Rock Island Ecological Services Field Office
Midwest Region

 

 

 

Rock Island Field Office

Ecological Services
1511 47th Avenue
Moline, IL  61265

Phone:  309-757-5800
Fax: 309-757-5807
Federal Relay:  800-877-8339
 

Email: RockIsland@fws.gov

 

 

 

 


Connect With Us


 

Facebook icon FaceBook

Flickr icon Flickr
RSS RSS Twitter icon Twitter
Blogger icon Blog YouTube icon YouTube

 

 

 

 

Environmental Contaminants

 

Cedar River Mussel Biomonitoring (Iowa)

 

Data from the 2011 field season

Figure 1. Mussel growth over the summer of 2011. 

The mesh size of the chamber screen is one millimeter.   

Mussels 081011
June 7, 2011 July 8, 2011 August 10, 2011

 

 

Table 1.  Initial average size of fat mucket for each mussel silo and placement location.

 
Mussel Silo Number Initial (June 7) Average
Mussel Length

millimeters (n=10)

Location
1  15.5 Gravel bar at Palisades State Park
2  15.5

"

3  15.6 Ford at Palisades State Park
4  15.1

"

5  15.7 Palo bridge
6  15.6

"

 

Table 2.  Survival and growth of mussels in each mussel silo.

Mussel Silo Number July 8 2011 August 10, 2011
1 9 dead, 1 livea - sedimentation; 21.86% growth n/a
2 10 dead, 0 live - sedimentation n/a
3 10 dead, 0 live - sedimentation 1live - standed; 5.64%growth
4 0 dead, 10 live; 72.07% growth 5 dead, 5 live - stranded; 5.64% growth
5 0 dead, 10 live; 106.01% growth 10 dead, 0 live - sedimentation
6 0 dead, 9 live; 98.08% growth 0 dead, 9 live - partially stranded: 13.86% growth

a chamber #3 replaced with chamber #1 with one live mussel

 

Figure 2. Mussel growth chart over the summer of 2011.    

mussel growth chart

 

 

Table 3.  Water quality conditions at the mussel biomonitoring locations in the Cedar River.

The measurements were taken with a calibrated Hydrolab Quanta meter.

Palisades State Park June 7, 2011 July 8, 2011 August 10, 2011
Temperature (F) 79.8 80.7 74.3
Conductivity (uS/m3) 576 564 475
Dissolved Oxygen (mg/L) 8.55 13.13 10.92
Oxygen Percent Saturation 128.8 181.9 145.3
pH 9.27 9.73 9.47
Turbidity (NTU) 54.3 25.8 76.4
Time 1417 1221  

 

Palo Bridge June 7, 2011 July 8, 2011 August 10 2011
Temperature (F) 79.9 79.7 76.8
Conductivity (uS/m3) 548 555 432
Dissolved Oxygen (mg/L) 8.9 10.88 13.35
Oxygen Percent Saturation 120.4 161.7 186
pH 9.34 9.66 10.1
Turbidity (NTU) 77.1 51.3 39.1
Time 1612 1450

 

 

Return to Cedar River Biomonitoring Home

 

Rock Island Field Office Home

 

 

 

Last updated: January 11, 2013