Mottled Duck (Anas fulvigula)

Bielefeld, Ronald R.; Brasher, Michael G.; Moorman, Thomas E.; Gray, Paul N.

doi:10.2173/bna.081

Cited by 9 publications

(7 citation statements)

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“…Hypothetically, condition and quality of wetlands, as affected by precipitation, influence mottled duck populations (Moorman and Gray 1994); populations declined during drought in Florida (Sincock 1957, Johnson 1986) and Texas (Stutzenbaker 1988). Moreover, these declines presumably resulted from lower recruitment.…”

Section: Discussionmentioning

confidence: 99%

“…The nonmigratory mottled duck (Anas fulvigula) inhabits peninsular Florida and the coastal marshes along the Gulf of Mexico from Alabama, USA, west and south to Tampico, Mexico (Moorman and Gray 1994). Mottled ducks in Florida, USA, however, are genetically distinct from those occurring in more western areas (McCracken et al 2001) and are managed as a separate population.…”

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confidence: 99%

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

Bielefeld

Cox

2006

Wildlife Society Bulletin

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An understanding of survival and underlying causes of mortality is essential to the development of effective management strategies for the mottled duck (Anas fulvigula) in Florida. From radiotelemetry data we estimated season‐specific survival rates for the entire annual cycle, cause‐specific mortality rates, and annual survival rates. We also tested for variation in survival in relation to year and period of the annual cycle. Our results suggest a strong temporal influence on survival of adult female mottled ducks, both within and among years. We found variation among years in the influence of various mortality agents, with alligators (Alligator mississippiensis), raptors, mammals, and human hunters being the principal mortality factors. Our results also suggest a link between surface water conditions within the Upper St. Johns River Basin (USJRB) and surrounding areas and survival. Agencies managing water and wildlife should be aware of this relationship and consider potential detrimental effects to mottled duck survival. (WILDLIFE SOCIETY BULLETIN 34(2):388–394; 2006)

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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

Bielefeld

Cox

2006

Wildlife Society Bulletin

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“…Periods of extended drought and extreme weather are likely to exacerbate factors affecting vital rates because of the mottled duck's sedentary life history, which limits dispersal from affected habitats (Stutzenbaker ). Additionally, global climate change poses substantial long‐term threats to coastal marsh habitats because the 2 most direct effects are land submergence through sea‐level rise and decreases in water quality (Day and Templet 2008, Moon ).…”

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confidence: 99%

“…Few data are currently available to estimate seasonal survival rates or cause‐specific mortality of adult females for the Texas Chenier Plain Region. Factors hypothesized to cause variation in survival include phenological period in the annual cycle (pairing, molting, breeding, and brooding), periods of hunting, body condition, and inter‐annual variation in precipitation, which can be captured within a year effect (Stutzenbaker , Wilson , Moon ). To improve our understanding of mottled duck survival, our objectives were to quantify survival across multiple periods based on the species biology and evaluate the relative influence of temporal variation and periods of disturbance on seasonal mottled duck survival rates.…”

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confidence: 99%

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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“…their range (Moorman and Gray 1994; Figure 1), as Figure 1. The mottled duck's range in Texas and in Louisiana is shaded.…”

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confidence: 71%

Regional differences and long-term trends in lead exposure in mottled ducks

Lobpries

Neaville

Ortego

et al. 2005

Wildlife Society Bulletin

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We compared lead shot ingestion rates and bone lead levels in mottled ducks (Anas fulvigula maculosa) for regional differences and evaluated 16 years of lead shot ingestion data for evidence of decline. Gizzards (n=6,850) of hunter‐killed mottled duck were collected from 1987–2002. The mean lead shot ingestion rate of mottled ducks from the Central Texas Coast and Upper Texas Coast was 7.32%±1.13% (SE) and 18.09%±1.55%, respectively. Lead shot ingestion rates declined gradually during the study period (P= 0.046). During the 1998–1999 hunting season, we examined lead concentrations in wing bones of 148 hunter‐killed mottled ducks from the Central Texas, Upper Texas, and Southwest Louisiana coastal regions. Lead concentrations averaged 16.62 ppm±1.83 (SE) and did not differ among regions or age groups. Both lead shot ingestion rates and bone lead concentrations in mottled ducks remain high. Studies evaluating the effects of lead levels on mottled duck survival are needed.

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Mottled Duck (Anas fulvigula)

Cited by 9 publications

References 0 publications

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

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

Seasonal survival of adult female mottled ducks

Regional differences and long-term trends in lead exposure in mottled ducks

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