Foods of Lesser Scaups on Breeding, Migration, and Wintering Areas

Rogers, John P.; Korschgen, Leroy J.

doi:10.2307/3797811

Cited by 54 publications

(41 citation statements)

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“…First, amphipods historically were the predominate food item consumed by scaup in a variety of locations and years during spring and early summer (Rogers and Korschgen 1966;Bartonek and Hickey 1969;Swanson and Nelson 1970;Swanson and Duebbert 1989;. Second, scaup use of wetlands is positively correlated with amphipod densities (Lindeman and Clark 1999;Strand 2005;Anteau 2006), but not correlated with chironomid densities (Strand 2005;Anteau 2006), another frequently consumed food (this study; Anteau and Afton 2006).…”

Section: Discussion Importance Of Amphipods In Scaup Dietsmentioning

confidence: 97%

“…In the 1960s, aggregate percentages of amphipods in scaup diets, during spring and early summer throughout the Prairie Pothole Region, ranged from 46-67 (Rogers and Korschgen 1966;Bartonek and Hickey 1969;Swanson and Nelson 1970;Swanson and Duebbert 1989). In the 1980s, aggregate percentages of amphipods ranged from 29-33 and aggregate percentages were 94% lower in Northwestern Minnesota in -2001(Anteau and Afton 2006.…”

Section: Discussion Importance Of Amphipods In Scaup Dietsmentioning

confidence: 99%

“…Historically, scaup consumed macroinvertebrates almost exclusively during spring, with amphipods being their predominant prey during spring and summer in the upper-Midwest (Rogers and Korschgen 1966;Bartonek and Hickey 1969;Swanson and Nelson 1970;Swanson and Duebbert 1989;. Use of particular wetlands by scaup in spring and summer is positively correlated with densities of amphipods (Lindeman and Clark 1999;Strand 2005;Anteau 2006).…”

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confidence: 99%

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Diets of Lesser Scaup during Spring Migration throughout the Upper-Midwest are Consistent with the Spring Condition Hypothesis

Anteau

Afton

2008

Waterbirds

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Section: Discussion Importance Of Amphipods In Scaup Dietsmentioning

confidence: 97%

Section: Discussion Importance Of Amphipods In Scaup Dietsmentioning

confidence: 99%

mentioning

confidence: 99%

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Diets of Lesser Scaup during Spring Migration throughout the Upper-Midwest are Consistent with the Spring Condition Hypothesis

Anteau

Afton

2008

Waterbirds

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“…Organic and inorganic materials were separated using a dissecting microscope. Items within a sample were separated according to species of plant or animal.Volumetric measurements were made using a microsyringe (used for small food items and items found in small quantities), 10 ml, or 25 ml graduated cylinders (Rogers and Korschgen 1966). We placed food items into the micro-syringe or graduated cylinder and compressed slightly with a small dowel to remove any air pockets.…”

mentioning

confidence: 99%

“…Number 20 (850 micrometer), number 35 (500 micrometer), and number 140 (106 micrometer) sieves were used to separate food items by size. Samples were processed using the dry volumetric method (Rogers and Korschgen 1966). Each food item was placed in plastic measuring dishes and dried at 55°C for 48 hours in a constant temperature oven.…”

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confidence: 99%

Food Habits of Dabbling Ducks During Fall Migration in a Prairie Pothole System, Heron Lake, Minnesota

2005

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. 2005. Food habits of dabbling ducks during fall migration in a prairie pothole system, Heron Lake, Minnesota. Canadian Field-Naturalist 119(4): 546-550.We conducted an analysis of dabbling duck food habits in the fall of 2002 and 2003 in the Heron Lake system. Gizzard contents of hunter-harvested birds were analyzed using the percent aggregate volume method to determine what food items were consumed and in what quantity. Curltop Ladysthumb (Polygonum lapathifolium) was the food item consumed most often (82.2%) and in the greatest volume (34.2 ml). Sago Pondweed (Stuckenia pectinata) was the only food item of which multiple plant parts were consumed. However, the seeds and tubers only comprised 1.27 and 0.07 of the total aggregate percent.Key Words: Food habits, waterfowl, gizzard contents, aggregate volume, submersed macrophytes, Curltop Ladysthumb, Polygonum lapathifolium, Sago Pondweed, Stuckenia pectinata. WERSAL, MCMILLAR, and MADSEN: FOOD OF DABBLING DUCKS 547 Methods Site DescriptionThe Heron Lake system is located in Jackson County, Minnesota (43.72333 o N 95.2325 o W) and comprises four lakes; of which South Heron and North Heron Lakes were used in this study. The four lakes have a mean depth of less than 1.5 m and a combined surface area of approximately 3200 hectares. South Heron Lake (1220 ha) can be divided into a north bay and a south bay by differing sediment characteristics (Case and Madsen 2004). South Heron Lake is connected to North Heron Lake via Division Creek located in the northern most part of the lake. North Heron Lake (1350 ha) is a flat, shallow lake with little change in depth from one end to the other. North Marsh (430 ha) is a small shallow water body located at the northern edge of North Heron Lake. Birds harvested on North Marsh were included in North Heron Lake due the close proximity of the lakes. Duck Lake (190 ha) was not included in this study due to the lack of public access for hunters. Food Habit CollectionHunters from South Heron and North Heron Lakes (including North Marsh) were asked to collect the gizzards from their harvested birds during each hunting day in 2002 and 2003. The harvested samples were placed in 1.06-l Whirl-pak bags filled with a 75% ethyl alcohol solution. A waterproof label was affixed to each bag to record the lake, the species and sex of the bird, and the date of harvest. The collected samples were stored in a refrigerator at approximately 4 o C until processing.In the lab, each gizzard was opened and its contents washed through a series of standard testing sieves. Number 20 (850 micrometer), number 35 (500 micrometer), and number 140 (106 micrometer) sieves were used to separate food items by size. Samples were processed using the dry volumetric method (Rogers and Korschgen 1966). Each food item was placed in plastic measuring dishes and dried at 55°C for 48 hours in a constant temperature oven. We summarized food items by species of waterfowl. Organic and inorganic materials were separated using a dissecting microscope. Items within a sample w...

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Riding the wetland wave: Can ducks locate macroinvertebrate resources across the breeding season?

Setash,

Behney,

Gammonley

et al. 2024

Ecology and Evolution

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Food availability varies considerably over space and time in wetland systems, and consumers must be able to track those changes during energetically‐demanding points in the life cycle like breeding. Resource tracking has been studied frequently among herbivores, but receives less attention among consumers of macroinvertebrates. We evaluated the change in resource availability across habitat types and time and the simultaneous density of waterfowl consumers throughout their breeding season in a high‐elevation, flood‐irrigated system. We also assessed whether the macroinvertebrate resource density better predicted waterfowl density across habitats, compared to consistency (i.e., temporal evenness) of the invertebrate resource or taxonomic richness. Resource density varied marginally across wetland types but was highest in basin wetlands (i.e., ponds) and peaked early in the breeding season, whereas it remained relatively low and stable in other wetland habitats. Breeding duck density was positively related to resource density, more so than temporal resource stability, for all species. Resource density was negatively related to duckling density, however. These results have the potential to not only elucidate mechanisms of habitat selection among breeding ducks in flood‐irrigated landscapes but also suggest there is not a consequential trade‐off to selecting wetland sites based on energy density versus temporal resource stability and that good‐quality wetland sites provide both.

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Foods of Lesser Scaups on Breeding, Migration, and Wintering Areas

Cited by 54 publications

References 3 publications

Diets of Lesser Scaup during Spring Migration throughout the Upper-Midwest are Consistent with the Spring Condition Hypothesis

Diets of Lesser Scaup during Spring Migration throughout the Upper-Midwest are Consistent with the Spring Condition Hypothesis

Food Habits of Dabbling Ducks During Fall Migration in a Prairie Pothole System, Heron Lake, Minnesota

Riding the wetland wave: Can ducks locate macroinvertebrate resources across the breeding season?

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