Distribution of crayfish in the Southern Basin of Lake Michigan and the Greater Chicago Region

2021 ◽  
Author(s):  
Erin M. O'Shaughnessey ◽  
Rachel Egly ◽  
Brandon Harris ◽  
Bradley Smith ◽  
Reuben P. Keller
Keyword(s):  
Lake Michigan ◽  
Southern Basin

scholarly journals Continued disappearance of the benthic amphipod Diporeia spp. in Lake Michigan: is there evidence for food limitation?

2006 ◽  
Vol 63 (4) ◽  
pp. 872-890 ◽  
Author(s):  
Thomas F Nalepa ◽  
David L Fanslow ◽  
Andrew J Foley III ◽  
Gregory A Lang ◽  
Brian J Eadie ◽  
...  
Keyword(s):  
Lipid Content ◽  
Laboratory Experiments ◽  
Lake Michigan ◽  
Food Limitation ◽  
Sediment Traps ◽  
Dreissena Bugensis ◽  
Southern Basin ◽  
Time Period ◽  
Benthic Food ◽  
Southeastern Region

Benthic surveys were conducted in the southern basin of Lake Michigan and throughout the lake to assess trends in benthic populations, emphasizing recent changes in densities of the benthic amphipod Diporeia spp. and dreissenid mussels. In the southern basin, Diporeia populations declined 89%, 91%, and 45% between 1993 and 2002 at sites <30, 31–50, and 51–90 m, respectively. Lakewide, the population declined 65% between 1994–1995 and 2000. Over the same time period, dreissenid densities, particularly Dreissena bugensis, increased. Intensive studies at 45 m sites in the southeastern region examined changes in lipid content, age structure, and benthic food inputs relative to the hypothesis that food limitation was a factor in Diporeia's disappearance. As Diporeia densities declined to zero, length–weight remained unchanged, and lipid content generally increased. Recruitment still occurred, but the young did not survive to become adults. Based on organic carbon, biogenic silica, and chlorophyll collected in sediment traps and found in the upper sediments, pelagic inputs to the benthic region still occurred. Our field observations and laboratory experiments did not disprove the hypothesis that food limitation from dreissenid filtering activities was the cause of the decline, but direct relationships between the loss of Diporeia and indicators of food availability were difficult to establish.

Cadmium in the Southern Basin of Lake Michigan

1981 ◽  
Vol 15 (1) ◽  
Author(s):  
J. Muhlbaier ◽  
G.T. Tisue
Keyword(s):  
Lake Michigan ◽  
Southern Basin

Sediment Trap Studies in Lake Michigan: Resuspension and Chemical Fluxes in the Southern Basin

1984 ◽  
Vol 10 (3) ◽  
pp. 307-321 ◽  
Author(s):  
Brian J. Eadie ◽  
Richard L. Chambers ◽  
Wayne S. Gardner ◽  
Gerald L. Bell
Keyword(s):  
Sediment Trap ◽  
Lake Michigan ◽  
Southern Basin

Yellow perch (Perca flavescens) stock structure in Lake Michigan: an analysis using mark–recapture data

2008 ◽  
Vol 65 (9) ◽  
pp. 1919-1930 ◽  
Author(s):  
David C. Glover ◽  
John M. Dettmers ◽  
David H. Wahl ◽  
David F. Clapp
Keyword(s):  
Gene Flow ◽  
Yellow Perch ◽  
Site Fidelity ◽  
Lake Michigan ◽  
Perca Flavescens ◽  
Stock Structure ◽  
Mark Recapture ◽  
Southern Basin ◽  
Spawning Site ◽  
Stock Differentiation

To evaluate the stock structure of yellow perch ( Perca flavescens ) in the southern basin of Lake Michigan and in Green Bay, we analyzed recaptures from a lake-wide mark–recapture study implemented from 1996 to 2001 to infer the range and pattern of movement and spawning-site fidelity. Yellow perch generally moved south along the western shoreline, west along the southern shoreline, and north along the eastern shoreline during summer and non-summer months; the magnitude of movement was greater after spawning. Spawning yellow perch frequently returned to the same site, with 35%–80% of recaptured individuals returning to their marking site. Results from multiple tagging sites within Illinois indicated that spawners may return to larger areas rather than to specific sites, suggesting that large spawning complexes exist. Despite strong fidelity in some areas, straying was evident from all sites during spawning, resulting in mixing throughout the southern basin. Such mixing could promote gene flow and diminish stock differentiation. Dispersal of yellow perch within the southern basin of Lake Michigan occurred regularly across adjacent management boundaries. Therefore, adjacent jurisdictions may wish to consider re-examining their regulations based on this information to ensure consistent, complementary regulations that incorporate the movement patterns of yellow perch.

scholarly journals Biological Utilization and Regeneration of Silicon in Lake Michigan

1977 ◽  
Vol 34 (4) ◽  
pp. 537-544 ◽  
Author(s):  
H. L. Conway ◽  
J. I. Parker ◽  
E. M. Yaguchi ◽  
D. L. Mellinger
Keyword(s):  
Phytoplankton Community ◽  
Lake Michigan ◽  
Early Summer ◽  
Biologically Active ◽  
Soluble Form ◽  
Diatom Community ◽  
Southern Basin ◽  
Depth Profiles ◽  
Dissolved Silicon ◽  
Particulate Silicon

Depth profiles of dissolved reactive silicon and amorphous particulate silicon were made at monthly intervals (April–November 1975) at stations along a southwest transect from Grand Haven, Michigan, to a point approximately in the center of the southern basin of Lake Michigan Biological utilization of reactive silicon occurred prior to stratification in late May or early June. A shift from a 100% diatom-dominated phytoplankton community in spring to ~ 12% diatoms in August was attributed to the low dissolved silicon values observed in the surface water (< 2 μmol/ℓ) during summer. The total amount of biologically active silicon (TBAS) for the lake was found to be approximately 19 μmol/ℓ. Winter values were ~ 2 mol/ℓ amorphous silicon and ~ 17 μmol/ℓ reactive silicon. During the period June–August 80% of TBAS had been utilized by the diatom community, with only 20% remaining as reactive silicon. Greater than 50% of TBAS was lost from the water column during spring and early summer, which was attributed to settling of diatom frustules and the sinking of zooplankton fecal pellets containing frustules. This silicon was subsequently returned, in a soluble form, to the deep water during the fall. The amount of TBAS that was recycled was estimated to be 80–100%. Key words: Lake Michigan, diatoms, recycling, dissolution, limitation, silicon

Temporal and Seasonal Trends in Nutrient Dynamics and Biomass Measures in Lakes Michigan and Ontario in Response to Phosphorus Control

1994 ◽  
Vol 51 (11) ◽  
pp. 2570-2578 ◽  
Author(s):  
T. H. Johengen ◽  
Ora E. Johannsson ◽  
G. Laird Pernie ◽  
E. S. Millard
Keyword(s):  
Nutrient Dynamics ◽  
Lake Michigan ◽  
Lake Ontario ◽  
Ecological Monitoring ◽  
Nutrient Utilization ◽  
Utilization Rate ◽  
Southern Basin ◽  
Utilization Patterns ◽  
Phosphorus Loads

Results from long-term ecological monitoring studies on Lake Michigan (1983–92) and Lake Ontario (1981–92) were compared with regard to changes in phosphorus loads. In Lake Ontario, total phosphorus (TP) loads decreased from 14 000 t∙yr−1 in 1970 to 7500 t∙yr−1 in 1981, and correspondingly, midlake TP concentration decreased from 25 to 16 μg∙L−1 From 1981 to 1991 TP loads remained around 7500 t∙yr−1; however, TP concentration continued to decline from 16 to 10 μg∙L−1. Similarly, mean summer particulate organic carbon (POC), chlorophyll a (CHLa), and nitrate utilization rate decreased by approximately 40, 20, and 50%, respectively. Conversely, silica utilization rates increased markedly after 1983. In Lake Michigan, TP loads also decreased by around 50% from 1974 to 1990 (2000 t∙yr−1); however, TP concentrations at our 100-m station in the southern basin increased during the study period from around 4 to 8 μg∙L−1 There were no distinct trends in CHLa or nutrient utilization patterns; however, POC levels decreased sharply after 1987. Overall, silica utilization rates in Lake Michigan were 50% higher than in Lake Ontario (14.7 vs. 9.6 μg∙L−1∙d−1), whereas nitrate utilization rates were only half (1.4 vs. 4.1 μg∙L−1∙d−1).

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