in the UP. Historically, the last of the species, or subspecies, was extirpated near Newberry in 1906, although there have been sightings of the creatures over the years since. These reports increased in number over the first decade of the 21st century. The Michigan Department of Natural Resources and Environment (DNRE) formed a four-person team to investigate sightings in the state. The biologists with the DNRE currently do not believe that there is a breeding population anywhere in the state, rather that the sighted animals are visitors to the state. As late as January 2007, the DNRE's official position was that no cougars lived in Michigan. Several residents in the state disagree with both current and previous positions on the part of the DNRE. Researchers at Central Michigan University and the Michigan Wildlife Conservancy in 2006 published the findings of a study using DNA analysis of fecal samples taken in the Upper and Lower peninsulas that showed the presence of cougars at the time. These results were disputed in a second journal article in 2007 by other researchers from Eastern Michigan University and the U.S. Forest Service. A citizen's group, the Michigan Citizens for Cougar Recognition (MCCR), independently tracked sightings and in 2009 listed Delta County as the location with the greatest number of reports in the state. The DNRE verified five sets of tracks and two trail camera photos in Delta, Chippewa, Marquette, and Menominee counties since 2008. DNRE officials acknowledge that there are cougars in the UP, but not elsewhere in the state. Critics of the DNRE's position on the species, including the founder of the MCCR, say that the department is attempting to "avoid paying for a cougar management program". There are also many invasive species that are primarily brought in the ballast water of foreign ships, usually from the ocean bordering Northeastern Asia. This water is dumped directly into the Great Lakes, depositing a variety of fresh and salt water fish and invertebrates, most notably the zebra mussel, Dreissena polymorpha. There are also many plant species that have been transported to the Great Lakes, including purple loosestrife, Lythrum salicaria and Phragmites australis, both of which are considered to be a threat to native hydrophyte wetland plants. The emerald ash borer was first reported in the UP at Brimley State Park, and is considered to be a serious ecological threat to the habitat and economy. Climate The