Nutrient Reserves of Lesser Scaup (Aythya affinis) During Spring Migration in the Mississippi Flyway: A Test of the Spring Condition Hypothesis
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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...
متن کاملHepatic 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...
متن کاملDiets of Lesser Scaup during Spring Migration throughout the Upper-Midwest are Consistent with the Spring Condition Hypothesis
— The spring condition hypothesis (SCH) states that the current decline of the North American scaup population (Lesser [ Aythya affinis ] and Greater Scaup [ A. marila ] combined) is due to a decline in quality or availability of scaup foods on wintering, spring migration, or breeding areas that has caused a reduction in female body condition and subsequent reproductive success. Our previous re...
متن کاملNutrieNt-reserve DyNamics DuriNg egg ProDuctioN by Female greater scauP (AythyA mArilA ): relatioNshiPs with timiNg oF reProDuctioN
—We studied nutrient-reserve dynamics of female Greater Scaup (Aythya marila) to quantify intraspecific strategies of nutrient acquisition for egg production, particularly in relation to the seasonal timing of reproduction (i.e., date of initiation of rapid follicle growth [RFG]). We collected female Greater Scaup on the Yukon-Kuskokwim Delta, Alaska, from arrival through clutch formation durin...
متن کاملTrace elements in lesser scaup (Aythya affinis) from the Mississippi flyway.
Previous research reported that concentrations of selenium in the livers of 88-95% of lesser scaup from locations in Lake Erie, Lake St. Clair, and Lake Michigan, USA were either elevated (10-33 microg/g dry weight [dw]) or in the potentially harmful range (> 33 microg/g dw). In order to determine the geographic extent of these high selenium concentrations, we collected lesser scaup in Louisian...
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