Breeding Biology of Wood Ducks Using Natural Cavities in Southern Illinois

Ryan, Daniel C.; Kawula, Robert; Gates, Robert J.

doi:10.2307/3802269

Cited by 30 publications

(30 citation statements)

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“…We detected no annual variability in survival due to (catastrophic) environmental or anthropogenic impacts as has been observed in other bird species (e.g. Migoya & Baldassarre 1995, Cézilly et al 1996, Krementz et al 1997b, Ryan et al 1998.…”

Section: Discussionsupporting

confidence: 66%

Nesting area fidelity and survival of female Common Goldeneyes Bucephala clangula: are they density‐dependent?

Ludwichowski

Barker

Bräger³

2002

Ibis

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The breeding histories of 218 female Common Goldeneyes Bucephala clangula were recorded between 1971 and 2000 in a study area in Schleswig‐Holstein, northern Germany. Females were first recorded breeding at a median age of 2 years usually in their area of hatching (philopatry). One hundred and two of 140 females (73%) re‐nested only in one of the 13 nesting areas (clusters of nestboxes) for all their known life of up to 13 breeding seasons. The remaining 38 individuals moved between different nesting areas at least once between breeding attempts. The two oldest females were still breeding at a minimum age of 15 years (i.e. 13 years between first and last recorded breeding attempt). Temporal variations in annual survival rates of adult females could best be explained by a model with annual survival rate varying independently and randomly about a mean of 0.830 (se = ±0.023) with an estimated sd of ±0.092 (95% CI = 0.064, 0.138). No trend in the annual survival rate was detected over the study period of 30 years, although the presence of a moderate trend could not be ruled out. The absence of any discernible trend in survival at a time when the population size increased substantially indicates little, if any, density‐dependence in survival of female Goldeneyes during this study.

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Section: Discussionsupporting

confidence: 66%

Nesting area fidelity and survival of female Common Goldeneyes Bucephala clangula: are they density‐dependent?

Ludwichowski

Barker

Bräger³

2002

Ibis

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“…Effects of other attachment methods were reported in original tracking studies. Survival and (re) nesting of Wood Ducks carrying a radio transmitter on a bib, a piece of fabric hanging from the neck on the chest, were lower than expected based on earlier studies, which may be related to the transmitter attachment [74]. We are unaware of other experiences with waterfowl carrying bibs.…”

Section: Other Attachment Methodsmentioning

confidence: 46%

Reduction in adverse effects of tracking devices on waterfowl requires better measuring and reporting

Lameris

Kleyheeg

2017

Anim Biotelemetry

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Since the first studies in the mid-twentieth century, lightweight electronic tracking devices have been increasingly used to study waterfowl movements. With half a century of experience and growing sample sizes, it has become clear that the attachment of a tracking device can affect a bird's behaviour and fitness. This becomes problematic when it introduces uncertainty about whether the recorded data represent natural behaviour. Waterfowl may be particularly prone to tag effects, since many species are migratory and tracking devices can disrupt their waterproof plumage. The primary aim of this paper is to identify how tracking devices may affect waterfowl survival, migration and reproduction, and how better measuring and reporting of such effects can improve our understanding of the risks, providing a first step towards reducing their impact in future studies. We reviewed literature on electronic tracking of waterfowl to create an overview of currently recognized effects of harness-attached backpacks, implants, subcutaneous attachments and neck collars. Additionally, we analysed developments in the use of attachment methods, the weight of tracking devices relative to bird body mass, and the reporting rate of effects of tracking devices in 202 original tracking studies. We found that although the number of waterfowl tracking studies described in peer-reviewed literature has steeply increased over the past decades, reporting rates of potential effects have decreased from 65.0 to 26.5%. Meanwhile, the mean weight of the tracking devices relative to the bird's body mass remained stable around 2.0%. Major negative effects were reported in 17% of all studies and were found for all attachment methods. Overall, large differences exist in the occurrence and type of negative effects between species and studies, even if the same tracking methods were used. Inconsistent reporting of effects, lack of control groups to measure effects and incomplete descriptions of the methodology hamper the identification of factors contributing to these effects. To accomplish a reduction in adverse effects of tracking, it is necessary to improve the measuring and reporting of effects. We propose a framework for standardized reporting of methods in primary tracking studies and standardized protocols to measure effects of tracking devices on waterfowl.

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“…We located nests by climbing 63 trees reported to have Wood Duck nests from 1993 to 1998 (Ryan et al 1998, Zwicker 1999. We also used swim-in traps to capture hens and placed radio transmitters (Montgomery 1985) on 43 hens in 2001-02 according to animal-care protocols of the University of Missouri-St. Louis (W01-3) and Ohio State University (00A0001).…”

Section: Fieldmentioning

confidence: 99%