Projected Warming of Wisconsin Streams Could Negatively Affect Trout plus 1 more

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Title: USGS Newsroom

Projected Warming of Wisconsin Streams Could Negatively Affect Trout plus 1 more

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Projected Warming of Wisconsin Streams Could Negatively Affect Trout

Posted: 16 Apr 2015 12:30 PM PDT

Summary: Annual average stream temperatures in the Trout Lake watershed, Wisconsin, could increase from one to three degrees Celsius by the year 2100, which might negatively affect cold water fish like brook trout

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Contact Information:

Marisa Lubeck ( Phone: 303-202-4765 );

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Annual average stream temperatures in the Trout Lake watershed, Wisconsin, could increase from one to three degrees Celsius by the year 2100, which might negatively affect cold water fish like brook trout.  

The U.S. Geological Survey recently modeled the effects of climate change on stream temperatures for three recreational fishing creeks near Eagle River, Wisconsin, from years 2000-2100: Stevenson Creek, North Creek and Upper Allequash Creek. Findings suggest that daily mean stream temperatures in Stevenson Creek, the warmest of the three streams, could become too high to sustain a healthy trout population by the turn of the century. 

“A persistent increase in daily mean stream temperature can affect the diversity of fish species in northern Wisconsin,” said USGS scientist William Selbig. “This study can be used by managers to help make important conservation decisions in the Trout Lake watershed.” 

The new USGS report, authored by Selbig, is published in the journal Science of the Total Environment. 

Summer stream temperature is the most important single factor influencing distribution and production of some cold water fishes. Streams that may currently be suitable as a cold water sport fishery, like those in the new study, could become increasingly fragmented as fish seek refuge from warming water temperatures to less impacted areas. 

Brook trout populations are most stable when temperatures do not exceed 19 degrees Celsius, or about 66 degrees Fahrenheit. Selbig found that the frequency at which daily mean stream temperatures exceeded ideal ranges for brook trout increased for Stevenson Creek and North Creek during the last five years of the study period, especially in the warm summer months of July and August. 

“Some emission scenarios indicate that Stevenson Creek could become too warm to maintain its status as a Class II trout stream,” Selbig said.  

However, the coolest of the three streams, Upper Allequash Creek, appeared resilient to climate warming, with temperatures remaining suitable for cold water fish the majority of time. 

The projections showed that by 2100, annual average temperatures could increase by:

• 1.7 to 3.2 degrees Celsius in Stevenson Creek,
• 1.4 to 2.9 degrees Celsius in North Creek and
• 1.1 to 2.2 degrees Celsius in Upper Allequash Creek. 

For more information on water resources in Wisconsin, please visit the USGS Wisconsin Water Science Center website. 

Model Offers More Ease, Precision for Managing Invasive Asian Carp

Posted: 16 Apr 2015 12:30 PM PDT

Summary: The likelihood of Asian carp eggs being kept in suspension and hatching in the St. Joseph River in Michigan has been further evaluated using a model that examines a range of multiple flow and water temperature scenarios

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Contact Information:

Jennifer LaVista ( Phone: 303-202-4764 ); Elizabeth Murphy ( Phone: 217-328-9726 );

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The likelihood of Asian carp eggs being kept in suspension and hatching in the St. Joseph River in Michigan has been further evaluated using a model that examines a range of multiple flow and water temperature scenarios. Results illustrate the highest percentage of Asian carp eggs at risk of hatching occurs when the streamflow is low and when the water temperature is high. This new study by the University of Illinois and the U.S. Geological Survey is published in the Journal of Great Lakes Research.

“In this study, the Fluvial Egg Drift Simulator (FluEgg) model allowed us to examine the complex dependencies between flow, temperature and egg development,” said USGS hydrologist Ryan Jackson. “This information provides resource managers with a range of conditions under which the St. Joseph River is vulnerable to Asian carp reproduction."

The FluEgg model was used to evaluate egg movement and the likelihood of successful Asian carp reproduction under different streamflow and temperature conditions representative of historical spawning seasons in the St. Joseph River, a tributary to Lake Michigan. Results show that eggs develop faster at warmer water temperatures, therefore requiring less time to drift in the river until hatching. Low streamflows can also be conducive to reproduction when the streamflow is just fast enough to keep most of the eggs in suspension while allowing for the greatest amount of drift time before reaching the lake, thus increasing the likelihood of hatching.

The FluEgg model, developed by University of Illinois researchers in collaboration with the USGS, was first introduced in 2013. The latest version of the model is available online, and includes a user-friendly interface and improved predictions of egg transport in rivers.

Invasive Asian carp consume plankton from the base of the food web and reproduce prolifically which could pose substantial environmental risks and economic impacts to the Great Lakes if they become established. 

"This work focuses on the early life stages of Asian carp," said USGS research fish biologist Duane Chapman. "Targeting early life stages can include disrupting spawning activities or egg development in rivers where Asian carp spawn."

Several factors affect the viability of the eggs. The temperature of the water affects how long the eggs need to hatch, and the velocity of the river affects the movement of the eggs and whether the eggs remain in suspension or sink to the bottom. Eggs that settle on the riverbed will likely die, and eggs that are transported down the river and into a lake may not have enough time to develop to the hatching stage before settling to the lakebed.

The reproduction assessment of Asian carp eggs in the St. Joseph River demonstrated the complexity of the problem where the length of the river, velocity and water temperatures cannot be assessed individually. Rather, a holistic analysis is required, where egg development, water-quality characteristics and the hydrodynamics of the river are interconnected and analyzed together. 

“Successful reproduction requires a fine balance between the rate of egg development and the variable flow conditions present in a river required to maintain the eggs in suspension,” said Tatiana Garcia, USGS research hydrologist and lead author of the paper.

The paper, “Application of the FluEgg model to predict transport of Asian carp eggs in the St. Joseph River (Great Lakes tributary)” by Tatiana Garcia, Elizabeth A. Murphy, Patrick R. Jackson and Marcelo H. Garcia, is available online.