Trace elements in lesser scaup (Aythya affinis) from the Mississippi flyway.

Nutrient Reserves of Lesser Scaup (Aythya affinis) During Spring Migration in the Mississippi Flyway: A Test of the Spring Condition Hypothesis

Food Habits of Lesser Scaup (Aythya affinis) Occupying Baitfish Aquaculture Facilities in Arkansas

-Lesser scaup Aythya afinis, mediumsized black and white diving ducks, were collected at Arkansas baitfish farms during November-December 1999 (N = 33), January-February 2000 (N = 39), and March-April 2000 (N = 22) to determine seasonal differences in their diet and their relative impact to baitfish production. The mass of gastrointestinal contents was used to determine the proportion of each d...

Hepatic element concentrations of lesser scaup (Aythya affinis) during spring migration in the upper Midwest.

High concentrations of some hepatic elements might be contributing to the decline of the continental lesser scaup (Aythya affinis) population. We evaluated hepatic element concentrations of male and female lesser scaup collected from the upper Midwest (Iowa, Minnesota, North Dakota, and South Dakota) during the 2003 and 2004 spring migrations. We measured concentrations of 24 elements in livers...

Spatiotemporal distributions of intestinal helminths in female lesser scaup Aythya affinis during spring migration from the upper Midwest, USA.

We examined the associations between intestinal helminth infracommunity structure and infection parameters and the age, size, and year and region of collection of 130 female lesser scaup (Aythya affinis) during their 2014-2015 spring migrations through the upper Midwest, USA. We identified a total of 647,174 individual helminths from 40 taxa, including 20 trematodes, 14 cestodes, 4 nematodes an...

Eye Colour, Aging, and Decoy Trap Bias in Lesser Scaup, Aythya affinis

In wildlife studies, individual animals are often sampled and their age, sex, and condition are determined. An implicit assumption of many studies is that different cohorts of a population are equally likely to be encountered relative to that of the wild population at a given time and place. However, true random samples are difficult to collect as some individuals may have an increased probabil...