scholarly journals Shining a light on Laurentian Great Lakes cisco (Coregonus artedi): How ice coverage may impact embryonic development☆

2021 ◽  
Author(s):  
Taylor R. Stewart ◽  
Mark R. Vinson ◽  
Jason D. Stockwell
Keyword(s):  
Embryonic Development ◽  
Great Lakes ◽  
Laurentian Great Lakes ◽  
Ice Coverage ◽  
Coregonus Artedi

scholarly journals Shining a light on Laurentian Great Lakes cisco (Coregonus artedi): how ice coverage may impact embryonic development

2021 ◽  
Author(s):  
Taylor R Stewart ◽  
Mark R Vinson ◽  
Jason D Stockwell
Keyword(s):  
Light Intensity ◽  
Great Lakes ◽  
Light Exposure ◽  
Lake Superior ◽  
Lake Ontario ◽  
Yolk Sac ◽  
Laurentian Great Lakes ◽  
Embryo Survival ◽  
Ice Coverage ◽  
Coregonus Artedi

Changes in winter conditions, such as decreased ice coverage and duration, have been observed in the Laurentian Great Lakes over the past 20+ years and hypothetically linked to low Coregonus spp. survival to age-1. Most cisco (Coregonus artedi) populations are autumn spawners whose embryos incubate under ice throughout the winter. The quantity and quality of light during winter is regulated by ice and snow coverage, and light has been shown to affect embryo survival and development in some teleosts. We experimentally evaluated how cisco embryos from lakes Superior and Ontario responded to three light treatments that represented day-light intensity under 0-10, 40-60, and 90-100% ice coverage. Embryonic response measures included two developmental factors (embryo survival and incubation period) and two morphological traits (length-at-hatch and yolk-sac volume). Embryo survival was highest at the medium light treatment and decreased at high and low treatments for both populations suggesting cisco may be adapted to withstand some light exposure from inter-annual variability in ice coverage. Light intensity had no overall effect on length of incubation. Length-at-hatch decreased with increasing light in Lake Superior, but had no effect in Lake Ontario. Yolk-sac volume was positively correlated with increasing light in Lake Superior and negatively correlated in Lake Ontario. Contrasting responses in embryo development between lakes suggests differences in populations' flexibility to light. These results provide a step towards better understanding the recent high variability observed in coregonine recruitment and may help predict what the future of this species may look like under current climate trends.

scholarly journals How Many Ciscoes are Needed for Stocking in the Laurentian Great Lakes?

2021 ◽  
Author(s):  
Benjamin Rook ◽  
Michael J. Hansen ◽  
Charles R. Bronte
Keyword(s):  
Great Lakes ◽  
Lake Michigan ◽  
Lake Superior ◽  
Production Capacity ◽  
Lake Huron ◽  
Laurentian Great Lakes ◽  
Saginaw Bay ◽  
Thunder Bay ◽  
Western Lake ◽  
Coregonus Artedi

Historically, Cisco Coregonus artedi and deepwater ciscoes Coregonus spp. were the most abundant and ecologically important fish species in the Laurentian Great Lakes, but anthropogenic influences caused nearly all populations to collapse by the 1970s. Fishery managers have begun exploring the feasibility of restoring populations throughout the basin, but questions regarding hatchery propagation and stocking remain. We used historical and contemporary stock-recruit parameters previously estimated for Ciscoes in Wisconsin waters of Lake Superior, with estimates of age-1 Cisco rearing habitat (broadly defined as total ha ≤ 80 m depth) and natural mortality, to estimate how many fry (5.5 months post-hatch), fall fingerling (7.5 months post-hatch), and age-1 (at least 12 months post-hatch) hatchery-reared Ciscoes are needed for stocking in the Great Lakes to mimic recruitment rates in Lake Superior, a lake that has undergone some recovery. Estimated stocking densities suggested that basin-wide stocking would require at least 0.641-billion fry, 0.469-billion fall fingerlings, or 0.343-billion age-1 fish for a simultaneous restoration effort targeting historically important Cisco spawning and rearing areas in Lakes Huron, Michigan, Erie, Ontario, and Saint Clair. Numbers required for basin-wide stocking were considerably greater than current or planned coregonine production capacity, thus simultaneous stocking in the Great Lakes is likely not feasible. Provided current habitat conditions do not preclude Cisco restoration, managers could maximize the effectiveness of available production capacity by concentrating stocking efforts in historically important spawning and rearing areas, similar to the current stocking effort in Saginaw Bay, Lake Huron. Other historically important Cisco spawning and rearing areas within each lake (listed in no particular order) include: (1) Thunder Bay in Lake Huron, (2) Green Bay in Lake Michigan, (3) the islands near Sandusky, Ohio, in western Lake Erie, and (4) the area near Hamilton, Ontario, and Bay of Quinte in Lake Ontario. Our study focused entirely on Ciscoes but may provide a framework for describing future stocking needs for deepwater ciscoes.

scholarly journals Evaluation of oxythermal metrics and benchmarks for the protection of cisco (Coregonus artedi) habitat quality and quantity in Wisconsin lakes

2018 ◽  
Vol 75 (4) ◽  
pp. 600-608 ◽  
Author(s):  
John Lyons ◽  
Timothy P. Parks ◽  
Kristi L. Minahan ◽  
Aaron S. Ruesch
Keyword(s):  
Dissolved Oxygen ◽  
Great Lakes ◽  
Water Temperature ◽  
Water Column ◽  
Laurentian Great Lakes ◽  
Great Lakes Region ◽  
Wide Range ◽  
Coregonus Artedi ◽  
Oxygenated Water

The cisco (Coregonus artedi) requires cold, well-oxygenated water and is threatened by climate warming and lake eutrophication, especially at the southern edge of its range in the Laurentian Great Lakes region. In this paper, a method is described to assess the quality, quantity, and variability of suitable cisco habitat. Two metrics are proposed to characterize existing cisco oxythermal habitat in this region: water temperature in the water column at a dissolved oxygen of 6 mg/L (TDO6) and “cisco layer thickness” (CLT), the vertical extent of the water column within which water temperature is ≤22.8 °C and dissolved oxygen is ≥6 mg/L. It is proposed that values of TDO6 = 22.8 °C and CLT = 1 m be used as benchmarks to identify cisco lakes with potentially stressful oxythermal habitat. Long-term summer data from 14 Wisconsin cisco lakes with a wide range of limnological characteristics indicated that TDO6 varied from 4.2 to 27.5 °C and CLT from −6.2 to 66.7 m. Cisco abundance across lakes was greater at lower values of TDO6 and higher values of CLT, and non-attainments of the proposed benchmarks were most likely in lakes with remnant or extirpated cisco populations. Non-attainment of benchmarks could occur from late June through September, and three or more samples across the entire summer would be required to have a reasonable probability of detecting a non-attainment in TDO6 or CLT within any given year. Across years, to detect a single year of non-attainment with an 80% level of confidence, two years of sampling would be sufficient for CLT and three years for TD06; to detect more than one non-attaining year, three years of sampling for CLT and six years of sampling for TD06 would be required. Despite relatively high temporal variation in some lakes, the proposed metrics and benchmarks appear to have value for assessing cisco oxythermal habitat in the Great Lakes region.

Airborne Hyperspectral Imaging of Laurentian Great Lakes: Operational Challenges

2010 ◽  
Author(s):  
John Lekki ◽  
R. Anderson ◽  
Q.-V. Nguyen ◽  
J. Demers ◽  
J. Flatico ◽  
...  
Keyword(s):  
Great Lakes ◽  
Hyperspectral Imaging ◽  
Laurentian Great Lakes

INTERPRETING PALEOHYDROGRAPHIC DATA RECONSTRUCTED FROM STRANDPLAINS OF BEACH RIDGES IN THE LAURENTIAN GREAT LAKES

2017 ◽  
Author(s):  
John W. Johnston ◽  
◽  
Erin P. Argyilan ◽  
Steve J. Baedke ◽  
Sean Morrison ◽  
...  
Keyword(s):  
Great Lakes ◽  
Laurentian Great Lakes ◽  
Beach Ridges

Potential Effects of Bigheaded Carps on Four Laurentian Great Lakes Food Webs

2021 ◽  
Author(s):  
Edward S. Rutherford ◽  
Hongyan Zhang ◽  
Yu‐Chun Kao ◽  
Doran M. Mason ◽  
Ali Shakoor ◽  
...  
Keyword(s):  
Great Lakes ◽  
Food Webs ◽  
Laurentian Great Lakes

Long-term primary production trends in the Laurentian Great Lakes: a comparison of geochemical methods

2021 ◽  
Author(s):  
Euan D. Reavie ◽  
Meijun Cai ◽  
Carsten Meyer-Jacob ◽  
John P. Smol ◽  
Josef P. Werne
Keyword(s):  
Primary Production ◽  
Great Lakes ◽  
Laurentian Great Lakes

scholarly journals On the role of local depth and latitude on surface warming heterogeneity in the Laurentian Great Lakes

Inland Waters ◽  
2021 ◽  
pp. 1-15
Author(s):  
Elisa Calamita ◽  
Sebastiano Piccolroaz ◽  
Bruno Majone ◽  
Marco Toffolon
Keyword(s):  
Great Lakes ◽  
Laurentian Great Lakes ◽  
Surface Warming ◽  
Local Depth
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