The Role of Dissolved Organic Material in Regulating Primary Production in Prairie Saline Lakes

UMaine Alert

Posted: April 19, 2024 - 1:32 PM

At approximately 9:24 a.m. on Friday, April 19, a University of Maine graduate student was struck by a university vehicle on Long Road at the University of Maine campus in Orono. The student reports that they are at a local hospital with minor injuries.

Emergency services, including the Orono Fire Department, University Volunteer Ambulance Corps, University of Maine Police Department, Orono Police Department and Penobscot County Sheriff’s Office responded to the scene.

The university vehicle involved in the incident was a Chevrolet Express van. It was being operated by a university employee.

Counseling services and support are available for students, faculty or staff who may have been affected. The Counseling Center can be reached at 207-581-1392 and the Dean of Students Office can be reached at 207-581-1406.

The scene has been cleared and Long Road is now accessible. An investigation is being conducted by the University of Maine Police Department with assistance from the Penobscot County Sheriff’s Office Crash Reconstruction Unit. Any witnesses to the incident are encouraged to contact Lt. Noel Santiago at noel.santiago@maine.edu.

May 31, 2009 Expeditions 2006, Expeditions 2009

Northern Great Plains – North Dakota

The Role of Dissolved Organic Material in Regulating Primary Production in Prairie Saline Lakes

Jasmine Saros, Courtney Wigdahl, Carmen Daggett

August 2006, May 2009

Lake ecosystems are often defined in terms of a trophic paradigm, in which lake productivity is considered a direct function of nutrient loading. This paradigm has been modified to include the role of dissolved organic matter (DOM) in regulating this process, based on the effects of this material in forest-dominated aquatic ecosystems. However, the role of DOM in lakes situated in other types of ecosystems, such as grasslands, is presently unclear. Grasslands and converted grasslands (i.e. agricultural land) cover extensive areas in arid and semi-arid regions of the world. Lakes situated in grasslands are usually saline or sub-saline and have high concentrations of uncolored DOM. Due to the different nature of DOM in prairie lakes, the role of this material in these systems may be quite different from that in forest dominated aquatic ecosystems, and here we investigated the role that DOM plays in regulating primary production in prairie saline lakes via its effect on nutrient dynamics.