Temporal distribution of waterfowl in eastern South Dakota: Implications for aerial surveys

Naugle, David E.; Johnson, Rex R.; Cooper, Thomas R.; Holland, Matthew M.; Higgins, Kenneth F.

doi:10.1672/0277-5212(2000)020[0177:tdowie]2.0.co;2

Cited by 20 publications

(31 citation statements)

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“…The 2 scaup species were combined because of difficulties in separating them during aerial surveys. Survey design and methodology were described in detail by Canadian Wildlife Service (CWS) and USFWS (1987), Grier (1988), Smith (1995), Hodges et al (1996), andNaugle et al (2000).…”

Section: Waterfowl Breeding Population and Habitat Surveysmentioning

confidence: 99%

“…The breeding population survey was conducted from 1-25 May in prairie strata and from 12 May to 12 June in boreal forest areas (Smith 1995 tion); consequently, the potential is high for errors in estimating both distribution and numbers of breeding scaup. Depending on timing of surveys and scaup migration chronology (both of which are influenced by spring weather conditions), the probability of multiple counting of the same individuals is high when scaup and survey crews move north at the same time (see also Crissey 1975:20;Austin et al 1998Austin et al , 2001Naugle et al 2000). Anecdotal observations and some quantitative data (Naugle et al 2000) suggest that overestimation of the scaup population was a major problem in some years.…”

Section: Survey Biasesmentioning

confidence: 99%

“…Depending on timing of surveys and scaup migration chronology (both of which are influenced by spring weather conditions), the probability of multiple counting of the same individuals is high when scaup and survey crews move north at the same time (see also Crissey 1975:20;Austin et al 1998Austin et al , 2001Naugle et al 2000). Anecdotal observations and some quantitative data (Naugle et al 2000) suggest that overestimation of the scaup population was a major problem in some years. For example, observations on a marked population of lesser scaup breeding near Erickson, Manitoba (Afton 1983(Afton , 1984, indicated that large numbers (10-20 times the resident population) of unmarked migrants were present when USFWS transects in the area were flown in 1979.…”

Section: Survey Biasesmentioning

confidence: 99%

See 2 more Smart Citations

Declining Scaup Populations: A Retrospective Analysis of Long-Term Population and Harvest Survey Data

Afton¹,

Anderson²

2001

The Journal of Wildlife Management

107

146

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Section: Waterfowl Breeding Population and Habitat Surveysmentioning

confidence: 99%

Section: Survey Biasesmentioning

confidence: 99%

Section: Survey Biasesmentioning

confidence: 99%

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Declining Scaup Populations: A Retrospective Analysis of Long-Term Population and Harvest Survey Data

Afton¹,

Anderson²

2001

The Journal of Wildlife Management

107

146

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“…Wetlands of eastern South Dakota provide important feeding areas for spring-migrating lesser scaup (Naugle et al, 2000). Lesser scaup prefer large, semipermanent wetland basins with relatively high invertebrate abundance (Lindeman & Clark, 1999;Strand, 2005;Anteau, 2006).…”

Section: Introductionmentioning

confidence: 99%

Patterns of prey use by lesser scaup Aythya affinis (Aves) and diet overlap with fishes during spring migration

et al. 2007

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Recent decline in the lesser scaup Aythya affinis population has been linked to changes in wetland conditions along their spring migration routes. In particular, the use of amphipod prey by lesser scaup has declined in many regions of the upper Midwest U.S.A. and has been linked to expanded fisheries, although empirical data on diet overlap are lacking. To explore patterns of prey use by lesser scaup and diet overlap with fishes, we quantified diets of scaup and fishes during the 2003 and 2004 spring migration in eastern South Dakota, U.S.A. We compared diet overlap between lesser scaup and fishes collected from Twin Lakes, South Dakota-an important stopover location for springmigrating scaup. Plant seeds occurred in [95% of lesser scaup diets (n = 118) and represented an appreciable amount of consumed biomass ([70%).Gastropods, amphipods, and chironomids were the most abundant invertebrate prey taxa and occurred in 29-34% of lesser scaup diets. Although relatively frequent, these taxa each contributed only 4-27% of the diet by weight. Percent dry mass of amphipods, a preferred prey by lesser scaup, was low (4%) indicating that amphipod availability may be reduced during spring migration. Analysis of fish diets showed that black bullhead Ameiurus melas and yellow perch Perca flavescens had the highest diet overlap with lesser scaup at 94% and 92%, respectively. Moreover, mean size of amphipods and chironomids found in fish diets were significantly larger than that consumed by lesser scaup. Our findings support the notion that amphipod use by spring-migrating lesser scaup has declined and that size-selective predation by fishes may influence prey availability for lesser scaup.

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“…However, the methodology restricts surveys to wetlands that are 1 ha or greater in size and relies on the fact that most of the waterfowl are on the water (Smith 1995 surveys vary according to survey date, species, group size, observer and observer position within the aircraft (Rumble and Flake 1982;Gabor et al 1995;Naugle et al 2000;Conroy et al 2008). Shorebirds are often present on tiny wetlands, and nest territories include, but are not restricted to these wetlands.…”

Section: Discussionmentioning

confidence: 99%

Aerial Surveys Do Not Reliably Survey Boreal-nesting Shorebirds

Elliott¹,

Smith

Johnston³

2010

Can Field Nat

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. 2010 Aerial surveys do not reliably survey boreal-nesting shorebirds. Canadian Field-Naturalist 124(2): 145-150.Aerial surveys have been used as a method for surveying boreal-nesting shorebirds, which breed in difficult-to-access terrain; however, the fraction of breeding birds observed from the air is unknown. We investigated rates of detection by conducting simultaneous air and ground surveys for shorebirds at three sites in the boreal forest of the Northwest Territories, Canada, in 2007. Helicopter surveys included both pond-based surveys where the helicopter flew around the perimeter of each wetland and transect-based surveys where observers recorded birds seen on line transects. Ground surveys involved intensive observation, territory mapping and nest searching in 5 km 2 of plots over a period of 5-6 weeks. Shorebird densities observed from the helicopter were highest near large bodies of water. No shorebirds were observed over closed forest despite breeding densities on ground surveys being highest in closed forest. Detection rates were very low, varied among species and aerial survey types, and were inconsistent over time. Ground-based observations showed that the shorebirds often did not flush in response to the helicopter passing overhead. Owing to poor rates of detection, we conclude that helicopter surveys are not an appropriate method for surveying breeding shorebirds in boreal habitats, but may have some utility for monitoring birds' use of stop-over locations.

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Temporal distribution of waterfowl in eastern South Dakota: Implications for aerial surveys

Cited by 20 publications

References 1 publication

Declining Scaup Populations: A Retrospective Analysis of Long-Term Population and Harvest Survey Data

Declining Scaup Populations: A Retrospective Analysis of Long-Term Population and Harvest Survey Data

Patterns of prey use by lesser scaup Aythya affinis (Aves) and diet overlap with fishes during spring migration

Aerial Surveys Do Not Reliably Survey Boreal-nesting Shorebirds

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