Wetland and Aquatic Research Center

Multimedia

Explore WARC's multimedia resources.

Filter Total Items: 61
A desmid alga is bright red and green photographed in UV light
December 31, 2017

This single-celled alga is a natural ornament

It looks like a holiday ornament, but this lovely object is a single-celled freshwater alga from the desmid family, found in the marshes of Florida’s Arthur R. Marshall Loxahatchee National Wildlife Refuge. USGS biologist Barry Rosen photographed it at 200x magnification using ultraviolent light and a fluorescence microscope. Desmids range in size from under 10 microns—

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Graph of the rate of change in Lousiana coastal wetlands from the 1930s to the present
December 31, 2017

Louisiana coastal wetland change rates over time

Graph of land area change rate in coastal Louisiana from 1932–2016.  The red line approximates the long-term land area change rate. 95 out of 100 statistical analyses would produce a very similar trend (dotted blue lines). Credit: USGS

A Cuban treefrog on a green leaf
November 13, 2017

Cuban treefrogs have leaped into Louisiana

Non-native Cuban treefrogs have established a breeding population in New Orleans, Louisiana, the first such population on the U.S. mainland outside Florida. The treefrogs were discovered at the Audubon Zoo shortly after a shipment of palm trees from Florida were planted in the zoo's elephant enclosure in 2016. USGS scientist Brad Glorioso confirmed the presence of a

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Map of offshore survey sites from Virginia to Georgia
September 12, 2017

Areas to be surveyed on first Deep SEARCH research cruise

Map of target areas to be surveyed during the first phase of the Deepwater Atlantic Habitats II study, 
DEEP SEARCH, including seep targets. USGS image.

Map of offshore survey sites from Virginia to Georgia
September 12, 2017

Study area for first Deep SEARCH research cruise

Map of target areas to be surveyed during the first phase of the 
Deepwater Atlantic Habitats II study,  DEEP SEARCH, including seep targets. USGS image.

Photomicrograph of a green desmid alga resembling a holiday ornament
August 31, 2017

A natural marvel in a single cell

This single-celled freshwater algae wasa collected as part of the first-ever study of the green algae family called desmids in Florida’s Loxahatchee National Wildlife Refuge, in the northern Everglades. USGS biologist Barry H. Rosen, an expert on freshwater algae who leads the study, used a technique called differential interference microscopy to highlight the relief of

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chart of vegetation change in the bird's foot delta
July 31, 2017

Changing vegetation in the Delta 2016-2017

Chart showing changes in vegetation density in the Mississippi River delta in Louisiana, May 2015-May 2016. From a USGS Open File Report published in July 2017 by co-authors Elijah Ramsey III and Amina Rangoonwala,

Aerial view of southeast Louisiana coastal marshes
July 10, 2017

Louisiana's Coastal Wetland Loss Rate Continues to Slow

An aerial view of southeast Louisiana coastal marshes. 

Satellite images of the same marsh in 2008 and 2016
July 10, 2017

Restoration projects help some Louisiana coastal wetlands rebuild

Satellite images of the same wetland taken in 2008 and 2016 show a wetland restoration project has produced some gains in marsh area.

Map shows early wetland losses in red, recent losses in purple
July 10, 2017

Map shows early wetland losses in red, recent losses in purple

This map shows the historic trend in wetland losses, with early losses in red and the most recent ones in purple.

Phragmites under stress in Pass A Loutre, Louisiana
May 31, 2017

High stakes, big questions in marsh grass die-back

Brown patches and brown stems show stress in this phagmites (roseau cane) stand in Pass A Loutre Wildlife Management Area, a tract of state-owned land in Louisiana's bird foot delta, where the Mississippi River meets the Gulf of Mexico. An ongoing phragmites was first discovered in spring 2017 and blamed on an invasive scale insect from Asia. But a new USGS report, based

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Scientist holding a laptop and equipment, standing in a green field.
April 30, 2017

Assessing Tallgrass Coastal Prairie in Southwest Louisiana

Vegetation assessments are part of an effort to produce seamless, consistent, and high resolution landcover data for the northern portion of the western gulf coastal plain. This geography was once dominated by tallgrass prairie and has undergone dramatic change with less than 1% of this natural habitat in existence.

Tallgrass prairie provides a suite of ecosystem

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