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13 results for “black duck”
Wood duck nest survival and duckling recruitment is minimally affected by interspecific brood parasitism from hooded mergansers and black-bellied whistling-ducks
<p>In the southeastern United States, wood ducks (<em>Aix sponsa</em>) have historically experienced interspecific brood parasitism (IBP) primarily from hooded mergansers (<em>Lophodytes cucullatus</em>), but the recent northward expansion of black-bellied whistling-ducks (<em>Dendrocygna autumnalis</em>) has added a new complexity to these interactions. We monitored nest boxes in Louisiana to evaluate the influence IBP had on wood duck daily nest survival rate (after, DSR) and duckling recruitment. We monitored 1,295 wood duck nests from 2020−2023 and found 112 (8.7%) were parasitized by hooded mergansers and 148 (11.5%) by whistling-ducks. Parasitic egg-laying by hooded mergansers lowered wood duck DSR, while DSR for nests parasitized by whistling-ducks was comparable to clutches containing only wood duck eggs. We considered the wood duck capture histories of 2,465 marked female ducklings and 540 banded adult females to estimate a duckling recruitment probability for the entire study period. We recaptured 50 ducklings as adults; 6 (12.0%) hatched from clutches parasitized by hooded mergansers, 1 (2.0%) from a clutch parasitized by a whistling-duck, and 43 (86.0%) from clutches containing only wood duck eggs. The duckling recruitment probability was 0.039 (95% credible interval = 0.028, 0.051). Nest initiation date had a negative effect on recruitment, wherein most recruits hatched from nests initiated earlier in the season. Given only ~9% of wood duck nests contained hooded merganser eggs, we conclude IBP writ large had no detrimental effect on DSR at a population level. The lower DSR of clutches parasitized by hooded mergansers is potentially linked to a high abundance of early-season parasites that produce "dump nests" and these clutches are often abandoned without being incubated. Despite ongoing parasitism by hooded mergansers and the range expansion of whistling-ducks, wood duck productivity in Louisiana appears to be minimally affected by interspecific brood parasitism.</p>
Wood duck nest survival and duckling recruitment is minimally affected by interspecific brood parasitism from hooded mergansers and black-bellied whistling-ducks
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Mallards have been replacing Black Ducks in human-altered landscapes in Ontario, 1996-2019
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Stable-isotopes (δ2H, δ13C) within feathers from harvested American black ducks (2017-2020)
<p>Stable isotope data from American Black Duck feathers (n = 665) and associated harvest data. The first primary feather (P1) was collected from wings submitted to the Species Composition Survey in Canada and Parts Collection Survey in the United States. From available feathers, we selected individuals for stable-isotope analysis stratified by black duck conservation region, sex, age, and date of harvest, where possible. These data are those that were selected for stable-hydrogen isotope analysis. See Kusack et al. (in press) - 'Origins of harvested American black ducks: stable isotopes support the flyover hypothesis' for additional information on our use of this data.</p>
Louisiana black-bellied whistling-duck clutch characteristics in the presence of conspecific and interspecific brood parasitism
<p>Black-bellied Whistling-Ducks (Dendrocygna autumnalis; hereafter Whistling-Duck) are undergoing a rapid range expansion northward and now breed throughout the southeastern United States. As a facultative cavity-nesting species, they have the potential to compete with Wood Ducks (Aix sponsa) and Hooded Mergansers (Lophodytes cucullatus) for nest sites. Little is known about Whistling-Duck breeding biology, and estimates of clutch characteristics and rates of conspecific and interspecific brood parasitism (hereafter, CBP and IBP respectively) are lacking. We monitored Whistling-Duck nests in Louisiana to describe nesting chronology, clutch size of parasitized and unparasitized (hereafter, normal) nests, and hatchability (i.e., the portion of eggs that hatched) for clutches of different sizes and types. We monitored a total of 558 nest boxes 2020–2021 and determined the presence of brood parasitism for 231 Whistling-Duck nests. CBP was detected in 73 (31.6%) nests, and IBP was observed in 51 (22.1%) nests parasitized by Wood Ducks, 2 (0.9%) nests parasitized by Hooded Mergansers, and 1 nest contained eggs from all three species. Normal clutches were smaller (15.4 ± 4.4 eggs) than CBP clutches (26.1 ± 8.8 eggs) and mixed clutches (22.2 ± 5.3 eggs; clutches containing Wood Duck or Hooded Merganser eggs; all pairwise P < 0.0001). However, within-clutch repeatability estimates for egg morphology data (i.e., length, width, and mass) were low (< 0.40) for normal clutches, suggesting CBP went undetected. Of 180 fated nests used to determine hatchability, 66 (36.7%) were successful, 49 (27.2%) were abandoned, 64 (35.6%) were depredated, and 1 (0.6%) was nonviable. Considering successful nests, hatchability was high for all clutch size bins ranging from 67.4% (41-45 eggs) to 81.6% (11-15 eggs). This study is the first to document Whistling-Ducks successfully hatching mixed-species broods, and such high productivity could be contributing to whistling-duck range expansion.</p>
Stable-isotopes (δ2H, δ13C) within feathers from harvested American black ducks (2017-2020)
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Louisiana black-bellied whistling-duck clutch characteristics in the presence of conspecific and interspecific brood parasitism
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American black duck PTT data from Atlantic Canada
<p><span>American black ducks, native to eastern North America, have been the focus of significant international conservation and management programs. The combined USA and Canadian population has traditionally been managed as a single population; however black duck demographics may vary by region. To help understand potential regional differences in black ducks, we used satellite telemetry to assess migratory chronology and movements of black ducks wintering near Windsor, Nova Scotia, Canada, near the northern limits of their wintering range where numbers are increasing. Wintering black ducks from Nova Scotia did not leave the Atlantic Flyway and included both longer-distance migrants (~ 1 500 km north) and locally-breeding individuals. None of our tracked ducks travelled south of Nova Scotia during any part of the annual cycle, indicating a population segment that never leaves Canada and is subject solely to Canadian harvest pressures. Band recovery data revealed that a small portion (2.4%) of black ducks originally banded during winter in Nova Scotia were recovered south along the east coast of the USA, indicating that some of these black ducks are subject to international harvest pressures. Our results show that there are differences in annual black duck movements even within a small part of their range, adding to the growing evidence that black duck populations show fine-scale temporal and spatial structure. This structure will need to be considered in future interprovincial and international harvest management plans of this important species.</span></p>
Pacific black ducks tri-axial accelerometer data with behaviour labels
<p>The tri-axial accelerometer datasets from Pacific black ducks (<em>Anas superciliosa</em>) was measured at 25 Hz. Fifty tri-axial measurements, totalling 2 seconds, were used to form a behaviour segment. Each dataset includes 9343 segments each forming a row in the dataset. Each row contains 151 columns. The first 150 columns are ACC measurements from three orthogonal axes, arranged as x, y, z, x, y, z, ...,x, y, z. The final column is of type character containing the corresponding behaviour. The two datasets contains 16 and 8 behaviour type labels, respectively. </p>
Data from: Idenitfying hybrids & the genomics of hybridization: mallards & American black ducks of Eastern North America
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American black duck PTT data from Atlantic Canada
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Pacific black ducks tri-axial accelerometer data with behaviour labels
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Identification and profiling of microRNAs associated with white and black plumage pigmentation in the white and black feather bulbs of ducks by RNA-Sequencing
GEO Series GSE69301. Anas platyrhynchos. 5 samples. Type: Non-coding RNA profiling by high throughput sequencing.
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