Hooded merganser

Kuifzaagbek of Kokardezaagbek

Hooded merganser (Lophodytes cucullatus)

De Hooded merganser (Lophodytes cucullatus) is een small duck uit de familie van de water birds that includes ducks, geese, and swans (Anatidae).

Naamgeving

Nederlandse naam:
Kuifzaagbek of Kokardezaagbek
Engelse naam:
Hooded merganser
Duitse naam:
Kappensäger
Franse naam:
Harle couronné
Wetenschappelijke naam:
Lophodytes cucullatus

Taxonomische indeling

Orde:
Anseriformes
Familie:
Anatidae
Onderfamilie:
Merginae
Geslacht:
Lophodytes

Beschrijving

Uiterlijke kenmerken:

Male:
hooded mergansers have a large white crest surrounded by black. The top of the head, neck and back are all black, and the chest, breast and belly are white. Wavy black lines can be seen on the tawny sides and flanks. The hind back, rump and tail are dark brown. The long, narrow, serrated bill is black. The iris is bright yellow and the legs and feet are dull yellow.

Female:
have a gray-brown head and neck with a reddish-brown crest. Gray pervades their neck, chest, sides and flanks, and brownish-black dominates their back, rump and tail. The upper bill is black-edged with orange and the lower bill is yellow. The legs and feet are greenish in color and the iris is brown.

Juvenile:
Juvenile Females: have a gray-brown head and neck with. Gray pervades their neck, chest, sides and flanks, and brownish-black dominates their back, rump and tail. The upper bill is black-edged with orange and the lower bill is yellow. The legs and feet are greenish in color and the iris is brown. Looks like adult Female.

Juvenile Males:
Takes two years for them to get prime adult breeding plumage until then they appear as females with slight appearances and have a gray-brown head and neck with a few black feathers and white feathers threw out head and neck. Gray pervades their neck, chest, sides and flanks, and brownish-black dominates their back, rump and tail. The upper bill is black-edged with orange and the lower bill is yellow. The legs and feet are greenish in color and the iris is brownish Turning Yellow.

Gedrag:

Hooded Mergansers are clumsy, but quick, flyers. They take off by running on water, and they have a ceaseless and rapid wingbeat during flight. They land at high speeds and are often seen ‘skiing’ across the water to come to a stop. They dive well, holding their wings in close to their body and propelling themselves underwater with their feet. 

Maten en Gewicht

Lengte man:
De man (woerd) van de Hooded merganser heeft een lichaamslengte van ongeveer 43-47 centimeters. De vrouw (pop) heeft een lichaamslengte van ongeveer 43-47 centimeters.
Gewicht man:
Het mannetje weegt ongeveer 650 gram. Het vrouwtje weegt ongeveer 550 gram.
Het gewicht is notoir variabel en kan alleen als indicatie worden gebruikt!
Notitie:

Hooded mergansers require a large area of deep (at least 80cm), clear water, with ice-free water maintained in winter. They can be kept in mixed collections but may bully smaller weaker species while nesting. 

Established pairs of these ducks usually breed. Infertility may be a problem, possibly due to males entering, and leaving, breeding condition earlier than females. Several pairs may be maintained in one enclosure, and if maintained in a group collective courting by drakes may be seen. A choice of several raised nest boxes should be provided for nesting, on posts over water, or on the banks, facing the pond and with ramps, 10cm wide, at an angle of 45 degrees, to just below the nest box entrance hole. Box size of 35cm by 30cm by 30cm suggested, with a circular entrance hole, 8cm diameter, close to the top of the box, and soil (5cm deep), peat (2.5cm deep) and a handful of dry grass in the bottom. An alternative design is to use a hollow log, 60-90cm high, provided with a roof and a ramp leading to a 7.5cm entrance hole close to the top; this may be set on a pole for greater height.

These ducks may also lay in boxes used by other species. Eggs are laid mainly April to May, and a second clutch may be laid if the first clutch of eggs is removed. Eggs may be incubated by mallards.

Ducklings are not considered easy to rear; there may be some difficulty in persuading incubator-hatched hand-reared ducklings to feed - livefood such as mealworms are useful to encourage feeding initially. A solitary duckling is unlikely to do well and should be placed with other, similar-sized ducklings. 

N.B. ducklings are very agile and are good climbers; rearing boxes should be covered with wire tops.

May hybridise In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different breeds, varieties, species or genera through sexual reproduction. Hybrids In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different breeds, varieties, species or genera through sexual reproduction. Hybrids are not always intermediates between their parents (such as in blending inheritance), but can show hybrid vigour, sometimes growing larger or taller than either parent. In taxonomy, a key question is how closely related the parent species are. are not always intermediates between their parents (such as in blending inheritance), but can show hybrid vigour, sometimes growing larger or taller than either parent. In taxonomy, a key question is how closely related the parent species are. with other mergansers and other Anatidae The Anatidae are the biological family of water birds that includes ducks, geese, and swans. The family has a cosmopolitan distribution, occurring on all the world's continents. These birds are adapted for swimming, floating on the water surface, and in some cases diving in at least shallow water. The family contains around 146 species in 43 genera. (The magpie goose is no longer considered to be part of the Anatidae and is now placed in its own family, Anseranatidae.) : hybrids reported with Redhead - Aythya americanaCommon goldeneye - Bucephala clangulaCommon merganser - Mergus merganserRed-breasted merganser - Mergus serrator, Wood Duck (Aix Sponsa).

Breeding:
Het vrouwtje Hooded merganser legt doorgaans zo'n 7-15 Shiny white eieren het broeden duurt 28-30 dagen.

Kunstmatig broeden:

De ideale relatieve luchtvochtigheid voor het uitbroeden van de meeste watervogeleieren is 55% voor grondbroeders en 40% bij holenbroeders. De temperatuur is meestal 37,4° C. Stel ventilatie in zoals aanbevolen door de fabrikant van de broedmachine. Eieren moeten minimaal 4 keer per dag automatisch of met de hand worden gedraaid. Naarmate de vrucht zich ontwikkelt, verliest het ei water en wordt de luchtzak groter. Bij normale ontwikkeling van een ei met een incubatietijd van 28-30 dagen neemt de luchtzak ongeveer een derde van het ei in beslag, dit bij drie dagen voor uitkomst. Reinheid is van vitaal belang en idealiter moet de luchtvochtigheid worden verhoogd tot 65% nadat de eerste tekenen van uitkomst zichtbaar worden.


Ringdagen:
Aanbevolen passende ringmaat voor de Hooded merganser is 9 mm.
De gesloten pootring kan alleen aangebracht worden bij een jonge small duck van ongeveer 11 dagen oud.

It doesn't matter what leg that you band, but it's good to have a consistent system.
Suggested: Left leg = Female, Right leg = Male
Onderhoudsvoeder:
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Foto's van de Hooded merganser

Video's van de Hooded merganser