Seasonal Distribution and Site Tenacity of the Great Lakes Common Tern

Bird-Banding ◽  
1978 ◽  
Vol 49 (2) ◽  
pp. 142 ◽  
Author(s):  
Gerard T. Haymes ◽  
Hans Blokpoel
Keyword(s):  
Great Lakes ◽  
Seasonal Distribution ◽  
Common Tern ◽  
Site Tenacity

Seasonal Distribution and Site Fidelity in Great Lakes Caspian Terns

1988 ◽  
Vol 11 (2) ◽  
pp. 202 ◽  
Author(s):  
Louis L'Arrivee ◽  
Hans Blokpoel
Keyword(s):  
Great Lakes ◽  
Site Fidelity ◽  
Seasonal Distribution ◽  
Caspian Terns

Factors affecting the reproductive success of common tern (Sterna hirundo) colonies on the lower Great Lakes during the summer of 1972

1976 ◽  
Vol 54 (11) ◽  
pp. 1850-1862 ◽  
Author(s):  
Ralph D. Morris ◽  
Rodger A. Hunter ◽  
James F. McElman
Keyword(s):  
Reproductive Success ◽  
Great Lakes ◽  
Clutch Size ◽  
Relative Proportion ◽  
Common Tern ◽  
Sterna Hirundo ◽  
Success Rates ◽  
Factors Affecting ◽  
Fledging Success ◽  
Egg Failure

The breeding biology of five common tern (Sterna hirundo) colonies in the lower Great Lakes was studied between May and August 1972. Frequent visits were made to each colony and data collected on nests within large artificially enclosed areas. The objective was to identify factors that influence the reproductive success of common tern colonies on the Great Lakes. Hatching success was significantly dependent on clutch size and time of clutch initiation, whereas fledging success was independent of clutch size. The most common category of egg failure was disappearance from the nest. One colony (Port Colborne) realized a significantly higher hatching and fledging success than the others, among which there were no significant differences in prehatch or posthatch success rates. Factors that contributed to differences in reproductive success are presented and their relative contributions to the reproductive success of the tern colonies are discussed. The factors include the relative proportion of three-egg clutches, incubation time as a measure of 'parent attentiveness,' numerical size of the colony, predation, competition for nesting sites by gulls, food availability, flooding, and toxic chemicals. We conclude that no single factor can be readily correlated with reproductive success and suggest that caution should be exercised when considering the relationships between reproductive success and factors influencing it.

Vertical and Seasonal Distribution of Chlorophyll a in Lake Michigan

1977 ◽  
Vol 34 (12) ◽  
pp. 2280-2287 ◽  
Author(s):  
Arthur S. Brooks ◽  
Byron G. Torke
Keyword(s):  
Great Lakes ◽  
Chlorophyll A ◽  
Thermal Stratification ◽  
Lake Michigan ◽  
Seasonal Distribution ◽  
Laurentian Great Lakes ◽  
Deep Chlorophyll Maximum ◽  
Phytoplankton Dynamics ◽  
Chain Dynamics ◽  
Offshore Station

Vertical and seasonal distribution of chlorophyll a was observed for 2 yr at an offshore station in Lake Michigan. Chlorophyll a concentrations increased uniformly at all depths during spring reaching 3–4 mg/m3 by late May. Thermal stratification was followed by development of a subthermocline chlorophyll peak between 10 and 30 m that reached 8.5 mg/m3 by late July. The major subthermocline peak collapsed in mid-August but was followed by two lesser peaks at depths of 10 and 30 m. Autumn mixing dispersed these peaks in the mixed layer, increasing the chlorophyll content of the epilimnion at a time when integral chlorophyll levels were declining. At fall overturn chlorophyll concentrations were uniformly distributed at approximately 1 mg/m3, where they remained throughout the winter. The presence of a deep chlorophyll maximum in Lake Michigan adds a new dimension to limnological studies of the Great Lakes. The influence of this peak must be considered in future investigations of food chain dynamics and eutrophication processes in the Great Lakes system. Key words: Laurentian Great Lakes, limnology, chlorophyll a, spatial distribution, phytoplankton dynamics

The Great Lakes

1896 ◽  
Vol 42 (1072supp) ◽  
pp. 17142-17142
Keyword(s):  
Great Lakes

The “Halibut” of the Great Lakes

1886 ◽  
Vol 22 (555supp) ◽  
pp. 8866-8867
Author(s):  
G.Archie Stockwell
Keyword(s):  
Great Lakes
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