Harlequin Duck at Saskatoon

Saskatoon By

Two factors presumed to affect the behavioural response of cattle (Bos taurus) to artificial weaning were investigated: the termination of nursing, and the physical separation of cows and calves. A two-stage process was used to disconnect these traditionally linked components. First, the behaviour of cows and calves was quantified in response to preventing nursing by having calves wear an antis...

Harlequin Duck population injury and recovery dynamics following the 1989 Exxon Valdez oil spill.

The 1989 Exxon Valdez oil spill caused significant injury to wildlife populations in Prince William Sound, Alaska, USA. Harlequin Ducks (Histrionicus histrionicus) were particularly vulnerable to the spill and have been studied extensively since, leading to one of the most thorough considerations of the consequences of a major oil spill ever undertaken. We compiled demographic and survey data c...

Female Harlequin Duck Winter Survival 11 to 14 Years After the Exxon Valdez Oil Spill

In the midto late 1990s, nearly a decade after the 1989 Exxon Valdez oil spill, female harlequin ducks (Histrionicus histrionicus) suffered reduced winter survival in oiled areas of Prince William Sound, Alaska, USA, relative to unoiled areas. We conducted follow-up studies from winters 2000–2001 to 2002–2003 to determine whether differential survival persisted and to evaluate whether individua...

Harlequin ichthyosis (or harlequin fetus)

The pat ient was a female neonate bor n prematurely on 36 weeks of gestation by normal vaginal delivery. During pregnancy, mother had no history of fever, drug use or x-ray exposure. The mother was gravida 2 and had no history of abortion. Her first baby was well. On physical examination, the skin was markedly thickened, hard and hyperkeratotic with deep crevices running transversely and vertic...

Harlequin Syndrome