Survival and Cause-Specific Mortality of Adult Female Mottled Ducks in East-Central Florida

Bielefeld, Ronald R.; Cox, Robert R.

doi:10.2193/0091-7648(2006)34[388:sacmoa]2.0.co;2

Cited by 16 publications

(40 citation statements)

References 15 publications

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“…Overall, our annual survival estimates are lower than any other previously estimated in Texas (Stutzenbaker ; Haukos ,; Rigby and Haukos ) or in Florida (Bielefeld and Cox , Varner et al ). However, estimated annual survival rates had 95% confidence intervals that overlapped estimates calculated using band‐recovery data (50.9%, 95% CI = 48.6–53.3; Haukos ).…”

Section: Discussioncontrasting

confidence: 85%

“…The most supported model included periods of harvest, with lowest seasonal survival during the general waterfowl season. Similarly, several studies have reported elevated mortality rates 1 August−30 December (Bielefeld and Cox , Wehland ). These dates coincide with molt, the general waterfowl season, and special seasons for other waterfowl (i.e., teal and wood duck [ Aix sponsa ]) that occur within the mottled duck range.…”

Section: Discussionmentioning

confidence: 74%

“…These dates coincide with molt, the general waterfowl season, and special seasons for other waterfowl (i.e., teal and wood duck [ Aix sponsa ]) that occur within the mottled duck range. Bielefeld and Cox () reported the post‐breeding and hunting season to be the most hazardous periods for mottled duck survival in east‐central Florida. Similarly, a conventional telemetry study in the WGC population from 2006−2010 documented that most mortalities occurred during periods of hunting (52%) and post‐breeding (25%; Wehland ), and reported lower rates of mortality for the breeding season (18%) and late winter (5%) periods (Wehland ).…”

Section: Discussionmentioning

confidence: 99%

“…Many previous studies link declines in waterfowl survival during periods of harvest, but none of the aforementioned studies documented declines in survival during which their focal species were not legal targets (Cox et al , Bielefeld and Cox , Péron et al , Wehland ). Seasonal survival was lower during the special teal season than during non‐hunted periods.…”

Section: Discussionmentioning

confidence: 99%

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Seasonal survival of adult female mottled ducks

2017

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The mottled duck (Anas fulgivula) is a non-migratory duck dependent on coastal habitats to meet all of its life cycle requirements in the Western Gulf Coast (WGC) of Texas and Louisiana, USA. This population of mottled ducks has experienced a moderate decline during the past 2 decades. Adult survival has been identified as an important factor influencing population demography. Previous work based on band-recovery data has provided only annual estimates of survival. We assessed seasonal patterns of female mottled duck survival from 2009 to 2012 using individuals marked with satellite platform transmitter terminals (PTTs). We used temperature and movement sensors within each PTT to indicate potential mortality events. We estimated cumulative weekly survival and ranked factors influential in patterns of mortality using known-fate modeling in Program MARK. Models included 4 predictors: week; hunting and non-hunting periods; biological periods defined as breeding, brooding, molt, and pairing; and mass at time of capture. Models containing hunt periods, during and outside the mottled duck season, comprised essentially 100% of model weights where both legal and illegal harvest had a negative influence on mottled duck survival. Survival rates were low during 2009-2011 (12-38% annual rate of survival), when compared with the long-term banding average of 53% annual survival. During 2011, survival of female mottled ducks was the lowest annual rate (12%) ever documented and coincided with extreme drought. Management actions maximizing the availability of wetlands and associated upland habitats during hunting seasons and drought conditions may increase adult female mottled duck survival. Ó

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Section: Discussioncontrasting

confidence: 85%

Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Seasonal survival of adult female mottled ducks

2017

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“…High rates of site fidelity also have been found in harlequin ducks ( Histrionicus histrionicus ; Iverson and Esler ) and urban Canada geese ( Branta canadensis ; Groepper et al , Balkcom ). Bielefeld and Cox (), however, reported that 20–56% of female mottled ducks captured in rural areas of the Upper St. Johns River Basin in east‐central Florida moved to urban habitats in response to reduced wetland habitat availability in rural areas during a prolonged drought. Use of atypical habitats by ducks is sometimes correlated with decreased availability of wetland habitats (Derksen and Eldridge , Giroux ).…”

Section: Discussionmentioning

confidence: 99%

Movements and seasonal use of habitats by rural and urban female mottled ducks in southeast Florida

2014

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Florida will continue to undergo high rates of habitat loss, primarily the result of urbanization. In addition, invasive species are a major threat to Florida's biodiversity. The Florida mottled duck (Anas fulvigula), a bird unique to the state, is particularly vulnerable to loss of wetland habitats and hybridization with feral mallards. Because mottled ducks are more likely to encounter feral mallards in urban habitats, we trapped and radiomarked adult females in urban (n = 99) and rural (n = 146) habitats to estimate home ranges and rates of movement into and out of urban areas. We also determined habitat use in urban and rural areas during the breeding (1 Feb–31 Jul), post‐breeding (1 Aug–18 Nov), and hunting (19 Nov–31 Jan) periods and estimated seasonal habitat selection of rural female mottled ducks. Urban females used mostly aquatic habitats in low and high intensity human development year‐round. Rural ducks used freshwater marshes throughout the year, but selection of other habitat types varied seasonally. Use of glades marsh and agricultural habitats by rural ducks peaked during the breeding season. Rural ducks selected artificial impoundments and reservoirs during the post‐breeding and hunting periods. Median home range size of rural females was more than 65 times greater than those of urban females. Our results suggest the spread of mallard genetic introgression caused by females leaving urban areas may be slow because as few as 6% of the adult females moved between urban and rural areas. Focusing wetland conservation efforts on freshwater marshes and artificial impoundments in south Florida would likely benefit mottled ducks. © 2014 The Wildlife Society.

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Mottled Duck introductions to South Carolina: The ugly, the bad, and the good?

Davis

2022

Ecology and Evolution

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Translocations or other movements of wildlife sometimes accomplish their intended objectives, but unforeseen consequences may arise and disrupt locally adapted ecological communities, restructure or dilute genetic integrity of populations or subspecies of the moved organism, and otherwise negatively influences a species’ long‐term fitness. Two historical populations of Mottled Ducks ( Anas fulvigula ) exist and are endemic to (1) Mexico and the West‐Gulf Coast ( A . f . maculosa ) regions of the United States and (2) Florida ( A . f . fulvigula ). From 1975 to 1983, 1285 Mottled Ducks from Florida, Louisiana, and Texas were released to coastal South Carolina, primarily to ultimately establish a legally harvestable population. This movement stirred mixed reactions amid the conservation community. Contemporary information suggests an increasing Mottled Duck population in South Carolina and possibly dispersing into Georgia. Herein, I objectively discuss the potential consequences of this new population per the birds’ evolution, ecology, and management. Ultimately, I suggest that this translocation is a long‐term benefit to the species.

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Survival and Cause-Specific Mortality of Adult Female Mottled Ducks in East-Central Florida

Cited by 16 publications

References 15 publications

Seasonal survival of adult female mottled ducks

Seasonal survival of adult female mottled ducks

Movements and seasonal use of habitats by rural and urban female mottled ducks in southeast Florida

Mottled Duck introductions to South Carolina: The ugly, the bad, and the good?

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