scholarly journals Sexually dichromatic hybrids between two monochromatic duck species, the Chiloé wigeon and the Philippine duck

2021 ◽  
Author(s):  
Jente Ottenburghs ◽  
Jan Harteman
Keyword(s):  
Duck Species

scholarly journals Heavy metal concentrations in the liver of two wild duck species: influence of species and gender

2009 ◽  
Vol 8 (sup3) ◽  
pp. 222-224 ◽  
Author(s):  
Tihomir Florijančić ◽  
Anđelko Opačak ◽  
Ivica BoŠković ◽  
Dinko Jelkić ◽  
SiniŠa Ozimec ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Concentrations ◽  
Wild Duck ◽  
Heavy Metal Concentrations ◽  
Duck Species ◽  
And Gender

scholarly journals Year-round spatiotemporal distribution pattern of a threatened sea duck species breeding on Kolguev Island, south-eastern Barents Sea

BMC Ecology ◽  
2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Thiemo Karwinkel ◽  
Ingrid L. Pollet ◽  
Sandra Vardeh ◽  
Helmut Kruckenberg ◽  
Petr Glazov ◽  
...  
Keyword(s):  
Distribution Pattern ◽  
Barents Sea ◽  
Spatiotemporal Distribution ◽  
South Eastern ◽  
Duck Species ◽  
Sea Duck ◽  
Kolguev Island

scholarly journals Wetland selection, niche breadth and overlap in 10 duck species wintering in northern Campania (Italy)

2018 ◽  
Vol 87 (2) ◽  
pp. 3-8
Author(s):  
Stefano Giustino ◽  
Marcello Bruschini ◽  
Elio Esse ◽  
Silvana Grimaldi ◽  
Danila Mastronardi ◽  
...  
Keyword(s):  
Niche Breadth ◽  
Selection Index ◽  
Niche Overlap ◽  
Campania Region ◽  
Duck Species ◽  
Wintering Area ◽  
Morisita Index ◽  
Species Preferences

Analysis of the selection index, the niche breadth and the niche overlap of 10 species of wintering ducks in 11 wetland areas of the Campania region between January 2003 and 2015 revealed that the distribution of the species in the examined sites was not casual. In fact, each species actively chose their wintering area. Using selection index, we were able to measure the species’ preferences and non-preferences for the 11 examined sites. By calculating Shannon-Wiener entropy and its normalized value (Evenness), we determined niche breadth; the Morisita index allowed us to check niche overlap.

Liver gene expression in relation to hepatic steatosis and lipid secretion in two duck species

2010 ◽  
Vol 41 (1) ◽  
pp. 12-20 ◽  
Author(s):  
F. Hérault ◽  
G. Saez ◽  
E. Robert ◽  
A. Al Mohammad ◽  
S. Davail ◽  
...  
Keyword(s):  
Gene Expression ◽  
Hepatic Steatosis ◽  
Lipid Secretion ◽  
Duck Species ◽  
Liver Gene

scholarly journals Multiple losses of flight and recent speciation in steamer ducks

2012 ◽  
Vol 279 (1737) ◽  
pp. 2339-2346 ◽  
Author(s):  
Tara L. Fulton ◽  
Brandon Letts ◽  
Beth Shapiro
Keyword(s):  
Common Ancestor ◽  
Falkland Islands ◽  
Land Bridge ◽  
Separate Species ◽  
Duck Species ◽  
Traditional Classification ◽  
Distinct Lineage ◽  
Insular Population ◽  
Glacial Advance

Steamer ducks ( Tachyeres ) comprise four species, three of which are flightless. The flightless species are believed to have diverged from a flying common ancestor during the Late Pleistocene; however, their taxonomy remains contentious. Of particular interest is the previously unstudied population of flying steamer ducks in the Falkland Islands. We present the first genetic data from this insular population, and illustrate that the flying and flightless steamer ducks on the Falkland Islands are genetically indistinguishable, in contrast to their traditional classification as separate species. The three species that reside in continental South America form a genetically distinct lineage from the Falkland Island ducks. The Falkland steamer ducks diverged from their continental relatives 2.2–0.6 million years ago, coincident with a probable land bridge connecting the Falkland Islands to the mainland. The three continental species share a common ancestor approximately 15 000 years ago, possibly owing to isolation during a recent glacial advance. The continental steamer duck species are not reciprocally monophyletic, but show some amount of genetic differentiation between them. Each lineage of Tachyeres represents a different stage between flight and flightlessness. Their phylogenetic relationships suggest multiple losses of flight and/or long-term persistence of mixed-flight capability. As such, steamer ducks may provide a model system to study the evolution of flightlessness.

THE FOOD OF SOME DUCK SPECIES OCCURRING AT LAKE CHILWA, MALAWI

Ostrich ◽  
1974 ◽  
Vol 45 (4) ◽  
pp. 224-226 ◽  
Author(s):  
G. G. M. Schulten
Keyword(s):  
Duck Species ◽  
Lake Chilwa

scholarly journals It is time to move: linking flight and foraging behaviour in a diving bird

2007 ◽  
Vol 3 (4) ◽  
pp. 357-359 ◽  
Author(s):  
David Pelletier ◽  
Magella Guillemette ◽  
Jean-Marc Grandbois ◽  
Patrick J Butler
Keyword(s):  
Permutation Test ◽  
Dynamic Environment ◽  
The Body ◽  
Somateria Mollissima ◽  
Data Logger ◽  
Body Angle ◽  
Diving Depth ◽  
Adaptive Value ◽  
Duck Species ◽  
Diving Bird

Although the adaptive value of flight may seem obvious, it is the most difficult behaviour of birds to monitor. Here, we describe a technique to quantify the frequency and the duration of flights over several months by implanting a data logger that records heart rate ( f H ), hydrostatic pressure (diving depth) and the body angle of a large sea duck species, the common eider ( Somateria mollissima ). According to the mean f H recorded during flight and the parameters recorded to identify the f H flight signature, we were able to identify all flights performed by 13 individuals during eight months. We cumulated local flight time (outside migrations) and found that activity occurs primarily during dawn and morning and that flying activities are strongly related to diving activities (Pearson's r =0.88, permutation test p <0.001). This relationship was interpreted as a consequence of living in a dynamic environment where sea currents move the ducks away from the food patches. We believe that the technique described here will open new avenues of investigation in the adaptive value of flight.

Timing of nesting of upland-nesting ducks in the Canadian prairies and its relation to spring wetland conditions

2016 ◽  
Vol 94 (8) ◽  
pp. 575-581 ◽  
Author(s):  
A.J. Raquel ◽  
J.H. Devries ◽  
D.W. Howerter ◽  
R.T. Alisauskas ◽  
S.W. Leach ◽  
...  
Keyword(s):  
Habitat Quality ◽  
Canadian Prairie ◽  
Canadian Prairies ◽  
Anas Crecca ◽  
Lesser Scaup ◽  
Duck Species ◽  
Anas Clypeata ◽  
Nesting Patterns ◽  
Anas Strepera ◽  
Species Being

Timing of breeding varies among waterfowl species and individuals, with strong effects on reproductive success, and may be related to habitat quality. Here, we analyse the start, span, and end of the nesting season for nine upland-nesting duck species at 166 Canadian Prairie–Parkland sites over 34 years to better characterize nesting patterns and test whether and how species respond to May pond abundances. Nesting metrics were compared between single-site versus multiple-site studies over 7 years to evaluate the effects of spatial scale and methodology. Strong, consistent differences in start of nesting were found among duck species, being earliest for Northern Pintail (Anas acuta L., 1758) and Mallard (Anas platyrhynchos L., 1758), followed by Northern Shoveler (Anas clypeata L., 1758), American Green-winged Teal (Anas crecca carolinensis Gmelin, 1789 = Anas carolinensis Gmelin, 1789), Blue-winged Teal (Anas discors L., 1766), American Wigeon (Anas americana Gmelin, 1789), Gadwall (Anas strepera L., 1758), and lastly by Lesser Scaup (Aythya affinis (Eyton, 1838)) and White-winged Scoter (Melanitta fusca deglandi (Bonaparte, 1850)). Span and end of nesting were related to May pond abundances, but the strength of these relationships varied among species, presumably reflecting the flexible (re-)nesting potential of individuals of some species in response to wetland-habitat quality.

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