Spectrographic analysis of the Greeting Call of the Night Heron (Nycticorax nycticorax nycticorax)

1993 ◽  
Vol 5 (3) ◽  
pp. 382-383
Author(s):  
A. Bari ◽  
S. Camanni ◽  
P. Gonella ◽  
R. Piazza ◽  
G. Tallone ◽  
...  
Keyword(s):  
Spectrographic Analysis ◽  
Nycticorax Nycticorax ◽  
Night Heron

The effects of bird predation on an estuarine stickleback (Pisces: Gasterosteidae) community

1985 ◽  
Vol 63 (2) ◽  
pp. 301-307 ◽  
Author(s):  
F. G. Whoriskey ◽  
G. J. Fitzgerald
Keyword(s):  
Fish Community ◽  
Gasterosteus Aculeatus ◽  
Selective Predation ◽  
Bird Predation ◽  
Lawrence Estuary ◽  
Nycticorax Nycticorax ◽  
Larus Delawarensis ◽  
Night Heron ◽  
Marsh Pools ◽  
St Lawrence Estuary

Eight species of birds fed on a community of sticklebacks living in salt marsh pools along the southern shore of the St. Lawrence estuary in May and June when the fish breed. Three birds, the black-crowned night heron (Nycticorax nycticorax), the bronzed grackle (Quiscalus quiscula), and the ring-billed gull (Larus delawarensis) accounted for 80% of the estimated captures. Bird predation removed about 30% of the sticklebacks in the marsh. Significantly more male than female Gasterosteus aculeatus and G. wheatlandi were eaten, indicating selective predation is playing a role in structuring this fish community.

scholarly journals Black-crowned Night-Heronsof the Lake Calumet Region,Chicago, Illinois

2005 ◽  
Vol 37 (1-6) ◽  
pp. 109-117 ◽  
Author(s):  
Walter J. Marcisz ◽  
Jeffrey M. Levengood ◽  
Allison M. Klement ◽  
Margaret A. Kurcz
Keyword(s):  
Habitat Loss ◽  
Environmental Contaminants ◽  
Past Century ◽  
Nycticorax Nycticorax ◽  
The Past ◽  
Nest Sites ◽  
Night Heron ◽  
Lake Calumet ◽  
Recent Trends

The number of active black-crowned night-heron (Nycticorax nycticorax) nesting colonies in Illinois has declined significantly over the past century. Habitat loss/degradation and other factors such as exposure to environmental contaminants and competition for nest sites at established colonies may have contributed to this decline. In this study, we examined recent trends in population levels of Black-crowned Night-Herons nesting at wetlands associated with Lake Calumet in southeastern Chicago, Illinois. The number of black-crowned night herons nesting annually at these wetlands has fluctuated widely over the last two decades. Immigration of herons from riverine colonies may have driven population increases during the mid-1980s and early 1990s. However, this population has remained relatively stable at between 300 and 400 pairs during 1997–2003.

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