see mayflies, remember they are a sign of healthy local water bodies and that the mayflies are providing food for birds and fish you like to watch or catch!

Michigan Sea Grant helps to foster economic growth and protect Michigan’s coastal, Great Lakes resources through education, research and outreach. A collaborative effort of the University of Michigan and Michigan State University and its MSU Extension, Michigan Sea Grant is part of the NOAA-National Sea Grant network of 34 university-based programs.

Citation: Corkum, L.D., Ciborowski, J. J. H., and Dolan, D. M. 2006. Timing of Hexagenia (Ephemeridae: Ephemeroptera) mayfly swarms: Canadian Journal of Zoology v. 84 n. 11, pg. 1616-1622.

This article was prepared by Michigan Sea Grant under award NA22OAR4170084 from the National Oceanic and Atmospheric Administration, U.S. Department of Commerce through the Regents of the University of Michigan. The statement, findings, conclusions, and recommendations are those of the author(s) and do not necessarily reflect the views of the National Oceanic and Atmospheric Administration, the Department of Commerce, or the Regents of the University of Michigan.

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Michigan

University of Michigan didn't assess if Israel-Hamas war protests made environment hostile, feds say

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University of Michigan didn't assess if Israel-Hamas war protests made environment hostile, feds say


WASHINGTON – The University of Michigan failed to assess whether protests and other incidents on campus in response to the Israel-Hamas war created a hostile environment for students, staff and faculty, according to the results of an investigation by the U.S. Education Department announced Monday.

The department’s Office of Civil Rights investigated 75 instances of alleged discrimination and harassment based on shared Jewish ancestry and shared Palestinian or Muslim ancestry. The investigation found that the university’s responses did not meet its Title VI requirements to remedy the hostile environment.

In one instance, when a Jewish student reported being called out for viewing a graduate student instructor’s social media post about pro-Palestinian topics, the university told the student that “formal conflict resolution is not a path forward at this time,” because the incident occurred on social media.

In another instance, when a student who participated in a pro-Palestinian protest was called a “terrorist,” the university said it held “restorative circles” to address the incident but did not take further action.

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In its resolution agreement, the University of Michigan agreed to administer a climate assessment, implement additional training and revise its policies as necessary. It also agreed to monitoring by the Office of Civil Rights through the end of the 2026 school year, reporting its responses to future incidents of discrimination to the department.

It’s the first investigation to reach a conclusion among dozens launched by the Education Department since Oct. 7, the day Hamas launched a surprise attack on Israel.

Complaints of antisemitism and Islamophobia have led to inquiries at more than 100 universities and school districts, including Harvard and Yale, community colleges and public schools from Los Angeles to suburban Minneapolis.

The complaints vary widely but all accuse schools of violating Title VI of the Civil Rights Act of 1964, which prohibits discrimination based on race, color or national origin. Colleges and schools are required to protect students from discrimination, and when they don’t, the Education Department can invoke penalties up to termination of federal money.

Protests over the Israel-Hamas war upended the final weeks of the school year at many campuses across the country, with some cancelling graduation ceremonies or moving classes online after Pro-Palestinian protesters set up encampments in campus spaces.

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The protests have tested schools as they aim to balance free speech rights and the safety of students. The Education Department has issued guidance detailing schools’ responsibilities around Title VI, but the results of the agency’s investigations could provide a clearer line showing where political speech crosses into harassment.

Finding that boundary has been a struggle for colleges as they grapple with rhetoric that has different meaning to different people. Some chants commonly used by pro-Palestinian activists are seen by some as antisemitic.

Some of the federal complaints under investigation argue that those phrases should be barred, including “from the river to the sea, Palestine will be free” and “intifada revolution.”

Meanwhile, some complaints say Arab and Muslim students have faced abuses only to be ignored by campus officials. At Harvard, the Education Department is investigating separate complaints, one over alleged antisemitism and the other over alleged Islamophobia.

More investigations are expected to be resolved in the coming weeks, but Education Secretary Miguel Cardona said his agency is struggling to keep up with the influx of cases.

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Republicans have rejected requests to increase money for the Office for Civil Rights in recent years, while the average case load increased to 42 per investigator in 2023. Without more money, that figure could increase to more than 70 cases per investigator, Cardona has said.

“We are desperately in need of additional support to make sure we can investigate the cases that we have in front of us,” Cardona told members of the House in May.

On average, cases take about six to eight months to resolve. The vast majority of the agency’s civil rights investigations end with voluntary resolutions. Schools usually promise to resolve any lingering problems and take steps to protect students in the future.

While the Education Department investigates, several colleges and school districts have separately been called before Congress to answer allegations of antisemitism. Republicans have held a series of hearings on the issue, grilling leaders accused of tolerating antisemitism.

The hearings contributed to the resignations of some college leaders, including Liz Magill at the University of Pennsylvania and Harvard’s Claudine Gay, who was also embroiled in accusations of plagiarism.

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___

The Associated Press’ education coverage receives financial support from multiple private foundations. THe AP is solely responsible for all content. Find the AP’s standards for working with philanthropies, a list of supporters and funded coverage areas at AP.org.

Copyright 2024 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed without permission.



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'There goes the trampoline'; Storm damage, power outages in southwest Michigan

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'There goes the trampoline'; Storm damage, power outages in southwest Michigan


Severe storms blew through southwest Michigan Sunday night causing some damage and power outages in the region.

The hardest hit areas are in Van Buren County where a tornado warning was in effect around 10 p.m. Sunday. A fire official reported a tornado on the ground east of Gobles and about 7 miles southwest of Otsego.

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Jeremiah Ashbrook of Bloomingdale captured video of high winds that sent his trampoline flying into a field.

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Storm Damage Video: Trampoline flies away, Jeremiah Ashbrook

It also caused some damage to a portion of his house.

Bloomingdale Damage

Jeremiah Ashbrook

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Another viewer sent in photos showing a flipped dock and boat lift on Long Lake in Van Buren County. Their boat ended up at the neighbor’s place.

Long Lake Damage

The National Weather Service has received these reports of damage as of early Monday morning.

  • Lots of damage in Pine Grove and Bloomingdale areas extending to Gobles. A number of trees down, power lines down. One power pole snapped in half, one tree on house, one tree on car. No reported injuries.
  • Number of trees and power lines down with power outages between Texas Corners NE to the Oakwood Area in Kalamazoo County
  • “Bright electric flash” on soaked road as power went out between I-94 and US-131 interchange. Possibly a live line falling into the standing water.
  • Tree limbs down in Lexington Green area in Portage
  • 76 mph wind gust in Kalamazoo County

As of 11:30 p.m., Consumers Energy reports more than 21,000 customers are without power. Most outages are in Allegan, Kalamazoo, and Van Buren counties. You can see the current outages HERE.

If you do lose power, Consumers Energy recommends unplugging sensitive electronics like computers, TVs and printers to prevent electrical damage when power is restored.

If you use a generator, Consumers Energy says to never place it in your basement, garage or other enclosed space. Keep generators away from any air intakes to avoid carbon monoxide poisoning.

Consumers Energy says a downed power line should be given a 25-foot buffer. If you spot a downed power line that has not been marked, call 9-1-1 and Consumers Energy 1-800-477-5050.





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9 wounded in shooting at splash pad in Michigan

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9 wounded in shooting at splash pad in Michigan


9 wounded in shooting at splash pad in Michigan – CBS News

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At least nine people, including two children, were wounded when a man opened fire at a splash pad in the Detroit suburb of Rochester Hills. The gunman, identified as 42-year-old Michael William Nash, died by suicide. CBS Chicago’s Charlie De Mar reports.

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