A Hierarchical Model for Regional Analysis of Population Change Using Christmas Bird Count Data, with Application to the American Black Duck

The Condor ◽  
2006 ◽  
Vol 108 (1) ◽  
pp. 13 ◽  
Author(s):  
William A. Link ◽  
John R. Sauer ◽  
Daniel K. Niven
Keyword(s):  
Hierarchical Model ◽  
Count Data ◽  
Population Change ◽  
Regional Analysis ◽  
Christmas Bird Count ◽  
Black Duck ◽  
American Black ◽  
American Black Duck

scholarly journals A Hierarchical Model for Regional Analysis of Population Change Using Christmas Bird Count Data, with Application to the American Black Duck

The Condor ◽  
2006 ◽  
Vol 108 (1) ◽  
pp. 13-24 ◽  
Author(s):  
William A. Link ◽  
John R. Sauer ◽  
Daniel K. Niven
Keyword(s):  
Hierarchical Model ◽  
Population Change ◽  
Regional Analysis ◽  
The United States ◽  
Regional Patterns ◽  
Monte Carlo Techniques ◽  
Christmas Bird Count ◽  
Black Duck ◽  
American Black ◽  
American Black Duck

Abstract Analysis of Christmas Bird Count (CBC) data is complicated by the need to account for variation in effort on counts and to provide summaries over large geographic regions. We describe a hierarchical model for analysis of population change using CBC data that addresses these needs. The effect of effort is modeled parametrically, with parameter values varying among strata as identically distributed random effects. Year and site effects are modeled hierarchically, accommodating large regional variation in number of samples and precision of estimates. The resulting model is complex, but a Bayesian analysis can be conducted using Markov chain Monte Carlo techniques. We analyze CBC data for American Black Ducks (Anas rubripes), a species of considerable management interest that has historically been monitored using winter surveys. Over the interval 1966–2003, Black Duck populations showed distinct regional patterns of population change. The patterns shown by CBC data are similar to those shown by the Midwinter Waterfowl Inventory for the United States.

American Black Duck (Anas rubripes)

2000 ◽  
Author(s):  
Jerry R. Longcore ◽  
Daniel G. McAuley ◽  
Gary R. Hepp ◽  
Judith M. Rhymer
Keyword(s):  
Anas Rubripes ◽  
Black Duck ◽  
American Black ◽  
American Black Duck

American Black Duck (Anas rubripes)

2000 ◽  
Author(s):  
Jerry R. Longcore ◽  
Daniel G. McAuley ◽  
Gary R. Hepp ◽  
Judith M. Rhymer
Keyword(s):  
Anas Rubripes ◽  
Black Duck ◽  
American Black ◽  
American Black Duck

True metabolizable energy of American black duck foods

2015 ◽  
Vol 79 (2) ◽  
pp. 344-348 ◽  
Author(s):  
John M. Coluccy ◽  
Michael V. Castelli ◽  
Paul M. Castelli ◽  
John W. Simpson ◽  
Scott R. Mcwilliams ◽  
...  
Keyword(s):  
Metabolizable Energy ◽  
Black Duck ◽  
American Black ◽  
American Black Duck

Effects of the blood parasite Leucocytozoon simondi on growth rates of anatid ducklings

1999 ◽  
Vol 77 (10) ◽  
pp. 1573-1578 ◽  
Author(s):  
Dave Shutler ◽  
C Davison Ankney ◽  
Adele Mullie
Keyword(s):  
Growth Rates ◽  
Slow Growth ◽  
Principal Component ◽  
Blood Parasite ◽  
Wild Stock ◽  
Wild Duck ◽  
Black Duck ◽  
Size Growth ◽  
American Black ◽  
American Black Duck

The blood parasite Leucocytozoon simondi is often associated with heavy mortality of ducks and geese, especially domestic ones, in North America. In contrast, in a previous study we found no mortality from L. simondi in our wild stock of mallard (Anas platyrhynchos) and American black duck (Anas rubripes) ducklings. However, because parasites can slow growth, which could extend the interval during which ducklings are susceptible to predators, we tested for parasite effects on growth rates. We analysed growth rates over the first 20 days of life, based on tarsus length, culmen, bill width, body mass, and a principal component of structural size. Growth rates of infected ducklings were not lower than those of uninfected ducklings. Similarly, more intense infections did not have a greater effect on growth rates. Hence, growth rates were not negatively affected by L. simondi, which suggests that effects of this parasite on wild duck populations have been overestimated.

Effects of a carbaryl-induced depression in invertebrate abundance on the growth and behavior of American black duck and mallard ducklings

1984 ◽  
Vol 62 (3) ◽  
pp. 452-456 ◽  
Author(s):  
Malcolm L. Hunter Jr. ◽  
Jack W. Witham ◽  
Hilary Dow
Keyword(s):  
Active Ingredient ◽  
Growth Rates ◽  
Anas Platyrhynchos ◽  
Anas Rubripes ◽  
Black Duck ◽  
Invertebrate Abundance ◽  
American Black ◽  
American Black Duck ◽  
And Behavior ◽  
Rate Of Movement

Aerially spraying ponds with carbaryl (Sevin-4-oilR) at 840 g active ingredient/ha reduced biomass and numbers of macroinvertebrates and decreased the growth rates of American black duck, Anas rubripes, and mallard. Anas platyrhynchos, ducklings in Maine. Ducklings on sprayed ponds spent more time searching for food and less time resting, and their rate of movement around the ponds was greater than for ducklings on unsprayed ponds.

American Black Duck and Mallard Breeding Distribution and Habitat Relationships along a Forest–Agriculture Gradient in Southern Québec

2006 ◽  
Vol 70 (2) ◽  
pp. 450-459 ◽  
Author(s):  
CHARLES MAISONNEUVE ◽  
LUC BÉLANGER ◽  
DANIEL BORDAGE ◽  
BENOÎT JOBIN ◽  
MARCELLE GRENIER ◽  
...  
Keyword(s):  
Black Duck ◽  
Breeding Distribution ◽  
American Black ◽  
American Black Duck
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