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2018 Southeastern Naturalist Notes Vol. 17, No. 3
J.R. Marty, S.A. Collins, and J.M. Whitaker
Extralimital Records of Louisiana-Banded Mottled Ducks
Recovered in North Dakota
Joseph R. Marty1,*, Samantha A. Collins1, and James M. Whitaker1
Abstract - Anas fulvigula (Mottled Duck) is a non-migratory year-round resident species of the
western Gulf Coast and peninsular Florida. We report on 2 male Mottled Ducks banded in southwest
Louisiana and harvested in south central North Dakoa, having traveled a minimum of 1991 km. It is
unknown whether these birds paired with migratory female A. platyrhynchos (Mallard) during fall–
winter 2016 and subsequently followed them to a breeding area in North Dakota, or whether these
birds themselves may have been hybrid offspring of such a pairing. Previous extralimital records of
Mottled Ducks have been reported in the Prairie Pothole region, but our data represent the northernmost
records for this species. Increasing extralimital reports of Mottled Ducks or hybrid ducks should
be cause for concern among conservation planners. Additional research into Western Gulf Coast
Mottled Duck genetics and hybridization rates is warranted.
Anas fulvigula Ridgway (Mottled Duck) is a non-migratory waterfowl species endemic
to the western Gulf Coast and peninsular Florida (Fig 1; Baldassarre 2014, Stutzenbaker
1988, Wilson 2007). Genetic analyses and band-recovery data indicate 2 genetically and
geographically distinct subspecies, A. fulvigula fulvigula Ridgway (Florida Mottled Duck)
and the A. f. maculosa Sennett (Western Gulf Coast Mottled Duck) (McCracken et al.
2001). Additionally, a small but expanding population of Mottled Ducks resides in South
Carolina as a result of a coordinated release of Texas, Louisiana, and Florida birds during
1975–1983 (Kneece 2016). The western Gulf Coast and South Carolina populations inhabit
coastal marshes, inland coastal prairies, and inland agricultural lands (e.g., production
and fallow rice fields), whereas the Florida population inhabits freshwater wetlands and
marshes, ponds, and ditches throughout the Florida peninsula (Baldassarre 2014, Bielefeld
et al. 2010). Few records of western Gulf Coast Mottled Ducks have occurred outside of
the coastal marsh and prairie regions of Louisiana and Texas, which often extend 80–160
km inland from the coastline (Selman et al. 2011, Stutzenbaker 1988). Previous confirmed
band-return records have occurred as far inland as Iowa, Indiana, and South Dakota for the
western Gulf Coast population and as far north as New Jersey from the Florida population
(Baldassarre 2014, Dinsmore and Brees 2007).
Recent studies and mid-winter aerial survey data indicate the Gulf Coast Mottled Duck
population is experiencing declines (Moon 2014; Louisiana Department of Wildlife and
Fisheries, Baton Rouge, LA, unpubl. data). The Mottled Duck is classified as a species of
greatest conservation need in Louisiana (S4; Holcomb et al. 2015) and Texas Wildlife Action
Plans (Texas Parks and Wildlife Department 2012), and has been identified as a priority
species for the US Fish and Wildlife Service, Gulf Coast Joint Venture, and the Gulf Coast
Prairies Landscape Conservation Cooperative. Anthropogenic changes, including loss and
degradation of coastal wetlands and adjacent prairies are likely responsible for historical
and recent declines in Mottled Duck populations. Rockefeller Wildlife Refuge (RWR)
supports research to help scientists and managers better understand Mottled Duck ecology
and population dynamics. Since 1994, Louisiana Department of Wildlife and Fisheries
1Rockefeller Wildlife Refuge, Louisiana Department of Wildlife and Fisheries, 5476 Grand Chenier
Hwy, Grand Chenier, LA 70643. *Corresponding author - jmarty@wlf.la.gov.
Manuscript Editor: Karl E. Miller
Notes of the Southeastern Naturalist, Issue 17/3, 2018
2018 Southeastern Naturalist Notes Vol. 17, No. 3
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J.R. Marty, S.A. Collins, and J.M. Whitaker
staff at RWR have banded over 40,000 Mottled Ducks, primarily in the coastal marshes
of southwestern Louisiana. Banding occurs during brood rearing and molt, primarily from
June–August (Baldassarre 2014). Birds are captured at night using spotlights and airboats.
Band-recovery data assists conservation planners in deriving estimates on annual survival
and harvest rates of Mottled Ducks. Banding efforts primarily occurred within the Louisiana
parishes of Cameron and Vermilion, including RWR, the southwestern Louisiana National
Wildlife Refuge Complex (Sabine and Cameron Prairie), and on private property north of
RWR. Herein, we report on 2 band-recovery records of Mottled Ducks banded in Cameron
Parish, LA, and recovered in Stutsman and Logan counties, ND.
On 30 September 2017, a waterfowl hunter harvested a Mottled Duck ~1 km north/
northeast of Medina, ND (Stutsman County; 46.934388°N, 99.294962°W; Fig. 1). The bird
decoyed into a harvested wheat field with ~15–20 A. platyrhynchos L. (Mallard) and appeared
to be in excellent health with no abnormalities when inspected in hand (K.J. Lines,
Minnesota Department of Natural Resources, St. Paul, MN, pers. comm.). The hunter
Figure 1. Approximate range of Anas fulvigula (Mottled Duck) along the Gulf of Mexico and peninsular
Florida (striped), Rockefeller Wildlife Refuge (black circle); previous extralimital Mottled Duck
recovery record near Alpena, SD (black cross; Selman et al. 2011); and the recovery locations of 2
male Mottled Ducks near Medina and Gackle, ND (black star).
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2018 Southeastern Naturalist Notes Vol. 17, No. 3
J.R. Marty, S.A. Collins, and J.M. Whitaker
reported the band (1697-16393) to the US Geological Survey Bird Banding Lab (USGS
BBL), which indicated the harvested bird was an adult male hatched in 2015 or earlier. The
banding location of the Mottled Duck on 09 August 2016 was Unit 3 of RWR, a 1584-ha
brackish marsh impoundment that is gravity-drained and controlled for estuarine management.
The primary management goals for Unit 3 consist of providing wintering waterfowl
habitat (e.g., water depths of 15–30 cm) and food resources through maintenance of intermediate/
brackish marsh communities and conditions favorable to submerged aquatic and
annual emergent vegetation. Typical vegetative communities on that site include annuals
such as Echniochloa walteri (Pursh) A. Heller (Walter’s millet), Leptochloa fusca (L.)
Kunth (Mangle Sprangletop), Eleocharis spp. (spikerush), and Cyperus spp. (flatsedge), as
well as aquatics such as Najas guadalupensis (Spreng.) Magnus (Southern Naiad), Ruppia
maritima L. (Widgeongrass), and Potamogeton pusillus L. (Small Pondweed).
On 26 October 2017, a waterfowl hunter harvested a Mottled Duck from a pothole in a
harvested bean field ~8 km south of Gackle, ND (Logan County). The bird decoyed with
~6 Mallards and appeared to be in excellent health when inspected in hand (K. Roberson
[hunter and harvester of the bird], Gackle, ND, pers. comm.). The hunter reported the band
(1697-16982) to the USGS BBL. The bird was an adult male hatched in 2012 or earlier.
The banding location of the Mottled Duck on 5 August 2013 was in the Big Burns Marsh,
~24 km northwest of RWR, a freshwater marsh dominated by Spartina patens (Aiton)
Muhl (Saltmeadow Cordgrass) and Panicum hemitomon Schult. (Maidencane) and drained
through the Mermentau River Basin.
The Mottled Ducks traveled a minimum straight-line distance of 1991 km (1237 mi)
between their banding locations in SW Louisiana and harvest locations in North Dakota.
Mixed flocks of Mallards and Mottled Ducks often are seen in coastal marshes of Louisiana
and Texas, and it is common for the 2 species to hybridize (Ford et al. 2017, McCracken et
al. 2001). Conceivably, these male Mottled Ducks may have paired with migratory female
Mallards during fall–winter 2016 and followed them to a breeding area in North Dakota.
Because photos and genetic analyses are not available, it is also possible that the 2 birds
harvested in North Dakota may have been hybrids, causing them to behave differently
than Mottled Ducks. Selman et al. (2011) reported a female Mottled Duck banded at RWR
harvested in South Dakota, which at the time represented the longest recorded movement
for the species (1680 km [1040 mi]). Selman et al. (2011) also noted a number of Mottled
Ducks reported in Wisconsin and North Dakota during the 1970s, but those records had not
been confirmed. Therefore, we believe our records from North Dakota are the northernmost
encounters for Mottled Ducks (311 km [193 mi] farther than that reported in Selman et al.
[2011]). Our findings support the hypothesis that extralimital repor ts of Mottled Ducks are
increasing in the Prairie Pothole Region (Dinsmore and Silock 2004, Selman et al. 2011).
Over the past century, natural and anthropogenic events (e.g., oil spills, hurricanes,
tropical storms, oil/gas exploration, agriculture) have forever altered the coastal prairie and
marsh ecosystems of Louisiana (Couvillion et al. 2011, Dahl 2011). Furthermore, climate
change and sea-level rise will continue to affect precipitation patterns, droughts, flushing
times, and salinity of coastal habitats (Ning et al. 2003). It is plausible that a reduction in
suitable habitat coupled with a declining population may make it more difficult for Mottled
Ducks to secure mates and increase the likelihood of hybridization. We concur with Ford et
al. (2017) and suggest that protecting and restoring coastal marsh habitat may help reduce
future hybridization rates. The Coastal Protection and Restoration Authority of Louisiana
has developed a Coastal Master Plan that outlines restoration measures to slow coastal erosion
(Coastal Protection and Restoration Authority of Louisiana 2012). These restoration
2018 Southeastern Naturalist Notes Vol. 17, No. 3
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J.R. Marty, S.A. Collins, and J.M. Whitaker
measures, although untested, may improve the long-term outlook for Mottled Duck habitat
in Louisiana. Because Mottled Ducks and Mallards both use freshwater marsh habitats
during the non-breeding period of the annual cycle, they likely have a long history of hybridization.
Recent research has indicated that hybridization rates may be as high as 9%
and 8% among the Florida and Western Gulf Coast Mottled Duck populations, respectively
(Ford et al. 2017, Williams et al. 2005). Increasing extralimital reports of Western Gulf
Coast Mottled Ducks or hybrid ducks (Mottled Duck x Mallard) should be cause for concern
among conservation planners. Continued research into Mottled Duck genetics and acceptable
hybridization rates is warranted.
Acknowledgments. We thank Tate Lines and Kyle Roberson for reporting the harvest of the banded
Mottled Ducks to the USGS BBL and for providing information pertaining to the harvest. We also
thank Willy Lines, Kevin Lines, Steve Merchant, Steve Cordts, and Larry Reynolds for notifying us,
and providing information on this record. We thank Ruth M. Elsey and 2 anonymous reviewers for
providing helpful comments that greatly improved this manuscript. Last, we greatly appreciate the effort
from all RWR staff who worked long hours and many nights to capture and band Mottled Ducks.
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