Effects of Habitat on Mallard Duckling Survival in the Great Lakes Region

2007 ◽  
Vol 71 (6) ◽  
pp. 1885-1891 ◽  
Author(s):  
JOHN W. SIMPSON ◽  
TINA YERKES ◽  
THOMAS D. NUDDS ◽  
BARRY D. SMITH
Keyword(s):  
Great Lakes ◽  
Great Lakes Region ◽  
Duckling Survival ◽  
Mallard Duckling

scholarly journals Mallard Duckling Survival in the Great Lakes Region

The Condor ◽  
2005 ◽  
Vol 107 (4) ◽  
pp. 898-909
Author(s):  
John W. Simpson ◽  
Tina J. Yerkes ◽  
Barry D. Smith ◽  
Thomas D. Nudds
Keyword(s):  
Great Lakes ◽  
Regional Climate ◽  
Survival Rates ◽  
Great Lakes Region ◽  
Hatching Date ◽  
Brood Rearing ◽  
Duckling Survival ◽  
Survival Estimation ◽  
Mallard Duckling ◽  
Study Sites

Abstract Survival of young in waterfowl is poorly understood, particularly in regions outside of the traditional prairie breeding areas. Further, traditional methods of survival estimation lack the ability to statistically characterize between the extremes of random and catastrophic mortality events. We estimated Mallard (Anas platyrhynchos) duckling survival rates for 121 broods at nine study sites across the Great Lakes region from 2001–2003, using a novel statistical method that allows for the partitioning of random and correlated mortality processes. Results indicated that survival increased rapidly with age, did not change with hatching dates, did not differ among years, but varied across site-by-year replicates. Rates of random mortality were found to vary among site-years, while rates of correlated mortality varied little across site-years. In contrast to most studies of Mallard duckling survival, seasonal increases in duckling survival were not detected. We speculate that the observed patterns in survival rates with hatching date are related to productivity in Great Lakes brood-rearing wetlands and temperate regional climate.

MALLARD DUCKLING SURVIVAL IN THE GREAT LAKES REGION

The Condor ◽  
2005 ◽  
Vol 107 (4) ◽  
pp. 898 ◽  
Author(s):  
John W. Simpson ◽  
Tina J. Yerkes ◽  
Barry D. Smith ◽  
Thomas D. Nudds
Keyword(s):  
Great Lakes ◽  
Great Lakes Region ◽  
Duckling Survival ◽  
Mallard Duckling

scholarly journals Lake-to-Lake Cloud Bands: Frequencies and Locations

2007 ◽  
Vol 135 (12) ◽  
pp. 4202-4213 ◽  
Author(s):  
Yarice Rodriguez ◽  
David A. R. Kristovich ◽  
Mark R. Hjelmfelt
Keyword(s):  
High Resolution ◽  
Great Lakes ◽  
Satellite Imagery ◽  
Lake Superior ◽  
Great Lakes Region ◽  
Lake Effect ◽  
Time Period ◽  
High Resolution Satellite Imagery

Abstract Premodification of the atmosphere by upwind lakes is known to influence lake-effect snowstorm intensity and locations over downwind lakes. This study highlights perhaps the most visible manifestation of the link between convection over two or more of the Great Lakes lake-to-lake (L2L) cloud bands. Emphasis is placed on L2L cloud bands observed in high-resolution satellite imagery on 2 December 2003. These L2L cloud bands developed over Lake Superior and were modified as they passed over Lakes Michigan and Erie and intervening land areas. This event is put into a longer-term context through documentation of the frequency with which lake-effect and, particularly, L2L cloud bands occurred over a 5-yr time period over different areas of the Great Lakes region.

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