Using Hydrogen Isotope Geochemistry to Estimate the Natal Latitudes of Immature Cooper's Hawks Migrating Through the Florida Keys

Meehan, Timothy D.; Lott, Casey A.; Sharp, Zachary D.; Smith, Ruth B.; Rosenfield, Robert N.; Stewart, Andrew C.; Murphy, Regina M.

doi:10.1093/condor/103.1.11

Cited by 33 publications

(44 citation statements)

References 18 publications

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“…We detected an inverse relationship between latitude and dD at a relatively fine spatial scale in the upper Midwest, as was expected based on the similar larger scale trend in North America (Chamberlain et al 1997;Hobson and Wassenaar 1997;Meehan et al 2001Meehan et al , 2004. However, our dD values from South Dakota were substantially less depleted than those from other states and explained much of the latitudinal relationship.…”

Section: Discussionsupporting

confidence: 83%

Use of Stable Isotope Methodology to Determine Natal Origins of Mallards at a Fine Scale Within the Upper Midwest

Szymanski

Afton

Hobson³

2007

J Wildl Manag

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Waterfowl managers often attempt to protect local breeding stocks of mallards (Anas platyrhynchos) from hunting pressure, but presently they cannot identify natal origins of birds shot during fall hunting seasons with certainty, unless recovered birds are banded before fledging. Accordingly, we examined whether stable isotope methodology could accurately delineate natal origins of mallards at a fine scale within the upper Midwest (USA). We determined δ13C, δD, and δ15N values from feather samples of 102 flightless mallard ducklings collected in Minnesota, North Dakota, South Dakota, and Wisconsin, USA, from 7 July to 9 September 2002. We detected inverse relationships between latitude and δ13C(R2 = 0.223) and δD(R2 = 0.210). We also detected a weak positive relationship between easterly shifts in longitude and δ13C(R2 = 0.067) and a weak negative relationship between easterly shifts in longitude and δ15N(R2 = 0.076). The 13C and deuterium values differed (P < 0.02) among states: North Dakota was most depleted in 13C, and South Dakota was least depleted in deuterium. Discriminant function analysis delineated natal origins of mallard ducklings in Minnesota, North Dakota, South Dakota, and Wisconsin with low‐to‐moderate accuracy (47%), whereas we predicted natal origins of ducklings among subregions (Prairie [ND, SD] vs. Great Lakes [MN, WI] states) with moderate accuracy (72%). We conclude that stable isotope methodology has a limited ability to determine natal origins of migratory birds along a longitudinal corridor at fine scales but that it improves across ecoregions. However, the ability of deuterium to determine natal origins of migratory birds may vary as hydrological conditions, within and among areas, change throughout time. Researchers should account for annual variation in deuterium found in surface waters when investigating natal origins of migratory birds that use food derived primarily from these waters.

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Section: Discussionsupporting

confidence: 83%

Use of Stable Isotope Methodology to Determine Natal Origins of Mallards at a Fine Scale Within the Upper Midwest

Szymanski

Afton

Hobson³

2007

J Wildl Manag

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“…β = 0.68 to 1.0: [7], [14], [16], [20], [46]. A slope of less than one implies that large differences in δD GS values across the landscape will result in only small differences in δD F values.…”

Section: Discussionmentioning

confidence: 99%

Geographic Variation of Strontium and Hydrogen Isotopes in Avian Tissue: Implications for Tracking Migration and Dispersal

et al. 2009

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BackgroundIsotopes can provide unique solutions to fundamental problems related to the ecology and evolution of migration and dispersal because prior movements of individuals can theoretically be tracked from tissues collected from a single capture. However, there is still remarkably little information available about how and why isotopes vary in wild animal tissues, especially over large spatial scales.Methodology/Principal FindingsHere, we describe variation in both stable-hydrogen (δDF) and strontium (87Sr/86SrF) isotopic compositions in the feathers of a migratory songbird, the Tree Swallow (Tachycineta bicolor), across 18 sampling sites in North America and then examine potential mechanisms driving this variation. We found that δDF was correlated with latitude of the sampling site, whereas 87Sr/86SrF was correlated with longitude. δDF was related to δD of meteoric waters where molting occurred and 87Sr/86SrF was influenced primarily by the geology in the area where feathers were grown. Using simulation models, we then assessed the utility of combining both markers to estimate the origin of individuals. Using 13 geographic regions, we found that the number of individuals correctly assigned to their site of origin increased from less than 40% using either δD or 87Sr/86Sr alone to 74% using both isotopes.Conclusions/SignificanceOur results suggest that these isotopes have the potential to provide predictable and complementary markers for estimating long-distance animal movements. Combining isotopes influenced by different global-scale processes may allow researchers to link the population dynamics of animals across large geographic ranges.

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“…A similar concern over lack of population-level specificity has also begun to emerge in isotopic studies (Wunder et al, 2005). Several studies have reported that, using regression techniques based on H isotope ratios, assignment of individuals to any subset of the species' breeding range was unproductive (Kelly et al 2001, Meehan et al 2001). However, this isotopic marker has also been useful in uncovering the existence of previously unknown breeding populations (Hobson et al 2001.…”

Section: Introductionmentioning

confidence: 99%

Combining Isotopic and Genetic Markers to Identify Breeding Origins of Migrant Birds

Kelly

Ruegg

Smith

2005

Ecological Applications

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A quantitative method for linking reproductive and nonreproductive phases of migratory life cycles is fundamental to understanding the biology of migratory organisms. Here we combine genetic (mtDNA) and biochemical (stable isotope) information to examine seasonal movements in the Swainson's Thrush (Catharus ustulatus), a Neotropical migrant. We show that when these intrinsic markers are used in concert, they can predict the site‐specific origin of thrushes with 76–80% accuracy. Genetic and isotope data needed for these classifications can be obtained from migratory organisms at any phase of the life cycle. We demonstrate how this classification analysis can be used to infer breeding origins of samples gathered during the nonreproductive phases of the life cycle. Based on these results, we argue that further integration of methodologies will refine the scale at which linkages between reproductive and nonreproductive phases of the life cycle can be quantified.

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Using Hydrogen Isotope Geochemistry to Estimate the Natal Latitudes of Immature Cooper's Hawks Migrating Through the Florida Keys

Cited by 33 publications

References 18 publications

Use of Stable Isotope Methodology to Determine Natal Origins of Mallards at a Fine Scale Within the Upper Midwest

Use of Stable Isotope Methodology to Determine Natal Origins of Mallards at a Fine Scale Within the Upper Midwest

Geographic Variation of Strontium and Hydrogen Isotopes in Avian Tissue: Implications for Tracking Migration and Dispersal

Combining Isotopic and Genetic Markers to Identify Breeding Origins of Migrant Birds

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